Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Benzene, toluene, ethylbenzene and xylene (BTEX) are a challenging group of volatile organic compounds in industrial and energy areas. Since these aromatics may cause serious diseases such as cancer and respiratory illnesses, they must be... more
Benzene, toluene, ethylbenzene and xylene (BTEX) are a challenging group of volatile organic compounds in industrial and energy areas. Since these aromatics may cause serious diseases such as cancer and respiratory illnesses, they must be monitored. Pars Special Economic Energy Zone (PSEEZ) in Iran is the second largest energy zone of the world with numerous gas refineries and petrochemical complexes for producing a wide range of products. This study is focused on determination of BTEX concentration in the whole South Pars area (46 sampling points) which is the active site of PSEEZ using passive sampling. Then, the results of the passive sampling are used for providing spatial distribution of BTEX using GIS. The annual BTEX measurements revealed that benzene and toluene concentration violates the maximum permitted values at numerous points most of which are located in the vicinity of petrochemical complexes. Active sampling in these complexes not only confirms the results of passive sampling, but also suggests a more intensified BTEX pollution in the air quality of the area which reaches as high as 3500 μg.m −3 and 18,000 μg.m −3 for benzene and toluene, respectively, being far beyond the acceptable standards. Health risk analysis also confirms the intensity of BTEX at the selected points. This study suggests a reconsideration of the location of non-operational sites and personnel who are more vulnerable to BTEX contamination. Also, BTEX profile provided by GIS in this research gives a suitable plan for relocating.
Research Interests:
The current work is documented as the first record of the characteristics, removal efficiency, partitioning behavior, fate, and eco-toxicological effects of paraben congeners in a municipal wastewater treatment plant (WWTP, stabilization... more
The current work is documented as the first record of the characteristics, removal efficiency, partitioning behavior, fate, and eco-toxicological effects of paraben congeners in a municipal wastewater treatment plant (WWTP, stabilization ponds) and hospital WWTPs (septic tank and activated sludge), as well as seawater-sediments collected from runoff estuarine stations (RES) and coastal stations (CS) of the north of the Persian Gulf. The median values of Σparabens at the raw wastewater and effluent of the studied WWTPs were 1884 ng/L and 468 ng/L, respectively. The activated sludge system had a greater removal efficiency (56.10%) in removing ∑parabens than the septic tank (45.05%) and stabilization pond (35.54%). The discharge rates of methyl paraben (MeP) was computed to be 2.23, 21.18, and 9.12 g/d/1000 people for stabilization ponds, septic tank, and activated sludge, respectively. Median concentrations of Σparabens in seawater (103.42 ng/L) and sediments (322.05 ng/g dw) from RES stations were significantly larger than from CS stations (61.2 and 262.0 ng/g dw in seawater and sediments, respectively) (P < 0.05). The median of field-based koc for Σparabens was 130.81 cm3/g in RES stations and 189.51 cm3/g in CS stations. It was observed that the concentration of parabens could have negative impacts on some living aquatic populations (invertebrates and bacteria), but the risk was not significant for fishes and algae.
Research Interests:
Abstract We evaluated the concentration of copper (Cu), zinc (Zn), mercury (Hg), nickel (Ni), chromium (Cr), vanadium (V), and cobalt (Co) in the mangrove tissues (leaf and root) and adjusted sediments, as well as seawater samples in the... more
Abstract We evaluated the concentration of copper (Cu), zinc (Zn), mercury (Hg), nickel (Ni), chromium (Cr), vanadium (V), and cobalt (Co) in the mangrove tissues (leaf and root) and adjusted sediments, as well as seawater samples in the north coast of the Persian Gulf from three counties (Mahshahr, Bord Khun, Asaluyeh). Assaluyeh and Mahshahr were selected because of their proximity to the oil and petrochemical industries and Bord Khun was considered for being away from pollution sources. The metal detected in highest concentration in mangrove leaves and roots was Cu (Asaluyeh: 1.507 μg/g and 1.198 μg/g, Bord Khun: 1.812 and 1.756 μg/g, and Mahshahr: 0.880 and 1.617 μg/g, for leaves and roots, respectively). For sediments, Cr (among the metals) had the highest concentration (1.325 μg/g) in Asaluyeh, whereas in Bord Khun and Mahshahr Ni was predominant: 2.542 and 2.237 μg/g, respectively. For seawater, Cu was the most abundant metal and Hg was the one with the lowest concentration. The bio-concentration factor for Zn and Cu revealed that mangroves in the study areas have suitable potential for phytoremediation of these two metals. Translocation factors from the roots to leaves also indicated higher transportability for Zn and Cu through the plant tissues, compared to the other metals. Ecological indexes quantified the contamination of sediments and revealed a low level of heavy metal accumulation in sediments of the north of the Persian Gulf. Human risk hazards appeared low in all the areas under study. Gas and petrochemical activities can be considered as a potential source of the discharge of heavy metals into the aquatic environment.
Research Interests:
Disposal sludges from shipping docks contain elements that have the potential to catalyze the desired treatment process. The current work was designed to decompose phenol from wastewater by activation peroxymonosulfate (PMS) using a... more
Disposal sludges from shipping docks contain elements that have the potential to catalyze the desired treatment process. The current work was designed to decompose phenol from wastewater by activation peroxymonosulfate (PMS) using a catalyst made from sea sediments (at 400 °C for 3 h). The catalyst had a crystalline form and contained metal oxides. The parameters of pH (3-9), catalyst dose (0-80 mg/L), phenol concentration (50-250 mg/L), and PMS dose (0-250 mg/L) were tested to specify the favorable phenol removal. The phenol removal of 99% in the waste sludge catalyst/PMS system was achieved at pH 5, catalyst quantity of 30 mg/L, phenol content of 50 mg/L, PMS dose of 150 mg/L, and reaction time of 150 min. From the results, it was implied that the pH factor was more important in removing phenol with the studied system than other factors. By-products and phenol decomposition pathways were also provided. The results showed that the sea sediment catalyst/PMS system is a vital alternative for removing phenol from wastewater medium.
Research Interests: Chemistry, Catalysis, Decomposition, Medicine, Multidisciplinary, and 3 moreWastewater, Phenol, and Persulfate
The landfill leachate is a highly contaminated matrix containing large amounts of organic and inorganic substances that require effective treatment methods.This study was aimed to evaluate the effi...
Research Interests: Environmental Science, Chemistry, Analytical Chemistry, Phytoremediation, Waste Management, and 9 moreEnvironmental Chemistry, Environmental Analytical Chemistry, Electrokinetic Phenomena, Leachate, Chemical Oxygen Demand, Biochemical Oxygen Demand, Total suspended solids., Kjeldahl Method, and ENVIRONMENTAL SCIENCE AND MANAGEMENT
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Parabens are a group of chemical additive extensively utilized in various health care products and ubiquitously observed in the different environmental matrixes. Nevertheless, the exposure of women working in beauty salons to these... more
Parabens are a group of chemical additive extensively utilized in various health care products and ubiquitously observed in the different environmental matrixes. Nevertheless, the exposure of women working in beauty salons to these pollutants is not well-documented. For this purpose, 50.00 women working in beauty salons were chosen as the exposed group (EG) and 35.00 housewives were chosen as the control group (GC). The concentration of methyl paraben (MeP), ethyl paraben (EtP), butyl paraben (BuP), propyl paraben (PrP), benzyl paraben (BzP), heptyl paraben (HepP), and para-hydroxybenzoic acid (4-HB) metabolite were quantified in the collected urine samples. It was seen that paraben sexist with a high detection frequency (DF) in the urine of women working in beauty salons. The results also revealed that the significant difference between the urinary parabens level in the EG and CG (P value < 0.05). The median concentration of Σparaben and HB-4 metabolite in the before exposure (BE) samples was 124.00 and 219.00 μg/L, while in the after exposure (AE) samples, it was 156.00 and 249.00 μg/L, respectively. Moreover, the parabens levels in the AE samples were considerably higher than in BE samples in women working in beauty salons (P value < 0.05). This research also documented that "personal care products (PCPs) usage" can be known as a leading factor for the urinary paraben level in the studied individuals. The median total estimated daily intakes (TEsDI) for MeP, EtP, and PrP for the studied women were obtained as 8.02, 4.57, and 7.88 μg/L respectively. Also, a significant and positive association was observed between EtP, PrP as well as BuP and 8-OhdG (as a DNA oxidative stress biomarker) (P value < 0.01). Further, a significant and positive association was found between EtP as well as BuP and some biomarkers of kidney damage (like uTIMP-1 and uKim-1). Accordingly, it can be stated that women working in beauty salons are at a high risk in terms of DNA oxidative stress and kidney damage.
Research Interests:
Severalchemicalshavebeenappliedintheprocessofcoagulantextractionfromherbalseeds,andthebest extractionhasbeenobtainedinthepresenceofKClorNaNO3 [1–3], andNaCl [4]. However,themainchallenge posed... more
Severalchemicalshavebeenappliedintheprocessofcoagulantextractionfromherbalseeds,andthebest extractionhasbeenobtainedinthepresenceofKClorNaNO3 [1–3], andNaCl [4]. However,themainchallenge posed tothesemethodsofcoagulantextractionistheirrelativelylowefficiency forwatertreatmentpurposesand the formationofdissolvedorganicmatterduringthetreatmentprocess.Inthesemethodsthesalts,whichhavea one-valancemetal(Na+ and K+), aredepositedintheinternalstructureandtheporeofthecoagulant,andmaybe useful forthecoagulation/flocculation process.Inthisresearch,wefoundthatmodified methodsproducedmore dense protein.Therefore,themodified procedurewasbetterthantheolderoneforremovalofturbidityand harness fromthecontaminatedwater.Herewedescribeamethodwhere: � AccordingtotheHardy–Schulze rule,weappliedtheFe3+ ions insteadofNa+ and K+ for theextractionofprotein from Plantago ovata seeds. � The methodwasnarrowedtoextractproteinbyethanol(defatting)andammoniumacetateandCM-Sepharose (proteinextraction). � Two consecu...
Research Interests:
Background and Objectives: Furfural is one of the toxic chemical compounds used in many industries such as petrochemical, food, paper products, pharmaceutical, etc., due to having some characteristics. Therefore, furfural could be found... more
Background and Objectives: Furfural is one of the toxic chemical compounds used in many industries such as petrochemical, food, paper products, pharmaceutical, etc., due to having some characteristics. Therefore, furfural could be found at different concentrations in the effluent from these industries and can enter the environment. Hence, the aim of this study was the assessment the efficiency of a low cost bentonite modified with cationic surfactant in the removal of furfural from aqueous solution. Material and Methods: In this experimental study, bentonite was purchased from one of the Mines of Zanjan Province, Iran and then the efficiency of bentonite modified with the cationic surfactant CTAB (CTAB-Bent) was assessed in the adsorption of furfural from aqueous solution. Activated carbon (AC) was also purchased as commercial grade. Results: Under optimum conditions, the removal efficiency of AC and CTAB-Bent was about 52 and 66%, respectively. For both adsorbents used in this stud...
Research Interests:
Oral and dentistry (O&D) services processes may lead to exposing of personnel and patients with several microorganisms and arising of health problems. This cross-sectional study was investigated the bacteriological quality of dental unit... more
Oral and dentistry (O&D) services processes may lead to exposing of personnel and patients with several microorganisms and arising of health problems. This cross-sectional study was investigated the bacteriological quality of dental unit waterlines (DUWLs) in one of the O&D center in Tehran, Iran. One hundred ninety two samples were collected and examined based on standard microbiological procedures for determining and enumeration of heterotrophic plate count (HPC), Staphylococcus aureus and Pseudomonas aeruginosa. Data were analyzed by t-test, analysis of variance (ANOVA), Kruskal-Wallis and LSD tests with SPSS software (Ver.16). The results revealed that 70% of water samples (126 samples) had a high density of contaminations that higher than recommended values for DUWLs quality. The mean of bacterial density on Saturday was more than Wednesday and was 1838 CFU/ml, 739 CFU/ml and 11 CFU/ml for HPC, P. aeruginosa, and S.aureuse respectively. The LSD test implied that the mean of bac...
Research Interests:
Sharp and cutting objects injuries are a major occupational hazard for healthcare workers, particularly nurses. Sharp and cutting objects expose nurses to dangerous viruses such as all types of hepatitis and HIV. The purpose of this study... more
Sharp and cutting objects injuries are a major occupational hazard for healthcare workers, particularly nurses. Sharp and cutting objects expose nurses to dangerous viruses such as all types of hepatitis and HIV. The purpose of this study was to investigate injuries of hospital sharp and cutting wastes in nursing staff in Bushehr hospitals in 1392. Material & Methods: This cross- sectional study was conducted among 68 nurses in Bushehr hospitals. Data collection was carried out by visiting the nurses in hospitals, and the questionnaires were answered by nurses from various sections of hospitals. Furthermore, sharp injury cases were reported and archived by each hospital from 1389 to 1392. Correlations between sharp injuries and parameters related to these events were investigated. Data were analyzed using the SPSS software version 19. Results: The results of study showed that 58.8% of nurses had experienced sharp and cutting objects injuries. All of the nurses (100%) had been vaccin...
Research Interests:
Research Interests:
A magnetically recoverable polydopamine (PDA)-modified hydroxyapatite (HAp)/Fe3O4 magnetic composite (HAp/Fe3O4/PDA) was synthesized to exploit its adsorption capacity to remove Zn2+ from aqueous solution and the structural properties... more
A magnetically recoverable polydopamine (PDA)-modified hydroxyapatite (HAp)/Fe3O4 magnetic composite (HAp/Fe3O4/PDA) was synthesized to exploit its adsorption capacity to remove Zn2+ from aqueous solution and the structural properties were examined.
Research Interests:
The current work was conducted to study the concentrations of heavy metals (HMs) in farming soil and wheat and compute their geological and health indexes, including geo-accumulation index (Igeo), chronic daily intake (CDI), hazard index... more
The current work was conducted to study the concentrations of heavy metals (HMs) in farming soil and wheat and compute their geological and health indexes, including geo-accumulation index (Igeo), chronic daily intake (CDI), hazard index (HI), hazard quotient (HQ), and cancer risk (CR). In general, 256 samples were collected from agriculture soil (AS) and wheat in Kalaleh and Aq Qala areas, northern Iran. The average rates of Cd, Cu, Pb, and Zn were detected to be 0.28, 25.24, 15.44, and 60.33 mg·kg−1, respectively, for AS and 0.01, 8.85, 0.73, and 33.81 mg·kg−1 for wheat, respectively. Based on the results, the HQ and HI levels for investigated HMs were lower than l. So, the health risk of HMs exposure for adults and children was low. CR levels for Pb in AS for both children and adults were observed greater than the threshold value. Accordingly, lead-contaminated soil will be carcinogenic if ingested by children. On the other hand, the exposure to Pb (through wheat) and Cd (through both soil and wheat) had the acceptable CR level for all groups. As a result, for an extended period, there are no significant health consequences for children and adults.
Research Interests:
Abstract Resilience engineering (RE) has recently emerged as a novel safety management paradigm in socio-technical organizations. It is believed that RE is more compatible with the characteristics of complex socio-technical systems. The... more
Abstract Resilience engineering (RE) has recently emerged as a novel safety management paradigm in socio-technical organizations. It is believed that RE is more compatible with the characteristics of complex socio-technical systems. The multicriteria nature and the presence of both qualitative and quantitative latent factors make RE substantially more complex especially in quantifying and modeling aspects. To address this issue, the present research aims to develop a fuzzy hybrid multicriteria decision-making (MCDM) model for quantifying and evaluating resilience using the fuzzy Analytic hierarchy process (F-AHP) and fuzzy VIKOR (F-VIKOR) techniques. Initially, an evaluation framework including six resilience indicators and 43 sub-indicators was established. Afterward, the F-AHP method was used to determine the weight of the resilience indicators, while the F-VIKOR method was employed to rank the resilience performance of the different operational units. To present the model capability, we evaluated the resilience of a gas refinery as a typical instance of socio-technical systems. The findings revealed the performance level of resilience indicators in all units of the studied refinery and their ranking based on the computation of the index value (Qi). With respect to the Qi values, the best and worst performance of units from the resilience perspective was specified. Results indicate that the proposed model can serve as an effective evaluation approach in complicated systems and can be used to effectively design strategies to improve system safety performance. To the best of our knowledge, this is the first study that evaluates the resilience using the VIKOR and AHP in a fuzzy environment in the process industry.
Research Interests:
Abstract A new heterogeneous biochar/CaO/K2CO3 catalyst was fabricated to produce biodiesel from waste edible oil. In this catalyst, the biochar was produced from brown algae of Sargassum oligocystum and CaO from eggshells. The XRD result... more
Abstract A new heterogeneous biochar/CaO/K2CO3 catalyst was fabricated to produce biodiesel from waste edible oil. In this catalyst, the biochar was produced from brown algae of Sargassum oligocystum and CaO from eggshells. The XRD result showed that the biochar, CaO, and synthesized catalyst have a crystalline structure. Response surface methodology-central composite design (RSM-CCD) and artificial neural network (ANN) methods were used to investigate the effect of parameters and determine optimal conditions. Also, the maximum efficiency of biodiesel production (98.83%) was predicted by the RSM-CCD method at 65 °C, 4 wt% catalyst content, 200 min duration, and 18: 1 methanol to oil ratio. The process of biodiesel production was exothermic. The activation energy and frequency factor were calculated 45.53 kJ/mol and 6.03 × 10+4 min−1, respectively. Biodiesel properties were evaluated according to international standards (ASTM D6751 and EN14214 ). The catalyst was reused for up to 90% efficiency in up to 5 steps.
Research Interests:
Abstract In the current investigation, the adsorptive performance of hydroxyapatite (HAp) was improved by using Fe3O4 magnetic nanoparticles and polydopamine (PDA) and was applied to eliminate Hg(II), Co(II), and Ni(II). The tests of XPS,... more
Abstract In the current investigation, the adsorptive performance of hydroxyapatite (HAp) was improved by using Fe3O4 magnetic nanoparticles and polydopamine (PDA) and was applied to eliminate Hg(II), Co(II), and Ni(II). The tests of XPS, XRD, EDX, FTIR, TGA, and VSM were applied to identify the HAp/Fe3O4/PDA structure and adsorption mechanisms. Based on the finding, pH was of the most effective variables in the elimination process and the highest yield was determined at pH 6 for all studied metals. The equilibrium data followed the Langmuir and Freundlich models (R2 > 0.9). According to isotherm modeling, Hg(II), Co(II), and Ni(II) removal using HAp/Fe3O4/PDA has a physical mechanism. The highest elimination capacity (qm) for Hg(II), Co(II), and Ni(II) was set at 51.73 mg/g, 49.32 mg/g, and 48.09 mg/g, respectively. The effect of contact time had a good consistency with the findings of the Weber and Morris kinetic, as the process was done in two steps. The Gibbs free energy parameter revealed that the abatement process is spontaneous and its spontaneity degree decreases with elevating temperature. Various analyzes were used to explore the characteristics of the HAp/Fe3O4/PDA composite. In summary, HAp/Fe3O4/PDA had an effective capability to remove toxic metals from distilled water and landfill leachate.
Research Interests:
Abstract In the current study, a heterogeneous solid base catalyst was manufactured by the reaction of waste glass with NaOH and used to generate biodiesel from chicken fat. The surface technical methods were used to characterize the... more
Abstract In the current study, a heterogeneous solid base catalyst was manufactured by the reaction of waste glass with NaOH and used to generate biodiesel from chicken fat. The surface technical methods were used to characterize the produced catalyst. The active phase in the catalyst was Na2SiO3. The data showed that the catalyst is efficient to produce biodiesel from chicken fat (90% efficiency up to fourth stages of reuse). The effect of important variables such as reaction time, temperature, catalyst content, and methanol to oil ratio on the biodiesel production efficiency was optimized by RSM-CCD and artificial neural network (ANN). Maximum biodiesel production was calculated as 98.77% and 97.74% using RSM-CCD and ANN, respectively. The quality of the produced biodiesel was checked by ASTM D 6751 and EN 11214 standards. Also, the produced biodiesel was not toxic to plant and microorganisms and it is a biocompatible fuel.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
In this work, Zeolite/Fe3O4 nanocomposite used for adsorption of Blue 41 cationic dye from aqueous solutions in a wide range of concentrations. Analyzes of FTIR, XRD, FESEM, VSM and XRF have confirmed the nature and the structure of... more
In this work, Zeolite/Fe3O4 nanocomposite used for adsorption of Blue 41 cationic dye from aqueous solutions in a wide range of concentrations. Analyzes of FTIR, XRD, FESEM, VSM and XRF have confirmed the nature and the structure of Zeolite/Fe3O4 nanocomposite adsorbent. The obtained results and analyzes determined that adsorption process efficiency increases by increasing reaction time, pH and amount of adsorbent and versus, increasing dye initial concentration causes significant decrease of adsorption efficiency. The obtained results of adsorption of isotherm and kinetics study illustrated that data follows Freundlich model and pseudo second order kinetics. Under optimum conditions of pH = 9, dye initial concentration of 100 mg/L, adsorbent dose of 3 g/L and reaction time of 60 min, removal efficiency was obtained 71.4 %. Totally results showed that Zeolite/Fe3O4 nanocomposite can be used by scrutiny of operating conditions of the adsorption process as a adsorbent with high effect...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
ABSTRACT This research has analysed the physiochemical properties of a catalyst that has been developed – biochar-La, including BJH, BET, EDX, SEM, FTIR, pHpzc, and iodine number. The catalyst consisted of effective functional groups,... more
ABSTRACT This research has analysed the physiochemical properties of a catalyst that has been developed – biochar-La, including BJH, BET, EDX, SEM, FTIR, pHpzc, and iodine number. The catalyst consisted of effective functional groups, including C=S, C–O, C=C, –COOH and O–H, with a specific surface area of 31.2 m2/g. The catalyst was used in the biochar-La/ultrasonic/persulphate system to remove phenol from wastewater. The kinetics, mechanism, and reusability of the catalyst for the phenol removal from synthetic wastewater were determined. The results suggested that phenol removal kinetics follows pseudo-first-order model (k = 0.0386 1/min), and the catalyst can be reused three times. The potential of operation of the biochar-La/ultrasonic/persulphate system – with the effective removal of phenol and other organic compounds from real petrochemical wastewater – was tested. The results indicated that the removal of phenol from the petrochemical wastewater with a relatively high total dissolved solid is >99%. The gas chromatography–mass spectrometry (GC-mass) test revealed that the complete decomposition of some contaminants in the petrochemical wastewater had occurred, as H2O and CO2 were detected. The contribution of a heterogeneous mechanism for phenol oxidation by biochar-La/ultrasonic/persulphate was calculated to be 60%. Overall, the results showed that the biochar-La/ultrasonic/persulphate system is very effective and promising for the removal of phenol from the petrochemical wastewater.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
In this study, the optimized experimental condition s to obtain the partial trans- esterification of su nflower and palm kernel oil with methanol, using KOH and NaOH as an alkaline catalyst, for biodiesel producing (methyl esters) were... more
In this study, the optimized experimental condition s to obtain the partial trans- esterification of su nflower and palm kernel oil with methanol, using KOH and NaOH as an alkaline catalyst, for biodiesel producing (methyl esters) were performed. The effect of various parameters in cluding reaction temperature (40-60ºC), reaction time (30-6 0 min), quantity of catalyst (0.5-1.25 %wt.), and met hanol on oil ratio (1:3-1:6) on the efficiency of b iodiesel production were tested. Maximum biodiesel (98.12%) was produced by KOH catalyst at reaction time of 60 min, temperature 60 ºC and methanol to oil ratio of 4:1. The optimum conditions for biodiesel production an d biodiesel properties for the both catalysts were determined b ased on 14214EN and ASTM D6751 methods. Results sho wed that the best amount of catalysts to produce the bi odiesel using sunflower oil and palm kernel oil was obtained 0.75 wt. %. in both catalysts
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Antibiotics, as pollutants of emerging concern, can enter marine environments, rivers, and lakes and endanger ecology and human health. The purpose of this study was to review the studies conducted on the presence of antibiotics in water,... more
Antibiotics, as pollutants of emerging concern, can enter marine environments, rivers, and lakes and endanger ecology and human health. The purpose of this study was to review the studies conducted on the presence of antibiotics in water, sediments, and organisms in aquatic environments (i.e., seas, rivers, and lakes). Most of the reviewed studies were conducted in 2018 (15%) and 2014 (11%). Antibiotics were reported in aqueous media at a concentration of <1 ng/L–100 μg/L. The results showed that the highest number of works were conducted in the Asian continent (seas: 74%, rivers: 78%, lakes: 87%, living organisms: 100%). The highest concentration of antibiotics in water and sea sediments, with a frequency of 49%, was related to fluoroquinolones. According to the results, the highest amounts of antibiotics in water and sediment were reported as 460 ng/L and 406 ng/g, respectively. In rivers, sulfonamides had the highest abundance (30%). Fluoroquinolones (with an abundance of 34%)...
Research Interests:
Research Interests:
A new nanocomposite based on Cloisite 30B clay modified with ZnO and Ag2O nanoparticles (Cloisite 30B/ZnO/Ag2O) was synthesized as an effective catalyst in the sono-photocatalytic process of crystal violet (CV) and methylene blue (MB)... more
A new nanocomposite based on Cloisite 30B clay modified with ZnO and Ag2O nanoparticles (Cloisite 30B/ZnO/Ag2O) was synthesized as an effective catalyst in the sono-photocatalytic process of crystal violet (CV) and methylene blue (MB) dyes simultaneously. The characteristics and catalytic activity of Cloisite 30B/ZnO/Ag2O nanocomposite were investigated under different conditions. The specific active surface for Cloisite 30B/ZnO/Ag2O nanocomposite was 18.29 m2/g. Additionally, the catalytic activity showed that Cloisite 30B/ZnO/Ag2O nanocomposite (CV: 99.21%, MB: 98.43%) compared to Cloisite 30B/Ag2O (CV: 85.38%, MB: 83.62%) and Ag2O (CV: 68.21%, MB: 66.41%) has more catalytic activity. The catalytic activity of Cloisite 30B/ZnO/Ag2O using the sono-photocatalytic process had the maximum efficiency (CV: 99.21%, MB: 98.43%) at pH 8, time of 50 min, amount of 40 mM H2O2, catalyst dose of 0.5 g/L, and the concentration of ‘CV + MB’ of 5 mg/L. The catalyst can be reused in the sono-photo...
Research Interests:
The increase in annual usage of plastics for different purposes has led to an increase in microplastics (MPs) particles in various environments including inside of buildings. In the present study, levels and characteristics of MPs in the... more
The increase in annual usage of plastics for different purposes has led to an increase in microplastics (MPs) particles in various environments including inside of buildings. In the present study, levels and characteristics of MPs in the indoor dust of buildings with different uses including residential house, mosque, hospital, kindergarten, and university in two cities, Bushehr port and Shiraz in Iran, were determined. Thirty dust samples from various buildings were collected. The average numbers of MPs in the indoor dust of buildings of Shiraz and Bushehr were 90.8 and 80.8 items/mg, respectively. Fiber and polyethylene (PE) were the most common shape and polymer types of identified MPs, respectively. The highest number of MPs was observed in the indoor dust of kindergartens with a mean number of 121 items/mg in Bushehr and 104 items/mg in Shiraz. Except for mosques, a significant difference (p-value <0.05) were not observed between the MPs levels of buildings with similar applications in Bushehr and Shiraz cities. In addition, the high daily intake to MPs via indoor dust ingestion and inhalation were found for infants in kindergartens and mosques. The results of this study showed that MPs are present in high concentrations in indoor environments and may pose a high exposure risk for different age groups.
Research Interests:
An adsorbent has been prepared from Populus alba using the NH 4 Br-soaked activated carbon (NBAC) for cyanide removal. A series of tests have been conducted to evaluate the influence of the main parameters such as the wastewater p H,... more
An adsorbent has been prepared from Populus alba using the NH 4 Br-soaked activated carbon (NBAC) for cyanide removal. A series of tests have been conducted to evaluate the influence of the main parameters such as the wastewater p H, reaction time, cyanide concentration, and the NBAC quantity obtained upon the adsorption of cyanide onto NBAC. At an optimum p H of 9, more than 97% of the 200 mg/L cyanide is removed by a low NBAC dose of 1.25 mg/L during a 40 min contact time. Kinetic and isotherm modeling studies demonstrate that the experimental data best fit a pseudo-second order and Langmuir model, respectively. The maximum Langmuir adsorption capacity has been attained 102.5 mg/g at 24°C. Thermodynamic study of cyanide adsorption by NBAC has also been carried out. The efficacy of NBCA has been examined by analyzing the removal of cyanide from an industrial wastewater. Overall, NBAC is an efficient and low-cost adsorbent for the removal of different concentrations of cyanide from ...