In this research, the photocatalytic removal of reactive blue 19 (RB19) dye is investigated emplo... more In this research, the photocatalytic removal of reactive blue 19 (RB19) dye is investigated employing zinc oxide/cerium (ZnO@Ce) nanoparticles decorated with biochar under LED irradiation. Synthesis of ZnO@Ce nanoparticles decorated with biochar was performed utilizing the co-precipitation procedure and, then, the texture and morphology of the fabricated nanocomposite were analyzed using energy dispersive X-ray (EDX), field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), and Fourier transform infrared (FTIR) spectroscopy techniques. Moreover, FE-SEM images demonstrate that ZnO–Ce nanoparticles were successfully decorated on the surface of biochar. The specific surface areas of biochar and biochar/ZnO–Ce were 519.75 and 636.52 m2/g, respectively. To achieve the maximum yield in the removal of RB19 dye, the effects of operating variables including dye concentration, LED lamp power, bi...
In this study, the TiO 2-ZnO-CuO nanoparticles were primed by sol-gel method characterized by X-r... more In this study, the TiO 2-ZnO-CuO nanoparticles were primed by sol-gel method characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), for degradation of MTBE solution in water. The effectiveness of the treatment method applied for the degradation of MTBE based on an advanced photocatalytic oxidation process was investigated. The three various key parameters were optimized using response surface modeling namely: pH, TiO 2-ZnO-CuO concentration and the initial MTBE concentrations. The optimized values were obtained at the PH (7), TiO 2-ZnO-CuO concentration (1.49 g/L), and the initial MTBE concentration (31.46 mg/L). Finally, kinetics reaction of degradtion MTBE was carried in the optimum conditions.
Iranian Journal of Chemistry & Chemical Engineering-international English Edition, Jun 1, 2018
Nano-structure of Co-Mn spinel oxide was prepared by the thermal decomposition method using [Co(N... more Nano-structure of Co-Mn spinel oxide was prepared by the thermal decomposition method using [Co(NH3)4CO3]MnO4 as the precursor. The properties of the synthesized material were characterized by X-Ray Diffraction (XRD), Brunauer-Emmett-Teller (BET), Transmission Electron Microscopy (TEM), surface area measurements, Energy-Dispersive X-ray (EDX) spectroscopy analysis, UV-Vis spectrophotometer (UV-Vis), Fourier Transform InfraRed (FT-IR), Thermal Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) analyses. The results show that Co-Mn spinel oxide is spherical in shape and possess crystallite size is about 12 nm. The catalytic activity and product selectivity were also investigated, in a micro-reactor (Fischer-Tropsch Synthesis (FTS) reaction) and the results compared with conventional Co-Mn oxide catalyst. The catalyst performance increased as the particle size of the catalyst decreased. Moreover, the olefin to paraffin ratios was increased, compared to the conventional catalyst.
The aim of the study was to determine the effect of scientific collaboration between domestic (Ir... more The aim of the study was to determine the effect of scientific collaboration between domestic (Iranian) and foreign authors on their quality indices in articles published in Iranian medical journals, indexed in the Web of Science citation database. The present scientometric study was conducted on the 22 Iranian medical journals that indexed in Web of Science from 2010 to 2016. Using stratified systematic random sampling method and Cochran formula, the sample size was determined 1230 articles. The data analysis was performed by Microsoft Excel and descriptive methods. The qualitative indices were determined using the Klimogrof-Smirnov test, Kruskal-Wallis test and correlation coefficient. The results revealed that 4.66 percent of the articles were compiled by Iranian authors, 29 percent written by foreign authors and 6.4 percent was written by scientific collaboration between Iranian and foreign authors. The average number of authors for each article was 4.9. The journals that have a...
Advances in environmental science and technology, 2017
The objective of this study was to investigate the growth rate of Chlorella vulgaris for CO2 biof... more The objective of this study was to investigate the growth rate of Chlorella vulgaris for CO2 biofixation and biomass production. Six mathematical growth models (Logistic, Gompertz, modified Gompertz, Baranyi, Morgan and Richards) were used to evaluate the biomass productivity in continuous processes and to predict the following parameters of cell growth: lag phase duration (λ), maximum specific growth rate (μmax), and maximum cell concentration (Xmax). The low root-mean-square error (RMSE) and high regression coefficients (R2) indicated that the models employed were well fitted to the experiment data and it could be regarded as enough to describe biomass production. Using statistical and physiological significance criteria, the Baranyi model was considered the most appropriate for quantifying biomass growth. The biological variables of this model are as follows: μmax=0.0309 h−1, λ=100 h, and Xmax=1.82 g/L.
In this study, the TiO 2 -ZnO-CuO nanoparticles were primed by sol-gel method characterized by X-... more In this study, the TiO 2 -ZnO-CuO nanoparticles were primed by sol-gel method characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), for degradation of MTBE solution in water. The effectiveness of the treatment method applied for the degradation of MTBE based on an advanced photocatalytic oxidation process was investigated. The three various key parameters were optimized using response surface modeling namely: pH, TiO 2 -ZnO-CuO concentration and the initial MTBE concentrations. The optimized values were obtained at the PH (7), TiO 2 -ZnO-CuO concentration (1.49 g/L), and the initial MTBE concentration (31.46 mg/L). Finally, kinetics reaction of degradtion MTBE was carried in the optimum conditions.
Objectives: This study investigated the relationship between viral load and the incidence and rec... more Objectives: This study investigated the relationship between viral load and the incidence and recovery of olfactory and gustatory dysfunction (OD and GD), incidence of respiratory and gastrointestinal symptoms in COVID-19 patients. Design: A Retrospective Cohort Study. Setting and Participants: In total 599 outpatients’ cases polymerase chain reaction (PCR)–confirmed COVID-19-positive patients in Golestan province were included in the study. Main Outcome Measures: The incidence of OD, GD, their severity and the time of recovery was determined. The association of these variables with cycle threshold (CT) values of SARS-CoV-2 polymerase chain reaction was assessed. Results: The mean age of patients was 38.27 ± 13.62 years. The incidence of general symptoms included myalgia 70.1%, headache 51.8%, fever 47.7%, and dyspnea 21.4%. 41.9% of patients had gastrointestinal symptoms, including abdominal pain 26.5%, diarrhea 25.2%, nausea 20.5%, and vomiting 12.9%. 12.2% of patients had comorbi...
There is a lack of well-verified models in the literature for the prediction of the frictional pr... more There is a lack of well-verified models in the literature for the prediction of the frictional pressure drop (FPD) in the helically coiled tubes at different conditions/orientations. In this study, the robust and universal models for estimating two-phase FPD in smooth coiled tubes with different orientations were developed using several intelligent approaches. For this reason, a databank comprising 1267 experimental data samples was collected from 12 independent studies, which covers a broad range of fluids, tube diameters, coil diameters, coil axis inclinations, mass fluxes, saturation temperatures, and vapor qualities. The earlier models for straight and coiled tubes were examined using the collected database, which showed absolute average relative error (AARE) higher than 21%. The most relevant dimensionless groups were used as models’ inputs, and the neural network approach of multilayer perceptron and radial basis functions (RBF) were developed based on the homogenous equilibri...
Presence on the Web and the realization of webometric indicators are one of the most important in... more Presence on the Web and the realization of webometric indicators are one of the most important indicators of reflecting the international presence of universities. This study evaluates the content and technical characteristics that influence webometric rankings on Golestan University of Medical Sciences websites. This research is a descriptive practical survey that describes the status of the website based on the content and technical features that influence the promotion of webometric rankings. A total of 53 Golestan University of Medical Sciences websites were included, consisted of 7 college websites, 8 Deputies websites, and 16 websites for hospitals and 22 websites for research centers. Data were collected using checklist. Result shows that 49.46 percent of the expected indicators were met by the units. Colleges with the overall average of 57.64 percent had the highest compliance and the hospitals with 36.72 percent had the lowest compliance with the webometric indexes. The results show that 54.72 percent of the Deputies and 47.73 percent of the research centers have met the indicators. According to the findings, notice to the indicators that less-considered, is necessary for webometric managers and researchers. Also, given that Golestan University of Medical Sciences is the weakest in the Impact Index, considering the number of backlinks identified by search engines is one of the priorities of web infrastructure enhancement programs.
Your article is protected by copyright and all rights are held exclusively by Iran Polymer and Pe... more Your article is protected by copyright and all rights are held exclusively by Iran Polymer and Petrochemical Institute. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your work, please use the accepted author's version for posting to your own website or your institution's repository. You may further deposit the accepted author's version on a funder's repository at a funder's request, provided it is not made publicly available until 12 months after publication.
Journal of Industrial and Engineering Chemistry, 2012
The effect of a range of operation variables such as pressure, low temperature and H 2 /CO molar ... more The effect of a range of operation variables such as pressure, low temperature and H 2 /CO molar feed ration the catalytic performance of 80%Co/20%Ni/30 wt% La 2 O 3 /1 wt% Cs catalyst was investigated. It was found that the optimum operating conditions is a H 2 /CO = 2/1 molar feed ratio at 260 8C temperature and 2 bar pressure. Reaction rate equations were derived on the basis of the Langmuir-Hinshelwood-Hougen-Watson (LHHW) type models for the Fischer-Tropsch reactions. The activation energy obtained was 59.69 kJ/mol for optimal kinetic model.
The rate of synthesis gas consumption over a cobalt Fischer-Tropsch catalyst was measured in a we... more The rate of synthesis gas consumption over a cobalt Fischer-Tropsch catalyst was measured in a well-mixed, continuous-flow, slurry reactor at 220-240 "C, 0.5-1.5 MPa, H2/C0 feed ratios of 1.5-3.5, and conversions of 6 4 8 % of hydrogen and 11-73% of carbon monoxide. The inhibiting effect of carbon monoxide was determined quantitatively and a Langmuir-Hinshelwood-type equation of the following form was found to best represent the results-RH2+C0 = aPcoPH /(1+ bPco)2. The apparent activation energy was 93-95 kJ/mol. Data from previous studies on co6alt-based Fischer-Tropsch catalysts are also well correlated with this rate expression.
Using nanoparticles for adsorbing asphaltene was known as an efficient method among researchers f... more Using nanoparticles for adsorbing asphaltene was known as an efficient method among researchers for crude oil upgrading. In this study, zeolite-zirconia-copper nanocomposites (NCs) have been synthesized and characterized with Scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and energy-dispersive X-ray (EDX). Then, CO2-oil interfacial tension (IFT) tests, Ultraviolet–visible spectroscopy (UV–Vis) Langmuir and Freundlich isotherm models, asphaltene precipitation tests at static phase, and dynamic CO2 flooding tests were performed in the presence of NCs and the results were compared with zeolite nanoparticles. Based on the characterization results, zirconia-copper particles were distributed at the surface of zeolite with total dimensions less than 30 nm, and the specific surface areas of the NCs (327.82 m2/g) was less than the pure zeolite (369.48 m2/g). It was seen that NCs had a greater asphaltene adsorption capacity and the application of de...
In the present study, the sol–gel method is used to synthesize pure TiO2, TiO2–ZnO and TiO2–ZnO–N... more In the present study, the sol–gel method is used to synthesize pure TiO2, TiO2–ZnO and TiO2–ZnO–NiO (TZN) nanoparticles. The study aims at investigating the photocatalytic efficiency of the synthesized nanoparticles used in order to remove methyl orange (MO, as a model water pollutant) dye, as exposed to black light radiation. Moreover, it also addresses the factors that may positively or negatively affect the efficiency of the photocatalytic process. XRD, SEM and DRS analyses were used to determine the nanocatalysts’ properties. The response surface method (RSM) was used to investigate the effect of four operating parameters [including the catalyst loading (TZN), basic dye concentration, pH and H2O2 concentration] and optimize the photocatalytic process of MO dye degradation in 60 min. Maximum dye removal percentage was obtained under the best operating conditions (catalyst loading = 0.3 g/l, dye concentration = 15 mg/l, pH 3 and H2O2 concentration = 15 ml/l). The high correlation coefficient (R2 = 0.9930) showed that there is an acceptable level of consistency between the experimental data and the resulted MO dye degradation predictions using the response surface model. Appropriate modules were used to carry out the two-dimensional steady-state computational fluid dynamic (CFD) simulation of the advanced oxidation process in the photocatalytic reactor. A quasi-first-order kinetic equation derived from the Langmuir–Hinshelwood model (kapp = 0.015 min−1) was used to account for the photocatalytic process of MO dye degradation. The value of R2 = 0.8865 indicated the significant consistency between the simulated CFD concentration values and experimental data.
Using nanoparticles for adsorbing asphaltene was known as an efficient method among researchers f... more Using nanoparticles for adsorbing asphaltene was known as an efficient method among researchers for crude oil upgrading and in this study, Zeolite-zirconia-copper nanocomposites (NCs) has been synthesized and characterized with SEM, XRD, BET, and EDX for asphaltene precipitation inhibition in the static phase and solving asphaltene deposition problems of dynamic CO2 flooding in low permeability carbonate reservoir. CO2-oil IFT tests, isotherm models, natural depletion tests at static phase were performed in the presence of NCs and the results were compared with zeolite nanoparticles. Then, CO2 core flooding tests at dynamic phase were designed in the presence of NCs at obtained static conditions for surveying permeability/porosity reduction in porous media. After adding NCs and zeolite nanoparticles, the 2nd to 1st slope ratio in CO2-oil IFT tests increased from 19.697 % to 20.895 % and 29.851 %, respectively which shows NCs adsorbed more asphaltene in comparison to zeolite nanopart...
In this research, the photocatalytic removal of reactive blue 19 (RB19) dye is investigated emplo... more In this research, the photocatalytic removal of reactive blue 19 (RB19) dye is investigated employing zinc oxide/cerium (ZnO@Ce) nanoparticles decorated with biochar under LED irradiation. Synthesis of ZnO@Ce nanoparticles decorated with biochar was performed utilizing the co-precipitation procedure and, then, the texture and morphology of the fabricated nanocomposite were analyzed using energy dispersive X-ray (EDX), field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), and Fourier transform infrared (FTIR) spectroscopy techniques. Moreover, FE-SEM images demonstrate that ZnO–Ce nanoparticles were successfully decorated on the surface of biochar. The specific surface areas of biochar and biochar/ZnO–Ce were 519.75 and 636.52 m2/g, respectively. To achieve the maximum yield in the removal of RB19 dye, the effects of operating variables including dye concentration, LED lamp power, bi...
In this study, the TiO 2-ZnO-CuO nanoparticles were primed by sol-gel method characterized by X-r... more In this study, the TiO 2-ZnO-CuO nanoparticles were primed by sol-gel method characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), for degradation of MTBE solution in water. The effectiveness of the treatment method applied for the degradation of MTBE based on an advanced photocatalytic oxidation process was investigated. The three various key parameters were optimized using response surface modeling namely: pH, TiO 2-ZnO-CuO concentration and the initial MTBE concentrations. The optimized values were obtained at the PH (7), TiO 2-ZnO-CuO concentration (1.49 g/L), and the initial MTBE concentration (31.46 mg/L). Finally, kinetics reaction of degradtion MTBE was carried in the optimum conditions.
Iranian Journal of Chemistry & Chemical Engineering-international English Edition, Jun 1, 2018
Nano-structure of Co-Mn spinel oxide was prepared by the thermal decomposition method using [Co(N... more Nano-structure of Co-Mn spinel oxide was prepared by the thermal decomposition method using [Co(NH3)4CO3]MnO4 as the precursor. The properties of the synthesized material were characterized by X-Ray Diffraction (XRD), Brunauer-Emmett-Teller (BET), Transmission Electron Microscopy (TEM), surface area measurements, Energy-Dispersive X-ray (EDX) spectroscopy analysis, UV-Vis spectrophotometer (UV-Vis), Fourier Transform InfraRed (FT-IR), Thermal Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) analyses. The results show that Co-Mn spinel oxide is spherical in shape and possess crystallite size is about 12 nm. The catalytic activity and product selectivity were also investigated, in a micro-reactor (Fischer-Tropsch Synthesis (FTS) reaction) and the results compared with conventional Co-Mn oxide catalyst. The catalyst performance increased as the particle size of the catalyst decreased. Moreover, the olefin to paraffin ratios was increased, compared to the conventional catalyst.
The aim of the study was to determine the effect of scientific collaboration between domestic (Ir... more The aim of the study was to determine the effect of scientific collaboration between domestic (Iranian) and foreign authors on their quality indices in articles published in Iranian medical journals, indexed in the Web of Science citation database. The present scientometric study was conducted on the 22 Iranian medical journals that indexed in Web of Science from 2010 to 2016. Using stratified systematic random sampling method and Cochran formula, the sample size was determined 1230 articles. The data analysis was performed by Microsoft Excel and descriptive methods. The qualitative indices were determined using the Klimogrof-Smirnov test, Kruskal-Wallis test and correlation coefficient. The results revealed that 4.66 percent of the articles were compiled by Iranian authors, 29 percent written by foreign authors and 6.4 percent was written by scientific collaboration between Iranian and foreign authors. The average number of authors for each article was 4.9. The journals that have a...
Advances in environmental science and technology, 2017
The objective of this study was to investigate the growth rate of Chlorella vulgaris for CO2 biof... more The objective of this study was to investigate the growth rate of Chlorella vulgaris for CO2 biofixation and biomass production. Six mathematical growth models (Logistic, Gompertz, modified Gompertz, Baranyi, Morgan and Richards) were used to evaluate the biomass productivity in continuous processes and to predict the following parameters of cell growth: lag phase duration (λ), maximum specific growth rate (μmax), and maximum cell concentration (Xmax). The low root-mean-square error (RMSE) and high regression coefficients (R2) indicated that the models employed were well fitted to the experiment data and it could be regarded as enough to describe biomass production. Using statistical and physiological significance criteria, the Baranyi model was considered the most appropriate for quantifying biomass growth. The biological variables of this model are as follows: μmax=0.0309 h−1, λ=100 h, and Xmax=1.82 g/L.
In this study, the TiO 2 -ZnO-CuO nanoparticles were primed by sol-gel method characterized by X-... more In this study, the TiO 2 -ZnO-CuO nanoparticles were primed by sol-gel method characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), for degradation of MTBE solution in water. The effectiveness of the treatment method applied for the degradation of MTBE based on an advanced photocatalytic oxidation process was investigated. The three various key parameters were optimized using response surface modeling namely: pH, TiO 2 -ZnO-CuO concentration and the initial MTBE concentrations. The optimized values were obtained at the PH (7), TiO 2 -ZnO-CuO concentration (1.49 g/L), and the initial MTBE concentration (31.46 mg/L). Finally, kinetics reaction of degradtion MTBE was carried in the optimum conditions.
Objectives: This study investigated the relationship between viral load and the incidence and rec... more Objectives: This study investigated the relationship between viral load and the incidence and recovery of olfactory and gustatory dysfunction (OD and GD), incidence of respiratory and gastrointestinal symptoms in COVID-19 patients. Design: A Retrospective Cohort Study. Setting and Participants: In total 599 outpatients’ cases polymerase chain reaction (PCR)–confirmed COVID-19-positive patients in Golestan province were included in the study. Main Outcome Measures: The incidence of OD, GD, their severity and the time of recovery was determined. The association of these variables with cycle threshold (CT) values of SARS-CoV-2 polymerase chain reaction was assessed. Results: The mean age of patients was 38.27 ± 13.62 years. The incidence of general symptoms included myalgia 70.1%, headache 51.8%, fever 47.7%, and dyspnea 21.4%. 41.9% of patients had gastrointestinal symptoms, including abdominal pain 26.5%, diarrhea 25.2%, nausea 20.5%, and vomiting 12.9%. 12.2% of patients had comorbi...
There is a lack of well-verified models in the literature for the prediction of the frictional pr... more There is a lack of well-verified models in the literature for the prediction of the frictional pressure drop (FPD) in the helically coiled tubes at different conditions/orientations. In this study, the robust and universal models for estimating two-phase FPD in smooth coiled tubes with different orientations were developed using several intelligent approaches. For this reason, a databank comprising 1267 experimental data samples was collected from 12 independent studies, which covers a broad range of fluids, tube diameters, coil diameters, coil axis inclinations, mass fluxes, saturation temperatures, and vapor qualities. The earlier models for straight and coiled tubes were examined using the collected database, which showed absolute average relative error (AARE) higher than 21%. The most relevant dimensionless groups were used as models’ inputs, and the neural network approach of multilayer perceptron and radial basis functions (RBF) were developed based on the homogenous equilibri...
Presence on the Web and the realization of webometric indicators are one of the most important in... more Presence on the Web and the realization of webometric indicators are one of the most important indicators of reflecting the international presence of universities. This study evaluates the content and technical characteristics that influence webometric rankings on Golestan University of Medical Sciences websites. This research is a descriptive practical survey that describes the status of the website based on the content and technical features that influence the promotion of webometric rankings. A total of 53 Golestan University of Medical Sciences websites were included, consisted of 7 college websites, 8 Deputies websites, and 16 websites for hospitals and 22 websites for research centers. Data were collected using checklist. Result shows that 49.46 percent of the expected indicators were met by the units. Colleges with the overall average of 57.64 percent had the highest compliance and the hospitals with 36.72 percent had the lowest compliance with the webometric indexes. The results show that 54.72 percent of the Deputies and 47.73 percent of the research centers have met the indicators. According to the findings, notice to the indicators that less-considered, is necessary for webometric managers and researchers. Also, given that Golestan University of Medical Sciences is the weakest in the Impact Index, considering the number of backlinks identified by search engines is one of the priorities of web infrastructure enhancement programs.
Your article is protected by copyright and all rights are held exclusively by Iran Polymer and Pe... more Your article is protected by copyright and all rights are held exclusively by Iran Polymer and Petrochemical Institute. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your work, please use the accepted author's version for posting to your own website or your institution's repository. You may further deposit the accepted author's version on a funder's repository at a funder's request, provided it is not made publicly available until 12 months after publication.
Journal of Industrial and Engineering Chemistry, 2012
The effect of a range of operation variables such as pressure, low temperature and H 2 /CO molar ... more The effect of a range of operation variables such as pressure, low temperature and H 2 /CO molar feed ration the catalytic performance of 80%Co/20%Ni/30 wt% La 2 O 3 /1 wt% Cs catalyst was investigated. It was found that the optimum operating conditions is a H 2 /CO = 2/1 molar feed ratio at 260 8C temperature and 2 bar pressure. Reaction rate equations were derived on the basis of the Langmuir-Hinshelwood-Hougen-Watson (LHHW) type models for the Fischer-Tropsch reactions. The activation energy obtained was 59.69 kJ/mol for optimal kinetic model.
The rate of synthesis gas consumption over a cobalt Fischer-Tropsch catalyst was measured in a we... more The rate of synthesis gas consumption over a cobalt Fischer-Tropsch catalyst was measured in a well-mixed, continuous-flow, slurry reactor at 220-240 "C, 0.5-1.5 MPa, H2/C0 feed ratios of 1.5-3.5, and conversions of 6 4 8 % of hydrogen and 11-73% of carbon monoxide. The inhibiting effect of carbon monoxide was determined quantitatively and a Langmuir-Hinshelwood-type equation of the following form was found to best represent the results-RH2+C0 = aPcoPH /(1+ bPco)2. The apparent activation energy was 93-95 kJ/mol. Data from previous studies on co6alt-based Fischer-Tropsch catalysts are also well correlated with this rate expression.
Using nanoparticles for adsorbing asphaltene was known as an efficient method among researchers f... more Using nanoparticles for adsorbing asphaltene was known as an efficient method among researchers for crude oil upgrading. In this study, zeolite-zirconia-copper nanocomposites (NCs) have been synthesized and characterized with Scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and energy-dispersive X-ray (EDX). Then, CO2-oil interfacial tension (IFT) tests, Ultraviolet–visible spectroscopy (UV–Vis) Langmuir and Freundlich isotherm models, asphaltene precipitation tests at static phase, and dynamic CO2 flooding tests were performed in the presence of NCs and the results were compared with zeolite nanoparticles. Based on the characterization results, zirconia-copper particles were distributed at the surface of zeolite with total dimensions less than 30 nm, and the specific surface areas of the NCs (327.82 m2/g) was less than the pure zeolite (369.48 m2/g). It was seen that NCs had a greater asphaltene adsorption capacity and the application of de...
In the present study, the sol–gel method is used to synthesize pure TiO2, TiO2–ZnO and TiO2–ZnO–N... more In the present study, the sol–gel method is used to synthesize pure TiO2, TiO2–ZnO and TiO2–ZnO–NiO (TZN) nanoparticles. The study aims at investigating the photocatalytic efficiency of the synthesized nanoparticles used in order to remove methyl orange (MO, as a model water pollutant) dye, as exposed to black light radiation. Moreover, it also addresses the factors that may positively or negatively affect the efficiency of the photocatalytic process. XRD, SEM and DRS analyses were used to determine the nanocatalysts’ properties. The response surface method (RSM) was used to investigate the effect of four operating parameters [including the catalyst loading (TZN), basic dye concentration, pH and H2O2 concentration] and optimize the photocatalytic process of MO dye degradation in 60 min. Maximum dye removal percentage was obtained under the best operating conditions (catalyst loading = 0.3 g/l, dye concentration = 15 mg/l, pH 3 and H2O2 concentration = 15 ml/l). The high correlation coefficient (R2 = 0.9930) showed that there is an acceptable level of consistency between the experimental data and the resulted MO dye degradation predictions using the response surface model. Appropriate modules were used to carry out the two-dimensional steady-state computational fluid dynamic (CFD) simulation of the advanced oxidation process in the photocatalytic reactor. A quasi-first-order kinetic equation derived from the Langmuir–Hinshelwood model (kapp = 0.015 min−1) was used to account for the photocatalytic process of MO dye degradation. The value of R2 = 0.8865 indicated the significant consistency between the simulated CFD concentration values and experimental data.
Using nanoparticles for adsorbing asphaltene was known as an efficient method among researchers f... more Using nanoparticles for adsorbing asphaltene was known as an efficient method among researchers for crude oil upgrading and in this study, Zeolite-zirconia-copper nanocomposites (NCs) has been synthesized and characterized with SEM, XRD, BET, and EDX for asphaltene precipitation inhibition in the static phase and solving asphaltene deposition problems of dynamic CO2 flooding in low permeability carbonate reservoir. CO2-oil IFT tests, isotherm models, natural depletion tests at static phase were performed in the presence of NCs and the results were compared with zeolite nanoparticles. Then, CO2 core flooding tests at dynamic phase were designed in the presence of NCs at obtained static conditions for surveying permeability/porosity reduction in porous media. After adding NCs and zeolite nanoparticles, the 2nd to 1st slope ratio in CO2-oil IFT tests increased from 19.697 % to 20.895 % and 29.851 %, respectively which shows NCs adsorbed more asphaltene in comparison to zeolite nanopart...
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