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Abstract Vinasse is the final byproduct of biomass distillation, mainly from ethanol production from sugar and starch crops or cellulosic material. Its composition is predominantly 93% water and 7% solids. For each liter of alcohol... more
Abstract Vinasse is the final byproduct of biomass distillation, mainly from ethanol production from sugar and starch crops or cellulosic material. Its composition is predominantly 93% water and 7% solids. For each liter of alcohol produced in the sugarcane industry, 15 L of vinasse may be generated. This residue contains high levels of salt and organic contents. Disposal of sugarcane vinasse in soils and water bodies has caused environmental problems, mainly owing to salinization, the growing concentration of salts, and the change in pH levels. This practice alters the chemical and physicochemical properties of soils and water bodies with frequent discharges over a long period of time. Because of the large quantities of vinasse produced, alternative treatments and uses have been proposed, such as recycling vinasse in fermentation, fertirrigation, concentration by evaporation, and yeast and energy production. A few studies have been developed aimed at sugarcane vinasse recycling and appropriate disposal.
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Abstract The textile industry widely uses reactive dyes to obtain cotton fabrics having good resistance to color removal despite frequent washing. This level of dye usage generates substantial volumes of wastewater containing significant... more
Abstract The textile industry widely uses reactive dyes to obtain cotton fabrics having good resistance to color removal despite frequent washing. This level of dye usage generates substantial volumes of wastewater containing significant quantities of residual dye requiring treatment before discharges from commercial dyeing operations to public waterways. As part of a study aimed at recycling/reusing rather than discharging reactive dye wastewater, well-known dyes Reactive Yellow 176, Reactive Red 241, and Reactive Blue 221 were used in dyeing cotton fabric, and the generated wastewater samples were decolorized with H2O2 catalyzed by UV light. The efficiency of UV/H2O2 decolorization for trichromic wastewater was determined by UV-Vis monitoring at 550 nm, wherein it was found that more than 91% of color removal in trichromic wastewater occurred at pH 4. The reuse of wastewater was investigated by a total of three sequential cycles of wastewater treatments. The quality of cotton dyed with reused wastewater was assessed through color measurements using CIELAB, fastness to light, and wash fastness testing. Results showed that MCT/VS-based reactive dye wastewater arising from UV/ H2O2 treatment could be used for two subsequent dyeing cycles without compromising the quality of the color of the dyed cotton fabrics. The proposed treatment can also save water and salt, enhancing the economy of the dyeing process.
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Abstract The textile industry widely uses reactive dyes to obtain cotton fabrics having good resistance to color removal despite frequent washing. This level of dye usage generates substantial volumes of wastewater containing significant... more
Abstract The textile industry widely uses reactive dyes to obtain cotton fabrics having good resistance to color removal despite frequent washing. This level of dye usage generates substantial volumes of wastewater containing significant quantities of residual dye requiring treatment before discharges from commercial dyeing operations to public waterways. As part of a study aimed at recycling/reusing rather than discharging reactive dye wastewater, well-known dyes Reactive Yellow 176, Reactive Red 241, and Reactive Blue 221 were used in dyeing cotton fabric, and the generated wastewater samples were decolorized with H2O2 catalyzed by UV light. The efficiency of UV/H2O2 decolorization for trichromic wastewater was determined by UV-Vis monitoring at 550 nm, wherein it was found that more than 91% of color removal in trichromic wastewater occurred at pH 4. The reuse of wastewater was investigated by a total of three sequential cycles of wastewater treatments. The quality of cotton dyed with reused wastewater was assessed through color measurements using CIELAB, fastness to light, and wash fastness testing. Results showed that MCT/VS-based reactive dye wastewater arising from UV/ H2O2 treatment could be used for two subsequent dyeing cycles without compromising the quality of the color of the dyed cotton fabrics. The proposed treatment can also save water and salt, enhancing the economy of the dyeing process.
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Enhanced phosphorus management, geared towards sustainability, is imperative due to its indispensability for all life forms and its close association with water bodies’ eutrophication, primarily stemming from anthropogenic activities. In... more
Enhanced phosphorus management, geared towards sustainability, is imperative due to its indispensability for all life forms and its close association with water bodies’ eutrophication, primarily stemming from anthropogenic activities. In response to this concern, innovative technologies rooted in the circular economy are emerging, to remove and recover this vital nutrient to global food production. This research undertakes an evaluation of the dead-end filtration performance of a mixed matrix membrane composed of modified bentonite (MB) and polyvinylidene fluoride (PVDF) for efficient phosphorus removal from water media. The MB:PVDF membrane exhibited higher permeability and surface roughness compared to the pristine membrane, showcasing an adsorption capacity (Q) of 23.2 mgP.m-2. Increasing the adsorbent concentration resulted in a higher removal capacity (from 16.9 mgP.m-2 to 23.2 mgP.m-2) and increased solution flux (from 0.5 L.m-2.h-1 to 16.5 L.m-2.h-1) through the membrane. The...
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Organic agro-industrial residues have been successfully used as biosorbents and promoting new uses from agricultural wastes benefits the economy. However, the allocation of a solid waste biosorbent after the sorption of contaminants has... more
Organic agro-industrial residues have been successfully used as biosorbents and promoting new uses from agricultural wastes benefits the economy. However, the allocation of a solid waste biosorbent after the sorption of contaminants has limited their effective application on a large scale as an alternative treatment of water and wastewaters. One solution could be degradation to convert the biosorbent material and adsorbed organic contaminants into environmental friendly compounds suitable for discharge. This study used an experimental design to evaluate the Fenton degradation of yeast biomass (YB) from the alcohol industry as a potential biosorbent. The efficiency of degradation was monitored according to the degraded mass (DM) and total organic carbon (TOC) remaining in the solution. The ANOVA showed an error of 9.7% for the effects and the media of interaction for the employed model for DM. Conducting the experiments with the best-predicted conditions (60 min, 25 g of YB, pH 3, 8,...
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Single vessel procedure for acid-vapour partial digestion in a focused microwave: Fe and Co determination in biological samples by ETAAS
Department of Chemistry – Universidade Federal de São Paulo, Diadema SP, 09913-030 – Brazil Department of Chemistry, Universidade Federal da Paraíba, João Pessoa PB, 58051-970, Brazil. Center for Natural and Human Sciences, Universidade... more
Department of Chemistry – Universidade Federal de São Paulo, Diadema SP, 09913-030 – Brazil Department of Chemistry, Universidade Federal da Paraíba, João Pessoa PB, 58051-970, Brazil. Center for Natural and Human Sciences, Universidade Federal do ABC, Santo André SP, 09210-170, Brazil Institute of Science and Technology, Universidade Federal de São Paulo, São José dos Campos SP, 12231-280, Brazil Department of Natural Sciences, Mathematics and Education, Universidade Federal de São Carlos, Araras SP, 13604900, Brazil
Abstract Chemically activated carbons from yeast biomass waste were produced and later modified by treatment with HNO3 aiming at tuning their surface acid features. The obtained materials were successfully applied as catalyst in a... more
Abstract Chemically activated carbons from yeast biomass waste were produced and later modified by treatment with HNO3 aiming at tuning their surface acid features. The obtained materials were successfully applied as catalyst in a solvent-free solketal production process and the modified series of activated carbons displayed above average catalytic performance reaching glycerol conversion of up to 91% (TOF of 215 h−1) with 97% of selectivity toward solketal, as well as remarkable efficiency in consecutive catalytic runs. The physicochemical and surface chemistry properties of the activated carbons were characterized by means of N2 adsorption/desorption isotherms, thermal analysis, elemental analysis, surface functional groups titration (Boehm titration), X-rays diffraction and Raman spectroscopy.
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Abstract Vinasse is the final byproduct of biomass distillation, mainly from ethanol production from sugar and starch crops or cellulosic material. Its composition is predominantly 93% water and 7% solids. For each liter of alcohol... more
Abstract Vinasse is the final byproduct of biomass distillation, mainly from ethanol production from sugar and starch crops or cellulosic material. Its composition is predominantly 93% water and 7% solids. For each liter of alcohol produced in the sugarcane industry, 15 L of vinasse may be generated. This residue contains high levels of salt and organic contents. Disposal of sugarcane vinasse in soils and water bodies has caused environmental problems, mainly owing to salinization, the growing concentration of salts, and the change in pH levels. This practice alters the chemical and physicochemical properties of soils and water bodies with frequent discharges over a long period of time. Because of the large quantities of vinasse produced, alternative treatments and uses have been proposed, such as recycling vinasse in fermentation, fertirrigation, concentration by evaporation, and yeast and energy production. A few studies have been developed aimed at sugarcane vinasse recycling and appropriate disposal.
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This study is aimed to develop an electroanalytical methodology using a boron-doped diamond electrode (BDD) associated with experimental design in order to determine simultaneously and selectively carbendazin (CBZ) and fenamiphos (FNP)... more
This study is aimed to develop an electroanalytical methodology using a boron-doped diamond electrode (BDD) associated with experimental design in order to determine simultaneously and selectively carbendazin (CBZ) and fenamiphos (FNP) pesticides. In previous studies oxidation peaks were observed at 1.10 V (CBZ) and 1.20 V (FNP), respectively, with characteristics of irreversible processes controlled by diffusion of species (in pH 2.0 (CBZ) and pH 3.5 (FNP)) using a BR buffer 0.1 mol L−1 as support electrolyte. The differences between the potentials for both pesticides, (about 100 mV) indicate the possibility of selective determination of FNP and CBZ. However, employing an equimolar mixture of analytes, the peaks overlap to form a single oxidation peak. Thus, we used a 34 full factorial design with four parameters to be analyzed in three levels, in order to obtain the optimized parameters for the separation of the peaks. The best separation conditions were pH 5.0, square wave frequency of 300 s−1, pulse amplitude of 10 mV and scan increment of 2 mV. These parameters were used to obtain the calibration curves of CBZ and FNP. For CBZ the analytical curve was obtained in the concentration range of 4.95×10−6 to 6.90×10−5 mol L−1 with good sensitivity and linearity (0.175 A/mol L−1 and 0.999, respectively). The limits of detection (LOD) and quantification (LOQ) were 1.6×10−6 mol L−1 and 5.5×10−6 mol L−1, respectively. For FNP the linear concentration interval was 4.95×10−6 to 3.67×10−5 mol L−1, with a sensitivity of 0,207 A/mol L−1 and linearity of 0.996. The LOD and LOQ were 4.1×10−6 mol L−1 and 13.7×10−6 mol L−1, respectively. Using these experimental conditions it was possible to separate the oxidation peaks of CBZ (Ep=1.08 V) and FNP (Ep=1.23 V). The electroanlytical method was applied in lemon juice samples. The recovery values were 110.0 % and 92.5 % for CBZ and FNP, respectively. The results showed that the developed method is suitable for application in foodstuff samples.
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In this work the influence of four different ligands present in the xylem sap of Quercus ilex (histidine, citric, oxalic and aspartic acids) on Ni(II) adsorption by xylem was investigated. Grinded xylem was trapped in acrylic columns and... more
In this work the influence of four different ligands present in the xylem sap of Quercus ilex (histidine, citric, oxalic and aspartic acids) on Ni(II) adsorption by xylem was investigated. Grinded xylem was trapped in acrylic columns and solutions of Ni(II), in the absence and presence of the four ligands prepared in KNO(3) 0.1molL(-1) at pH 5.5, were percolated through the column. Aliquots of solutions were recovered in the column end for Ni determination by graphite furnace atomic absorption spectrometry (GFAAS). The experimental data to describe Ni sorption by xylem in both the presence and absence of ligands was better explained by the Freundlich isotherm model. The decreasing affinity order of ligands for Ni was: oxalic acid>citric acid>histidine>aspartic acid. On the other hand, the Ni(II) adsorption by xylem increased following the inverse sequence of ligands. Potentiometric titrations of acidic groups were carried out to elucidate the sorption site groups available in Q. ilex xylem. The potentiometric titration has shown three sorption sites: pK(a) 2.6 (57.7% of the sorption sites), related to monobasic aliphatic carboxylic acids or nitrogen aromatic bases, pK(a) 8.1 (9.6%) and pK(a) 9.9 (32.7%), related to phenolic groups.
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This work aimed to compare the allocation of Al, Fe, Cu, Ni, amino acids and sugars in different fractions of root cells of Paspalum notatum with 21 and 120 days old grown in quartz sand. In general younger roots showed a higher content... more
This work aimed to compare the allocation of Al, Fe, Cu, Ni, amino acids and sugars in different fractions of root cells of Paspalum notatum with 21 and 120 days old grown in quartz sand. In general younger roots showed a higher content of Al, Fe, Cu Ni, amino acids and sugars, compared to older roots. This can be due to a higher metabolic activity of younger roots and/or to structural changes that can occur with cell ageing. Al and Fe were mainly allocated to fractions with pectin, hemicellulose and cellulose, both in younger and older roots. However, older roots also showed a significant fraction of Al allocated to the intracellular fraction. It seems that older roots were less able to prevent the entry of Al in the cytoplasm. The proportion of Cu was higher in intracellular components, both in younger and older roots, as expected from an essential nutrient. Ni content was very low in older roots and in younger roots it was mainly allocated to the intracellular fraction and to the...
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Sugarcane bagasse and hydroponic lettuce roots were used as biosorbents for removal of Cu(II), Fe(II), Mn(II), and Zn(II) from multielement solutions, as well as from lake water, at pH 5.5, in batch processes. These biomasses were studied... more
Sugarcane bagasse and hydroponic lettuce roots were used as biosorbents for removal of Cu(II), Fe(II), Mn(II), and Zn(II) from multielement solutions, as well as from lake water, at pH 5.5, in batch processes. These biomasses were studied in natura (lettuce roots, NLR, and sugarcane bagasse, NSB) and chemically modified with HNO3 (lettuce roots, MLR, and sugarcane bagasse, MSB). The results showed that higher adsorption efficiency was achieved with the modified biomass, with the exception of lettuce roots, which also presented similar efficiency when used in natura. The maximum adsorption capacities (qmax) in multielement solution for Cu(II), Fe(II), Mn(II), and Zn(II) were 35.86, 31.42, 3.33, and 24.07 mg/g for NLR, 25.36, 27.95,14.06, and 6.43 mg/g for MLR, 0.92, 3.94, 0.03, and 0.18 mg/g for NSB, and 54.11, 6.52, 16.7, and 1.26 mg/g for MSB, respectively. In kinetic studies with modified biomasses, sorption was achieved in the first 5 min and reached equilibrium in 30 min. Modifi...
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Devido a presenca de ions metalicos em corpos hidricos, em concentracoes acima dos valores maximos permitidos aos seres vivos, faz-se necessario o desenvolvimento de metodos eficientes de remocao destes contaminantes em aguas. Este... more
Devido a presenca de ions metalicos em corpos hidricos, em concentracoes acima dos valores maximos permitidos aos seres vivos, faz-se necessario o desenvolvimento de metodos eficientes de remocao destes contaminantes em aguas. Este trabalho teve como objetivo o preparo, caracterizacao e emprego de biossorventes de raizes de alface (LR) in natura (NLR) e modificado quimicamente (MLR), impregnados com nanoparticulas ferromagneticas (Fe 3 O 4 ), na remocao de Cu(II) e Mn(II) em meio aquoso. Esses materiais foram caracterizados para investigacao dos grupos funcionais responsaveis pela sorcao destes ions metalicos (por espectroscopia no infravermelho, FTIR), e para se investigar a eficiencia de impregnacao das nanoparticulas em LR (por difratometria de raios X, DRX, e microscopia eletronica de varredura, MEV). Os estudos de sorcao foram realizados a 25 o C e pH 5,5 em procedimentos de batelada, dos quais os sobrenadantes foram analisados para determinacao de cobre e manganes por espe...
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Biosorption has become a viable and ecological process in which biological materials are employed as adsorbents for the removal of potentially toxic metals, such as hexavalent chromium, from aqueous matrices. This work proposed the use of... more
Biosorption has become a viable and ecological process in which biological materials are employed as adsorbents for the removal of potentially toxic metals, such as hexavalent chromium, from aqueous matrices. This work proposed the use of in natura (SB) and nanomodified sugarcane bagasse (SB-NP) with ferromagnetic nanoparticles (Fe 3 O 4 ) to adsorb Cr(VI) from water. These materials were analyzed by X-ray Spectroscopy (XRD), Scanning Electron Microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FTIR) to investigate their morphology and interaction with Cr(VI). It was observed the efficient impregnation of magnetite on the SB surface and the presence of functional groups such as O–H, C–H, C=O, C–O–C, C–O, and Fe–O (characteristic of magnetite). The best conditions for Cr(VI) removal in aqueous medium were determined by assessing the pH at the point of zero charge (pH PZC = 6.1 and 5.8 for SB and SB-NP, respectively), adsorption pH and kinetics, and adsorption capacity. Batch procedures were performed using increasing concentrations of Cr(VI), 10–100 mg/L at pH 1.0, and 30 min of contact time. The adsorbent dose was 10 mg/L, and the experimental adsorption capacities (SC exp ) for SB, NP, and SB-NP were 1.49 ± 0.06 mg/g, 2.48 ± 0.57 mg/g, and 1.60 ± 0.08 mg/g, respectively. All Cr contents were determined by flame atomic absorption spectrometry (FAAS). The pseudo-2nd-order kinetic equation provided the best adjustments with r 2 0.9966 and 0.9931 for SB and SB-NP, respectively. Six isotherm models (Langmuir, Freundlich, Sips, Temkin, Dubinin–Radushkevich, and Hill) were applied to the experimental data, and Freundlich, Dubinin–Radushkevich (D–R), and Temkin were the models that best described the experimental sorption process. The binding energy values ( E ) provided by the D–R model were 0.11 ± 0.25, 0.09 ± 0.20, and 0.08 ± 0.25 kJ/mol, for NP, SB-NP, and SB, respectively, and denote a physical interaction for the studied adsorbate–adsorbent system. The nanomodification of the biomass slightly improved the efficiency for the sorption of Cr(VI) and facilitated the removal of Cr(VI)-containing biosorbents from water medium.
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Oil spill is a serious environmental concern, and alternatives to remove oils from water involving biosorbents associated to nanoparticles is an emerging subject. Magnetite nanoparticles (MNP) and yeast magnetic bionanocomposite (YB-MNP)... more
Oil spill is a serious environmental concern, and alternatives to remove oils from water involving biosorbents associated to nanoparticles is an emerging subject. Magnetite nanoparticles (MNP) and yeast magnetic bionanocomposite (YB-MNP) composed by yeast biomass from the ethanol industry were produced, characterized, and tested to remove new motor oil (NMO), mixed used motor oil (MUMO) and Petroleum 28 °API (P28API) from water following the ASTM F726-12 method, which was adapted by insertion of a lyophilization step to ensure the accuracy of the gravimetric approach. Temperature, contact time, the type and the amount of the magnetic material were the parameters evaluated employing a fractional factorial design. It was observed the removal of 89.0 ± 2.6% or 3522 ± 118 g/kg (NMO) employing MNP; 69.1 ± 6.2% or 2841 ± 280 g/kg (MUMO) with YB-MNP; and 55.3 ± 8.2% or 2157 ± 281 g/kg (P28API) using MNP. The temperature was the most significant parameter in accordance with the Pareto's...
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Research Interests: Microbiology and Lead
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A high cost-effective treatment of sulphochromic waste is proposed employing a raw coconut coir as biosorbent for Cr(VI) removal. The ideal pH and sorption kinetic, sorption capacities, and sorption sites were the studied biosorbent... more
A high cost-effective treatment of sulphochromic waste is proposed employing a raw coconut coir as biosorbent for Cr(VI) removal. The ideal pH and sorption kinetic, sorption capacities, and sorption sites were the studied biosorbent parameters. After testing five different isotherm models with standard solutions, Redlich-Peterson and Toth best fitted the experimental data, obtaining a theoretical Cr(VI) sorption capacity (SC) of 6.3 mg g(-1). Acid-base potentiometric titration indicated around of 73% of sorption sites were from phenolic compounds, probably lignin. Differences between sorption sites in the coconut coir before and after Cr adsorption identified from Fourier transform infrared spectra suggested a modification of sorption sites after sulphochromic waste treatment, indicating that the sorption mechanism involves organic matter oxidation and chromium uptake. For sulphocromic waste treatment, the SC was improved to 26.8+/-0.2 mg g(-1), and no adsorbed Cr(VI) was reduced, remaining only Cr(III) in the final solution. The adsorbed material was calcinated to obtain Cr(2)O(3,) with a reduction of more than 60% of the original mass.
Research Interests: Engineering, Kinetics, Modeling, Adsorption, Ph, and 15 moreCocos, Hazardous Materials, Chromium, Absorption, Cost effectiveness, Laboratories, Phenolic compound, Hazardous, Cost Benefit Analysis, Oxidation, Organic Matter, Potentiometric Titration, Experimental Data, Chromium Compounds, and Fourier transform infrared
Despite the advances in microwave‐assisted procedures, the sample throughput still remains a critical problem that requires the development of reactor vessels, rotors, and procedures able to deal with a large number of samples... more
Despite the advances in microwave‐assisted procedures, the sample throughput still remains a critical problem that requires the development of reactor vessels, rotors, and procedures able to deal with a large number of samples simultaneously. In this work, a 36‐vessel rotor was combined with diluted nitric acid solution for digestion of agricultural materials. Accurate results were obtained for aluminum (Al), calcium (Ca), copper (Cu), iron (Fe), potassium (K), magnesium (Mg), manganese (Mn), phosphorus (P), and zinc (Zn) in bovine liver and spinach leaves standard reference materials. The EPA‐3051 method was also evaluated using this system. The procedure led to quantitative recoveries of chromium (Cr), Cu, Mn, nickel (Ni), and Zn in soil. All measurements were carried out using inductively coupled plasma—optical emission spectrometry (ICP‐OES). The main advantages of the proposed procedures are the increase of sample throughput in microwave‐assisted digestions or extractions and the lower dilution required before pneumatic nebulization of digests obtained by using dilute nitric acid.
Research Interests: Plant Biology, Phosphorus, Magnesium, Copper, Chromium, and 7 moreZinc, Iron, Potassium, Nickel, Soil sciences, Very high throughput, and NITRIC ACID
In this work Paspalum notatum root material was used to elucidate the influence of acid leaching pre-treatment and of sorption medium on metal adsorption. Ground P. notatum root was leached with 0.14M HNO(3). Leached root material (LRM)... more
In this work Paspalum notatum root material was used to elucidate the influence of acid leaching pre-treatment and of sorption medium on metal adsorption. Ground P. notatum root was leached with 0.14M HNO(3). Leached root material (LRM) and non-leached root material (NLRM) were employed to flow sorption of Ni(II), Cu(II), Al(III) and Fe(III) in 0.5M CH(3)COONH(4) medium at pH 6.5. For LRM the sorption was also studied in 0.5M KNO(3) medium. The acid pre-treatment increased the sorption capacity (SC) for all ions studied. For the KNO(3) medium, Cu(II) and Fe(III) sorption was higher than in CH(3)COONH(4) and the type of the Ni(II) isotherm's model changed. The Freundlich model was the most representative isotherm model to describe metallic ions sorption. The (1)H NMR spectra showed differences between LRM and NLRM and the acid-basic potentiometric titration elucidated that acid-leaching procedure affected the root material sorption sites once only two predominant sorption sites were found for LRM (phenolic and amine, both able cations sorption) and five sorption sites (two carboxylic, amine and two phenolic) were founded for NLRM.
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Organic agro-industrial residues have been successfully used as biosorbents and promoting new uses from agricultural wastes benefits the economy. However, the allocation of a solid waste biosorbent after the sorption of contaminants has... more
Organic agro-industrial residues have been successfully used as biosorbents and promoting new uses from agricultural wastes benefits the economy. However, the allocation of a solid waste biosorbent after the sorption of contaminants has limited their effective application on a large scale as an alternative treatment of water and wastewaters. One solution could be degradation to convert the biosorbent material and adsorbed organic contaminants into environmental friendly compounds suitable for discharge. This study used an experimental design to evaluate the Fenton degradation of yeast biomass (YB) from the alcohol industry as a potential biosorbent. The efficiency of degradation was monitored according to the degraded mass (DM) and total organic carbon (TOC) remaining in the solution. The ANOVA showed an error of 9.7% for the effects and the media of interaction for the employed model for DM. Conducting the experiments with the best-predicted conditions (60 min, 25 g of YB, pH 3, 8,000 mg L-1 H2O2 and 40 mg L-1 Fe 2+) with 30 W UV irradiation resulted in a YB reduction of 72 2% with a TOC of 30 2%. This suggests that an advanced oxidative process is an alternative for degradation of a biosorbent after sorption.