Pub Date : 2019-01-01DOI: 10.22104/AET.2019.3561.1176
P. Roohi, E. Fatehifar
In this work, the fast remediation of tert-butyl mercaptan from the polluted soil via a bimetallic Fenton treatment that included Fe2+/Fe3+/Fe0/Cu2+ in the presence of gasoline was studied. The analysis of variance and the Pareto analysis resulting from the central composite design (CCD) showed that the H2O2, CuSO4, Fe3O4 nanoparticles, nano zerovalent iron (nZVI), and gasoline initial concentrations as a secondary contaminant were influential factors on the removal efficiency of tert-butyl mercaptan (with an effectiveness of 2.09%, 13.38%, 1.92%, 2.01%, and 39.73% respectively). Moreover, the interaction of H2O2/nZVI, H2O2/nFe3O4, H2O2/CuSO4, nZVI/nFe3O4, and nZVI/CuSO4 had a positive effect on removal efficiency, while nFe3O4/CuSO4 had a negative one. Surprisingly, the mixing of nZVI and nFe3O4 before adding them to the reactor did not affect the removal efficiency. The optimum conditions suggested for the maximum removal efficiency of tert-butyl mercaptan were the minimum levels of the initial gasoline concentration (2.5 %w/w), a maximum level of CuSO4 (0.12 %w/w), and an optimum concentration of H2O2, nano-ZVI, and nano-Fe3O4 (8.92 %w/v, 0.1194 %w/w and 0.0898 %w/w, respectively) in the studied intervals. This condition led to a 99.27% efficiency removal of tert-butyl mercaptan removal in 20 minutes without pH and temperature adjustments.
{"title":"Fast and environmental-friendly degradation of tert-butyl mercaptan from contaminated soil using bimetallic-modified Fenton process","authors":"P. Roohi, E. Fatehifar","doi":"10.22104/AET.2019.3561.1176","DOIUrl":"https://doi.org/10.22104/AET.2019.3561.1176","url":null,"abstract":"In this work, the fast remediation of tert-butyl mercaptan from the polluted soil via a bimetallic Fenton treatment that included Fe2+/Fe3+/Fe0/Cu2+ in the presence of gasoline was studied. The analysis of variance and the Pareto analysis resulting from the central composite design (CCD) showed that the H2O2, CuSO4, Fe3O4 nanoparticles, nano zerovalent iron (nZVI), and gasoline initial concentrations as a secondary contaminant were influential factors on the removal efficiency of tert-butyl mercaptan (with an effectiveness of 2.09%, 13.38%, 1.92%, 2.01%, and 39.73% respectively). Moreover, the interaction of H2O2/nZVI, H2O2/nFe3O4, H2O2/CuSO4, nZVI/nFe3O4, and nZVI/CuSO4 had a positive effect on removal efficiency, while nFe3O4/CuSO4 had a negative one. Surprisingly, the mixing of nZVI and nFe3O4 before adding them to the reactor did not affect the removal efficiency. The optimum conditions suggested for the maximum removal efficiency of tert-butyl mercaptan were the minimum levels of the initial gasoline concentration (2.5 %w/w), a maximum level of CuSO4 (0.12 %w/w), and an optimum concentration of H2O2, nano-ZVI, and nano-Fe3O4 (8.92 %w/v, 0.1194 %w/w and 0.0898 %w/w, respectively) in the studied intervals. This condition led to a 99.27% efficiency removal of tert-butyl mercaptan removal in 20 minutes without pH and temperature adjustments.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"12 1","pages":"9-21"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83189337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.22104/AET.2019.3647.1178
F. Mehri, S. Rowshanzamir
The desulfurization-hydrogenation of thiophene and benzothiophene in hexadecane as a model diesel fuel was studied through a divided cell with the incorporation of a membrane electrode assembly (MEA) under different current density at a constant charge. The reduction of the thiophenic compounds was investigated using a prepared MoS2 nano-electrocatalyst, Nafion (commercial proton exchange membrane), and synthesized sulfonated poly ether ether ketone (SPEEK). Field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) were used to characterize the MoS2 electrocatalyst, which confirmed the formation of 23-25 nm ball-like nano-threads of MoS2. Also, the electrocatalyst and/or MEA was electrochemically analyzed by cyclic voltammetry (CV), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS). The gas chromatography-mass spectroscopy (GC-MS) analysis of the reactants and products revealed the direct desulfurization on the thiophene reduction process and the desulfurization along with the desulfurization pathway on the benzothiophene reduction experiment. A maximum desulfurization efficiency of 79.6% at 20 mA cm-2 and 51.5% at 30 mA cm-2 under the constant charge of 300 C was obtained for thiophene using the MoS2-Nafion and MoS2-SPEEK system, respectively. Moreover, a maximum hydrogenation and desulfurization efficiency of 28% and 59.1% occurred at 50 mA cm-2 and 70 mA cm-2, respectively, for the benzohiophene-Nafion system under the constant charge of 400 C. The distribution of the products affirmed that the desulfurization reaction contributed more at a higher current density against the hydrogenation process at a lower current density.
以十六烷为模型柴油，采用膜电极组件(MEA)，研究了不同电流密度和恒电荷条件下噻吩和苯并噻吩的脱硫加氢反应。利用制备的二硫化钼纳米电催化剂Nafion(商业质子交换膜)对噻吩类化合物进行了还原，合成了磺化聚醚醚酮(SPEEK)。采用场发射扫描电镜(FESEM)和x射线衍射仪(XRD)对二硫化钼电催化剂进行了表征，证实二硫化钼形成了23-25 nm的球状纳米线。采用循环伏安法(CV)、线性扫描伏安法(LSV)和电化学阻抗谱(EIS)对电催化剂和/或MEA进行了电化学分析。通过气相色谱-质谱(GC-MS)对反应物和产物进行分析，发现噻吩还原过程中存在直接脱硫，苯并噻吩还原实验中存在沿脱硫途径脱硫。采用MoS2-Nafion和MoS2-SPEEK体系，在300℃恒充电条件下，噻吩在20 mA cm-2和30 mA cm-2条件下的最大脱硫效率分别为79.6%和51.5%。在400℃恒荷下，苯并噻吩- nafion体系在50 mA cm-2和70 mA cm-2时的加氢和脱硫效率最高，分别为28%和59.1%。产物分布证实了高电流密度下的脱硫反应比低电流密度下的加氢反应贡献更大。
{"title":"Electrochemical hydrogenation and desulfurization of thiophenic compounds over MoS2 electrocatalyst using different membrane-electrode assembly","authors":"F. Mehri, S. Rowshanzamir","doi":"10.22104/AET.2019.3647.1178","DOIUrl":"https://doi.org/10.22104/AET.2019.3647.1178","url":null,"abstract":"The desulfurization-hydrogenation of thiophene and benzothiophene in hexadecane as a model diesel fuel was studied through a divided cell with the incorporation of a membrane electrode assembly (MEA) under different current density at a constant charge. The reduction of the thiophenic compounds was investigated using a prepared MoS2 nano-electrocatalyst, Nafion (commercial proton exchange membrane), and synthesized sulfonated poly ether ether ketone (SPEEK). Field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) were used to characterize the MoS2 electrocatalyst, which confirmed the formation of 23-25 nm ball-like nano-threads of MoS2. Also, the electrocatalyst and/or MEA was electrochemically analyzed by cyclic voltammetry (CV), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS). The gas chromatography-mass spectroscopy (GC-MS) analysis of the reactants and products revealed the direct desulfurization on the thiophene reduction process and the desulfurization along with the desulfurization pathway on the benzothiophene reduction experiment. A maximum desulfurization efficiency of 79.6% at 20 mA cm-2 and 51.5% at 30 mA cm-2 under the constant charge of 300 C was obtained for thiophene using the MoS2-Nafion and MoS2-SPEEK system, respectively. Moreover, a maximum hydrogenation and desulfurization efficiency of 28% and 59.1% occurred at 50 mA cm-2 and 70 mA cm-2, respectively, for the benzohiophene-Nafion system under the constant charge of 400 C. The distribution of the products affirmed that the desulfurization reaction contributed more at a higher current density against the hydrogenation process at a lower current density.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"2 1","pages":"23-33"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87737538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.22104/AET.2020.3952.1196
M. Farhadian, Negin Entezami, N. Davari
A TiO2/Fe2O3/GO photocatalyst is synthesized via the sol-gel method and characterized by X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), FT-IR, Brunauer-Emmett-Teller (BET), and Ultraviolet-Visible Diffuse Reflection Spectroscopy (UV-Vis DRS) analyses. Metronidazole (MET) concentration (10-20 mg/L), photocatalyst concentration (0.5-1.5 g/L), irradiation time (60-120 min), and initial pH (4-6) are investigated through response surface methodology (RSM), and the optimal process conditions are determined. The removal efficiency of MET with the TiO2/Fe2O3/GO photocatalyst is 97% under optimal conditions: a pollutant concentration of 10 mg/L, the irradiation time of 120 min, photocatalyst concentration of 1 g/L, and pH of 5. The influence of mineral salts concentrations (50-800 mg/L), including NaCl, Na2SO4, NaHCO3, KCl, MgSO4, and CaCl2, are examined at the initial pH of 5, photocatalyst concentration of 1 g/L, and pollutant concentration of 20 mg/L. According to the results, the reaction rate constant decreases with an increase in mineral salts concentrations up to 800 mg/L, especially with Na2SO4 (42.43% deactivation) and also with MgSO4 (38.08%) and NaHCO3 (37.73%), under the same operational conditions. The effects of mineral salts such as NaCl and KCl on the reaction rate constant for the contaminant removal efficiency have a downward trend until these salts reach a 200 mg/L concentration, and then they experience an upward trend.
{"title":"Removal of metronidazole antibiotic pharmaceutical from aqueous solution using TiO2/Fe2O3/GO photocatalyst: Experimental study on the effects of mineral salts","authors":"M. Farhadian, Negin Entezami, N. Davari","doi":"10.22104/AET.2020.3952.1196","DOIUrl":"https://doi.org/10.22104/AET.2020.3952.1196","url":null,"abstract":"A TiO2/Fe2O3/GO photocatalyst is synthesized via the sol-gel method and characterized by X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), FT-IR, Brunauer-Emmett-Teller (BET), and Ultraviolet-Visible Diffuse Reflection Spectroscopy (UV-Vis DRS) analyses. Metronidazole (MET) concentration (10-20 mg/L), photocatalyst concentration (0.5-1.5 g/L), irradiation time (60-120 min), and initial pH (4-6) are investigated through response surface methodology (RSM), and the optimal process conditions are determined. The removal efficiency of MET with the TiO2/Fe2O3/GO photocatalyst is 97% under optimal conditions: a pollutant concentration of 10 mg/L, the irradiation time of 120 min, photocatalyst concentration of 1 g/L, and pH of 5. The influence of mineral salts concentrations (50-800 mg/L), including NaCl, Na2SO4, NaHCO3, KCl, MgSO4, and CaCl2, are examined at the initial pH of 5, photocatalyst concentration of 1 g/L, and pollutant concentration of 20 mg/L. According to the results, the reaction rate constant decreases with an increase in mineral salts concentrations up to 800 mg/L, especially with Na2SO4 (42.43% deactivation) and also with MgSO4 (38.08%) and NaHCO3 (37.73%), under the same operational conditions. The effects of mineral salts such as NaCl and KCl on the reaction rate constant for the contaminant removal efficiency have a downward trend until these salts reach a 200 mg/L concentration, and then they experience an upward trend.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"25 1","pages":"55-65"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84370077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.22104/AET.2019.3730.1183
M. S. Hesarian, J. Tavoosi
The wrinkling of cotton fabric is an important factor that affects a garment's appearance. This paper evaluated the use of a non-toxic green anti-wrinkle material in the finishing process to address this issue. For this purpose, the chemical structure of the wrinkled cotton sample was evaluated and treated with a scouring and anti-creasing finishing material. Due to the environmental issues created by the toxic material used as finishes, the type of anti-wrinkle material used in this study had the least possible environmental impact. The mechanism of this anti-crease finishing was based on the crosslinking of cellulose molecular chains. This process limited the chain movements made by wrinkling. Accordingly, the effect of the mentioned mechanism and structural parameters such as the thickness, weight, density of the weft yarn, and linear density of the weft yarn (Ne) were evaluated. The wrinkle degree of the samples was analyzed by using a radial basis function neural network (RBFN). This RBFN modeled the relationships between the degree of wrinkling in the fabrics and the mentioned parameters, especially the anti-crease finishing of the samples. The simulation results confirmed the effectiveness of the proposed method.
{"title":"Green Technology used in Finishing Process Study of the Wrinkled Cotton Fabric by Radial Basis Function neurons. (Experimental and Modeling analysis)","authors":"M. S. Hesarian, J. Tavoosi","doi":"10.22104/AET.2019.3730.1183","DOIUrl":"https://doi.org/10.22104/AET.2019.3730.1183","url":null,"abstract":"The wrinkling of cotton fabric is an important factor that affects a garment's appearance. This paper evaluated the use of a non-toxic green anti-wrinkle material in the finishing process to address this issue. For this purpose, the chemical structure of the wrinkled cotton sample was evaluated and treated with a scouring and anti-creasing finishing material. Due to the environmental issues created by the toxic material used as finishes, the type of anti-wrinkle material used in this study had the least possible environmental impact. The mechanism of this anti-crease finishing was based on the crosslinking of cellulose molecular chains. This process limited the chain movements made by wrinkling. Accordingly, the effect of the mentioned mechanism and structural parameters such as the thickness, weight, density of the weft yarn, and linear density of the weft yarn (Ne) were evaluated. The wrinkle degree of the samples was analyzed by using a radial basis function neural network (RBFN). This RBFN modeled the relationships between the degree of wrinkling in the fabrics and the mentioned parameters, especially the anti-crease finishing of the samples. The simulation results confirmed the effectiveness of the proposed method.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"42 1","pages":"35-45"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74845929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.22104/AET.2019.3559.1175
Samereh Eskandarya, S. Maghsoodi, A. S. Kootenaei
In this study, La–Mn–Cr perovskite-type catalysts were synthesized as LaMnO3,LaCrO3, and LaMn0.5Cr0.5O3 by a microwave-assisted gel-combustion method. They were then calcined at 600oC for 5h in air. X-ray diffraction (XRD) analysis indicated that the crystalline perovskite phase is the dominant phase formed in all the synthesized samples. The scanning electron microscopy (SEM) analysis showed that the perovskites have a full spongy and porous structure. The specific surface area (BET) analysis showed a specific surface area of about 12.4-26.8 m2/g, and the highest specific surface area belonged to the LaMn0.5Cr0.5O3 perovskite. Moreover, the highest oxygen mobility revealed by the temperature-programmed desorption of oxygen (O2–TPD) analysis was related to the LaMn0.5Cr0.5O3 sample. The catalytic activity of the synthesized perovskites in catalytic oxidation of 1000 ppm trichloroethylene (TCE) in air was investigated at different temperatures. The substituted perovskite (LaMn0.5Cr0.5O3) with the highest BET specific surface area and the highest oxygen mobility yielded the best catalytic performance among the probed perovskites.
{"title":"Evaluation of LaBO3 (B=Mn, Cr, Mn0.5Cr0.5) perovskites in catalytic oxidation of trichloroethylene","authors":"Samereh Eskandarya, S. Maghsoodi, A. S. Kootenaei","doi":"10.22104/AET.2019.3559.1175","DOIUrl":"https://doi.org/10.22104/AET.2019.3559.1175","url":null,"abstract":"In this study, La–Mn–Cr perovskite-type catalysts were synthesized as LaMnO3,LaCrO3, and LaMn0.5Cr0.5O3 by a microwave-assisted gel-combustion method. They were then calcined at 600oC for 5h in air. X-ray diffraction (XRD) analysis indicated that the crystalline perovskite phase is the dominant phase formed in all the synthesized samples. The scanning electron microscopy (SEM) analysis showed that the perovskites have a full spongy and porous structure. The specific surface area (BET) analysis showed a specific surface area of about 12.4-26.8 m2/g, and the highest specific surface area belonged to the LaMn0.5Cr0.5O3 perovskite. Moreover, the highest oxygen mobility revealed by the temperature-programmed desorption of oxygen (O2–TPD) analysis was related to the LaMn0.5Cr0.5O3 sample. The catalytic activity of the synthesized perovskites in catalytic oxidation of 1000 ppm trichloroethylene (TCE) in air was investigated at different temperatures. The substituted perovskite (LaMn0.5Cr0.5O3) with the highest BET specific surface area and the highest oxygen mobility yielded the best catalytic performance among the probed perovskites.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"41 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83719118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-24DOI: 10.22104/AET.2018.2521.1127
A. Habibi, Khatereh Narimanirad
{"title":"Effects of Mass Transfer on Biodegradation of Methylene blue in Kissiris-Immobilized Cell Bioreactor","authors":"A. Habibi, Khatereh Narimanirad","doi":"10.22104/AET.2018.2521.1127","DOIUrl":"https://doi.org/10.22104/AET.2018.2521.1127","url":null,"abstract":"","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91526251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this research, commercial nano-clay (NC) was modified with TiO2 functional groups and characterized via XRD and FTIR methods. The modified nano-clay was applied as an adsorbent for the removal of cadmium from wastewater solutions. The effects of the operating parameters including initial pH, cadmium concentration and adsorbent concentration were analyzed by the Taguchi method. The optimum conditions for cadmium removal by the nanoclay/TiO2 composite were an initial feed pH of 6, an initial concentration of 30 mg/L, and an adsorbent concentration of 4.5 g/L. Under these conditions, nearly 90% of the cadmium ions were removed by modified nano-clay after one hour. The equilibrium results showed that the Freundlich model could well fit the experimental data, and this indicated the multilayer adsorption process. The adsorption capacity of the nano-clay for cadmium improved from 8.92 mg/g to 16.20 mg/g by modification with TiO2. The kinetic data were analyzed using the pseudo-first order, pseudo-second-order, and intraparticle kinetics models. Thermodynamic studies indicated the exothermic and spontaneously nature of the adsorption process.
{"title":"Cadmium removal from wastewater using nano-clay/TiO2 composite: kinetics, equilibrium and thermodynamic study","authors":"Hakimeh Sharififard, mohaddeseh Ghorbanpour, Somayeh Hosseinirad","doi":"10.22104/AET.2019.3029.1149","DOIUrl":"https://doi.org/10.22104/AET.2019.3029.1149","url":null,"abstract":"In this research, commercial nano-clay (NC) was modified with TiO2 functional groups and characterized via XRD and FTIR methods. The modified nano-clay was applied as an adsorbent for the removal of cadmium from wastewater solutions. The effects of the operating parameters including initial pH, cadmium concentration and adsorbent concentration were analyzed by the Taguchi method. The optimum conditions for cadmium removal by the nanoclay/TiO2 composite were an initial feed pH of 6, an initial concentration of 30 mg/L, and an adsorbent concentration of 4.5 g/L. Under these conditions, nearly 90% of the cadmium ions were removed by modified nano-clay after one hour. The equilibrium results showed that the Freundlich model could well fit the experimental data, and this indicated the multilayer adsorption process. The adsorption capacity of the nano-clay for cadmium improved from 8.92 mg/g to 16.20 mg/g by modification with TiO2. The kinetic data were analyzed using the pseudo-first order, pseudo-second-order, and intraparticle kinetics models. Thermodynamic studies indicated the exothermic and spontaneously nature of the adsorption process.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"84 1","pages":"203-209"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78977778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.22104/AET.2019.3397.1169
H. Sarlak, A. Azimi, mostafa tabatabaee ghomshe, M. Mirzaei
Gas consumption rate is an important factor in the kinetic study of gas hydrate formation. In this study, the kinetic of the hydrate formation was examined in water + carbon dioxide + graphene oxide and water + carbon dioxide + graphene oxide + sodium dodecyl sulfate (SDS) systems. The experiments are carried out at 0.05 and 0.1%of graphene oxide nanoparticle weight and 400 PPM SDS solution at 3.6 MPa and 4 MPa pressures and temperatures of 275.65, 277.65, and 279.65 K. The results show that as the pressure rises, graphene oxide is responsible for the increase in the storage capacity and gas consumption at constant temperature so that using graphene oxide at 0.1% weight increases the storage capacity by 4.2% and molar gas consumption by 3.8% at the pressure of 3.4 MPa compared to the 0.1% weight. When the surfactant, SDS with the concentration of 400 ppm, is used, storage capacity and gas consumption increase by 38% and 26%, respectively.
{"title":"Thermodynamic study of CO2 hydrate formation in the presence of SDS and graphene oxide nanoparticles","authors":"H. Sarlak, A. Azimi, mostafa tabatabaee ghomshe, M. Mirzaei","doi":"10.22104/AET.2019.3397.1169","DOIUrl":"https://doi.org/10.22104/AET.2019.3397.1169","url":null,"abstract":"Gas consumption rate is an important factor in the kinetic study of gas hydrate formation. In this study, the kinetic of the hydrate formation was examined in water + carbon dioxide + graphene oxide and water + carbon dioxide + graphene oxide + sodium dodecyl sulfate (SDS) systems. The experiments are carried out at 0.05 and 0.1%of graphene oxide nanoparticle weight and 400 PPM SDS solution at 3.6 MPa and 4 MPa pressures and temperatures of 275.65, 277.65, and 279.65 K. The results show that as the pressure rises, graphene oxide is responsible for the increase in the storage capacity and gas consumption at constant temperature so that using graphene oxide at 0.1% weight increases the storage capacity by 4.2% and molar gas consumption by 3.8% at the pressure of 3.4 MPa compared to the 0.1% weight. When the surfactant, SDS with the concentration of 400 ppm, is used, storage capacity and gas consumption increase by 38% and 26%, respectively.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"61 1","pages":"233-240"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86888553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.22104/AET.2019.3251.1160
M. Pazoki, F. Rahnama, R. Abbaszadeh, Ehsan mirabdollah
In today's world, the production of hospital wastes and their adverse effects such as infectious outbreaks and resistance to treatment is an important issue. Therefore, it's vital to find a new and efficient method to manage such wastes. In this study, the ability of dielectric barrier discharge (DBD) plasma to deactivate Pseudomonas aeruginosa and Staphylococcus aureus bacteria was assessed. The bacteria were treated with DBD plasma after cultivation in liquid milieu, and then dried in a sterile air stream. The results showed that for both bacteria, the number of deactivated colonies increased proportionally to the time of treatment. First, it occurred rapidly, and then the number of active colonies decreased at a slower speed. Also, increasing the plasma duty cycle in the same treatment time led to more deactivated colonies. This increase was more significant in the Pseudomonas aeruginosa bacteria, and changes for the Staphylococcus aureus was slight.
{"title":"Assessment of anti-bacterial activity of non-thermal plasma in sterilization of infectious wastes","authors":"M. Pazoki, F. Rahnama, R. Abbaszadeh, Ehsan mirabdollah","doi":"10.22104/AET.2019.3251.1160","DOIUrl":"https://doi.org/10.22104/AET.2019.3251.1160","url":null,"abstract":"In today's world, the production of hospital wastes and their adverse effects such as infectious outbreaks and resistance to treatment is an important issue. Therefore, it's vital to find a new and efficient method to manage such wastes. In this study, the ability of dielectric barrier discharge (DBD) plasma to deactivate Pseudomonas aeruginosa and Staphylococcus aureus bacteria was assessed. The bacteria were treated with DBD plasma after cultivation in liquid milieu, and then dried in a sterile air stream. The results showed that for both bacteria, the number of deactivated colonies increased proportionally to the time of treatment. First, it occurred rapidly, and then the number of active colonies decreased at a slower speed. Also, increasing the plasma duty cycle in the same treatment time led to more deactivated colonies. This increase was more significant in the Pseudomonas aeruginosa bacteria, and changes for the Staphylococcus aureus was slight.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"1 1","pages":"197-202"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89327711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-10-01DOI: 10.22104/AET.2019.3324.1164
Hadis Shooshtary, L. Hajiaghababaei, Alireza Badiei, M. Ganjali, Ghodsi Mohammadi Ziarani
The present work focuses on the synthesis and application of imine-modified silica-coated magnetic (IM-SCM) nanoparticles. The X-ray diffraction (XRD) tests indicated the presence of highly crystalline cubic spinel magnetite both before and after coating with the silica. The FTIR spectra also proved the successful surface coating and imine-modification of the Fe3O4 nanoparticles. Further investigations were performed to examine the capability of the modified IM-SCM nanoparticles for simultaneous removal of Ag+ and Cu2+ from the water samples. Atomic absorption spectrometry was used for ion determination. The best operating conditions for removing the target ions were a pH=5-9 and a stirring time=30 min. Only 20 mL of 3M nitric acid was used for stripping the ions using the IM-SCM nanoparticles. The resulting data were found to fit well with the Langmuir model, and the maximum capacity of the adsorbent was determined to be 270.3 (± 1.4) mg and 256.4 (± 0.9) mg of Ag+ and Cu2+ /g of IM-SCM, respectively. The adsorbent was successfully used for simultaneously removing the target ions from the wastewater samples.
本文主要研究了亚胺改性二氧化硅包覆磁性纳米粒子的合成与应用。x射线衍射(XRD)测试表明，二氧化硅包覆前后均存在高结晶的立方尖晶石磁铁矿。FTIR光谱也证实了Fe3O4纳米颗粒表面包覆和亚胺修饰的成功。进一步研究了改性IM-SCM纳米颗粒同时去除水样中Ag+和Cu2+的能力。离子测定采用原子吸收光谱法。去除目标离子的最佳操作条件为pH=5-9，搅拌时间=30 min。使用IM-SCM纳米颗粒，仅使用20 mL 3M硝酸剥离离子。所得数据与Langmuir模型拟合良好，吸附量分别为270.3(±1.4)mg /g Ag+和256.4(±0.9)mg /g cu +。该吸附剂成功地同时去除了废水样品中的目标离子。
{"title":"Efficient removal of Ag+ and Cu2+ using imine-modified/mesoporous silica-coated magnetic nanoparticles","authors":"Hadis Shooshtary, L. Hajiaghababaei, Alireza Badiei, M. Ganjali, Ghodsi Mohammadi Ziarani","doi":"10.22104/AET.2019.3324.1164","DOIUrl":"https://doi.org/10.22104/AET.2019.3324.1164","url":null,"abstract":"The present work focuses on the synthesis and application of imine-modified silica-coated magnetic (IM-SCM) nanoparticles. The X-ray diffraction (XRD) tests indicated the presence of highly crystalline cubic spinel magnetite both before and after coating with the silica. The FTIR spectra also proved the successful surface coating and imine-modification of the Fe3O4 nanoparticles. Further investigations were performed to examine the capability of the modified IM-SCM nanoparticles for simultaneous removal of Ag+ and Cu2+ from the water samples. Atomic absorption spectrometry was used for ion determination. The best operating conditions for removing the target ions were a pH=5-9 and a stirring time=30 min. Only 20 mL of 3M nitric acid was used for stripping the ions using the IM-SCM nanoparticles. The resulting data were found to fit well with the Langmuir model, and the maximum capacity of the adsorbent was determined to be 270.3 (± 1.4) mg and 256.4 (± 0.9) mg of Ag+ and Cu2+ /g of IM-SCM, respectively. The adsorbent was successfully used for simultaneously removing the target ions from the wastewater samples.","PeriodicalId":7295,"journal":{"name":"Advances in environmental science and technology","volume":"24 1","pages":"223-231"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73993714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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