Abstract Latex (LX) paint was tested for photocatalytic decomposition of benzo[a]pyrene (BaP) under different conditions of relative humidity (RH), temperature and irradiation. Porcelain trays coated with LX paint were loaded with BaP solution, which was dissolved in acetonitrile. Trays were placed inside the photoreactor and irradiated with UV or a fluorescent lamp. Different conditions of RH and temperature inside the photoreactor were used. BaP preliminarily adsorbed on LX paint surface was decomposed faster at higher temperature and lower RH. For example, at 42 °C and RH 20 % BaP decomposition rate reached 64 %. At same temperature and with RH of 80 % this rate decreased to only 42 %. It was also demonstrated that at high RH (80 %) and under UV irradiation water contact angle on the paint surface was decreasing at a lower rate than under RH of 20 %. It was also proven that BaP could be sufficiently decomposed under irradiation by fluorescent lamp (59 % in comparison to 64 % under same environmental conditions with use of UV light). However, its decomposition rate was approximately 5 times slower than under UV light
{"title":"Application of photocatalytic paint for destruction of benzo[a]pyrene. Impact of air humidity","authors":"P. Homa, B. Tryba","doi":"10.1515/jaots-2016-0182","DOIUrl":"https://doi.org/10.1515/jaots-2016-0182","url":null,"abstract":"Abstract Latex (LX) paint was tested for photocatalytic decomposition of benzo[a]pyrene (BaP) under different conditions of relative humidity (RH), temperature and irradiation. Porcelain trays coated with LX paint were loaded with BaP solution, which was dissolved in acetonitrile. Trays were placed inside the photoreactor and irradiated with UV or a fluorescent lamp. Different conditions of RH and temperature inside the photoreactor were used. BaP preliminarily adsorbed on LX paint surface was decomposed faster at higher temperature and lower RH. For example, at 42 °C and RH 20 % BaP decomposition rate reached 64 %. At same temperature and with RH of 80 % this rate decreased to only 42 %. It was also demonstrated that at high RH (80 %) and under UV irradiation water contact angle on the paint surface was decreasing at a lower rate than under RH of 20 %. It was also proven that BaP could be sufficiently decomposed under irradiation by fluorescent lamp (59 % in comparison to 64 % under same environmental conditions with use of UV light). However, its decomposition rate was approximately 5 times slower than under UV light","PeriodicalId":14870,"journal":{"name":"Journal of Advanced Oxidation Technologies","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82396156","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}
Abstract Wet oxidation of an industrial pharmaceutical wastewater with high concentration organic pollutants using hydrogen peroxide as an oxidant was investigated. Experiments were performed in a batch reactor to discuss the effects of reaction temperature, time, the hydrogen peroxide amount and catalyst with COD removal rate as an evaluation index. Results show that the highest COD removal rate, 81.6 %, was achieved at 240 ºC for 60 min with the addition of H2O2 solution 2 mL. The increased B/C value illustrated that the biodegradability of the wastewater improved significantly after the wet oxidation process. Activated carbon acts as a catalyst in this process which can increased the efficiency significantly. Wet hydrogen peroxide oxidation (WHPO) displayed an effective pre-treatment for the high-concentration organic wastewater.
{"title":"Wet oxidation of an industrial high concentration pharmaceutical wastewater using hydrogen peroxide as an oxidant","authors":"Xu Zeng, Jun Liu, Jianfu Zhao","doi":"10.1515/jaots-2016-0179","DOIUrl":"https://doi.org/10.1515/jaots-2016-0179","url":null,"abstract":"Abstract Wet oxidation of an industrial pharmaceutical wastewater with high concentration organic pollutants using hydrogen peroxide as an oxidant was investigated. Experiments were performed in a batch reactor to discuss the effects of reaction temperature, time, the hydrogen peroxide amount and catalyst with COD removal rate as an evaluation index. Results show that the highest COD removal rate, 81.6 %, was achieved at 240 ºC for 60 min with the addition of H2O2 solution 2 mL. The increased B/C value illustrated that the biodegradability of the wastewater improved significantly after the wet oxidation process. Activated carbon acts as a catalyst in this process which can increased the efficiency significantly. Wet hydrogen peroxide oxidation (WHPO) displayed an effective pre-treatment for the high-concentration organic wastewater.","PeriodicalId":14870,"journal":{"name":"Journal of Advanced Oxidation Technologies","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90962360","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}
Abstract Spent biological activated carbon (SAC) in a drinking water treatment plant has been regenerated with microwaves, and the regeneration effects were evaluated through iodine values, surface chemistry, surface structure energy and surface morphology by comparison with unused activated carbon (UAC). On this basis, the performance of regenerated activated carbon (RAC) was investigated by methylene blue adsorption and raw water clarification. The results showed that the iodine value of RAC recovered to 98.1 % of that of UAC, and that the BET surface area of RAC (778 m2/g) was larger than that of SAC (749 m2/g). The pore structure of RAC was more regular than that of UAC, and the removal efficiency of RAC could achieve 90.7 % due to the formation of new micropores. Organic adsorption parameters of RAC fitted the Freundich isotherm better than those of UAC, and the R2 values for CODMn (chemical oxygen demand determined by KMnO4), DOC (dissolved organic carbon) and UV254 (absorbance value of the wastewater containing organic matter at ultraviolet light of 254 nm) were 0.902, 0.921 and 0.940, respectively.
{"title":"Microwave regeneration of biological activated carbon","authors":"Daoji Wu, Shujie Li, Ning Wang","doi":"10.1515/jaots-2016-0174","DOIUrl":"https://doi.org/10.1515/jaots-2016-0174","url":null,"abstract":"Abstract Spent biological activated carbon (SAC) in a drinking water treatment plant has been regenerated with microwaves, and the regeneration effects were evaluated through iodine values, surface chemistry, surface structure energy and surface morphology by comparison with unused activated carbon (UAC). On this basis, the performance of regenerated activated carbon (RAC) was investigated by methylene blue adsorption and raw water clarification. The results showed that the iodine value of RAC recovered to 98.1 % of that of UAC, and that the BET surface area of RAC (778 m2/g) was larger than that of SAC (749 m2/g). The pore structure of RAC was more regular than that of UAC, and the removal efficiency of RAC could achieve 90.7 % due to the formation of new micropores. Organic adsorption parameters of RAC fitted the Freundich isotherm better than those of UAC, and the R2 values for CODMn (chemical oxygen demand determined by KMnO4), DOC (dissolved organic carbon) and UV254 (absorbance value of the wastewater containing organic matter at ultraviolet light of 254 nm) were 0.902, 0.921 and 0.940, respectively.","PeriodicalId":14870,"journal":{"name":"Journal of Advanced Oxidation Technologies","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89894181","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}
Li Jia-tong, Lin Yong-sheng, Shan Qing, He Da-qian, Zhao Dan, Jia Wen-bao
Abstract A laboratory investigation of the radiation-induced degradation of aniline by gamma irradiation is the subject of this paper. During the inquiry, several aqueous samples with aniline concentrations of 25, 50, 75, 100 and 200 mg/L were irradiated for 5, 10, 15, 20, 25 and 30 h, respectively, by a 60Co source with an absorbed dose rate of 0.78 kGy/h at the core channel. After the testing, the project authors scrutinized the aqueous samples to determine the effects of their irradiation by analyzing the pH, the hydroxyl radical and the H2O2 of the individual initial concentrations. The findings showed that gamma irradiation is effective in removing aniline from aqueous solutions and, in the process, tends to remove the chemical oxygen demand (COD). Among other findings, the tests revealed that at a 25 mg/L aniline concentration, up to 100 % removal is possible after only 5 h of exposure. The authors explained that kinetic studies have shown that the degradation of aniline follows a pseudo first-order reaction. They have also shown that pH plays a significant role in aniline-removal efficiency. The tests in this study revealed that with a dose of 7.8 kGy, the removal efficiency of COD in an alkaline environment is higher than that of an acidic environment. With the absorbed dose increases, the authors learned that an acidic environment is helpful for the removal efficiency of COD. They also found that by adding 50 g/L of sodium bicarbonate as the hydroxyl radical scavenger, there was an 8 % decrease in the removal efficiency of COD at the absorbed dose of 23.4 kGy. This indicates the importance of using a hydroxyl radical in the gamma irradiation process. Also, a 1 g/L H2O2 addition increases the COD removal rate from 31 % to 55 %. This percentage-point jump shows a synergistic effect in the use of gamma irradiation. The authors also identified several major decomposition products by GC/MS which are useful in the radiation-induced degradation of aniline by gamma irradiation process. Finally, they present proposals of possible pathways for successful aniline decomposition.
{"title":"The treatment of aniline in aqueous solutions by gamma irradiation","authors":"Li Jia-tong, Lin Yong-sheng, Shan Qing, He Da-qian, Zhao Dan, Jia Wen-bao","doi":"10.1515/jaots-2016-0173","DOIUrl":"https://doi.org/10.1515/jaots-2016-0173","url":null,"abstract":"Abstract A laboratory investigation of the radiation-induced degradation of aniline by gamma irradiation is the subject of this paper. During the inquiry, several aqueous samples with aniline concentrations of 25, 50, 75, 100 and 200 mg/L were irradiated for 5, 10, 15, 20, 25 and 30 h, respectively, by a 60Co source with an absorbed dose rate of 0.78 kGy/h at the core channel. After the testing, the project authors scrutinized the aqueous samples to determine the effects of their irradiation by analyzing the pH, the hydroxyl radical and the H2O2 of the individual initial concentrations. The findings showed that gamma irradiation is effective in removing aniline from aqueous solutions and, in the process, tends to remove the chemical oxygen demand (COD). Among other findings, the tests revealed that at a 25 mg/L aniline concentration, up to 100 % removal is possible after only 5 h of exposure. The authors explained that kinetic studies have shown that the degradation of aniline follows a pseudo first-order reaction. They have also shown that pH plays a significant role in aniline-removal efficiency. The tests in this study revealed that with a dose of 7.8 kGy, the removal efficiency of COD in an alkaline environment is higher than that of an acidic environment. With the absorbed dose increases, the authors learned that an acidic environment is helpful for the removal efficiency of COD. They also found that by adding 50 g/L of sodium bicarbonate as the hydroxyl radical scavenger, there was an 8 % decrease in the removal efficiency of COD at the absorbed dose of 23.4 kGy. This indicates the importance of using a hydroxyl radical in the gamma irradiation process. Also, a 1 g/L H2O2 addition increases the COD removal rate from 31 % to 55 %. This percentage-point jump shows a synergistic effect in the use of gamma irradiation. The authors also identified several major decomposition products by GC/MS which are useful in the radiation-induced degradation of aniline by gamma irradiation process. Finally, they present proposals of possible pathways for successful aniline decomposition.","PeriodicalId":14870,"journal":{"name":"Journal of Advanced Oxidation Technologies","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86520912","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}
M. Cvetnić, Š. Ukić, H. Kušić, T. Bolanča, A. Božić
Abstract The conventional water treatment technologies, mostly relying on physical and biological processes, seem to be inadequate for effective removal of priority substances such as pesticides, while advanced oxidation processes showed a good performance for the same purpose. The aim of the study was to evaluate UV-C/H2O2 and UV-C/S2O82– processes for treating seven pesticides listed as priority substances (PS-Ps) within the EU Water Framework directive; alachlor, atrazine, chlorfenvinphos, cybutryne, diuron, isoproturon and simazine. The influence of pH and pollutant/oxidant ratio ([PS-P]:[OX]) on the degradation kinetics was evaluated using full factorial plan and response surface modeling. The degradation of PS-Ps by both photooxidation processes obeyed first-order kinetics. Degradation kinetics of PS-Ps is highly depended on [PS-P]: [OX], while pH has minor significance, particularly in UV-C /S2O82– process. In most cases degradation kinetics by UV-C /S2O82– was several times faster in comparison to UV-C /H2O2 process. In addition, the inhibitory influence of NOM on the degradation of PSs in the mixture was determined.
{"title":"Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach","authors":"M. Cvetnić, Š. Ukić, H. Kušić, T. Bolanča, A. Božić","doi":"10.1515/jaots-2016-0172","DOIUrl":"https://doi.org/10.1515/jaots-2016-0172","url":null,"abstract":"Abstract The conventional water treatment technologies, mostly relying on physical and biological processes, seem to be inadequate for effective removal of priority substances such as pesticides, while advanced oxidation processes showed a good performance for the same purpose. The aim of the study was to evaluate UV-C/H2O2 and UV-C/S2O82– processes for treating seven pesticides listed as priority substances (PS-Ps) within the EU Water Framework directive; alachlor, atrazine, chlorfenvinphos, cybutryne, diuron, isoproturon and simazine. The influence of pH and pollutant/oxidant ratio ([PS-P]:[OX]) on the degradation kinetics was evaluated using full factorial plan and response surface modeling. The degradation of PS-Ps by both photooxidation processes obeyed first-order kinetics. Degradation kinetics of PS-Ps is highly depended on [PS-P]: [OX], while pH has minor significance, particularly in UV-C /S2O82– process. In most cases degradation kinetics by UV-C /S2O82– was several times faster in comparison to UV-C /H2O2 process. In addition, the inhibitory influence of NOM on the degradation of PSs in the mixture was determined.","PeriodicalId":14870,"journal":{"name":"Journal of Advanced Oxidation Technologies","volume":"140 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79957430","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}
Abstract To improve the efficiency of decomposition of dye wastewater, the experiments of sonocatalytic degradation of Acid Orange 7 by TiO2-based films with doping Co, N and Er3+: Y3Al5O12 were performed in this paper. Based on analysis of the change of concentrations of the samples over time, the result showed that sonocatalytic degradation of Acid Orange 7 by TiO2-based films agreed with the pseudo-first-order kinetics. The effect of doping mass fraction of Er3+:Y3Al5O12, Co and N inTiO2-based films and reaction temperature on degradation rates were studied. The optimal doping mass fraction of Er3+: Y3Al5O12, Co and N were 1.81 %, 2.01 %, and 12.03 % respectively at 20 °C. The model of the reaction rate constants of sonocatalytic degradation of Acid Orange 7 by Co/N/Er3+: Y3Al5O12/TiO2 films were fitted. The errors between the model values and the experimental results were all less than 15 %. So the models could be used to estimate the degradation rate and concentration of Acid Orange 7 and provide theoretical basis for the design of catalytic reaction.
{"title":"Kinetics analysis of photocatalytic degradation of Acid Orange 7 by Co/N/Er3+: Y3Al5O12/TiO2 films","authors":"Wang Lan, Z. Lin, Guo Kai","doi":"10.1515/jaots-2016-0185","DOIUrl":"https://doi.org/10.1515/jaots-2016-0185","url":null,"abstract":"Abstract To improve the efficiency of decomposition of dye wastewater, the experiments of sonocatalytic degradation of Acid Orange 7 by TiO2-based films with doping Co, N and Er3+: Y3Al5O12 were performed in this paper. Based on analysis of the change of concentrations of the samples over time, the result showed that sonocatalytic degradation of Acid Orange 7 by TiO2-based films agreed with the pseudo-first-order kinetics. The effect of doping mass fraction of Er3+:Y3Al5O12, Co and N inTiO2-based films and reaction temperature on degradation rates were studied. The optimal doping mass fraction of Er3+: Y3Al5O12, Co and N were 1.81 %, 2.01 %, and 12.03 % respectively at 20 °C. The model of the reaction rate constants of sonocatalytic degradation of Acid Orange 7 by Co/N/Er3+: Y3Al5O12/TiO2 films were fitted. The errors between the model values and the experimental results were all less than 15 %. So the models could be used to estimate the degradation rate and concentration of Acid Orange 7 and provide theoretical basis for the design of catalytic reaction.","PeriodicalId":14870,"journal":{"name":"Journal of Advanced Oxidation Technologies","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81313090","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}
Azita Mohagheghian, Kobra Ayagh, K. Godini, M. Shirzad-Siboni
Abstract In this research, photocatalytic degradation of diazinon by amino-functionalized Fe3O4-WO3 nanoparticles under UV irradiation was investigated with variation of pH, nanocatalyst dose, initial diazinon concentration, different purging gases, H2O2 concentration, and type of organic compounds. Under optimal conditions: pH= 7, [Diazinon]0= 20 mg.L–1, nanocatalyst dosage= 0.25 g.L–1, H2O2= 5 mM, 99.23 % of the insecticide was removed after 120 min. A decrease was observed in the removal efficiency of diazinon in the presence of different purging gases and organic compounds. Based on the three kinetic models developed in this study, it was found that the removal of diazinon followed the first order kinetic. Also, application of the UV/amino-functionalized Fe3O4-WO3 nanoparticles both increased the performance and decreased electric power consumption. However, 86.17 % of diazinon in real water samples was removed under the optimized conditions. Furthermore, the photocatalytic activity was kept after five successive cycles.
{"title":"Using amino-functionalized Fe3O4-WO3 nanoparticles for diazinon removal from synthetic and real water samples in presence of UV irradiation","authors":"Azita Mohagheghian, Kobra Ayagh, K. Godini, M. Shirzad-Siboni","doi":"10.1515/jaots-2016-0153","DOIUrl":"https://doi.org/10.1515/jaots-2016-0153","url":null,"abstract":"Abstract In this research, photocatalytic degradation of diazinon by amino-functionalized Fe3O4-WO3 nanoparticles under UV irradiation was investigated with variation of pH, nanocatalyst dose, initial diazinon concentration, different purging gases, H2O2 concentration, and type of organic compounds. Under optimal conditions: pH= 7, [Diazinon]0= 20 mg.L–1, nanocatalyst dosage= 0.25 g.L–1, H2O2= 5 mM, 99.23 % of the insecticide was removed after 120 min. A decrease was observed in the removal efficiency of diazinon in the presence of different purging gases and organic compounds. Based on the three kinetic models developed in this study, it was found that the removal of diazinon followed the first order kinetic. Also, application of the UV/amino-functionalized Fe3O4-WO3 nanoparticles both increased the performance and decreased electric power consumption. However, 86.17 % of diazinon in real water samples was removed under the optimized conditions. Furthermore, the photocatalytic activity was kept after five successive cycles.","PeriodicalId":14870,"journal":{"name":"Journal of Advanced Oxidation Technologies","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74807401","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}
M. D. de Luna, Joseph D. Retumban, Sergi Garcia-Segura, Ming-Chun Lu
Abstract Imidacloprid is one of the most widely used insecticides in agriculture. The fate of this highly recalcitrant pollutant and its by-product of incomplete degradation in water is of great concern due to the hazardous effects usually associated to pesticides. In the present manuscript, imidacloprid degradation by hydroxyl radical produced in-situ by conventional Fenton process is discussed. Furthermore, it has been studied the influence of propylene glycol, which is a usual excipient found in the commercial pesticides containing imidacloprid, on the conventional Fenton process performance. A two-stage degradation kinetics was observed: (i) a rapid initial decay on the first 5 min of treatment, followed by (ii) a slower kinetics defined by the Fenton-like reaction of Fe2+ catalyst regeneration. The influence of several variables on the abatement of imidacloprid such Fe2+ and H2O2 initial concentration or propylene glycol ratios have been evaluated. Experimental results demonstrate that complete imidacloprid abatement is attained under optimal conditions of 8.0 mM of H2O2 and 0.8 mM of Fe2+ after 120 min of treatment at acidic pH. However, increasing concentrations of propylene glycol diminishes the overall performance due to the competitive consumption of hydroxyl radicals.
摘要吡虫啉是农业上应用最广泛的杀虫剂之一。由于通常与杀虫剂有关的有害影响，这种高度顽固的污染物及其在水中不完全降解的副产品的命运引起了人们的极大关注。本文讨论了传统Fenton法原位生成羟基自由基对吡虫啉的降解。此外，还研究了丙二醇对传统Fenton工艺性能的影响，丙二醇是含吡虫啉的商业农药中常见的赋形剂。观察到两个阶段的降解动力学:(i)在处理的前5分钟快速初始衰变，然后(ii)由Fe2+催化剂再生的芬顿样反应定义的较慢动力学。考察了Fe2+和H2O2初始浓度或丙二醇比等几个变量对吡虫啉减效的影响。实验结果表明，在8.0 mM H2O2和0.8 mM Fe2+的最佳条件下，在酸性ph下处理120 min后，吡虫啉可以完全去除。然而，由于羟基自由基的竞争性消耗，丙二醇浓度的增加会降低整体性能。
{"title":"Degradation of imidacloprid insecticide in a binary mixture with propylene glycol by conventional fenton process","authors":"M. D. de Luna, Joseph D. Retumban, Sergi Garcia-Segura, Ming-Chun Lu","doi":"10.1515/jaots-2017-0012","DOIUrl":"https://doi.org/10.1515/jaots-2017-0012","url":null,"abstract":"Abstract Imidacloprid is one of the most widely used insecticides in agriculture. The fate of this highly recalcitrant pollutant and its by-product of incomplete degradation in water is of great concern due to the hazardous effects usually associated to pesticides. In the present manuscript, imidacloprid degradation by hydroxyl radical produced in-situ by conventional Fenton process is discussed. Furthermore, it has been studied the influence of propylene glycol, which is a usual excipient found in the commercial pesticides containing imidacloprid, on the conventional Fenton process performance. A two-stage degradation kinetics was observed: (i) a rapid initial decay on the first 5 min of treatment, followed by (ii) a slower kinetics defined by the Fenton-like reaction of Fe2+ catalyst regeneration. The influence of several variables on the abatement of imidacloprid such Fe2+ and H2O2 initial concentration or propylene glycol ratios have been evaluated. Experimental results demonstrate that complete imidacloprid abatement is attained under optimal conditions of 8.0 mM of H2O2 and 0.8 mM of Fe2+ after 120 min of treatment at acidic pH. However, increasing concentrations of propylene glycol diminishes the overall performance due to the competitive consumption of hydroxyl radicals.","PeriodicalId":14870,"journal":{"name":"Journal of Advanced Oxidation Technologies","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87581984","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}
Longjie Ji, Shengyong Lu, Cuicui Du, Xiaodong Li, A. Buekens, Jian-hua Yan
Abstract: The effect of various parameters on the catalytic oxidation of 1,2-dichlorobenzene (1,2-DCBz) present in simulated flue gas was investigated. A commercial V2O5-WO3/nano-TiO2 catalyst was used and characterized by X-ray diffraction (XRD), N2-physisorption and energy dispersive spectrometer (EDS). The 1,2-DCBz conversion efficiency was increased significantly with higher temperature and lower gas hourly space velocity (GHSV). Different influence levels of HCl on catalytic oxidation were found at lower and higher GHSV. The influence of HCl is irreversible due to the formation of volatile metal oxidochlorides, resulting in a decrease of the number of active sites.
{"title":"Oxidation of 1, 2-dichlorobenzene on a commercial V2O5-WO3/nano-TiO2 catalyst: Effect of HCl addition","authors":"Longjie Ji, Shengyong Lu, Cuicui Du, Xiaodong Li, A. Buekens, Jian-hua Yan","doi":"10.1515/jaots-2016-0169","DOIUrl":"https://doi.org/10.1515/jaots-2016-0169","url":null,"abstract":"Abstract: The effect of various parameters on the catalytic oxidation of 1,2-dichlorobenzene (1,2-DCBz) present in simulated flue gas was investigated. A commercial V2O5-WO3/nano-TiO2 catalyst was used and characterized by X-ray diffraction (XRD), N2-physisorption and energy dispersive spectrometer (EDS). The 1,2-DCBz conversion efficiency was increased significantly with higher temperature and lower gas hourly space velocity (GHSV). Different influence levels of HCl on catalytic oxidation were found at lower and higher GHSV. The influence of HCl is irreversible due to the formation of volatile metal oxidochlorides, resulting in a decrease of the number of active sites.","PeriodicalId":14870,"journal":{"name":"Journal of Advanced Oxidation Technologies","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83531741","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}
Abstract This study investigated the characteristics of liquid phase plasma-electrode catalysis system formed by micro-arc oxidation with titanium-aluminum (Ti-Al) alloy as the anode. Under different power supplies, the wastewater from printing and textile dyeing industries simulated with Rhodamine B (RhB) dye was decolored. We evaluated the impact of oxide film formed on the electrodes on the plasma effects. Our findings showed that repeated applications of opposite voltages could damage the insulating oxide film formed on the electrode surface, contributing to its breakdown and enhancing micro-arc oxidation. Intermittent power supply also modulated the coverage of oxide film by enhancing the cooling of electrolyte. Morphological study of oxide film revealed the presences of rutile and anatase titanium dioxide (TiO2) in the oxide film, which is conducive to various catalytic functions in the plasma environment.
{"title":"Effect of electrode oxide film in micro arc oxidation on water treatment","authors":"Zhiyu Yan, Manting Men, Bing Sun, Qiao-min Wang, Yue Han, M. Wen","doi":"10.1515/jaots-2016-0189","DOIUrl":"https://doi.org/10.1515/jaots-2016-0189","url":null,"abstract":"Abstract This study investigated the characteristics of liquid phase plasma-electrode catalysis system formed by micro-arc oxidation with titanium-aluminum (Ti-Al) alloy as the anode. Under different power supplies, the wastewater from printing and textile dyeing industries simulated with Rhodamine B (RhB) dye was decolored. We evaluated the impact of oxide film formed on the electrodes on the plasma effects. Our findings showed that repeated applications of opposite voltages could damage the insulating oxide film formed on the electrode surface, contributing to its breakdown and enhancing micro-arc oxidation. Intermittent power supply also modulated the coverage of oxide film by enhancing the cooling of electrolyte. Morphological study of oxide film revealed the presences of rutile and anatase titanium dioxide (TiO2) in the oxide film, which is conducive to various catalytic functions in the plasma environment.","PeriodicalId":14870,"journal":{"name":"Journal of Advanced Oxidation Technologies","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79775534","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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