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Youtao Song - One of the best experts on this subject based on the ideXlab platform.
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preparation of 5 0 er3 y3al5o12 pt tio2 ta2o5 nanocatalysts and application in sonocatalytic decomposition of Ametryn in aqueous solution
Ultrasonics Sonochemistry, 2017Co-Authors: Hongbo Zhang, Chunsheng Wei, Yingying Huang, Xuekai Dou, Yidi Wang, Jun Wang, Youtao SongAbstract:(5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, as a high effective sonocatalyst, was prepared using sol-gel and calcination method. Then it was characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). In order to evaluate the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, the sonocatalytic decomposition of Ametryn was studied. In addition, some influencing factors such as different Ti/Ta molar ratios on the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, catalyst added amount with ultrasonic irradiation time and used times on the sonocatalytic decomposition efficiency were examined by using ion chromatogram determination. The experimental results showed that the best sonocatalytic decomposition ratio of Ametryn were 77.50% based on the N atom calculation and 95.00% based on the S atom calculation, respectively, when the conditions of 10.00mg/L initial concentration, 1.00g/L prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder (Ti/Ta=1.00:0.25 heat-treated at 550°C for 3.0h) added amount, 150min ultrasonic irradiation (40kHz frequency and 300W output power), 100mL total volume and 25-28°C temperature were adopted. Therefore, the (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) composite nanoparticles could be considered as an effective sonocatalyst for decomposition of Ametryn in aqueous solution.
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Preparation of (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) nanocatalysts and application in sonocatalytic decomposition of Ametryn in aqueous solution
Ultrasonics sonochemistry, 2016Co-Authors: Hongbo Zhang, Chunsheng Wei, Yingying Huang, Xuekai Dou, Yidi Wang, Jun Wang, Youtao SongAbstract:(5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, as a high effective sonocatalyst, was prepared using sol-gel and calcination method. Then it was characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). In order to evaluate the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, the sonocatalytic decomposition of Ametryn was studied. In addition, some influencing factors such as different Ti/Ta molar ratios on the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, catalyst added amount with ultrasonic irradiation time and used times on the sonocatalytic decomposition efficiency were examined by using ion chromatogram determination. The experimental results showed that the best sonocatalytic decomposition ratio of Ametryn were 77.50% based on the N atom calculation and 95.00% based on the S atom calculation, respectively, when the conditions of 10.00mg/L initial concentration, 1.00g/L prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder (Ti/Ta=1.00:0.25 heat-treated at 550°C for 3.0h) added amount, 150min ultrasonic irradiation (40kHz frequency and 300W output power), 100mL total volume and 25-28°C temperature were adopted. Therefore, the (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) composite nanoparticles could be considered as an effective sonocatalyst for decomposition of Ametryn in aqueous solution.
Naiyun Gao - One of the best experts on this subject based on the ideXlab platform.
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Ametryn removal with nanofiltration membranes
Desalination and Water Treatment, 2011Co-Authors: Yijun Xie, Shengji Xia, Bingzhi Dong, Naiyun GaoAbstract:The wide use of herbicides is indispensable in the agriculture sector to control crop losses, at the same time it causes some environmental problem, i.e. pollution of water sources. A study on the application of nanofiltration membrane in the removal of one kind of herbicide, Ametryn, in aqueous solution was carried out in order to evaluate the performances of membrane separation. Ametryn was spiked to the different water matrices feed to a cross-flow nanofiltration pilot-plant. The rejection of Ametryn was improved with the presents of both inorganic and organic mater in synthetic water compared with spiked in reference distilled water. The rejection of Ametryn was higher in tap water than in distilled water, whereas, the water flux was lower. This may be due to that the NOM in tap water enhanced the size exclusion and charge repulsion of NOM-Ametryn complex; meanwhile, both the NOM and NOM-Ametryn complex fouled the membranes in tap water.
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Ametryn degradation in the ultraviolet uv irradiation hydrogen peroxide h2o2 treatment
Journal of Hazardous Materials, 2009Co-Authors: Naiyun Gao, Yang Deng, Dandan ZhaoAbstract:Abstract Ultraviolet (UV) irradiation (253.7 nm) in the presence of hydrogen peroxide (H 2 O 2 ) was used to decompose aqueous Ametryn. The concentrations of Ametryn were measured with time under various experiment conditions. The investigated factors included H 2 O 2 dosages, initial pH, initial Ametryn concentrations, and a variety of inorganic anions. Results showed that Ametryn degradation in UV/H 2 O 2 process was a pseudo-first-order reaction. Removal rates of Ametryn were greatly affected by H 2 O 2 dosage and initial concentrations of Ametryn, but appeared to be slightly influenced by initial pH. Furthermore, we investigated the effects of four anions (SO 4 2− , Cl − , HCO 3 − , and CO 3 2− ) on Ametryn degradation by UV/H 2 O 2 . The impact of SO 4 2− seemed to be insignificant; however, Cl − , HCO 3 − , and CO 3 2− considerably slowed down the degradation rate because they could strongly scavenge hydroxyl radicals (OH ) produced during the UV/H 2 O 2 process. Finally, a preliminary cost analysis revealed that UV/H 2 O 2 process was more cost-effective than the UV alone in removal of Ametryn from water.
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Ametryn degradation by aqueous chlorine: kinetics and reaction influences.
Journal of Hazardous Materials, 2009Co-Authors: Naiyun Gao, Hefa Cheng, Shengji Xia, Xiao-feng Sun, Xue-jiao Wang, Shaogui YangAbstract:Abstract The chemical oxidation of the herbicide Ametryn was investigated by aqueous chlorination between pH 4 and 10 at a temperature of 25 °C. Ametryn was found to react very rapidly with aqueous chlorine. The reaction kinetics can be well described by a second-order kinetic model. The apparent second-order rate constants are greater than 5 × 10 2 M −1 s −1 under acidic and neutral conditions. The reaction proceeds much more slowly under alkaline conditions. The predominant reactions were found to be the reactions of HOCl with neutral Ametryn and the charged Ametryn, with rate constants equal to 7.22 × 10 2 and 1.58 × 10 3 M −1 s −1 , respectively. The Ametryn degradation rate increases with addition of bromide and decreases with addition of ammonia during the chlorination process. Based on elementary chemical reactions, a kinetic model of Ametryn degradation by chlorination in the presence of bromide or ammonia ion was also developed. By employing this model, we estimate that the rate constants for the reactions of HOBr with neutral Ametryn and charged Ametryn were 9.07 × 10 3 and 3.54 × 10 6 M −1 s −1 , respectively. These values are 10- to 10 3 -fold higher than those of HOCl, suggesting that the presence of bromine species during chlorination could significantly accelerate Ametryn degradation.
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Ametryn degradation by aqueous chlorine: kinetics and reaction influences.
Journal of hazardous materials, 2009Co-Authors: Naiyun Gao, Hefa Cheng, Shengji Xia, Xiao-feng Sun, Xue-jiao Wang, Shaogui YangAbstract:The chemical oxidation of the herbicide Ametryn was investigated by aqueous chlorination between pH 4 and 10 at a temperature of 25 degrees C. Ametryn was found to react very rapidly with aqueous chlorine. The reaction kinetics can be well described by a second-order kinetic model. The apparent second-order rate constants are greater than 5 x 10(2)M(-1)s(-1) under acidic and neutral conditions. The reaction proceeds much more slowly under alkaline conditions. The predominant reactions were found to be the reactions of HOCl with neutral Ametryn and the charged Ametryn, with rate constants equal to 7.22 x 10(2) and 1.58 x 10(3)M(-1)s(-1), respectively. The Ametryn degradation rate increases with addition of bromide and decreases with addition of ammonia during the chlorination process. Based on elementary chemical reactions, a kinetic model of Ametryn degradation by chlorination in the presence of bromide or ammonia ion was also developed. By employing this model, we estimate that the rate constants for the reactions of HOBr with neutral Ametryn and charged Ametryn were 9.07 x 10(3) and 3.54 x 10(6)M(-1)s(-1), respectively. These values are 10- to 10(3)-fold higher than those of HOCl, suggesting that the presence of bromine species during chlorination could significantly accelerate Ametryn degradation.
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Ametryn degradation in the ultraviolet (UV) irradiation/hydrogen peroxide (H2O2) treatment.
Journal of hazardous materials, 2008Co-Authors: Naiyun Gao, Yang Deng, Dandan ZhaoAbstract:Ultraviolet (UV) irradiation (253.7nm) in the presence of hydrogen peroxide (H(2)O(2)) was used to decompose aqueous Ametryn. The concentrations of Ametryn were measured with time under various experiment conditions. The investigated factors included H(2)O(2) dosages, initial pH, initial Ametryn concentrations, and a variety of inorganic anions. Results showed that Ametryn degradation in UV/H(2)O(2) process was a pseudo-first-order reaction. Removal rates of Ametryn were greatly affected by H(2)O(2) dosage and initial concentrations of Ametryn, but appeared to be slightly influenced by initial pH. Furthermore, we investigated the effects of four anions (SO(4)(2-), Cl(-), HCO(3)(-), and CO(3)(2-)) on Ametryn degradation by UV/H(2)O(2). The impact of SO(4)(2-) seemed to be insignificant; however, Cl(-), HCO(3)(-), and CO(3)(2-) considerably slowed down the degradation rate because they could strongly scavenge hydroxyl radicals (OH) produced during the UV/H(2)O(2) process. Finally, a preliminary cost analysis revealed that UV/H(2)O(2) process was more cost-effective than the UV alone in removal of Ametryn from water.
Dandan Zhao - One of the best experts on this subject based on the ideXlab platform.
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Ametryn degradation in the ultraviolet uv irradiation hydrogen peroxide h2o2 treatment
Journal of Hazardous Materials, 2009Co-Authors: Naiyun Gao, Yang Deng, Dandan ZhaoAbstract:Abstract Ultraviolet (UV) irradiation (253.7 nm) in the presence of hydrogen peroxide (H 2 O 2 ) was used to decompose aqueous Ametryn. The concentrations of Ametryn were measured with time under various experiment conditions. The investigated factors included H 2 O 2 dosages, initial pH, initial Ametryn concentrations, and a variety of inorganic anions. Results showed that Ametryn degradation in UV/H 2 O 2 process was a pseudo-first-order reaction. Removal rates of Ametryn were greatly affected by H 2 O 2 dosage and initial concentrations of Ametryn, but appeared to be slightly influenced by initial pH. Furthermore, we investigated the effects of four anions (SO 4 2− , Cl − , HCO 3 − , and CO 3 2− ) on Ametryn degradation by UV/H 2 O 2 . The impact of SO 4 2− seemed to be insignificant; however, Cl − , HCO 3 − , and CO 3 2− considerably slowed down the degradation rate because they could strongly scavenge hydroxyl radicals (OH ) produced during the UV/H 2 O 2 process. Finally, a preliminary cost analysis revealed that UV/H 2 O 2 process was more cost-effective than the UV alone in removal of Ametryn from water.
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Ametryn degradation in the ultraviolet (UV) irradiation/hydrogen peroxide (H2O2) treatment.
Journal of hazardous materials, 2008Co-Authors: Naiyun Gao, Yang Deng, Dandan ZhaoAbstract:Ultraviolet (UV) irradiation (253.7nm) in the presence of hydrogen peroxide (H(2)O(2)) was used to decompose aqueous Ametryn. The concentrations of Ametryn were measured with time under various experiment conditions. The investigated factors included H(2)O(2) dosages, initial pH, initial Ametryn concentrations, and a variety of inorganic anions. Results showed that Ametryn degradation in UV/H(2)O(2) process was a pseudo-first-order reaction. Removal rates of Ametryn were greatly affected by H(2)O(2) dosage and initial concentrations of Ametryn, but appeared to be slightly influenced by initial pH. Furthermore, we investigated the effects of four anions (SO(4)(2-), Cl(-), HCO(3)(-), and CO(3)(2-)) on Ametryn degradation by UV/H(2)O(2). The impact of SO(4)(2-) seemed to be insignificant; however, Cl(-), HCO(3)(-), and CO(3)(2-) considerably slowed down the degradation rate because they could strongly scavenge hydroxyl radicals (OH) produced during the UV/H(2)O(2) process. Finally, a preliminary cost analysis revealed that UV/H(2)O(2) process was more cost-effective than the UV alone in removal of Ametryn from water.
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Degradation of Herbicide (Ametryn) in Water By UV-H2O2 Combinated Process
2008 2nd International Conference on Bioinformatics and Biomedical Engineering, 2008Co-Authors: Naiyun Gao, Wenhai Chu, Dandan Zhao, Jianfu ZhaoAbstract:The removal performances of Ametryn in drinking water using UV-H2O2 combinated process was investigated in this paper. The results showed that Ametryn cannot be effectively removed by UV radiation and H2O2 oxidation alone, while UV-H2O2 combination process could achieve quite good removal efficiency. As the initial concentration of Ametryn about 0.901 mg/L, its removal efficiency reached 97.68% under the condition that the intensity of UV radiation, the dosage of H2O2, reaction time, pH and residual concentration were 85.7 muW/cm2, 5 mg/L, 40 minutes, 7.0 and 0.021 mg/L, respectively. The kinetic effects of H2O2 dosage, pH values and Ametryn initial concentration on the conversion of Ametryn were examined respectively. Analysis of factors showed that UV radiation intensity, H2O2 dosage, pH values and Ametryn initial concentrations have important effect on the degradation of Ametryn.
Hongbo Zhang - One of the best experts on this subject based on the ideXlab platform.
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preparation of 5 0 er3 y3al5o12 pt tio2 ta2o5 nanocatalysts and application in sonocatalytic decomposition of Ametryn in aqueous solution
Ultrasonics Sonochemistry, 2017Co-Authors: Hongbo Zhang, Chunsheng Wei, Yingying Huang, Xuekai Dou, Yidi Wang, Jun Wang, Youtao SongAbstract:(5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, as a high effective sonocatalyst, was prepared using sol-gel and calcination method. Then it was characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). In order to evaluate the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, the sonocatalytic decomposition of Ametryn was studied. In addition, some influencing factors such as different Ti/Ta molar ratios on the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, catalyst added amount with ultrasonic irradiation time and used times on the sonocatalytic decomposition efficiency were examined by using ion chromatogram determination. The experimental results showed that the best sonocatalytic decomposition ratio of Ametryn were 77.50% based on the N atom calculation and 95.00% based on the S atom calculation, respectively, when the conditions of 10.00mg/L initial concentration, 1.00g/L prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder (Ti/Ta=1.00:0.25 heat-treated at 550°C for 3.0h) added amount, 150min ultrasonic irradiation (40kHz frequency and 300W output power), 100mL total volume and 25-28°C temperature were adopted. Therefore, the (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) composite nanoparticles could be considered as an effective sonocatalyst for decomposition of Ametryn in aqueous solution.
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Preparation of (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) nanocatalysts and application in sonocatalytic decomposition of Ametryn in aqueous solution
Ultrasonics sonochemistry, 2016Co-Authors: Hongbo Zhang, Chunsheng Wei, Yingying Huang, Xuekai Dou, Yidi Wang, Jun Wang, Youtao SongAbstract:(5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, as a high effective sonocatalyst, was prepared using sol-gel and calcination method. Then it was characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). In order to evaluate the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, the sonocatalytic decomposition of Ametryn was studied. In addition, some influencing factors such as different Ti/Ta molar ratios on the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, catalyst added amount with ultrasonic irradiation time and used times on the sonocatalytic decomposition efficiency were examined by using ion chromatogram determination. The experimental results showed that the best sonocatalytic decomposition ratio of Ametryn were 77.50% based on the N atom calculation and 95.00% based on the S atom calculation, respectively, when the conditions of 10.00mg/L initial concentration, 1.00g/L prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder (Ti/Ta=1.00:0.25 heat-treated at 550°C for 3.0h) added amount, 150min ultrasonic irradiation (40kHz frequency and 300W output power), 100mL total volume and 25-28°C temperature were adopted. Therefore, the (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) composite nanoparticles could be considered as an effective sonocatalyst for decomposition of Ametryn in aqueous solution.
Yingying Huang - One of the best experts on this subject based on the ideXlab platform.
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preparation of 5 0 er3 y3al5o12 pt tio2 ta2o5 nanocatalysts and application in sonocatalytic decomposition of Ametryn in aqueous solution
Ultrasonics Sonochemistry, 2017Co-Authors: Hongbo Zhang, Chunsheng Wei, Yingying Huang, Xuekai Dou, Yidi Wang, Jun Wang, Youtao SongAbstract:(5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, as a high effective sonocatalyst, was prepared using sol-gel and calcination method. Then it was characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). In order to evaluate the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, the sonocatalytic decomposition of Ametryn was studied. In addition, some influencing factors such as different Ti/Ta molar ratios on the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, catalyst added amount with ultrasonic irradiation time and used times on the sonocatalytic decomposition efficiency were examined by using ion chromatogram determination. The experimental results showed that the best sonocatalytic decomposition ratio of Ametryn were 77.50% based on the N atom calculation and 95.00% based on the S atom calculation, respectively, when the conditions of 10.00mg/L initial concentration, 1.00g/L prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder (Ti/Ta=1.00:0.25 heat-treated at 550°C for 3.0h) added amount, 150min ultrasonic irradiation (40kHz frequency and 300W output power), 100mL total volume and 25-28°C temperature were adopted. Therefore, the (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) composite nanoparticles could be considered as an effective sonocatalyst for decomposition of Ametryn in aqueous solution.
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Preparation of (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) nanocatalysts and application in sonocatalytic decomposition of Ametryn in aqueous solution
Ultrasonics sonochemistry, 2016Co-Authors: Hongbo Zhang, Chunsheng Wei, Yingying Huang, Xuekai Dou, Yidi Wang, Jun Wang, Youtao SongAbstract:(5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, as a high effective sonocatalyst, was prepared using sol-gel and calcination method. Then it was characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). In order to evaluate the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, the sonocatalytic decomposition of Ametryn was studied. In addition, some influencing factors such as different Ti/Ta molar ratios on the sonocatalytic activity of the prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder, catalyst added amount with ultrasonic irradiation time and used times on the sonocatalytic decomposition efficiency were examined by using ion chromatogram determination. The experimental results showed that the best sonocatalytic decomposition ratio of Ametryn were 77.50% based on the N atom calculation and 95.00% based on the S atom calculation, respectively, when the conditions of 10.00mg/L initial concentration, 1.00g/L prepared (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) powder (Ti/Ta=1.00:0.25 heat-treated at 550°C for 3.0h) added amount, 150min ultrasonic irradiation (40kHz frequency and 300W output power), 100mL total volume and 25-28°C temperature were adopted. Therefore, the (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) composite nanoparticles could be considered as an effective sonocatalyst for decomposition of Ametryn in aqueous solution.