The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform
Xiaohong Guan - One of the best experts on this subject based on the ideXlab platform.
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influence of Sulfite fe vi molar ratio on the active oxidants generation in fe vi Sulfite Process
Journal of Hazardous Materials, 2020Co-Authors: Binbin Shao, Hongyu Dong, Liying Feng, Junlian Qiao, Xiaohong GuanAbstract:Although several groups have made efforts to study micropollutants degradation by Fe(VI)/Sulfite Process, the mechanism is far from clear and warrants further investigation. Herein, the degradation kinetics and mechanism of selected micropollutants by Sulfite (SO32-)-activated Fe(VI) oxidation were systematically investigated. The oxidation rates of enrofloxacin (ENR) and phenol in Fe(VI)/Sulfite Process ranged from 0.151 s-1 to 6.18 s-1 at pH 6.5 and 8.0. Sulfite applied in multiple-addition mode improved the degradation efficiency of micropollutants with electron-rich moieties compared to the single-addition mode. Based on results of the quenching experiments and kinetic simulation, Fe(V) was identified as the predominant active oxidant at [SO32-]/[Fe(VI)] molar ratio of 0.1 to 0.3. However, both Fe(V) and SO4-/OH contributed to micropollutants oxidation at [SO32-]/[Fe(VI)] molar ratio ≥ 0.4 and their contributions were strongly dependent on the properties of micropollutants. The different degradation products of ENR in Fe(VI)/Sulfite Process at different Sulfite dosages further supported the contribution of different active oxidants at different [SO32-]/[Fe(VI)] molar ratios. The toxicity of the reaction products of ENR towards Vibrio qinghaiensis sp.-Q67 decreased dramatically after Fe(VI)/Sulfite treatment. The results of this work may promote the application of Sulfite-activated Fe(VI) oxidation in water treatment.
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Insights into the Oxidation of Organic Cocontaminants during Cr(VI) Reduction by Sulfite: The Overlooked Significance of Cr(V).
Environmental science & technology, 2020Co-Authors: Hongyu Dong, Binbin Shao, Xiaohong Guan, Guangfeng Wei, Tong-cheng Cao, Timothy J. StrathmannAbstract:Literature works reported that organic cocontaminants could be degraded during Cr(VI), a contaminant, reduction by Sulfite (Cr(VI)/Sulfite Process). However, the role of Cr(V) and Cr(IV) intermedia...
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Efficient recovery of Sb(V) by hydrated electron reduction followed by cathodic deposition in a photoelectrochemical Process
Chemical Engineering Journal, 2020Co-Authors: Xu Zhao, Di Cao, Xiaohong GuanAbstract:Abstract Recovery of antimony (Sb) from wastewater is desired. Deposition of Sb(III) to metal Sb can occur via cathodic reduction, which is limited for Sb(V) reduction. Herein, a UV/Sulfite-assisted electrodeposition (UV/Sulfite/E) system was developed for the recovery of Sb(V) as metal Sb. The hydrated electron (eaq−) generated from UV/Sulfite Process reduced Sb(V) to Sb(III), which was simultaneously reduced to metal Sb via cathodic reduction. Results indicated that as high as 95% of Sb(V) with a concentration of 50 mg/L can be deposited onto the cathode as metal Sb within 6 h. The reduction of Sb(V) to Sb(III) by eaq− was confirmed by laser flash photolysis tests. More importantly, the OH− generated at cathode increased the pH of the UV/Sulfite/E system and enabled the eaq− generation even at pH = 4, which was beneficial for Sb(V) reduction at a wide pH range. The optimal conditions for Sb(V) recovery were found to be at a Sulfite concentration of 10 mM and an applied potential of −1.2 V (vs. SCE). The recovery of Sb(V) from practical Sb-containing wastewater was finally carried out and the results indicated that more than 60% of Sb was recovered as metal Sb.
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Mechanistic insight into the generation of reactive oxygen species in Sulfite activation with Fe(III) for contaminants degradation.
Journal of hazardous materials, 2019Co-Authors: Hongyu Dong, Guangfeng Wei, Daqiang Yin, Xiaohong GuanAbstract:Abstract Since the reactive species during the Sulfite activation by Fe(III) (Fe(III)/Sulfite Process) had not been directly determined and the role of in-situ generated Fe(II) was overlooked, this study evaluated the oxidation performance of the Fe(III)/Sulfite Process, identified the reactive species, and investigated the role of in-situ generated Fe(II) in this Process. The results demonstrated that carbamazepine (CBZ) could be degraded at different Sulfite concentrations. Compared to the single-dosing mode, Sulfite applied with multiple-dosing mode was beneficial to CBZ removal in this Process when the same amount of Sulfite was dosed. Fe(II) was rapidly generated and then decayed in this Process, which were consistent with the trends of CBZ degradation and Sulfite consumption. Electron paramagnetic resonance and scavenging experiments showed that SO4 − was a major oxidant, while HO also played a significant role in CBZ degradation in this Process. The tert-butyl alcohol assay indicated that the generation and re-oxidation of Fe(II) was accompanied with the generation of reactive species. Besides Sulfite dosage, CBZ degradation was also affected by initial pH, Fe(III) dosage, and CBZ concentration. Cl− showed little inhibition on CBZ degradation while humic acid inhibited CBZ degradation in this Process. This study advances the application of this oxidation system.
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Influence of [Sulfite]/[Fe(VI)] molar ratio on the active oxidants generation in Fe(VI)/Sulfite Process.
Journal of hazardous materials, 2019Co-Authors: Binbin Shao, Hongyu Dong, Liying Feng, Junlian Qiao, Xiaohong GuanAbstract:Although several groups have made efforts to study micropollutants degradation by Fe(VI)/Sulfite Process, the mechanism is far from clear and warrants further investigation. Herein, the degradation kinetics and mechanism of selected micropollutants by Sulfite (SO32-)-activated Fe(VI) oxidation were systematically investigated. The oxidation rates of enrofloxacin (ENR) and phenol in Fe(VI)/Sulfite Process ranged from 0.151 s-1 to 6.18 s-1 at pH 6.5 and 8.0. Sulfite applied in multiple-addition mode improved the degradation efficiency of micropollutants with electron-rich moieties compared to the single-addition mode. Based on results of the quenching experiments and kinetic simulation, Fe(V) was identified as the predominant active oxidant at [SO32-]/[Fe(VI)] molar ratio of 0.1 to 0.3. However, both Fe(V) and SO4-/OH contributed to micropollutants oxidation at [SO32-]/[Fe(VI)] molar ratio ≥ 0.4 and their contributions were strongly dependent on the properties of micropollutants. The different degradation products of ENR in Fe(VI)/Sulfite Process at different Sulfite dosages further supported the contribution of different active oxidants at different [SO32-]/[Fe(VI)] molar ratios. The toxicity of the reaction products of ENR towards Vibrio qinghaiensis sp.-Q67 decreased dramatically after Fe(VI)/Sulfite treatment. The results of this work may promote the application of Sulfite-activated Fe(VI) oxidation in water treatment.
Binbin Shao - One of the best experts on this subject based on the ideXlab platform.
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influence of Sulfite fe vi molar ratio on the active oxidants generation in fe vi Sulfite Process
Journal of Hazardous Materials, 2020Co-Authors: Binbin Shao, Hongyu Dong, Liying Feng, Junlian Qiao, Xiaohong GuanAbstract:Although several groups have made efforts to study micropollutants degradation by Fe(VI)/Sulfite Process, the mechanism is far from clear and warrants further investigation. Herein, the degradation kinetics and mechanism of selected micropollutants by Sulfite (SO32-)-activated Fe(VI) oxidation were systematically investigated. The oxidation rates of enrofloxacin (ENR) and phenol in Fe(VI)/Sulfite Process ranged from 0.151 s-1 to 6.18 s-1 at pH 6.5 and 8.0. Sulfite applied in multiple-addition mode improved the degradation efficiency of micropollutants with electron-rich moieties compared to the single-addition mode. Based on results of the quenching experiments and kinetic simulation, Fe(V) was identified as the predominant active oxidant at [SO32-]/[Fe(VI)] molar ratio of 0.1 to 0.3. However, both Fe(V) and SO4-/OH contributed to micropollutants oxidation at [SO32-]/[Fe(VI)] molar ratio ≥ 0.4 and their contributions were strongly dependent on the properties of micropollutants. The different degradation products of ENR in Fe(VI)/Sulfite Process at different Sulfite dosages further supported the contribution of different active oxidants at different [SO32-]/[Fe(VI)] molar ratios. The toxicity of the reaction products of ENR towards Vibrio qinghaiensis sp.-Q67 decreased dramatically after Fe(VI)/Sulfite treatment. The results of this work may promote the application of Sulfite-activated Fe(VI) oxidation in water treatment.
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Insights into the Oxidation of Organic Cocontaminants during Cr(VI) Reduction by Sulfite: The Overlooked Significance of Cr(V).
Environmental science & technology, 2020Co-Authors: Hongyu Dong, Binbin Shao, Xiaohong Guan, Guangfeng Wei, Tong-cheng Cao, Timothy J. StrathmannAbstract:Literature works reported that organic cocontaminants could be degraded during Cr(VI), a contaminant, reduction by Sulfite (Cr(VI)/Sulfite Process). However, the role of Cr(V) and Cr(IV) intermedia...
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Influence of [Sulfite]/[Fe(VI)] molar ratio on the active oxidants generation in Fe(VI)/Sulfite Process.
Journal of hazardous materials, 2019Co-Authors: Binbin Shao, Hongyu Dong, Liying Feng, Junlian Qiao, Xiaohong GuanAbstract:Although several groups have made efforts to study micropollutants degradation by Fe(VI)/Sulfite Process, the mechanism is far from clear and warrants further investigation. Herein, the degradation kinetics and mechanism of selected micropollutants by Sulfite (SO32-)-activated Fe(VI) oxidation were systematically investigated. The oxidation rates of enrofloxacin (ENR) and phenol in Fe(VI)/Sulfite Process ranged from 0.151 s-1 to 6.18 s-1 at pH 6.5 and 8.0. Sulfite applied in multiple-addition mode improved the degradation efficiency of micropollutants with electron-rich moieties compared to the single-addition mode. Based on results of the quenching experiments and kinetic simulation, Fe(V) was identified as the predominant active oxidant at [SO32-]/[Fe(VI)] molar ratio of 0.1 to 0.3. However, both Fe(V) and SO4-/OH contributed to micropollutants oxidation at [SO32-]/[Fe(VI)] molar ratio ≥ 0.4 and their contributions were strongly dependent on the properties of micropollutants. The different degradation products of ENR in Fe(VI)/Sulfite Process at different Sulfite dosages further supported the contribution of different active oxidants at different [SO32-]/[Fe(VI)] molar ratios. The toxicity of the reaction products of ENR towards Vibrio qinghaiensis sp.-Q67 decreased dramatically after Fe(VI)/Sulfite treatment. The results of this work may promote the application of Sulfite-activated Fe(VI) oxidation in water treatment.
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Role of Ferrate(IV) and Ferrate(V) in Activating Ferrate(VI) by Calcium Sulfite for Enhanced Oxidation of Organic Contaminants
Environmental science & technology, 2019Co-Authors: Binbin Shao, Hongyu Dong, Bo Sun, Xiaohong GuanAbstract:Although the Fe(VI)-Sulfite Process has shown great potential for the rapid removal of organic contaminants, the major active oxidants (Fe(IV)/Fe(V) versus SO4•-/•OH) involved in this Process are still under debate. By employing sparingly soluble CaSO3 as a slow-releasing source of SO32-, this study evaluated the oxidation performance of the Fe(VI)-CaSO3 Process and identified the active oxidants involved in this Process. The Process exhibited efficient oxidation of a variety of compounds, including antibiotics, pharmaceuticals, and pesticides, at rates that were 6.1-173.7-fold faster than those measured for Fe(VI) alone, depending on pH, CaSO3 dosage, and the properties of organic contaminants. Many lines of evidence verified that neither SO4•- nor •OH was the active species in the Fe(VI)-CaSO3 Process. The accelerating effect of CaSO3 was ascribed to the direct generation of Fe(IV)/Fe(V) species from the reaction of Fe(VI) with soluble SO32- via one-electron steps as well as the indirect generation of Fe(IV)/Fe(V) species from the self-decay of Fe(VI) and Fe(VI) reaction with H2O2, which could be catalyzed by uncomplexed Fe(III). Besides, the Fe(VI)-CaSO3 Process exhibited satisfactory removal of organic contaminants in real water, and inorganic anions showed negligible effects on organic contaminant decomposition in this Process. Thus, the Fe(VI)-CaSO3 Process with Fe(IV)/Fe(V) as reactive oxidants may be a promising method for abating various micropollutants in water treatment.
Hongyu Dong - One of the best experts on this subject based on the ideXlab platform.
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influence of Sulfite fe vi molar ratio on the active oxidants generation in fe vi Sulfite Process
Journal of Hazardous Materials, 2020Co-Authors: Binbin Shao, Hongyu Dong, Liying Feng, Junlian Qiao, Xiaohong GuanAbstract:Although several groups have made efforts to study micropollutants degradation by Fe(VI)/Sulfite Process, the mechanism is far from clear and warrants further investigation. Herein, the degradation kinetics and mechanism of selected micropollutants by Sulfite (SO32-)-activated Fe(VI) oxidation were systematically investigated. The oxidation rates of enrofloxacin (ENR) and phenol in Fe(VI)/Sulfite Process ranged from 0.151 s-1 to 6.18 s-1 at pH 6.5 and 8.0. Sulfite applied in multiple-addition mode improved the degradation efficiency of micropollutants with electron-rich moieties compared to the single-addition mode. Based on results of the quenching experiments and kinetic simulation, Fe(V) was identified as the predominant active oxidant at [SO32-]/[Fe(VI)] molar ratio of 0.1 to 0.3. However, both Fe(V) and SO4-/OH contributed to micropollutants oxidation at [SO32-]/[Fe(VI)] molar ratio ≥ 0.4 and their contributions were strongly dependent on the properties of micropollutants. The different degradation products of ENR in Fe(VI)/Sulfite Process at different Sulfite dosages further supported the contribution of different active oxidants at different [SO32-]/[Fe(VI)] molar ratios. The toxicity of the reaction products of ENR towards Vibrio qinghaiensis sp.-Q67 decreased dramatically after Fe(VI)/Sulfite treatment. The results of this work may promote the application of Sulfite-activated Fe(VI) oxidation in water treatment.
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Insights into the Oxidation of Organic Cocontaminants during Cr(VI) Reduction by Sulfite: The Overlooked Significance of Cr(V).
Environmental science & technology, 2020Co-Authors: Hongyu Dong, Binbin Shao, Xiaohong Guan, Guangfeng Wei, Tong-cheng Cao, Timothy J. StrathmannAbstract:Literature works reported that organic cocontaminants could be degraded during Cr(VI), a contaminant, reduction by Sulfite (Cr(VI)/Sulfite Process). However, the role of Cr(V) and Cr(IV) intermedia...
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Mechanistic insight into the generation of reactive oxygen species in Sulfite activation with Fe(III) for contaminants degradation.
Journal of hazardous materials, 2019Co-Authors: Hongyu Dong, Guangfeng Wei, Daqiang Yin, Xiaohong GuanAbstract:Abstract Since the reactive species during the Sulfite activation by Fe(III) (Fe(III)/Sulfite Process) had not been directly determined and the role of in-situ generated Fe(II) was overlooked, this study evaluated the oxidation performance of the Fe(III)/Sulfite Process, identified the reactive species, and investigated the role of in-situ generated Fe(II) in this Process. The results demonstrated that carbamazepine (CBZ) could be degraded at different Sulfite concentrations. Compared to the single-dosing mode, Sulfite applied with multiple-dosing mode was beneficial to CBZ removal in this Process when the same amount of Sulfite was dosed. Fe(II) was rapidly generated and then decayed in this Process, which were consistent with the trends of CBZ degradation and Sulfite consumption. Electron paramagnetic resonance and scavenging experiments showed that SO4 − was a major oxidant, while HO also played a significant role in CBZ degradation in this Process. The tert-butyl alcohol assay indicated that the generation and re-oxidation of Fe(II) was accompanied with the generation of reactive species. Besides Sulfite dosage, CBZ degradation was also affected by initial pH, Fe(III) dosage, and CBZ concentration. Cl− showed little inhibition on CBZ degradation while humic acid inhibited CBZ degradation in this Process. This study advances the application of this oxidation system.
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Influence of [Sulfite]/[Fe(VI)] molar ratio on the active oxidants generation in Fe(VI)/Sulfite Process.
Journal of hazardous materials, 2019Co-Authors: Binbin Shao, Hongyu Dong, Liying Feng, Junlian Qiao, Xiaohong GuanAbstract:Although several groups have made efforts to study micropollutants degradation by Fe(VI)/Sulfite Process, the mechanism is far from clear and warrants further investigation. Herein, the degradation kinetics and mechanism of selected micropollutants by Sulfite (SO32-)-activated Fe(VI) oxidation were systematically investigated. The oxidation rates of enrofloxacin (ENR) and phenol in Fe(VI)/Sulfite Process ranged from 0.151 s-1 to 6.18 s-1 at pH 6.5 and 8.0. Sulfite applied in multiple-addition mode improved the degradation efficiency of micropollutants with electron-rich moieties compared to the single-addition mode. Based on results of the quenching experiments and kinetic simulation, Fe(V) was identified as the predominant active oxidant at [SO32-]/[Fe(VI)] molar ratio of 0.1 to 0.3. However, both Fe(V) and SO4-/OH contributed to micropollutants oxidation at [SO32-]/[Fe(VI)] molar ratio ≥ 0.4 and their contributions were strongly dependent on the properties of micropollutants. The different degradation products of ENR in Fe(VI)/Sulfite Process at different Sulfite dosages further supported the contribution of different active oxidants at different [SO32-]/[Fe(VI)] molar ratios. The toxicity of the reaction products of ENR towards Vibrio qinghaiensis sp.-Q67 decreased dramatically after Fe(VI)/Sulfite treatment. The results of this work may promote the application of Sulfite-activated Fe(VI) oxidation in water treatment.
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Role of Ferrate(IV) and Ferrate(V) in Activating Ferrate(VI) by Calcium Sulfite for Enhanced Oxidation of Organic Contaminants
Environmental science & technology, 2019Co-Authors: Binbin Shao, Hongyu Dong, Bo Sun, Xiaohong GuanAbstract:Although the Fe(VI)-Sulfite Process has shown great potential for the rapid removal of organic contaminants, the major active oxidants (Fe(IV)/Fe(V) versus SO4•-/•OH) involved in this Process are still under debate. By employing sparingly soluble CaSO3 as a slow-releasing source of SO32-, this study evaluated the oxidation performance of the Fe(VI)-CaSO3 Process and identified the active oxidants involved in this Process. The Process exhibited efficient oxidation of a variety of compounds, including antibiotics, pharmaceuticals, and pesticides, at rates that were 6.1-173.7-fold faster than those measured for Fe(VI) alone, depending on pH, CaSO3 dosage, and the properties of organic contaminants. Many lines of evidence verified that neither SO4•- nor •OH was the active species in the Fe(VI)-CaSO3 Process. The accelerating effect of CaSO3 was ascribed to the direct generation of Fe(IV)/Fe(V) species from the reaction of Fe(VI) with soluble SO32- via one-electron steps as well as the indirect generation of Fe(IV)/Fe(V) species from the self-decay of Fe(VI) and Fe(VI) reaction with H2O2, which could be catalyzed by uncomplexed Fe(III). Besides, the Fe(VI)-CaSO3 Process exhibited satisfactory removal of organic contaminants in real water, and inorganic anions showed negligible effects on organic contaminant decomposition in this Process. Thus, the Fe(VI)-CaSO3 Process with Fe(IV)/Fe(V) as reactive oxidants may be a promising method for abating various micropollutants in water treatment.
Junlian Qiao - One of the best experts on this subject based on the ideXlab platform.
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influence of Sulfite fe vi molar ratio on the active oxidants generation in fe vi Sulfite Process
Journal of Hazardous Materials, 2020Co-Authors: Binbin Shao, Hongyu Dong, Liying Feng, Junlian Qiao, Xiaohong GuanAbstract:Although several groups have made efforts to study micropollutants degradation by Fe(VI)/Sulfite Process, the mechanism is far from clear and warrants further investigation. Herein, the degradation kinetics and mechanism of selected micropollutants by Sulfite (SO32-)-activated Fe(VI) oxidation were systematically investigated. The oxidation rates of enrofloxacin (ENR) and phenol in Fe(VI)/Sulfite Process ranged from 0.151 s-1 to 6.18 s-1 at pH 6.5 and 8.0. Sulfite applied in multiple-addition mode improved the degradation efficiency of micropollutants with electron-rich moieties compared to the single-addition mode. Based on results of the quenching experiments and kinetic simulation, Fe(V) was identified as the predominant active oxidant at [SO32-]/[Fe(VI)] molar ratio of 0.1 to 0.3. However, both Fe(V) and SO4-/OH contributed to micropollutants oxidation at [SO32-]/[Fe(VI)] molar ratio ≥ 0.4 and their contributions were strongly dependent on the properties of micropollutants. The different degradation products of ENR in Fe(VI)/Sulfite Process at different Sulfite dosages further supported the contribution of different active oxidants at different [SO32-]/[Fe(VI)] molar ratios. The toxicity of the reaction products of ENR towards Vibrio qinghaiensis sp.-Q67 decreased dramatically after Fe(VI)/Sulfite treatment. The results of this work may promote the application of Sulfite-activated Fe(VI) oxidation in water treatment.
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Influence of [Sulfite]/[Fe(VI)] molar ratio on the active oxidants generation in Fe(VI)/Sulfite Process.
Journal of hazardous materials, 2019Co-Authors: Binbin Shao, Hongyu Dong, Liying Feng, Junlian Qiao, Xiaohong GuanAbstract:Although several groups have made efforts to study micropollutants degradation by Fe(VI)/Sulfite Process, the mechanism is far from clear and warrants further investigation. Herein, the degradation kinetics and mechanism of selected micropollutants by Sulfite (SO32-)-activated Fe(VI) oxidation were systematically investigated. The oxidation rates of enrofloxacin (ENR) and phenol in Fe(VI)/Sulfite Process ranged from 0.151 s-1 to 6.18 s-1 at pH 6.5 and 8.0. Sulfite applied in multiple-addition mode improved the degradation efficiency of micropollutants with electron-rich moieties compared to the single-addition mode. Based on results of the quenching experiments and kinetic simulation, Fe(V) was identified as the predominant active oxidant at [SO32-]/[Fe(VI)] molar ratio of 0.1 to 0.3. However, both Fe(V) and SO4-/OH contributed to micropollutants oxidation at [SO32-]/[Fe(VI)] molar ratio ≥ 0.4 and their contributions were strongly dependent on the properties of micropollutants. The different degradation products of ENR in Fe(VI)/Sulfite Process at different Sulfite dosages further supported the contribution of different active oxidants at different [SO32-]/[Fe(VI)] molar ratios. The toxicity of the reaction products of ENR towards Vibrio qinghaiensis sp.-Q67 decreased dramatically after Fe(VI)/Sulfite treatment. The results of this work may promote the application of Sulfite-activated Fe(VI) oxidation in water treatment.
Liying Feng - One of the best experts on this subject based on the ideXlab platform.
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influence of Sulfite fe vi molar ratio on the active oxidants generation in fe vi Sulfite Process
Journal of Hazardous Materials, 2020Co-Authors: Binbin Shao, Hongyu Dong, Liying Feng, Junlian Qiao, Xiaohong GuanAbstract:Although several groups have made efforts to study micropollutants degradation by Fe(VI)/Sulfite Process, the mechanism is far from clear and warrants further investigation. Herein, the degradation kinetics and mechanism of selected micropollutants by Sulfite (SO32-)-activated Fe(VI) oxidation were systematically investigated. The oxidation rates of enrofloxacin (ENR) and phenol in Fe(VI)/Sulfite Process ranged from 0.151 s-1 to 6.18 s-1 at pH 6.5 and 8.0. Sulfite applied in multiple-addition mode improved the degradation efficiency of micropollutants with electron-rich moieties compared to the single-addition mode. Based on results of the quenching experiments and kinetic simulation, Fe(V) was identified as the predominant active oxidant at [SO32-]/[Fe(VI)] molar ratio of 0.1 to 0.3. However, both Fe(V) and SO4-/OH contributed to micropollutants oxidation at [SO32-]/[Fe(VI)] molar ratio ≥ 0.4 and their contributions were strongly dependent on the properties of micropollutants. The different degradation products of ENR in Fe(VI)/Sulfite Process at different Sulfite dosages further supported the contribution of different active oxidants at different [SO32-]/[Fe(VI)] molar ratios. The toxicity of the reaction products of ENR towards Vibrio qinghaiensis sp.-Q67 decreased dramatically after Fe(VI)/Sulfite treatment. The results of this work may promote the application of Sulfite-activated Fe(VI) oxidation in water treatment.
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Influence of [Sulfite]/[Fe(VI)] molar ratio on the active oxidants generation in Fe(VI)/Sulfite Process.
Journal of hazardous materials, 2019Co-Authors: Binbin Shao, Hongyu Dong, Liying Feng, Junlian Qiao, Xiaohong GuanAbstract:Although several groups have made efforts to study micropollutants degradation by Fe(VI)/Sulfite Process, the mechanism is far from clear and warrants further investigation. Herein, the degradation kinetics and mechanism of selected micropollutants by Sulfite (SO32-)-activated Fe(VI) oxidation were systematically investigated. The oxidation rates of enrofloxacin (ENR) and phenol in Fe(VI)/Sulfite Process ranged from 0.151 s-1 to 6.18 s-1 at pH 6.5 and 8.0. Sulfite applied in multiple-addition mode improved the degradation efficiency of micropollutants with electron-rich moieties compared to the single-addition mode. Based on results of the quenching experiments and kinetic simulation, Fe(V) was identified as the predominant active oxidant at [SO32-]/[Fe(VI)] molar ratio of 0.1 to 0.3. However, both Fe(V) and SO4-/OH contributed to micropollutants oxidation at [SO32-]/[Fe(VI)] molar ratio ≥ 0.4 and their contributions were strongly dependent on the properties of micropollutants. The different degradation products of ENR in Fe(VI)/Sulfite Process at different Sulfite dosages further supported the contribution of different active oxidants at different [SO32-]/[Fe(VI)] molar ratios. The toxicity of the reaction products of ENR towards Vibrio qinghaiensis sp.-Q67 decreased dramatically after Fe(VI)/Sulfite treatment. The results of this work may promote the application of Sulfite-activated Fe(VI) oxidation in water treatment.
