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Electrochemical enhanced heterogeneous activation of peroxydisulfate by Fe-Co/SBA-15 catalyst for the degradation of Orange II in water.
Water Res. 2014 Dec 01; 66:473-485.WR

Abstract

Mesoporous silica SBA-15 supported iron and cobalt catalysts (Fe-Co/SBA-15) were prepared and used in the electrochemical (EC) enhanced heterogeneous activation of peroxydisulfate (PDS, S2O8(2-)) process for the removal of Orange II. The effects of some important reaction parameters such as initial pH, current density, PDS concentration and dosage of Fe-Co/SBA-15 catalysts were investigated. The results showed that the decolorization efficiency was not significantly affected by the initial pH value, and it did increase with the higher PDS concentration, current density and Fe-Co/SBA-15 dosage. Both the sulfate radical (SO4(·-)) and the hydroxyl radical (OH) are considered as the primary reactive oxidants for the Orange II decolorization. The Fe-Co/SBA-15 catalyst maintained its high activity during repeated batch experiments. The intermediate products were identified by GC-MS analysis and a plausible degradation pathway is proposed accordingly. The removal efficiencies of chemical oxygen demand (COD) and total organic carbon (TOC) were 52.1% and 31.9%, respectively after 60 min of reaction time but reached 82.9% and 51.5%, respectively when the reaction time was extended to 24 h. Toxicity tests with activated sludge indicated that the toxicity of the solution increased during the first 30 min and then decreased as the oxidation proceeded.

Authors+Show Affiliations

Department of Environmental Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China.Department of Environmental Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China. Electronic address: eeng@whu.edu.cn.Department of Environmental Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China.Department of Environmental Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25259475

Citation

Cai, Chun, et al. "Electrochemical Enhanced Heterogeneous Activation of Peroxydisulfate By Fe-Co/SBA-15 Catalyst for the Degradation of Orange II in Water." Water Research, vol. 66, 2014, pp. 473-485.
Cai C, Zhang H, Zhong X, et al. Electrochemical enhanced heterogeneous activation of peroxydisulfate by Fe-Co/SBA-15 catalyst for the degradation of Orange II in water. Water Res. 2014;66:473-485.
Cai, C., Zhang, H., Zhong, X., & Hou, L. (2014). Electrochemical enhanced heterogeneous activation of peroxydisulfate by Fe-Co/SBA-15 catalyst for the degradation of Orange II in water. Water Research, 66, 473-485. https://doi.org/10.1016/j.watres.2014.08.039
Cai C, et al. Electrochemical Enhanced Heterogeneous Activation of Peroxydisulfate By Fe-Co/SBA-15 Catalyst for the Degradation of Orange II in Water. Water Res. 2014 Dec 1;66:473-485. PubMed PMID: 25259475.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Electrochemical enhanced heterogeneous activation of peroxydisulfate by Fe-Co/SBA-15 catalyst for the degradation of Orange II in water. AU - Cai,Chun, AU - Zhang,Hui, AU - Zhong,Xin, AU - Hou,Liwei, Y1 - 2014/09/03/ PY - 2014/05/30/received PY - 2014/08/18/revised PY - 2014/08/24/accepted PY - 2014/9/27/entrez PY - 2014/9/27/pubmed PY - 2015/8/1/medline KW - Electrochemical KW - Fe-Co/SBA-15 KW - Mineralization KW - Peroxydisulfate KW - Sulfate radicals SP - 473 EP - 485 JF - Water research JO - Water Res. VL - 66 N2 - Mesoporous silica SBA-15 supported iron and cobalt catalysts (Fe-Co/SBA-15) were prepared and used in the electrochemical (EC) enhanced heterogeneous activation of peroxydisulfate (PDS, S2O8(2-)) process for the removal of Orange II. The effects of some important reaction parameters such as initial pH, current density, PDS concentration and dosage of Fe-Co/SBA-15 catalysts were investigated. The results showed that the decolorization efficiency was not significantly affected by the initial pH value, and it did increase with the higher PDS concentration, current density and Fe-Co/SBA-15 dosage. Both the sulfate radical (SO4(·-)) and the hydroxyl radical (OH) are considered as the primary reactive oxidants for the Orange II decolorization. The Fe-Co/SBA-15 catalyst maintained its high activity during repeated batch experiments. The intermediate products were identified by GC-MS analysis and a plausible degradation pathway is proposed accordingly. The removal efficiencies of chemical oxygen demand (COD) and total organic carbon (TOC) were 52.1% and 31.9%, respectively after 60 min of reaction time but reached 82.9% and 51.5%, respectively when the reaction time was extended to 24 h. Toxicity tests with activated sludge indicated that the toxicity of the solution increased during the first 30 min and then decreased as the oxidation proceeded. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/25259475/Electrochemical_enhanced_heterogeneous_activation_of_peroxydisulfate_by_Fe_Co/SBA_15_catalyst_for_the_degradation_of_Orange_II_in_water_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(14)00606-X DB - PRIME DP - Unbound Medicine ER -