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Electrochemical activation of sulfate by BDD anode in basic medium for efficient removal of organic pollutants.
Chemosphere. 2018 Nov; 210:516-523.C

Abstract

Electrochemical advanced oxidation processes (EAOPs) based on hydroxyl radicals (OH) have some limitations when they are applied to real wastewater treatment, such like strict requirements on pH (acidic electrolyte) and high energy consumption. Compared to OH, Sulfate radicals (SO4-) have high redox potential in wider range of pH (2-9). In this study, SO4- were efficiently produced by electrochemical activation of SO42- at boron doped diamond (BDD) anode. The degradation rate of 2,4-DCP (k = 0.828 ± 0.05 h-1) in the presence of Na2SO4 was approximately 4 times than that without Na2SO4 (k = 0.219 ± 0.01 h-1), indicating that SO4- exhibited higher reactivity than OH at initial pH = 9. Moreover, the amount of O2 decreased by 65% after 100 min during electro-oxidation of 2,4-DCP and the specific energy consumption per unit TOC (ECTOC) was reduced by 70% when the concentration of Na2SO4 increased from 0.01 to 0.1 M. The impact of sulfate ions in the electrochemical advanced oxidation were investigated. Electron spin resonance (ESR) measurements were conducted to identify the formation of SO4-. Electrolysis of 2,4-DCP with specific radical scavengers (ethanol and tert-Butanol) were conducted and the results revealed that SO4- were mainly produced by one-electron loss of sulfate at basic condition. Electro-generation persulfate was measured and participation of non-radical activation of persulfate was investigated. O2 production was quantified and we found electrochemical activation of sulfate could inhibit water dissociation. Taken all findings, a mechanism of electrochemical activation of sulfate at BDD anode was summarized. This technology eliminates the requirement for pH adjustment for wastewater treatment and makes EAOPs more effective and economic as well.

Authors+Show Affiliations

Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, PR China.Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, PR China.Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, PR China.Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, PR China.Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, PR China. Electronic address: xwzhang@zju.edu.cn.Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, PR China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30025370

Citation

Chen, Luchuan, et al. "Electrochemical Activation of Sulfate By BDD Anode in Basic Medium for Efficient Removal of Organic Pollutants." Chemosphere, vol. 210, 2018, pp. 516-523.
Chen L, Lei C, Li Z, et al. Electrochemical activation of sulfate by BDD anode in basic medium for efficient removal of organic pollutants. Chemosphere. 2018;210:516-523.
Chen, L., Lei, C., Li, Z., Yang, B., Zhang, X., & Lei, L. (2018). Electrochemical activation of sulfate by BDD anode in basic medium for efficient removal of organic pollutants. Chemosphere, 210, 516-523. https://doi.org/10.1016/j.chemosphere.2018.07.043
Chen L, et al. Electrochemical Activation of Sulfate By BDD Anode in Basic Medium for Efficient Removal of Organic Pollutants. Chemosphere. 2018;210:516-523. PubMed PMID: 30025370.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Electrochemical activation of sulfate by BDD anode in basic medium for efficient removal of organic pollutants. AU - Chen,Luchuan, AU - Lei,Chaojun, AU - Li,Zhongjian, AU - Yang,Bin, AU - Zhang,Xingwang, AU - Lei,Lecheng, Y1 - 2018/07/12/ PY - 2018/05/15/received PY - 2018/07/06/revised PY - 2018/07/09/accepted PY - 2018/7/20/pubmed PY - 2018/10/16/medline PY - 2018/7/20/entrez KW - Basic mediums KW - Boron doped diamond anode KW - Electrochemical advanced oxidation processes KW - Sulfate radicals SP - 516 EP - 523 JF - Chemosphere JO - Chemosphere VL - 210 N2 - Electrochemical advanced oxidation processes (EAOPs) based on hydroxyl radicals (OH) have some limitations when they are applied to real wastewater treatment, such like strict requirements on pH (acidic electrolyte) and high energy consumption. Compared to OH, Sulfate radicals (SO4-) have high redox potential in wider range of pH (2-9). In this study, SO4- were efficiently produced by electrochemical activation of SO42- at boron doped diamond (BDD) anode. The degradation rate of 2,4-DCP (k = 0.828 ± 0.05 h-1) in the presence of Na2SO4 was approximately 4 times than that without Na2SO4 (k = 0.219 ± 0.01 h-1), indicating that SO4- exhibited higher reactivity than OH at initial pH = 9. Moreover, the amount of O2 decreased by 65% after 100 min during electro-oxidation of 2,4-DCP and the specific energy consumption per unit TOC (ECTOC) was reduced by 70% when the concentration of Na2SO4 increased from 0.01 to 0.1 M. The impact of sulfate ions in the electrochemical advanced oxidation were investigated. Electron spin resonance (ESR) measurements were conducted to identify the formation of SO4-. Electrolysis of 2,4-DCP with specific radical scavengers (ethanol and tert-Butanol) were conducted and the results revealed that SO4- were mainly produced by one-electron loss of sulfate at basic condition. Electro-generation persulfate was measured and participation of non-radical activation of persulfate was investigated. O2 production was quantified and we found electrochemical activation of sulfate could inhibit water dissociation. Taken all findings, a mechanism of electrochemical activation of sulfate at BDD anode was summarized. This technology eliminates the requirement for pH adjustment for wastewater treatment and makes EAOPs more effective and economic as well. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/30025370/Electrochemical_activation_of_sulfate_by_BDD_anode_in_basic_medium_for_efficient_removal_of_organic_pollutants_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(18)31301-8 DB - PRIME DP - Unbound Medicine ER -