Efficiency and mechanism of algae removal by electrochemical technique using activated carbon fiber/nickel foam cathode

被引：0

作者：

Xiang P. ^{[1
]}

Lian H. ^{[1
]}

Wang T. ^{[1
]}

Jiang Y. ^{[1
]}

Xue Y. ^{[1
]}

机构：

[1] Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Chongqing University, Ministry of Education, Chongqing

来源：

Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | 2019年 / 51卷 / 08期

关键词：

Activated carbon fiber electrode; Algae; Electrochemistry; Hydrogen peroxide; Removal efficiency;

D O I：

10.11918/j.issn.0367-6234.201807159

中图分类号：

学科分类号：

摘要：

Since the pollution of algae blooms has seriously affected drinking water safety for a long time, it is urgent to develop effective techniques to control and reduce algal reproduction. By using Pt/Ti anode and ACF/Ni cathode, effects of the parameters such as cathode materials (ACF/Ni and stainless steel) as well as the concentration and valence state of iron added on the electrochemical removal of algae were investigated to explore the removal efficiency and mechanism of algae in the Pt/Ti-ACF/Ni-Fe2+ electrochemical system. Results showed that under the conditions of Fe2+ concentration of 0.05 mmol/L, current density of 50 mA/cm2, inter-electrode gap of 1.0 cm, initial pH of 6.0, and initial algal cell density of 1.2×109-1.4×109 cells/L, 93% of the algae cells were removed in 15 min. Based on the analyses of ferric ion concentration, H2O2 concentration, and pH in the experiments, indirect detection of •OH, FTIR analysis of ACF, SEM images of algae, and ACF/Ni and BET analyses of ACF, mechanism of algae removal was revealed in the Pt/Ti-ACF/Ni-Fe2+ system. H2O2 was generated efficiently through electrochemical reduction on the surface of the ACF/Ni cathode, the iron in solid phase generated during the reaction was precipitated on the surface of ACF/Ni cathode with the electrochemical reduction of Fe(Ⅲ) to Fe(Ⅱ), and meanwhile •OH would be generated in the Pt/Ti-ACF/Ni-Fe2+ algae removal system. Heterogeneous and homogenous electro-Fenton processes were the main mechanism in the Pt/Ti-ACF/Ni-Fe2+ algae removal system. © 2019, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.

引用

页码：46 / 53

页数：7

共 27 条

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