| 引用本文: | 向平,连慧兰,王韬,江雨竹,薛英浩.活性炭纤维/泡沫镍阴极的电化学工艺除藻效能[J].哈尔滨工业大学学报,2019,51(8):46.DOI:10.11918/j.issn.0367-6234.201807159 |
| XIANG Ping,LIAN Huilan,WANG Tao,JIANG Yuzhu,XUE Yinghao.Efficiency and mechanism of algae removal by electrochemical technique using activated carbon fiber/nickel foam cathode[J].Journal of Harbin Institute of Technology,2019,51(8):46.DOI:10.11918/j.issn.0367-6234.201807159 |
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| 摘要: |
| 蓝藻爆发问题长期严重影响饮用水安全,为此,发展有效的技术控制和减少藻类的繁殖尤为迫切.以钛基铂电极（Pt/Ti）为阳极,活性炭纤维/泡沫镍电极（ACF/Ni）为阴极,通过考察阴极材料（ACF/Ni和不锈钢）、铁投加浓度及价态对电化学除藻的影响,探究Pt/Ti-ACF/Ni-Fe2+电化学体系对藻类的去除效果和机制.结果表明,当Fe2+投加浓度为0.05 mmol/L、电流密度为50 mA/cm2、极板间距为1.0 cm、初始pH为6.0、初始藻细胞密度为1.2×109～1.4×109个/L时,电化学处理15 min,藻细胞的去除率为93%.基于对各实验中铁离子浓度、H2O2浓度及pH的分析,·OH的间接检测,ACF的红外光谱分析,藻细胞和ACF/Ni的电镜扫描以及ACF的比表面积分析,探究Pt/Ti-ACF/Ni-Fe2+电化学体系的除藻机理.在Pt/Ti-ACF/Ni-Fe2+电化学除藻体系中,H2O2通过电化学还原在ACF/Ni阴极表面高效产生,反应过程中产生固相铁附着于ACF表面并发生Fe（Ⅲ）还原为Fe（Ⅱ）的反应,同时产生羟基自由基,电化学除藻的主要机理是均相电Fenton和非均相电Fenton反应. |
| 关键词: 活性炭纤维电极 电化学 过氧化氢 藻 去除率 |
| DOI：10.11918/j.issn.0367-6234.201807159 |
| 分类号:X703 |
| 文献标识码:A |
| 基金项目:“十二五” 国家科技支撑计划项目(2012BAJ25B06-001) |
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| Efficiency and mechanism of algae removal by electrochemical technique using activated carbon fiber/nickel foam cathode |
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XIANG Ping,LIAN Huilan,WANG Tao,JIANG Yuzhu,XUE Yinghao
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(Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment (Chongqing University), Ministry of Education, Chongqing 400045, China)
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| Abstract: |
| 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. |
| Key words: activated carbon fiber electrode electrochemistry hydrogen peroxide algae removal efficiency |
