摘要
采用化学浸渍法将Fe@Fe2O3纳米线负载在活性炭纤维/泡沫镍上组成Fe@Fe2O3/ACF/Ni复合阴极,以钛基铂(Pt/Ti)为阳极,考察载铁量、初始pH值和不同电化学体系对除藻效果的影响,探究无供氧条件下Pt/Ti-Fe@Fe2O3/ACF/Ni电化学体系除藻的效能;基于⋅OH间接检测、铁离子浓度、H2O2浓度及pH值的分析和⋅O2-的检测研究Pt/Ti-Fe@Fe2O3/ACF/Ni中性电化学体系反应机制.结果表明,当制备阴极阶段投加0.03g FeCl3⋅6H2O,初始藻浓度为0.7×10^9~0.8×10^9个/L,电流密度为75mA/cm2,初始pH6.2时,电解60min,该体系除藻率可达到92.3%.在Pt/Ti-Fe@Fe2O3/ACF/Ni电化学体系中,Fe@Fe2O3/ACF/Ni阴极可通过电化学反应产生大量⋅OH和⋅O2-,使藻细胞破裂死亡;该体系除藻的主要机理是非均相电Fenton反应.
The efficiency of algae removal of a novel Pt/Ti-Fe@Fe2O3/ACF/Ni electrochemical system with an iron-loaded activated carbon fiber(ACF)/nickel foam(Ni)composite cathode formed by loading Fe@Fe2O3 nanowires on ACF/Ni with chemical impregnation method and Ti-based platinum(Pt/Ti)anode was investigated without oxygen supply and under different iron loads and initial pH condition and compared with other electrochemical systems.And the corresponding reaction mechanism of Pt/Ti-Fe@Fe2O3/ACF/Ni neutral electrochemical system was studied based on the indirect measurement of⋅OH,analysis of the concentration of iron ion and H2O2,pH value,and measurement of⋅O2-.The algae removal efficiency of the novel electrochemical system could reach 92.3%under the condition of 0.03g FeCl3⋅6H2O addition at the preparation stage of the cathode,the initial algal concentration of 0.7×10^9~0.8×10^9cells/L,the current density of 75mA/cm2,and initial pH value of 6.2 after electrolyzed for 60min.In the Pt/Ti-Fe@Fe2O3/ACF/Ni electrochemical system,a large number of⋅OH and⋅O2-were produced around the Fe@Fe2O3/ACF/Ni cathode through the electrochemical reaction,which could make algal cells to break down and die.The primary mechanism of algae removal in this system could be the heterogeneous Electro-Fenton reaction.
作者
向平
江雨竹
姜文超
张智
薛英浩
李梦颖
莫静宇
XIANG Ping;JIANG Yu-zhu;JIANG Wen-chao;ZHANG Zhi;XUE Ying-hao;LI Meng-ying;MO Jing-yu(Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400045,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2020年第11期5010-5019,共10页
China Environmental Science
基金
国家自然科学基金资助项目(51778082)。
