载铁ACF/Ni阴极电化学体系除藻效能与机制

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0.7×10⁹~0.8×10⁹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.

Efficiency and mechanism of algae removal by electrochemical system using iron-loaded ACF/Ni cathode

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 0.7×10⁹~0.8×10⁹cells/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.