半亲半疏阴极催化电芬顿工艺去除罗丹明B的性能

Performance of electro-Fenton oxidation with the Janus electrode on rhodamine B removal

为解决传统曝气式电芬顿系统中氧气的传质限制和低效利用问题,利用石墨毡疏水化处理与催化剂涂覆的方法制备了一种非对称浸润性的半亲半疏阴极,且对半亲半疏阴极进行了结构表征和电化学性能测试,考察了阴极浸润性、阴极电势和曝气速率对有机污染物去除的影响。结果表明:在−0.4 V(vs.Ag/AgCl)和6 mL·min^(−1)的曝气速率下,半亲半疏阴极在32 min内的罗丹明B去除率高达89.4%,是亲水阴极的8.0倍和疏水阴极的2.2倍,这主要得益于疏水化石墨毡基底的良好O_(2)储存能力以及亲水催化剂层的较大电化学活性面积。

To address the problems of oxygen mass transfer limitation and low O_(2)-utilization efficiency in conventional aeration-based electro-Fenton(EF)system,the Janus cathode with asymmetric wettability was successfully fabricated by hydrophobic treatment of graphite felt and catalyst coating.Its structure characterization and electrochemical performance test were performed,and the effects of wettability,cathode potential and aeration rate on organic pollutants removal were also investigated.The result showed that at the potential of−0.4 V and the aeration rate of 6 mL·min^(−1),the removal rate of rhodamine B was 89.4%in the reactor with Janus cathode,which was 8.0 times that with hydrophilic cathode and 2.2 times that with hydrophobic cathode.This good organics removal performance of Janus cathode was attributed to the excellent O_(2)storage ability in three-dimensional hydrophobic graphite felt substrate and large electrochemical active area in hydrophilic catalyst layer.