g-C_3N_4-TiO_2光催化电极耦合生物产电阳极还原硝酸根

以g-C_3N_4-TiO_2为光催化阴极,耦合生物阳极进行光催化还原硝酸盐研究。考察了空穴清除剂、曝气条件、生物阳极对光催化还原硝酸盐的影响,并对还原机理进行分析。结果表明在曝氮气、有生物阳极时硝酸盐去除效果最好,空穴清除剂对硝酸盐还原影响较小。反应210 min后硝酸盐去除率为72.57%,副产物亚硝酸盐浓度为0.31 mg·L~(-1),氨氮未检出。经重复实验后,负载的催化剂不脱落,催化剂活性基本不变,可重复使用。

Reduction of Nitrate by g-C3N4-TiO2 Photocatalyst on Electrode Coupled with Electricity Generating Bio-anode

Photocatalytic reduction of nitrate and/or nitrite is performed using g-C₃N₄-TiO₂ as photocatalytic cathode combined with electricity generating bio-anode. Effect on photocatalytic reduction of nitrate is investigated from hole scavenger, aeration conditions and biological anode, respectively, and the reduction mechanism is analyzed. The result shows that the system has the best removal efficiency with a biological anode and exposure to nitrogen, while hole scavenger has the least effect on photocatalytic reduction. The removal of nitrate is 72.57% and the concentration of nitrite(by-product) is 0.31 mg·L^-1 after 210 min of reaction, while ammonia is not detected. The supported catalyst does not fall off and the catalyst activity remains essentially unchanged after repeated experiments, which means the catalyst and electrode can be reused.