电催化臭氧技术去除水中草酸的研究

Study on the Degradation of Oxalic Acid in Water by Electro-peroxon Technology

研究了电催化臭氧过程中,溶液中草酸(OA)在不同条件下的降解效果。结果表明,在电催化臭氧反应体系中,O2在阴极得电子原位生成H2O2与O3反应产生HO·,从而实现难降解污染物的快速去除。电流为50 m A,O3含量越高,OA的去除效果越好;O3的质量浓度为75 mg/L,电流高于50 m A时,OA的去除率下降;相对于中性与碱性,酸性条件有利于电催化臭氧过程的进行,对OA的去除有更好的效果;与直接臭氧氧化和电解过程相比,电催化臭氧过程对于OA有较好的去处效果。在O3的质量浓度75 mg/L、电流50 m A的优化条件下,OA在180 min时的去除率达到99%。

Studied the degradation of oxalic acid (OA) solution under different conditions during the electro-peroxone process. The results showed that, in the electro-peroxone reaction system, O2 obtained electron to generate H2O2 at cathode, then H2O2 could react with O3 to produce HO. Thereby achieving removal of refractory pollutants rapidly. When the current was 50 mA, the greater the concentration of ozone, the better the removal effect of OA. When the mass concentration of O3 was 75 mg/L, the removal rate of OA was decreased when the current was above 50 mA. Compared with neutral and alkaline conditions, acidic conditions were favorable for the electrocatalytic ozone process and had a better effect on the removal of OA. The electro-peroxone process significantly improved the OA removal rate compared to the direct ozone oxidation and electrolysis process. When the mass concentration of O3 was 75 mg/L, the current conditions was 50 mA, the removal rate of oxalic acid could reach up to 99% at 180 min of reaction.