采用新型TiO₂/Ti-Fe-石墨毡光电催化氧化工艺降解2,4-二氯苯酚

Degradation of 2,4-dichlorophenol with a novel TiO2/Ti-Fe-graphite felt photoelectrocatalytic oxidation process.

作者信息

Zhao Bao-xiu, Li Xiang-zhong, Wang Peng

机构信息

School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.

出版信息

J Environ Sci (China). 2007;19(8):1020-4. doi: 10.1016/s1001-0742(07)60165-x.

DOI:10.1016/s1001-0742(07)60165-x

PMID:17966860

Abstract

Degradation of 2,4-dichlorophenol (2,4-DCP) was studied in a novel three-electrode photoelectrocatalytic (PEC) integrative oxidation process, and the factors influencing the degradation rate, such as applied current, flow speed of O2, pH, adscititious voltage and initial 2,4-DCP concentration were investigated and optimized. H2O2 was produced nearby cathode and Fe2+ continuously generated from Fe anode in solution when current and O2 were applied, so, main reactions, H2O2-assisted TiO2 PEC oxidation and E-Fenton reaction, occurred during degradation of 2,4-DCP in this integrative system. The degradation ratio of 2,4-DCP was 93% in this integrative oxidation process, while it was only 31% in E-Fenton process and 46% in H2O2-assisted TiO2 PEC process. So, it revealed that the degradation of 2,4-DCP was improved greatly by photoelectrical cooperation effect. By the investigation of pH, it showed that this integrative process could work well in a wide pH range from pH 3 to pH 9.

摘要

在一种新型的三电极光电催化（PEC）一体化氧化过程中研究了2,4-二氯苯酚（2,4-DCP）的降解情况，并对影响降解速率的因素，如施加电流、O₂流速、pH值、外加电压和初始2,4-DCP浓度进行了研究和优化。当施加电流和O₂时，在阴极附近产生H₂O₂，溶液中的Fe阳极不断产生Fe²⁺，因此，在该一体化体系中2,4-DCP降解过程中发生了主要反应，即H₂O₂辅助TiO₂ PEC氧化和E-Fenton反应。在该一体化氧化过程中2,4-DCP的降解率为93%，而在E-Fenton过程中仅为31%，在H₂O₂辅助TiO₂ PEC过程中为46%。所以，这表明光电协同效应大大提高了2,4-DCP的降解效果。通过对pH值的研究表明，该一体化过程在pH值为3至9的较宽范围内都能良好运行。