光催化电化学联合降解水中苯酚的研究  

Study on synergetic degradation of phenol by independent electrochemical and photocatalytic processes

作　　者：张峰[1,4] 李文奇[2] 冯传平[1] 郭旭[3] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083 [2]中国水利水电科学院水环境研究所,北京100038 [3]筑波大学生命与环境科学院,日本筑波305-8572 [4]太原理工大学环境科学与工程学院,太原030024

出　　处：《环境工程学报》2011年第10期2161-2166,共6页Chinese Journal of Environmental Engineering

基　　金：国家“十一五”科技支撑重点项目(2006BAD01B03);国家高技术研究发展计划(863)项目(2007AA06Z351)

摘　　要：采用电化学、光催化联合工艺降解水中苯酚,在对其降解机理、反应动力学进行分析的基础上,考察了电解质浓度、电流密度及溶液pH等控制因素对降解速率的影响。实验结果表明:电化学和光催化同时作用时,产生了协同作用;以氯化钠为电解质可增强协同作用;光电联合工艺降解苯酚符合准一级反应动力学;弱酸性环境有利于降解反应的进行。在电流密度30 mA/cm2、NaCl添加量0.3 g/L、pH为6左右的条件下降解初始浓度50 mg/L苯酚废水,2.5 h苯酚被完全去除,6 h后TOC去除率达到75%。In this study,a phenol wastewater was treated by the combined process of independent photocatalysis and electrolysis.Based on the analysis of the reaction kinetics and the mechanism of combined degradation,the influence of NaCl dosage,current density and pH on the degradation rates was investigated.The results showed that the synergetic enhancement effect was produced in the combined process,and promoted significantly in the presence of sodium chloride.The combined degradation of phenol followed the pseudo-first order reaction kinetics.The optimum pH range for combined degradation was in weak acidic.With the current density of 30 mA/cm2,NaCl dosage of 0.3 g/L and pH 6,50 mg/L phenol was completely degraded after 2.5 h,and 75% of TOC were removed after 6 h.

关 键 词：光电联合 Ti/RuO2-Pt UV P25 协同作用 苯酚 

分 类 号：X703[环境科学与工程—环境工程]