UV/H_2O_2和UV/TiO_2/H_2O_2去除水中微量硝基苯的比较研究  

A comparative study on removal of trace nitrobenzene in water by UV/H_2O_2 and UV/TiO_2/H_2O_2

作　　者：尹菁菁[1] 张彭义[1] 孙莉[2] 

机构地区：[1]清华大学环境科学与工程系,北京100084 [2]中国地质大学水资源与环境学院,北京100084

出　　处：《给水排水》2006年第z1期84-88,共5页Water & Wastewater Engineering

基　　金：教育部新世纪优秀人才支持计划(NCET-04-0090);北京科技新星计划(2004A39)

摘　　要：研究比较了UV／H2O2和UV／TiO2／H2O2对水中微量硝基苯的降解效果,并考察了水中常见HCO3-和腐殖酸对硝基苯降解的影响。结果表明,薄膜状TiO2的存在对UV／H2O2降解硝基苯有显著的促进作用,在最佳H2O2投加量2．1 mg／L时,UV／TiO2／H2O2的反应速率常数比UV／H2O2高32．8％;2 min内UV／TiO2／H2O2对硝基苯的去除率达到80％以上。HCO3-和腐殖酸对硝基苯降解有很强的抑制作用,HCO3-和腐殖酸浓度分别为2 mmo1／L和3．2 mg／L时,UV／TiO2／H2O2对硝基苯的反应速率常数分别下降84．6％6和92．2％。The degradation of trace nitrobenzene in water by UV/H2O2 and UV/TiO2/H2O2 was compared, as well as the influences of bicarbonate ion and humic acid. The results showed that, the presence of film TiO2 photocatalyst significantly stimulated the degradation of nitroben zene by UV/H2O2. The reaction rate constant of UV/TiO2/H2O2 was 32. 8% higher than that of UV/H2O2 when the optimally dosage of hydrogen peroxide (2. 1 mg/L) was added. Nitrobenzene was removed more than 80% in 2 minutes. Both bicarbonate ion and humic acid greatly inhibited the degradation of nitrobenzene by UV/H2O2 and UV/TiO2/H2O2. The reaction rate constants of UV/TiO2/H2O2 were respectively reduced 84. 6% and 92. 2% when the concentrations of bicarbon ate and humic acid were 2 mmol/L and 3. 2 mg/L separately.

关 键 词：UV/H2O2 UV/TiO2/H2O2 硝基苯 NAHCO3 腐殖酸 

分 类 号：TU991[建筑科学—市政工程] TU992