摘要
研究了UV/H2O2工艺对直链烷基苯磺酸钠(LAS)的去除效果以及水中常见无机阴离子对LAS降解的影响和机理.结果表明,UV/H2O2工艺可以有效的去除水中LAS,光降解过程符合一级反应动力学模型.在H2O2投加量为8 mg.L-1,14 W低压汞灯照射下,LAS在蒸馏水和自来水中光降解速率常数分别为0.0180 min-1和0.0122 min-1;NO3-、Cl-、SO42-和HCO3-对LAS光降解有抑制作用,4种离子在浓度分别为5、10、15 mmol.L-1时,对LAS光降解的抑制程度均为HCO3->NO3->Cl->SO42-;随着离子浓度增大,抑制作用增强;自来水中的光降解速率常数低于蒸馏水中的光降解速率常数是由于水中多种离子影响的结果.
Experiments are carried out to study the effects and mechanisms of inorganic anions in water on the degradation of linear alkyl benzene sulfonate （LAS） in UV/H2O2 process. The results show that UV/H2O2 process could remove LAS effectively, and the rate of photodegradation follows first-order reaction kinetics model. Under the condition that H2O2 concentration was 8 mg·L^-1 and a 14 W low pressure mercury vapor discharge lamp irradiated samples, the first-order photodegradation rate constant of LAS in distilled water and tap water were 0.018 0 min^-1 and 0.012 2 min^-1 respectively. NO3^- , Cl^- , SO4^2- and HCO3^- have inhibitory action on LAS photodegradation. The higher inorganic anions concentration was, the stronger inhibitory action. When their concentrations were 5.10 and 15 mmol·L^-1 respectively, their inhibitory action order was HCO3^- 〉 NO3^- 〉 Cl- 〉 SO4^2- all the time. It was anions synthetical effect that caused photodegradation rate constant of LAS in tap water lower than distilled water.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2007年第11期2539-2543,共5页
Environmental Science
基金
国家高技术研究发展计划(863)项目(2002AA601022)
辽宁省教育厅青年基金项目(2005246)
