摘要
采用UV/H2O2间歇式光氧化反应器,研究了溶液pH值、腐殖酸及水中常见阴离子HCO3-、NO3-、CO32-、Cl-和SO42-对UV/H2O2工艺降解17α-乙炔基雌二醇(EE2)的影响.结果表明,UV/H2O2工艺可以有效地去除水中的EE2,光降解过程符合一级反应动力学模型.双氧水投加量为5 mg/L时,在14W低压汞灯照射下,EE2在自来水和蒸馏水中的光降解一级反应速率常数为0.063 0min-1和0.132 4min-1.溶液中的腐殖酸和阴离子HCO3-、NO3-、Cl-、SO42-对EE2的光降解反应有抑制作用,4种阴离子浓度为5 mmol/L时,抑制作用依次为HCO3->SO42->Cl->NO3-,HCO3-可使光降解速率常数降低到50%.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水中多种离子影响的结果.
Effect of pH, HA and anions HCO3^-, NO3^- , CO3^2- , Cl^- and SO4^2- in aqueous solution on the photodegradation of 17α- ethynyestradiol（EE2）was studied by using a batch photo-reactor. The results show that 17α-ethynyestradiol（EE2） could be removed effectively by the UV/H2O2 process. The rate of photodegradation in aqueous solution follows first-order kinetics. When H2O2 was dosed as 5 mg/L, irradiated by a 14W low pressure mercury vapor discharge lamp, the first-order photodegradation rate constant of EE2 in distilled water and tap water were 0.063 0min^-1 and 0. 132 4min^-1 respectively. HA,HCO3^-, NO3^- ,Cl^- and SO4^2- have inhibitory action on EE2 photodegradation, when their concentrations at 5 mmol/L,their inhibitory action： HCO3^- 〉 SO4^2- 〉 Cl^- 〉 NO3^-. HCO3^- induced photodegradation rate constant of EE2 reduced by half, h was anions synthesize effect that caused photodegradation rate constant of EE2 in tap water lower than distilled water.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2006年第10期2050-2056,共7页
Environmental Science
基金
国家高技术研究发展计划(863)项目(2002AA601130)
国家科技攻关计划重大项目(2003BA808A17)
关键词
UV/H2O2
EE2
阴离子
光降解速率常数
内分泌干扰物
UV/H2O2
17α-ethynyestradiol
anions
photodegradation rate constant
endocrine disrupting chemicals
