摘要
利用60Coγ-射线辐照3-氯酚(3-CP)水溶液,研究了其辐射降解特性.通过测量辐射后3-氯酚的去除率、紫外-可见光谱、脱氯率、总有机碳(TOC)去除率等,探讨了吸收剂量、氯酚初始浓度、H2O2加入对氯酚降解效果的影响,并初步探讨了氯酚降解动力学特性.结果表明,当3-氯酚浓度为10 mg.L-1,辐射剂量为2 kGy时,脱氯率可达100%,TOC去除率达53%;当辐射剂量提高到8 kGy时,3-氯酚可完全矿化,TOC去除率达100%.3-氯酚的辐照降解过程可用一级反应动力学方程拟合.氯酚单独γ-辐射以及辐照/H2O2联合处理的一级反应动力学常数k分别为0.279 h-1和0.542 h-1.
The radiolytical degradation of 3-chlorophenol（3-CP） in aqueous solution was investigated using γ-radiation and γ-radiation/ hydrogen peroxide（H2O2） combined process.The effect of absorbed dose,initial concentration of 3-CP and addition of H2O2 on pollutant degradation,dechlorination and the degree of mineralization was studied by measuring the removal efficiency of 3-CP,the variation of total organic carbon （TOC）,the dechlorination rate,and the absorbance spectrum of vis-UV.The kinetics of 3-CP degradation was also discussed.The results showed that when 3-CP concentration was 10（mg·L-1） and the absorbed dose was 2 kGy,the dechlorination rate reached 100%,the TOC removal efficiency was 53%;when the absorbed dose increased to 8 kGy,3-CP could be completely mineralized and the TOC removal efficiency reached 100%.The radiolysis of 3-CP could be described by one-order reaction kinetics,there existed synergic effect for combined process of γ-irradiation/hydrogen peroxide for 3-CP degradation.The rate constant of 3-CP degradation for γ-radiation and γ-radiation/hydrogen peroxide combined process was 0.279 h^-1 and 0.542 h^-1,respectively.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第10期2936-2939,共4页
Environmental Science
基金
国家自然科学基金项目(10876016)
