Hu Jun, Wang Jian-long
Laboratory of Environmental Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.
Huan Jing Ke Xue. 2009 Oct 15;30(10):2936-9.
The radiolytical degradation of 3-chlorophenol (3-CP) in aqueous solution was investigated using gamma-radiation and gamma-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 x 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 gamma-irradiation/hydrogen peroxide for 3-CP degradation. The rate constant of 3-CP degradation for gamma-radiation and gamma-radiation/hydrogen peroxide combined process was 0.279 h(-1) and 0.542 h(-1), respectively.
采用γ辐射以及γ辐射/过氧化氢（H₂O₂）联合工艺，研究了水溶液中3-氯苯酚（3-CP）的辐射降解情况。通过测定3-CP的去除效率、总有机碳（TOC）的变化、脱氯率以及可见-紫外吸收光谱，研究了吸收剂量、3-CP初始浓度和H₂O₂添加量对污染物降解、脱氯和矿化程度的影响。还讨论了3-CP降解的动力学。结果表明，当3-CP浓度为10 mg·L⁻¹且吸收剂量为2 kGy时，脱氯率达到100%，TOC去除效率为53%；当吸收剂量增加到8 kGy时，3-CP可完全矿化，TOC去除效率达到100%。3-CP的辐射分解可用一级反应动力学描述，γ辐射/过氧化氢联合工艺对3-CP降解存在协同效应。γ辐射和γ辐射/过氧化氢联合工艺降解3-CP的速率常数分别为0.279 h⁻¹和0.542 h⁻¹。
