• 关键词：γ辐照  五氯酚(PCP)  协同效应  过氧化氢(H₂O₂)

• 基金项目：国家自然科学基金(No.10876016,50978145);国家高技术研究发展计划项目(No.2009AA063905)

• 余少青
• 清华大学核能与新能源技术研究院环境技术研究室, 北京 100084

• 胡俊
• 清华大学核能与新能源技术研究院环境技术研究室, 北京 100084

• 王建龙
• 1. 清华大学核能与新能源技术研究院环境技术研究室, 北京 100084; 2. 清华大学环境模拟与污染控制国家重点联合实验室, 北京 100084

• 摘要：研究了水溶液中的五氯酚(PCP)在γ辐照和过氧化氢(H₂O₂)联合作用下的降解.PCP的初始浓度为27.7mg·L^-1,外加H₂O₂的初始浓度为0、50和100mg·L^-1.结果表明,PCP在不同条件下的辐照降解符合准一级动力学方程.当外加H₂O₂的初始浓度在0～100mg·L^-1时,PCP的去除率、矿化率和脱氯率随H₂O₂添加量的增加而增大.当吸收剂量为12kGy时,PCP几乎完全去除,氯几乎完全释放.然而,总有机碳(TOC)的去除率远低于PCP的去除率.当吸收剂量为12kGy,外加H₂O₂的初始浓度分别为0.50和100mg·L^-1时,TOC的去除率仅分别为25%、40%和54%.用LC/MS和IC检测了包括羧酸在内的主要中间产物,探讨了水溶液中PCP可能的辐照降解机理.

• Abstract：The synergistic decomposition of pentachlorophenol(PCP) was performed by gamma irradiation with hydrogen peroxide(H₂O₂) in aqueous solution. The PCPsolution with initial concentration of 27.7 mg·L^-1 was irradiated in the presence of extra H₂O₂ at initial concentrations of 0,50,and 100 mg·L^-1. The experimental results showed that the decomposition of PCPconformed to pseudo first-order reaction kinetics under all applied conditions. When the initial H₂O₂ concentration was in the range of 0～100 mg·L^-1,a higher concentration of H₂O₂ was more effective for the decomposition,mineralization and chlorine release of PCP. The removal of PCPand chlorine release were almost complete at an adsorbed dose of 12 kGy. However,the removal of total organic carbon(TOC) was not as effective as that of PCP. At an adsorbed dose of 12 kGy with initial H₂O₂ concentrations of 0,50,and 100 mg·L^-1,the removal efficiencies of TOCwere only approximately 25%,40%,and 54%,respectively. Major intermediates,including carboxylic acids were identified by LC/MSand IC. Possible reactions in radiolytic decomposition of PCPin aqueous solution are proposed.

• Key words：Gamma radiation  pentachlorophenol (PCP)  synergistic effect  hydrogen peroxide (H₂O₂)

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