γ辐照和H2O2联合作用下五氯酚(PCP)的降解

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27.7 mg·L-1,外加H2O2的初始浓度为0、50和100 mg·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0～100 mg·L-1时,PCP的去除率、矿化率和脱氯...

Gamma radiation-induced decomposition of pentachlorophenol(PCP) in the presence of hydrogen peroxide(H2O2) in aqueous solution

The synergistic decomposition of pentachlorophenol (PCP) was performed by gamma irradiation with hydrogen peroxide (H2O2) in aqueous solution. The PCP solution 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 PCP conformed 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 PCP and 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 TOC were only approximately 25%, 40%, and 54%, respectively. Major intermediates, including carboxylic acids were identified by LC/MS and IC. Possible reactions in radiolytic decomposition of PCP in aqueous solution are proposed.