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邻苯二甲酸酯(PAEs)是环境内分泌干扰物之一。选取已列入我国环境优先控制污染物黑名单的邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)和邻苯二甲酸二丁酯(DBP)为对象进行γ辐射降解研究,结果表明:DMP、DEP和DBP能被γ辐照有效降解;辐照0.8 kGy,12 mg/L的DMP、DEP和DBP降解率分别为96.6%、94.5%和86.2%;辐照去除其总碳(TC)所需剂量远高于降解剂量,经2 kGy辐照其TC去除率分别仅为23.6%、14.3%、12.9%。HLCP、UV及其降解中间产物等分析都表明,DMP、DEP和DBP辐照去除分为高、低剂量两个阶段:在低剂量阶段,尽管DMP、DEP和DBP辐照后浓度降低,但实际上并未发生苯环裂解反应,要实现完全去除该类物质还需进行更高剂量辐照。最后对PAEs微污染饮用水进行模拟辐照并达到了去除目标。
Phthalates (PAEs) are one of the environmental endocrine disruptors. Select the China’s environmental priority control pollutants blacklist of phthalate (DMP), diethyl phthalate (DEP) and dibutyl phthalate (DBP) as the object of gamma radiation The results showed that DMP, DEP and DBP could be effectively degraded by γ irradiation. The degradation rates of DMP, DEP and DBP at irradiation doses of 0.8 kGy and 12 mg / L were 96.6%, 94.5% and 86.2% The required total carbon (TC) dose was much higher than the degradation dose. The TC removal rates after 2 kGy irradiation were only 23.6%, 14.3% and 12.9%, respectively. Analysis of HLCP, UV and their degradation intermediates showed that DMP, DEP and DBP irradiation were divided into two stages, high and low doses. In the low dose stage, although the concentrations of DMP, DEP and DBP decreased after irradiation, Did not occur on the benzene ring cleavage reaction, to achieve the complete removal of these substances also need higher doses of radiation. Finally, PAEs micro-contaminated drinking water was simulated and reached the target of removal.