【摘要】 1,2,3-三氯丙烷（TCP）是一种新兴的人工合成有机污染物,其造成的地下水污染问题日益严重,有效的治理方法亟待探索。为明确不同氧化还原方法对TCP的降解效果,选用自制的绿茶还原纳米铁（GT-NZVI）、纳米零价锌（NZVZ）及活化过硫酸盐3种化学修复剂,分别开展对TCP的降解试验。结果表明:GT-NZVI颗粒具有较好的分散性,但对TCP的降解效果不明显;利用羧甲基纤维素（CMC）作为悬浮剂可实现NZVZ在水溶液中的稳定悬浮,且能有效降解TCP,36h后TCP基本降解完全,反应符合准一级动力学方程,反应速率常数为0.10h^-1;利用柠檬酸（CA）作为螯合剂,Fe²⁺活化过硫酸盐高级氧化技术可以有效降解TCP,当S₂O₈^2-、Fe²⁺、CA摩尔比为20∶5∶1时,反应24h,TCP降解率为40.8%,反应符合准一级动力学方程,反应速率常数及半衰期分别为0.11d^-1和6.3d。更多还原

【Abstract】 1,2,3-trichloropropane（TCP）is a new emerging artificially synthesized organic pollutant.The groundwater pollution caused by TCP is becoming increasingly serious,and hence there is an urgent need to explore effective treatment measures.In order to investigate the effects of different redox methods on the degradation of TCP,three different chemical reagents,nanoscale zero-valent iron（NZVI）prepared by green tea（GT-NZVI）,nanoscale zero-valent zinc（NZVZ）and activated persulfate(S₂O₈^2-),were selected to carry out a TCP degradation experiment.The results showed that the GT-NZVI particles had good dispersibility,but its degradation effect on TCP was not obvious.The stable suspension of NZVZ in aqueous solution could be achieved by using carboxymethyl cellulose（CMC）as a suspending agent,and it could effectively degrade TCP.After 36 hof reaction,TCP was almost completely degraded.The reduction reaction conformed to the pseudo first-order kinetic equation,and the reaction rate constant was 0.10 h^-1.Using citric acid（CA）as the chelating agent,advanced oxidation technology of Fe²⁺-activated persulfate could also effectively degrade TCP.When the molar ratio of S₂O₈^2-,Fe²⁺ and CA was 20∶5∶1,the degradation rate of TCP was 40.8% after 24 h.The oxidation reaction also satisfied the pseudo first-order kinetic equation,and the reaction rate constant and half-life were 0.11 d^-1 and 6.3 d,respectively.更多还原