有机物质对铁还原降解四氯化碳的影响

为探寻土壤和地下水中广泛存在的醌和表面活性剂等有机物质对铁用于环境中有机氯污染修复的影响,实验采用在零价铁还原体系中,加入增强电子转移的醌类物质和铁表面负载表面活性剂,以提高铁对四氯化碳的吸附来增强铁还原脱氯.结果表明：分别加入4.0×10^-3mol/L蒽醌-2,6-二磺酸钠和1,4-二羟基蒽醌,四氯化碳的降解速度提高70%和52%.用阳离子表面活性剂负载的零价铁对四氯化碳降解有很好的增强效果,最佳的增强效果在临界胶束浓度附近,十六烷基三甲基溴化铵和溴代十六烷基吡啶处理的铁比未处理的铁可提高四氯化碳的降解速率分别为81%和130%,2种阴离子表面活性剂没有协同增强效果.

Effect of reduction degradation by organic matter

In order to study the influence of some organic matter such as quinones and surfactant in soil and ground water on the remediation of the chlorinated compounds pollution in environment by zero valent iron (ZVI), the iron reduction degradation was enhanced by adding organic matter and surfactant loaded on the iron surface to the ZVI reduction system. The former can enhance the electron transfer and the latter can improve the adsorption of iron to the carbon tetrachloride. The results showed that the degradation rate of carbon tetrachloride increased 70% and 52% respectively by the adding of 4.0×10^-3 mol/L anthraquinone-2,6-disulfonate and 1,4-dihydroxyanthraquinone. ZVI loaded by the cation surfactant had good synergistic effect on the degradation of carbon tetrachloride, and the best synergistic effect was achieved at the critical micelle concentration. The degradation rate of carbon tetrachloride was enhanced by 81% and 130% respectively with the iron treated by cetyl trimethyl ammonium bromide and cetyl pyridinium bromide. The iron modified by the anionic surfactant hardly had any obvious effect on the degradation.