零价铁对2,4-二氯酚的还原脱氯研究

氯酚是环境中常见的难降解污染物,氯酚中氯原子的脱除可以提高其生化性。在恒温条件下,利用零价铁(Fe0)还原2,4-二氯酚(2,4-DCP)的模拟废水,研究得出在不同条件下溶液的脱氯率,表明在初始溶液pH=4.2时有利于脱氯反应的进行,Fe/C和Fe/Cu体系形成原电池,脱氯能力大大提高,Fe/Cu体系的脱氯率达到了60%,Fe/C体系的脱氯率达到了44%。溶解氧对2,4-DCP的脱氯反应有明显的抑制作用,厌氧条件下过6个小时脱氯率能够达到50%,而在好氧条件下的脱氯率为40%左右。通过XRD检测,分析了使零价铁钝化的原因。

The Research on The Dechlorination of 2,4-dichlorophenol by Zerovalent Iron

Chlrophen is one of the persistent organic pollutants; the wipe-off of chlorine could make it more biodegradated. At ambient temperature and pressure, the 2,4-dichlorophenol was dechlorinated by zerovalent iron（ZVI）, the dechlorination rates of different conditions were detected. The results showed that The results showed that the dechlorination was apt to happen when pH was 4.2. The systems of Fe/C and Fe/Cu could form tittle ceils, which enhanced the dechlorination rate, the dechlorination of Fe/Cu was 60 %, and the Fe/C was 44 %. Dissolved oxgen restricted the dechlorination, the dechlorination rate was 50 % under anaerobic conditions after 6 hours, while it was about 40 % under aerobic conditions. According to XRD, the reasons of ZVI＇s passivation were analyzed.