期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
卷 18, 期 23, 页码 -出版社
MDPI
DOI: 10.3390/ijerph182312578
关键词
granular sponge iron; carbon tetrachloride; reductive dechlorination; chloroform
资金
- National Key Research and Development Project of China [2020YFC1806502]
The study demonstrated that ZVI effectively degrades CCl4, with approximately 75% transformed into chloroform through hydrogenolysis. The rate of chloroform transformation was slower compared to CCl4, leading to chloroform accumulation. CCl4 degradation is a pseudo first-order process and the ZVI dosage significantly affects the degradation efficiency.
Granular sponge zero valent iron (ZVI) was employed to degrade carbon tetrachloride (CCl4). The effects of acidic washing, initial solution pH, and ZVI dosage on CCl4 degradation were investigated. Results showed that CCl4 was effectively removed by ZVI and approximately 75% of CCl4 was transformed into chloroform through hydrogenolysis. The rate of chloroform transformation was slower compared to that of CCl4, resulting in chloroform accumulation. CCl4 degradation was a pseudo first-order process. The observed pseudo first-order reaction rate constant (k(obs)) for CCl4 and chloroform were 0.1139 and 0.0109 h(-1), respectively, with a ZVI dosage of 20 g/L and an initial CCl4 concentration of 20 mg/L. Surface acidic washing had a negligible effect on CCl4 degradation with ZVI. The k(obs) for CCl4 degradation increased linearly with increasing ZVI dosage and the optimal dosage of ZVI was 20 g/L based on the surface area-normalized rate constants. The negative relationship between k(obs) and the solution pH indicated that the degradation of CCl4 by ZVI performed better under weakly acidic conditions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据