环境工程学报2019，Vol.13Issue(4)：918-926,9.DOI:10.12030/j.cjee.201810085
改性硅酸钙对Cd2+的吸附性能及其对Cd污染土壤的修复潜力
Cd2+ adsorption performance of modified calcium silicate and its potential on Cd contaminated soil remediation
摘要
Abstract
The Cd2+ adsorption performance of modified calcium silicate and its passivation effect on Cd contaminated soil were studied by adsorption-desorption experiment and soil column leaching experiment. The results showed that the modified calcium silicate had a strong performance on Cd2+adsorption, and its adsorption equilibrium time was about 60 min. It had a wide adaptability to the solution pH, and the maximum Cd2+adsorption capacity occurred at neutral pH. The saturated adsorption capacity of modified calcium silicate to Cd2+could reach 441.55 mg·g-1 based on the fitting results with Langmuir model. In addition, the modified calcium silicate presented a good adsorption stability to Cd2+, and was suitable for Cd contaminated soil remediation. Soil column leaching experiments showed that the modified calcium silicate had a significant effect on Cd contaminated soil passivation, which not only reduced the Cd2+concentration of the leaching solution, but also significantly reduced the Cd2+accumulation in the leaching solution by 47.01％, and the CaCl2-Cd concentration in soil by 94.4％, and promoted the transformation of soluble Cd species to insoluble Cd species in soil. It was shown that modified calcium silicate can be used for Cd contaminated soil remediation.关键词
土壤钝化修复/改性硅酸钙/镉吸附/土柱淋溶Key words
soil passivation remediation/modified calcium silicate/Cd adsorption/soil column leaching分类
资源环境引用本文复制引用
单伟,郁红艳,邹路易,滕跃,严群..改性硅酸钙对Cd2+的吸附性能及其对Cd污染土壤的修复潜力[J].环境工程学报,2019,13(4):918-926,9.基金项目
江南大学自主科研计划青年基金资助项目(JUSRP11525) （JUSRP11525）
国家自然科学基金资助项目(21307043) （21307043）
中国博士后基金资助项目(2016M59041) （2016M59041）
