单伟^1,,
郁红艳^1,,
邹路易¹,
滕跃¹,
严群¹
1.江南大学环境与土木工程学院，无锡 214122
基金项目: 江南大学自主科研计划青年基金资助项目JUSRP11525
国家自然科学基金资助项目21307043
中国博士后基金资助项目2016M59041江南大学自主科研计划青年基金资助项目(JUSRP11525)
国家自然科学基金资助项目(21307043)
中国博士后基金资助项目(2016M59041)

Cd2+ adsorption performance of modified calcium silicate and its potential on Cd contaminated soil remediation

SHAN Wei^1,,
YU Hongyan^1,,
ZOU Luyi¹,
TENG Yue¹,
YAN Qun¹
1.School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China

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摘要:通过吸附-解吸实验和土柱淋溶实验，研究了改性硅酸钙对镉(Cd2+)的吸附性能及对Cd污染土壤的钝化效果。结果表明，改性硅酸钙对Cd2+有较强的吸附能力，其吸附平衡时间在60 min左右，对溶液pH有较宽的适应范围，且当pH呈中性时，对Cd2+的吸附效果最好。由Langmuir模型拟合结果可知，改性硅酸钙对Cd2+的饱和吸附容量可达441.55 mg·g-1。改性硅酸钙对Cd2+有较好的吸附稳定性，适合用于Cd污染土壤的修复。土柱淋溶实验表明，改性硅酸钙对Cd污染土壤的钝化效果明显，不仅降低淋溶液Cd2+含量，使淋溶液Cd2+累积量显著降低47.01%，还使土壤CaCl2-Cd浓度显著降低94.4%，并促使土壤易溶态Cd向难溶态Cd转变。
关键词: 土壤钝化修复/
改性硅酸钙/
镉吸附/
土柱淋溶

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.
Key words:soil passivation remediation/
modified calcium silicate/
Cd adsorption/
soil column leaching.

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刊出日期:2019-04-15

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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

单伟^1,,
郁红艳^1,,
邹路易¹,
滕跃¹,
严群¹
1.江南大学环境与土木工程学院，无锡 214122
基金项目: 江南大学自主科研计划青年基金资助项目JUSRP11525 国家自然科学基金资助项目21307043 中国博士后基金资助项目2016M59041江南大学自主科研计划青年基金资助项目(JUSRP11525) 国家自然科学基金资助项目(21307043) 中国博士后基金资助项目(2016M59041)
关键词: 土壤钝化修复/
改性硅酸钙/
镉吸附/
土柱淋溶
摘要:通过吸附-解吸实验和土柱淋溶实验，研究了改性硅酸钙对镉(Cd2+)的吸附性能及对Cd污染土壤的钝化效果。结果表明，改性硅酸钙对Cd2+有较强的吸附能力，其吸附平衡时间在60 min左右，对溶液pH有较宽的适应范围，且当pH呈中性时，对Cd2+的吸附效果最好。由Langmuir模型拟合结果可知，改性硅酸钙对Cd2+的饱和吸附容量可达441.55 mg·g-1。改性硅酸钙对Cd2+有较好的吸附稳定性，适合用于Cd污染土壤的修复。土柱淋溶实验表明，改性硅酸钙对Cd污染土壤的钝化效果明显，不仅降低淋溶液Cd2+含量，使淋溶液Cd2+累积量显著降低47.01%，还使土壤CaCl2-Cd浓度显著降低94.4%，并促使土壤易溶态Cd向难溶态Cd转变。

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