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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

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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. doi: 10.12030/j.cjee.201810085
引用本文: 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. doi: 10.12030/j.cjee.201810085
shu
SHAN Wei, YU Hongyan, ZOU Luyi, TENG Yue, YAN Qun. Cd2+ adsorption performance of modified calcium silicate and its potential on Cd contaminated soil remediation[J]. Chinese Journal of Environmental Engineering, 2019, 13(4): 918-926. doi: 10.12030/j.cjee.201810085
Citation: SHAN Wei, YU Hongyan, ZOU Luyi, TENG Yue, YAN Qun. Cd2+ adsorption performance of modified calcium silicate and its potential on Cd contaminated soil remediation[J]. Chinese Journal of Environmental Engineering, 2019, 13(4): 918-926. doi: 10.12030/j.cjee.201810085
shu

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

  • 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

  • 1.

    School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China

  • Fund Project:

  • 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。
    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.
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  • 刊出日期:  2019-04-15

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

  • 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)

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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