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腐殖质纳米颗粒对镉污染土壤的修复

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毕冬雪, 邓亚娟, 孟凡德, 韦婧, 王海龙, 袁国栋. 腐殖质纳米颗粒对镉污染土壤的修复[J]. 环境工程学报, 2018, 12(5): 1295-1302. doi: 10.12030/j.cjee.201711218
引用本文: 毕冬雪, 邓亚娟, 孟凡德, 韦婧, 王海龙, 袁国栋. 腐殖质纳米颗粒对镉污染土壤的修复[J]. 环境工程学报, 2018, 12(5): 1295-1302. doi: 10.12030/j.cjee.201711218
shu
BI Dongxue, DENG Yajuan, MENG Fande, WEI Jing, WANG Hailong, YUAN Guodong. Humic nanoparticles for remediation of Cd- contaminated soils[J]. Chinese Journal of Environmental Engineering, 2018, 12(5): 1295-1302. doi: 10.12030/j.cjee.201711218
Citation: BI Dongxue, DENG Yajuan, MENG Fande, WEI Jing, WANG Hailong, YUAN Guodong. Humic nanoparticles for remediation of Cd- contaminated soils[J]. Chinese Journal of Environmental Engineering, 2018, 12(5): 1295-1302. doi: 10.12030/j.cjee.201711218
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腐殖质纳米颗粒对镉污染土壤的修复

  • 1.

    中国科学院烟台海岸带研究所，中国科学院海岸带环境过程与生态修复重点实验室，烟台 264003

  • 2.

    中国科学院大学，北京 100049

  • 3.

    广东大众农业科技有限公司，东莞 523169

  • 基金项目:

    国家重点研发计划（2016YFD0200303）

    国家自然科学基金资助项目（41501522）

    山东省重点研发计划（2016CYJS05A01-1）

    东莞市第一批引进创新科研团队（2014607101003）

Humic nanoparticles for remediation of Cd- contaminated soils

  • 1.

    Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China

  • 3.

    Guangdong Dazhong Agriculture Science Co.Ltd., Dongguan 523169, China

  • Fund Project:

  • 摘要: 外源腐殖质可改变土壤镉（Cd）的含量和状态。以风化煤为原料制备的不溶性胡敏酸为吸附剂，对比研究了其对冶炼厂周边污染土壤及人工模拟污染土壤中Cd的钝化效果。再以泥炭为原料，制备富里酸钾为主的水溶性腐殖酸钾为淋洗剂，用于活化、去除上述2种土壤中的Cd。结果表明，胡敏酸在砂质的人工模拟污染土壤中钝化效果更好，2%的剂量可使土壤中CaCl2提取态Cd的浓度（0.103 mg·L-1）降低19.7%。腐殖酸钾去除土壤Cd的效率随淋洗剂浓度增加而提高，在10 g·L-1的浓度时，单次淋洗可去除高达38.1%的Cd。傅里叶变换红外光谱分析表明，腐殖质与Cd反应后形成了羧酸盐。因此，腐殖质纳米颗粒既可以钝化土壤中的Cd，也可以活化土壤中的Cd，从而达到修复Cd污染土壤的目的。其关键在于根据钝化或活化的目标，选择溶解度适当的腐殖质材料。
    Abstract: Extraneous humic substances could alter the dynamics of Cd in soils. An insoluble humic acid, produced from a leonardite, was used in laboratory experiment as an adsorbent to immobilize Cd in a silt-loam soil near a smelting plant and a Cd-spiked and aged sandy-loam soil, whereas a soluble peat-derived potassium humate was employed as a washing agent to mobilize Cd in, and remove it out of, the contaminated soils. Addition of 2% humic acid could reduce CaCl2 extractable Cd in a soil (0.103 mg·L-1) by 19.7%. This immobilization effect was greater in sandy-loam soil than in silt-loam soil. Similarly, Cd removed from the contaminated soils increased with washing agent dosage. A single washing at 10 g·L-1 of potassium humate removed up to 38.1% of the total Cd in soils. Fourier transform infrared spectroscopic analysis indicated the formation of Cd-carboxyl complex. This study suggests that Cd-contaminated soils can be remediated by humic substances through either an immobilization or mobilization process. The key to the success is to select humic substances with a suitable solubility: water insoluble humic acid for Cd immobilization and water soluble potassium humate for effective removal of Cd out of soils.
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  • 刊出日期:  2018-05-19

腐殖质纳米颗粒对镉污染土壤的修复

  • 1. 中国科学院烟台海岸带研究所，中国科学院海岸带环境过程与生态修复重点实验室，烟台 264003
  • 2. 中国科学院大学，北京 100049
  • 3. 广东大众农业科技有限公司，东莞 523169
基金项目:

国家重点研发计划（2016YFD0200303）

国家自然科学基金资助项目（41501522）

山东省重点研发计划（2016CYJS05A01-1）

东莞市第一批引进创新科研团队（2014607101003）

摘要: 外源腐殖质可改变土壤镉（Cd）的含量和状态。以风化煤为原料制备的不溶性胡敏酸为吸附剂，对比研究了其对冶炼厂周边污染土壤及人工模拟污染土壤中Cd的钝化效果。再以泥炭为原料，制备富里酸钾为主的水溶性腐殖酸钾为淋洗剂，用于活化、去除上述2种土壤中的Cd。结果表明，胡敏酸在砂质的人工模拟污染土壤中钝化效果更好，2%的剂量可使土壤中CaCl2提取态Cd的浓度（0.103 mg·L-1）降低19.7%。腐殖酸钾去除土壤Cd的效率随淋洗剂浓度增加而提高，在10 g·L-1的浓度时，单次淋洗可去除高达38.1%的Cd。傅里叶变换红外光谱分析表明，腐殖质与Cd反应后形成了羧酸盐。因此，腐殖质纳米颗粒既可以钝化土壤中的Cd，也可以活化土壤中的Cd，从而达到修复Cd污染土壤的目的。其关键在于根据钝化或活化的目标，选择溶解度适当的腐殖质材料。

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