超顺磁微纳米MFH功能材料对铅污染土壤的修复研究
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国家重点研发计划项目(2017YFD0801004、2017YFD0801005)资助


Remediation of Lead-contaminated Soil by Superparamagnetic Micro-nano MFH Functional Materials
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National Key Research and Development Program of China [No. 2017YFD0801004; No. 2017YFD0801005]

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    摘要:

    为有效、快速、廉价地修复废水和土壤铅污染,研究了一种重金属铅修复去除材料(超顺磁微纳米Fe3O4@Ca10(PO46(OH)2功能材料,MFH)的投加量、Pb2+初始浓度、吸附时间、pH、离子强度以及有机质浓度等因素对废水、污染土壤中Pb2+的修复效果。结果表明,MFH对溶液中的Pb2+的吸附满足准二级动力学模型,在10 min左右达到吸附平衡,最大吸附量181.6 mg·g-1;在pH 2.00~5.00范围内Pb2+去除率随溶液pH的增加而下降;溶液中离子强度增大会抑制MFH对Pb2+的去除率,而溶液中有机质含量增加则能有效提高MFH对Pb2+的去除率。MFH对农田和工业园区铅污染土壤均有较好的去除效果,添加重金属活化剂EDTA能明显提高MFH对土壤中铅的去除效果,其中对轻度铅污染的农田土壤中铅总量去除量为102.74 μg·g-1。利用磁棒对土壤中MFH进行回收,回收率可达88%以上,再生性能恢复率89.49%,且再生后的MFH磁性能、比表面积恢复较好。

    Abstract:

    【Objective】This study aimed to effectively, rapidly, and cost-effectively purify wastewater and repair soil from lead pollution.【Method】The remediation effect of a lead-remediation material(superparamagnetic micro nano Fe3O4@ Ca10(PO4)6(OH)2functional material, MFH)on Pb2+ in wastewater and polluted soil was studied in terms of dosage, initial concentration of Pb2+, adsorption time, pH, ionic strength and organic matter concentration.【Result】The results showed that the adsorption of Pb2+ in solution by MFH satisfies the pseudo-second-order kinetic model. The adsorption equilibrium was reached in about 10 min, and the maximum adsorption capacity was 181.6 mg·g-1; at pH 2.00~5.00. Also, the removal rate of Pb2+ in the pH range decreased with the increase of pH while an increase in ionic strength of the solution inhibited the removal rate of Pb2+ by MFH. Nevertheless, an increase in the organic matter content in the reaction system effectively improved the removal rate of Pb2+ by MFH. MFH showed a good lead-removal effect when applied to lead-contaminated soils in farmland and industrial parks. The addition of heavy metal activator EDTA can significantly improve the removal effect of MFH on lead in soil. In slightly lead-contaminated farmland soil, the total amount of lead removed was 102.74 μg·g-1. After experimentation, the recovery rate of MFH from soil was over 88% by using a magnetic rod, while the recovery rate of MFH regeneration performance was 89.49%. Importantly, the magnetic properties and specific surface area of the regenerated MFH recovered well, suggesting that MFH had a good recovery and regeneration ability.【Conclusion】Therefore, MFH is a good material for the decontamination of lead- contaminated wastewater and soils and its usage is promising given that it can easily be recovered with its basic properties intact.

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黎洁,王强,罗萌,江湘婷,孙圆鹏,张立志.超顺磁微纳米MFH功能材料对铅污染土壤的修复研究[J].土壤学报,2023,60(6):1676-1687. DOI:10.11766/trxb202204290220 LI Jie, WANG Qiang, LUO Meng, JIANG Xiangting, SUN Yuanpeng, ZHANG Lizhi. Remediation of Lead-contaminated Soil by Superparamagnetic Micro-nano MFH Functional Materials[J]. Acta Pedologica Sinica,2023,60(6):1676-1687.

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  • 收稿日期:2022-04-29
  • 最后修改日期:2022-06-27
  • 录用日期:2022-11-10
  • 在线发布日期: 2022-11-15
  • 出版日期: 2023-11-28