国家重点研发计划项目(No. 2017YFD0801004; 2017YFD0801005)
1.School of resources and environment, Southwest University;2.Chongqing Changshou economic and Technological Development Zone Development and Investment Group Co., Ltd., Chongqing,;3.Housing and Urban Rural Development Bureau of Fucheng District, Mianyang City, Sichuan Province
National Key Research and Development Program of China [No. 2017YFD0801004; No. 2017YFD0801005]
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(PO4)6(OH)2功能材料，MFH)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为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。
【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)2 functional 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.
li jie, wang qiang, luo meng, jiang xiang ting, sun yuan peng, zhang li zhi. Remediation of Lead-contaminated Soil by Superparamagnetic Micro-nano MFH Functional Materials[J]. Acta Pedologica Sinica, DOI:10.11766/trxb202204290220,[In Press]