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磷营养盐富集容易引起水体富营养化现象，不仅造成景观水体功能性缺失，对人类健康也造成潜在的威胁。由于稀土元素可高效吸附去除水体中磷等无机污染物，本研究拟以Fe3O4/C作为前驱体，采用水热法制备了La(OH)3/Fe3O4/C磁性纳米材料，分析其吸附剂用量、pH、共存离子、吸附动力学、傅里叶红外光谱(FTIR)、X射线光电子能谱(XPS)等，并研究其控制模拟景观水体中磷营养盐含量的能力。结果表明La(OH)3/Fe3O4/C对磷的静态吸附容量高达88.27 mg/g，吸附过程符合准二级动力学模型；溶液p H值在3～7时其具有较好的吸附效果，在共存离子竞争下对磷酸盐表现出良好的选择性。La(OH)3/Fe3O4/C纳米复合材料可作为吸附污染水体中磷酸盐的潜在材料，对景观水体水质控制及富营养化防治具有重要的实用价值和理论意义。
Abstract：The phenomenon of algal bloom caused by the enrichment of phosphorus not only causes the loss of function of landscape water, but also poses a potential threat to human health. Rare earth elements are usually used for adsorptive removal of phosphate pollutants from water. In this study, the magnetic nanomaterials La(OH)3/Fe3O4/C were prepared by hydrothermal method and precipitation method using Fe3O4 as precursor. The adsorbent dosage, pH, coexisting ions, adsorption kinetics, FTIR, XPS, etc. were analyzed to study the capability of La(OH)3/Fe3O4/C to remove and control phosphorus nutrient content in simulated landscape water bodies. The results showed that the static adsorption capacity of La(OH)3/Fe3O4/C for phosphorus was as high as 88.27 mg/g.The adsorption process follows a quasi-second-order kinetic model. La(OH)3/Fe3O4/C showed a good adsorption effect when the pH value was between 3 and 7, and exhibited high selectivity towards phosphates under coexisting ion competition. Thus, La(OH)3/Fe3O4/C nanocomposite can be used as a potential material for adsorbing phosphate in polluted water, and has important practical value and theoretical significance for landscape water quality control and control of eutrophication.
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基本信息:
DOI：10.16026/j.cnki.iea.2024050412
中图分类号:X52;TQ424
引用信息:
[1]张艳,陈丹,祝金波等.磁性载镧纳米复合材料对水体中磷酸盐的吸附性能研究[J].离子交换与吸附,2024,40(05):412-420.DOI:10.16026/j.cnki.iea.2024050412.
基金信息:
国家自然科学基金项目(基金号52160001); 江西省杰出青年基金项目(基金号20224ACB213009)