吸附
废水
水溶液中的金属离子
光催化
朗缪尔吸附模型
罗丹明B
材料科学
电镀
铜
化学工程
金属
金属有机骨架
化学
催化作用
纳米技术
环境工程
冶金
图层(电子)
有机化学
环境科学
工程类
作者
Qiangting Zheng,Qinyi Li,Ying Tao,Jue Gong,Jiangli Shi,Yan Yu,Xiaoyu Guo,Haifeng Yang
出处
期刊:Chemosphere
[Elsevier]
日期:2023-11-01
卷期号:340: 139885-139885
被引量:2
标识
DOI:10.1016/j.chemosphere.2023.139885
摘要
Direct discharge of electroplating wastewater containing hazardous metal ions such as Cu2+ and Ag + results in environmental pollution. In this study, we rationally prepare a magnetic composite hydrogel consisted of Fe3O4, UiO-66-NH2, chitosan (CTS) and polyethyleneimine (PEI), namely Fe3O4@UiO-66-NH2/CTS-PEI. Thanks to the strong attraction between the amino group and metal cations, the Fe3O4@UiO-66-NH2/CTS-PEI hydrogel shows the maximum adsorption capacities of 321.67 mg g-1 for Cu2+ ions and 226.88 mg g-1 for Ag + ions within 120 min. As real scenario, the Fe3O4@UiO-66-NH2/CTS-PEI hydrogel exhibits excellent removal efficiencies for metallic ions even in the complicated media of actual electroplating wastewater. In addition, we explore the competitive adsorption order of metal cations by using experimental characterization and theoretical calculations. The optimal configuration of CTS-PEI is also discovered with the density functional theory, and the water retention within hydrogel is simulated through molecular dynamics modeling. We find that the Fe3O4@UiO-66-NH2/CTS-PEI hydrogel could be reused and after 5 cycles of adsorption-desorption, removal efficiency could maintain 80%. Finally, the Ag+ accumulated by hydrogel are reduced to generate a photocatalyst for efficient degradation of Rhodamine B. The novel magnetic hydrogel paves a promising path for efficient removal of heavy metal ions in wastewater and further resource utilization as photocatalysts.
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