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Polyvinylpyrrolidone functionalized magnetic graphene-based composites for highly efficient removal of lead from wastewater

文献类型： 外文期刊

作者： Yang, Bin 1 ; Wei, Yihua 2 ; Liu, Qinglan 2 ; Luo, Yang 1 ; Qiu, Suyan 2 ; Shi, Zeming 1 ;

作者机构： 1.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Sichuan, Peoples R China

2.Jiangxi Acad Agr Sci, Inst Qual & Safety & Stand Agr Prod Res, Nanchang 330200, Jiangxi, Peoples R China

关键词： Magnetic graphene-based composites; Polyvinylpyrrolidone; Graphene oxide; Pb(II) removal; Fe3O(4)

期刊名称：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS （ 影响因子：4.539； 五年影响因子：4.039 ）

ISSN： 0927-7757

年卷期： 2019 年 582 卷

页码：

收录情况： SCI

摘要： Lead (Pb) is one of the significant pollutants in environment. A maximum value of 0.01 mg/L in drinking water has been set by many countries. Thus, it is indispensible for the selective removal of Pb below 0.01 mg/L (10 ppb) in the wastewater treatment. In the study, a reusable magnetic graphene-based composites functionalized with polyvinylpyrrolidone (PVP/Fe3O4/GO composites) are reported to remove Pb(II) ions from water with highly selective and efficient. The water dispersity and pH tolerance are significantly improved by the PVP decoration. Comparison of PVP/Fe3O4/GO composites with Fe3O4/GO and PVP/GO composites reveals that PVP/Fe3O4/GO composites have higher adsorption capacity with 793.65 mg/g and higher separation factor (a''). Such composites can remove 99.74% of Pb(II) from coexisting metal ions including Na(I), K(I), Mg(II), Mn (II), Cu(II), Zn(II), Cr(III) and Cd(II) with a high separation factor of the order 10 to 10 g . The mechanism of Pb(II) removal is mainly dependent on the electrostatic interaction between Pb(II) and -COOH of Fe3O4/GO as well as the chemical absorption between Pb(II) and the PVP group. Additionally, PVP/Fe3O4/GO composites have been applied to treat different wastewater samples with over 90% of removal efficiency. Especially in river water sample, Pb(II) ions can be declined to similar to 0.4 ppb after treating, demonstrating its great potential in wastewater treatment.

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