Calcium-doped magnetic humic acid nano particles for the efficient removal of heavy metals from wastewater: the role of Ca

被引:5
作者
Xue, Shuwen [1 ]
Wang, Yingwei [1 ]
Bo, Wenting [1 ]
Wan, Keji [2 ,3 ]
Miao, Zhenyong [1 ,4 ]
机构
[1] China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou, Peoples R China
[2] China Univ Min & Technol, Natl Engn Res Ctr Coal Preparat & Purificat, Xuzhou, Peoples R China
[3] China Univ Min & Technol, Natl Engn Res Ctr Coal Preparat & Purificat, Xuzhou 221116, Jiangsu, Peoples R China
[4] China Univ Min & Technol, Sch Chem Engn & Tech nol, Xuzhou 221116, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Humic acid; adsorption separation; structure-activity relationship; calcium-doped; heavy metal; ADSORPTION BEHAVIOR; FE3O4; NANOPARTICLES; AQUEOUS-SOLUTION; PB(II); MECHANISMS; SORPTION;
D O I
10.1080/09593330.2023.2213832
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Ca doping is an effective method for improving the adsorption capacity of HA-Fe aggregates and regulating their structures. Understanding the structural characteristics of Ca-HA-Fe aggregates can help explore their microscopic adsorption effect on heavy metals. However, the heterogeneity of HA results in an incomplete understanding of the structural characteristics of the ternary system of Ca-HA-Fe aggregates and adsorption of the quaternary system of Ca-HA-Fe-Pb/Cu/Cd. In this study, interactions between Ca-HA-Fe ternary and Ca-HA-Fe-Pb/Cu/Cd quaternary systems were discussed from a molecular perspective. The structures of the basic structural units of HA were identified. Density functional theory (DFT) was employed to calculate the stable states of basic structural units of HA and Ca2+. The results showed that hydroxyl and carboxyl groups exhibited the highest capacity to bind with Ca2+. The interactions among Ca, HA, and Fe led to the formation of network aggregates. The binding energies of functional groups for heavy metals and the feasibility of ion exchange were calculated by the method of experiment and DFT. According to the contribution of functional group complexation and ion exchange, the ion exchange values for Pb2+, Cu2+, and Cd2+ were 66.71%, 62.87%, and 60.79%, respectively, which indicated that Ca2+ ion exchange showed considerable potential in enhancing the adsorption capacity of heavy metals.
引用
收藏
页码:3228 / 3243
页数:16
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