Acetate anions intercalated Fe/Mg-layered double hydroxides modified biochar for efficient adsorption of anionic and cationic heavy metal ions from polluted water

被引：12

作者：

Li Y. ^{[1
]}

Wang S. ^{[1
]}

Ouyang X.F. ^{[1
]}

Dang Z. ^{[1
,2
,3
]}

Yin H. ^{[1
,2
,3
]}

机构：

[1] School of Environment and Energy, South China University of Technology, Guangzhou

[2] Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangzhou

[3] Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou

来源：

Chemosphere | 2024年 / 362卷

关键词：

Acetate anions; Adsorption; Heavy metals; Interlayer spacing regulation; Layered double hydroxides;

D O I：

10.1016/j.chemosphere.2024.142652

中图分类号：

学科分类号：

摘要：

The simultaneous removal of anionic and cationic heavy metals presents a challenge for adsorbents. In this study, acetate (Ac-) was utilized as the intercalating anion for layered double hydroxide (LDH) to prepare a novel biochar composite adsorbent (Ac-LB) designed for the adsorption of Pb(II), Cu(II), and As(V). By utilizing Ac- as the intercalating anion, the interlayer space of the LDH was enlarged from 0.803 nm to 0.869 nm, exposing more adsorption sites for the LDH and enhancing the affinity for heavy metals. The results of the adsorption experiments showed that the adsorption effect of Ac-LB on heavy metals was significantly improved compared to the original FeMg-LDH modified biochar composites (LB), and the maximum adsorption capacity of Pb(II), Cu(II), and As(V) were 402.70, 68.50, and 21.68 mg/g, respectively. Wastewater simulation tests further confirmed the promising application of Ac-LB for heavy metal adsorption. The analysis of the adsorption mechanism revealed that surface complexation, electrostatic adsorption, and chemical deposition were the main mechanisms of action between heavy metals (Pb(II) and Cu(II)) and Ac-LB. Additionally, Cu(II) ions underwent a homogeneous substitution reaction with Ac-LB. The adsorption process of As(V) by Ac-LB mainly relied on complexation and ion-exchange reactions. Lastly, the modification of the LDH structure by Ac− as an intercalating anion, thereby increasing the affinity for heavy metals, was further illustrated using density-functional theory (DFT) calculations. © 2024

引用

共 49 条

[1] Adegoke K.A., Akinnawo S.O., Ajala O.A., Adebusuyi T.A., Maxakato N.W., Bello O.S., Progress and challenges in batch and optimization studies on the adsorptive removal of heavy metals using modified biomass-based adsorbents, Bioresour. Technol. Rep., 19, (2022)
[2] Babu Poudel M., Shin M., Joo Kim H., Interface engineering of MIL-88 derived MnFe-LDH and MnFe2O3 on three-dimensional carbon nanofibers for the efficient adsorption of Cr(VI), Pb(II), and As(III) ions, Sep. Purif. Technol., 287, (2022)
[3] Cao Y., Guo Q., Liang M., Sun W., Sb(III) and Sb(V) removal from water by a hydroxyl-intercalated, mechanochemically synthesized Mg-Fe-LDH, Appl. Clay Sci., 196, (2020)
[4] Chai F., Zhang R., Min X., Yang Z., Chai L., Zhao F., Highly efficient removal of arsenic (III/V) from groundwater using nZVI functionalized cellulose nanocrystals fabricated via a bioinspired strategy, Sci. Total Environ., 842, (2022)
[5] Cheng Y., Wang B., Yan P., Shen J., Kang J., Zhao S., Zhu X., Shen L., Wang S., Shen Y., Chen Z., In-situ formation of surface reactive oxygen species on defective sites over N-doped biochar in catalytic ozonation, Chem. Eng. J., 454, (2023)
[6] Cui Z., Xu G., Ormeci B., Hao J., A novel magnetic sludge biochar was prepared by making full use of internal iron in sludge combining KMnO4–NaOH modification to enhance the adsorption of Pb (Ⅱ), Cu (Ⅱ) and Cd (Ⅱ), Environ. Res., 236, (2023)
[7] El Hanandeh A., Mahdi Z., Imtiaz M.S., Modelling of the adsorption of Pb, Cu and Ni ions from single and multi-component aqueous solutions by date seed derived biochar: comparison of six machine learning approaches, Environ. Res., 192, (2021)
[8] Guan X., Yuan X., Zhao Y., Bai J., Li Y., Cao Y., Chen Y., Xiong T., Adsorption behaviors and mechanisms of Fe/Mg layered double hydroxide loaded on bentonite on Cd (II) and Pb (II) removal, J. Colloid Interface Sci., 612, pp. 572-583, (2022)
[9] He F., Yang Z., Zhao F., Repo E., Yang W., Liao Q., Si M., Zou B., Lin Z., Unveiling the dual roles of the intercalation of [MoS4]2− clusters in boosting heavy metal capture by Ca–Al layered double hydroxide, Environ. Sci.: Nano, 10, pp. 190-202, (2023)
[10] Hou T., Yan L., Li J., Yang Y., Shan L., Meng X., Li X., Zhao Y., Adsorption performance and mechanistic study of heavy metals by facile synthesized magnetic layered double oxide/carbon composite from spent adsorbent, Chem. Eng. J., 384, (2020)

← 1 2 3 4 5 →