Simultaneous removal of arsenic and cadmium in aqueous solution by a novel hydrotalcite-like absorbent FeMnCa-LDHs

文献类型： 外文期刊

第一作者： Xiao, Wei

作者： Xiao, Wei;Deng, Ling;Yu, Jie;Wei, Shiqiang;Jiang, Zhenmao;Liao, Yumei;Zhang, Qingrui

作者机构：

关键词： Adsorbent; Layered double hydroxides; Arsenic; Cadmium; Wastewater treatment; Adsorption mechanism

期刊名称：INORGANIC CHEMISTRY COMMUNICATIONS （ 影响因子：4.4； 五年影响因子：3.6 ）

ISSN： 1387-7003

年卷期： 2024 年 163 卷

页码：

收录情况： SCI

摘要： As(III) and Cd(II) pose a significant threat to the ecological environment and human health due to their high toxicity and carcinogenicity, the simultaneous removal of hazardous anions and cations in wastewater has always been a challenging problem. This study employed the co -precipitation method to synthesize FeMnCa-LDHs, a novel ternary metal material devoid of toxic metals, enabling simultaneous removal of As(III) and Cd(II) from aqueous solutions. The XRD patterns and SEM-EDS images showed that the prepared FeMnCa-LDHs exhibited characteristic peaks and a typical layered structure of hydrotalcite-like compounds with high crystallinity. In the composite adsorption system, FeMnCa-LDHs showed synergistic sorption of As(III) and Cd(II) in water, and their adsorption kinetics conformed to the quasi -secondary kinetic model, with adsorption rates of 0.31 and 0.136 g & sdot; (mg & sdot; h) - 1 , respectively, and the isothermal adsorption curves conformed to the Langmuir model, with the maximum adsorption amounts of 216.08 and 193.18 mg & sdot; g - 1 (pH = 5.0, 25 degrees C), respectively, higher than those of the other LDHs. In the pH range of 3 - 6, FeMnCa-LDHs exhibited excellent adsorption performance on As(III) and Cd(II), and the adsorption capacity can reach 89.0 and 82.9 mg & sdot; g - 1 , respectively. The coexistence of both PO 4 3- and CO 3 2 - ions in water had a competitive effect on the adsorption of As(III) but had little effect on Cd(II) adsorption. The main adsorption mechanism between Cd(II) and FeMnCa-LDHs was found to be isomorphic substitution and surface precipitation, as revealed by XRD, XPS, and FT-IR analyses. On the other hand, the adsorption mechanism that bonded As(III) involved oxidation, ion exchange, surface complexation, and surface precipitation. Furthermore, it maintains a specific adsorption capacity even after undergoing five adsorption cycles. This study demonstrates the potential of FeMnCa-LDHs in treating wastewater that contains As(III) and Cd (II).

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