Enhancing mechanism of arsenic(iii) adsorption by MnO2-loaded calcined MgFe layered double hydroxide

Mingqi Xie; Xiangping Luo; Chongmin Liu; Shaohong You; Saeed Rad; Huijun He; Yongxiang Huang; Zhihong Tu

doi:10.1039/d2ra04805a

Enhancing mechanism of arsenic(iii) adsorption by MnO₂-loaded calcined MgFe layered double hydroxide

RSC Adv. 2022 Sep 12;12(40):25833-25843. doi: 10.1039/d2ra04805a.

Authors

Mingqi Xie^{1

2}, Xiangping Luo^{1

2}, Chongmin Liu^{1

2}, Shaohong You^{1

2}, Saeed Rad^{1

2}, Huijun He^{1

2}, Yongxiang Huang^{1

2}, Zhihong Tu^{1

2

3}

Affiliations

¹ College of Environmental Science and Engineering, Guilin University of Technology Guilin 541004 China chongmin@glut.edu.cn.
² Guangxi Key Laboratory of Theory & Technology for Environmental Pollution Control, Guilin University of Technology Guilin 541004 China.
³ CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences Guangzhou 510640 China.

Abstract

The use of MnO₂/MgFe-layered double hydroxide (MnO₂/MgFe-LDH) and MnO₂/MgFe-layered double oxide (MnO₂/MgFe-LDO_{400 °C}) for arsenic immobilization from the aqueous medium is the subject of this research. Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy were used to characterise MnO₂/MgFe-LDH and MnO₂/MgFe-LDO_{400 °C}. Based on our developed method, MnO₂ was spread on the clay composites' surfaces in the form of a chemical bond. The clay composite exhibited a good adsorption effect on arsenic. The experimental findings fit the pseudo-second-order model well, indicating that the chemisorption mechanism played a significant role in the adsorption process. Furthermore, the Freundlich model suited the adsorption isotherm data of all adsorbents well. The recycling experiment showed that MnO₂/MgFe-LDH and MnO₂/MgFe-LDO_{400 °C} exhibited good stability and reusability. In summary, MnO₂/MgFe-LDH and MnO₂/MgFe-LDO_{400 °C} are promising for developing processes for efficient control of the pollutant arsenic.