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

• Published in: RSC advances Vol. 12; no. 40; pp. 25833 - 25843
• Main Authors: Xie, Mingqi, Luo, Xiangping, Liu, Chongmin, You, Shaohong, Rad, Saeed, He, Huijun, Huang, Yongxiang, Tu, Zhihong
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 12.09.2022; The Royal Society of Chemistry
• Subjects: adsorbents; Adsorption; Aqueous solutions; Arsenic; Chemical bonds; Chemisorption; Chemistry; Clay; Electron microscopy; Fourier transform infrared spectroscopy; Fourier transforms; Hydroxides; Infrared spectroscopy; Manganese dioxide; Photoelectrons; Pollutants; sorption isotherms; transmission electron microscopy; X ray photoelectron spectroscopy; X-ray diffraction
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d2ra04805a

The use of MnO2/MgFe-layered double hydroxide (MnO2/MgFe-LDH) and MnO2/MgFe-layered double oxide (MnO2/MgFe-LDO400 °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-LDO400 °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-LDO400 °C exhibited good stability and reusability. In summary, MnO2/MgFe-LDH and MnO2/MgFe-LDO400 °C are promising for developing processes for efficient control of the pollutant arsenic.