Enhancing mechanism of arsenic(iii) adsorption by MnO 2 -loaded calcined MgFe layered double hydroxide.

The use of MnO 2 /MgFe-layered double hydroxide (MnO 2 /MgFe-LDH) and MnO 2 /MgFe-layered double oxide (MnO 2 /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 MnO 2 /MgFe-LDH and MnO 2 /MgFe-LDO 400 °C . Based on our developed method, MnO 2 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 MnO 2 /MgFe-LDH and MnO 2 /MgFe-LDO 400 °C exhibited good stability and reusability. In summary, MnO 2 /MgFe-LDH and MnO 2 /MgFe-LDO 400 °C are promising for developing processes for efficient control of the pollutant arsenic.