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.