Abstract
The adsorption performance of manganese oxide in treating arsenic wastewater that contained different As(III)/As(V) molar ratios was investigated, and the samples before and after their reactions were characterized by XRD, TEM, N2 adsorption/desorption, SEM-EDS, FTIR, and XPS. The batch experimental results show that the coexisting molar ratio of As(III) and As(V) has a remarkable effect on arsenic removal by manganese oxide. Upon increasing the As(III)/As(V) molar ratio from 10μM/90μM to 50μM/50μM and 90μM/10μM, respectively, the total arsenic removal by manganese oxide significantly increased from 39.5% to 55.6% and 71.2%, respectively. The origin of the molar ratio effect was studied by combining both the experimental and theoretical results of the Mn2+ release detection, effect of Na2SO3-pretreatment on arsenic removal, and density functional theory (DFT) calculations. The results reveal that the highest arsenic removal by manganese oxide in an arsenic solution with the highest As(III)/As(V) molar ratio is attributed to the Mn2+ release caused by As(III) oxidation, forming more Mn vacancy defects, which makes the adsorption site more active, thus significantly promoting the adsorption performance of manganese oxide in arsenic removal.
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