铁酸盐
矛盾
环境化学
环境科学
化学
矿物学
吸附
有机化学
哲学
认识论
作者
Yuhong Huang,Xiaopeng Zhao,Xinhao Wang,Bin Gao,Keishi Oyama,Chiharu Tokoro,Dongmei Zhou,Xueyuan Gu
标识
DOI:10.1021/acs.est.4c05795
摘要
Ferrihydrite is omnipresent in nature, and its adsorption of As(III/V) decides the migration of arsenic. Although As(III) is commonly recognized as the more mobile species of inorganic arsenic, it sometimes exhibits less mobility in ferrihydrite systems, which calls for further insights. In this study, we elucidated the adsorption behavior and mechanisms of As(III/V) on ferrihydrite under different loading levels (molar ratio As/Fe = 0-0.38), solution pH (3-10), and coexisting ions [P(V) and Ca(II)] based on batch adsorption experiments, surface complexation modeling, density functional theory calculations, and X-ray photoelectron spectroscopy. Our results show that As(III) exhibits weaker adsorption affinity but a larger capacity compared with that of As(V). On ferrihydrite, As(III) and As(V) are adsorbed mainly as bidentate mononuclear complexes at type-a sites [≡Fe(OH
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