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Stability study of the As(V)-Fe(III) oxyhydroxide coprecipitate over a broad pH range: Characteristics and mechanism
Xiuying Zhang1, Xin Shi2, Ming Deng2
1School of Chemistry Science and Engineering, Yunnan University, Kunming 650091, Yunnan Province, PR China; Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, Yunnan Province, PR China.
Abstract:
Fe(III)-oxyhydroxide composites are efficient adsorption materials, however, their detailed geometrical structures and adsorption mechanisms in a broad pH range are still unclear. In this study, the structures of arsenic(V) adsorbed on Fe(III)-oxyhydroxide adsorption complexes were investigated using hybrid density functional theory calculations together with experimental Fourier transform infrared (FT-IR) spectroscopy. Adsorption experiments showed higher arsenic(V) removal rates in the range of pH 5.0-10.0. FT-IR and X-ray diffraction (XRD) revealed that arsenic(V) is stably adsorbed by Fe(III)-oxyhydroxide complexes. The formation of monomeric As(V) appears to be favored in the 1.0-4.0 pH range, while dimeric and trimeric As(V)-Fe(III) oxyhydroxide complexes are preferably formed at higher pH (4.0-10.0). Namely, dimeric and trimeric Fe(III)-oxyhydroxides exhibited good removal efficiencies for arsenic(V) over a wide pH range. Interestingly, the stabilities of the complexes formed between As(V) and monomeric, dimeric and trimeric Fe(III)-oxyhydroxides follow the orders: As(V) trimer > As(V) dimer > As(V) monomer; these complexes are also interconvertible.
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