砷
纳米片
扩展X射线吸收精细结构
水溶液
氧烷
吸附
氧化还原
X射线光电子能谱
X射线吸收光谱法
吸收(声学)
纳米复合材料
双水相体系
化学
相(物质)
无机化学
化学工程
材料科学
核化学
吸收光谱法
纳米技术
冶金
光谱学
有机化学
复合材料
量子力学
工程类
物理
作者
Zhipan Wen,Yalei Zhang,Yu Wang,Lina Li,Gang Cheng
标识
DOI:10.1016/j.cej.2016.11.112
摘要
Inorganic arsenic cycling in the natural environment is significantly controlled by manganese/iron oxides, and studying the redox transformation of arsenic in both aqueous and solid phase is therefore essential to understand its environmental toxicity and predict its environmental behavior. Herein, the synthesized magnetic thin-film MnO2 nanosheet-coated flowerlike Fe3O4 nanocomposites have been used to simultaneously investigate the potential redox transformation of arsenic in aqueous phase and arsenic speciation on the solid phase interface. The results showed the initial Mn/Fe ratio has serious influenced the morphologies, textural properties and uptake of arsenic in aqueous solution. The maximum adsorption capacities of As(III) and As(V) by MF2 were 76.73 mg/g and 120.50 mg/g, respectively. After 10 h reaction, the total arsenic concentration in both As(III)-MF2 system and As(V)-MF2 system far below than that of 10 μg/L, which was setted the maximum guideline concentration value in drinking water by World Health Organization (WHO). HPLC-ICP-MS revealed that in aqueous solution part of As(III) was oxidized into As(V), while As(V) was not reduced into As(III). X-ray absorption near edge structure (XANES) and XPS analysis from solid phase further confirmed that the MnO2 nanosheet mainly acted as an oxidant, while flowerlike Fe3O4 only played the role as an arsenic species adsorbent. Extended X-ray absorption fine structure (EXAFS) analysis indicated that both As(III) and As(V) formed inner-sphere bidentate binuclear corner-sharing (2C) complexes with an As-Fe interatomic distance of 3.32–3.34 Å on the interface of As-MF2 solid phase.
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