School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; State Key Laboratory of Urban Water Resources & Environment, Harbin Institute of Technology, Harbin 150001, PR China.
Chemosphere. 2018 Dec;212:114-123. doi: 10.1016/j.chemosphere.2018.08.070. Epub 2018 Aug 16.
Visible light-driven conversion of soluble U(VI) to slightly soluble U(IV) has been regarded as a efficient and environmentally friendly technology to deal with uranium containing wastewater. In this paper, we attempted to use photocatalytic technology to reduction U(VI) from aqueous solution by constructing a highly efficient photocatalysts. The novel Sn-doped InS microspheres photocatalyst were synthesized for the first time by a simple hydrothermal method, and characterized with various analytical and spectroscopic techniques to determine their structural, morphological, compositional, optical and photocatalytic properties. In determination of photocatalytic activity, the results showed that all Sn-doped InS samples exhibited greater photocatalytic performance in reduction of U(VI) under visible light than the pure InS. The optimum SnInS photocatalyst with Sn:In molar ratio of 1:4.8 (SnInS) had the highest photocatalytic performance (95% reduction efficiency within 40 min irradiation time), which was approximately 15.60 times faster than that of pure InS. The enhanced photocatalytic activity of the optimum SnInS was largely ascribed to the higher specific surface area, red-shift in the absorption band, the efficient separation of photogenerated electron-hole pairs (e/h) and the narrowed band gap with an up shifting of valence band, conduction band potentials. In addition the optimum SnInS photocatalyst exhibited a good recyclability and stability during the repetitive experiments. Finally, the possible active species and the possible mechanism on basis of the experimental results were discussed in detail.
可见光驱动的可溶性 U(VI)转化为略溶性 U(IV)被认为是一种处理含铀废水的高效、环保技术。本文首次采用简单的水热法合成了新型 Sn 掺杂 InS 微球光催化剂，并通过各种分析和光谱技术对其结构、形态、组成、光学和光催化性能进行了表征。在光催化活性测定中，结果表明，所有 Sn 掺杂 InS 样品在可见光下降解 U(VI)的光催化性能均优于纯 InS。具有最佳 Sn:In 摩尔比 1:4.8 的 SnInS 光催化剂（40 min 内的光催化还原效率达到 95%）具有最高的光催化性能，其光催化还原效率约为纯 InS 的 15.60 倍。最佳 SnInS 的增强光催化活性主要归因于更高的比表面积、吸收带的红移、光生电子-空穴对(e/h)的有效分离以及价带、导带势的上移导致的能带隙变窄。此外，最佳 SnInS 光催化剂在重复实验中表现出良好的可回收性和稳定性。最后，根据实验结果详细讨论了可能的活性物质和可能的反应机制。
