具有增强可见光驱动催化活性的 Ag-AgVO/AgIO 复合材料。
Ag-AgVO/AgIO composites with enhanced visible-light-driven catalytic activity.
机构信息
Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China.
Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
出版信息
J Colloid Interface Sci. 2018 Aug 15;524:16-24. doi: 10.1016/j.jcis.2018.04.001. Epub 2018 Apr 3.
Ag-AgVO/AgIO composites composed of Ag-AgVO particles (major component) and AgIO nanosheets (minor component) were obtained via photoreduction of AgVO/AgIO composites prepared by sequential precipitation. The optimal Ag-AgVO/AgIO catalysts (in particular, the one with an AgIO/AgVO mass ratio of 6.4%) were found to be more active than AgIO, AgVO, and Ag-AgVO in the photocatalytic degradation of rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and tetracycline hydrochloride (TC) under visible-light irradiation. Ag-AgVO/AgIO can be reused in cycling experiments. Photogenerated holes (h) and superoxide radical anions (O) were demonstrated by radical-capture experiments as the main active species in the photocatalytic degradation of RhB. The more efficient separation and transfer of photogenerated electron-hole pairs are responsible for the enhanced activity of Ag-AgVO/AgIO. A possible photocatalytic mechanism is proposed.
Ag-AgVO/AgIO 复合材料由 Ag-AgVO 颗粒（主要成分）和 AgIO 纳米片（次要成分）组成，通过顺序沉淀制备的 AgVO/AgIO 复合材料的光还原获得。在可见光照射下，最优的 Ag-AgVO/AgIO 催化剂（特别是 AgIO/AgVO 质量比为 6.4%的催化剂）在光催化降解罗丹明 B（RhB）、亚甲基蓝（MB）、甲基橙（MO）和盐酸四环素（TC）方面比 AgIO、AgVO 和 Ag-AgVO 更具活性。Ag-AgVO/AgIO 可在循环实验中重复使用。通过自由基捕获实验证明，光生空穴（h）和超氧自由基阴离子（O）是光催化降解 RhB 的主要活性物质。光生电子-空穴对更有效的分离和转移是 Ag-AgVO/AgIO 增强活性的原因。提出了一种可能的光催化机制。
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