| 王彦卫,朱正如,姜俊超.Ag纳米晶对La2O3/g-C3N4催化剂光催化性能影响[J].,2020,60(3):228-236 |
| Ag纳米晶对La2O3/g-C3N4催化剂光催化性能影响 |
| Influence of Ag nanocrystals on photocatalytic performance in photocatalyst of La2O3/g-C3N4 |
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| DOI：10.7511/dllgxb202003002 |
| 中文关键词: 光催化 Ag纳米晶 La2O3/g-C3N4 盐酸四环素 |
| 英文关键词: photocatalytic Ag nanocrystals La2O3/g-C3N4 tetracycline hydrochloride |
| 基金项目:国家自然科学基金资助项目(41701208)；辽宁省教育厅资助项目(LF2019003). |
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| 中文摘要: |
| 使用简单光还原方法将Ag纳米晶与La2O3/g-C3N4光催化剂复合．使用XRD、FESEM、TEM、FTIR、XPS、PL和DRS等技术表征光催化剂的表面特性和光电化学性质．通过Ag-La2O3/g-C3N4在氙灯照射下降解盐酸四环素的实验，考察了Ag纳米晶的引入对催化剂光催化性能的影响．研究表明，Ag-La2O3/g-C3N4复合光催化剂对盐酸四环素的光催化降解率达到92.32%．这一反应过程可分为高浓度和低浓度阶段，分别遵循零级和一级动力学模型．通过进一步推测，指出空穴、电子衍生的超氧自由基和羟基自由基是降解盐酸四环素的重要活性物质．Ag纳米晶的表面等离子共振(SPR)效应和电子聚集能力促进活性物质生成． |
| 英文摘要: |
| Ag nanocrystals are synthesized with La2O3/g-C3N4 photocatalyst by simple photo-reduction method. XRD, FESEM, TEM, FTIR, XPS, PL and DRS technologies are applied to characterize the surface features and photoelectric chemical properties of photocatalysts. The influence of Ag nanocrystals on photocatalytic activity of the catalyst is verified by a series of tetracycline hydrochloride (TTCH) degradation experiments in xenon lamp. The result shows that the photocatalytic degradation rate of TTCH is 92.32% by Ag-La2O3/g-C3N4 composite photocatalyst. The reaction process can be divided into high and low concentration stages, following the zero-order kinetics and the first-order kinetic model, respectively. Through further speculation, it is concluded that holes, superoxide radicals and hydroxyl radicals from electrons are important active species for degradation of TTCH. The surface plasmon resonance (SPR) effect and electron aggregation ability of Ag nanocrystals promote the formation of active species. |
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