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首页> 外文期刊>Catalysis science & technology >Enhanced visible photocatalytic activity of titania-silica photocatalysts: effect of carbon and silver doping
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Enhanced visible photocatalytic activity of titania-silica photocatalysts: effect of carbon and silver doping

机译：增强的可见光催化活性的光催化剂：碳和银掺杂的影响

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摘要

To utilize efficiently visible light in photocatalytic reactions, a series of doped TiO2 photocatalysts were synthesized via a facile solvothermal method. The photocatalysts were characterized with various techniques. The results indicated that all the photocatalysts were of an anatase phase, the Ag_(0.010)C_(2.0)-TS_(0.20) sample possessed the largest surface area (306.0 m~2 g~(-1)) and pore volume (2.05 cm3 g~(-1)). The carbon dopant existed in the surface layer of the TiO2-SiO2 composite and narrowed the energy band gap, which induced visible light absorption. Silver existed on the particle surface and in two forms, Ag~+ and Ag~0, which acted together to inhibit the recombination of photogenerated electrons and holes. The photoactivities were evaluated by decomposition of RhB under visible irradiation. It was found that the Ag-C/TS photocatalyst exhibited the highest visible photoactivity, with the molar ratios of Ag-Ti, and C-Ti of 0.005, and 2.0, respectively, corresponding to the reaction rate constant 2.09 h~(-1). The reaction rate was 52.3, 11.2 and 2.33 times higher than that of TiO2 (0.04 h~(-1)), Ag_(0.005)-TiO2 (0.186 h~(-1)) and C_(2.0)-TiO2 (0.897 h~(-1)), respectively. The enhanced visible photocatalytic activity can be attributed to the synergetic effects of silver and carbon doping, as well as silicon introduction. The photocatalytic reaction mechanism was verified with ESR technique; furthermore, both the hydroxyl radical and superoxide radical played a critical role on the photocatalytic reaction, in addition, DMPO-·H was found in the ESR experiments.
机译：为了利用光催化反应中有效可见的光，通过简单的溶剂热法合成了一系列掺杂的TiO2光催化剂。用各种技术表征光催化剂。结果表明，所有光催化剂均为剖析阶段，Ag_（0.010）C_（2.0）-TS_（0.20）样品具有最大的表面积（306.0 m〜2 g〜（-1））和孔体积（2.055 cm3 g〜（-1））。碳掺杂剂存在于TiO2-SIO2复合材料的表面层中，并缩小了能带隙，从而诱导可见光吸收。银存在于粒子表面和两种形式的Ag〜+和Ag〜0，它们一起作用以抑制光生电子和孔的重组。通过在可见辐射下RHB分解来评估光活性。发现AG-C/TS光催化剂表现出最高的可见光活性，Ag-Ti的摩尔比分别为0.005和2.0，对应于反应速率常数2.09 H〜（-1） ）。反应速率是TiO2（0.04 H〜（-1）），AG_（0.005）-TIO2（0.186 H〜（-1））和C_（2.0）-TiO2（0.897 H 〜（-1））。增强的可见光催化活性可以归因于银和碳掺杂的协同作用以及硅的引入。用ESR技术验证了光催化反应机制。此外，羟基自由基和超氧化物自由基在光催化反应中都起着关键作用，此外，在ESR实验中发现了DMPO-·H。

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