Devoloping efficient wastewater treatment photocatalysts capable of improving water quality is undoubtedly one of the main problems of present society. In recent years, novel plasmonic photocatalysts have shown new possible applications in photocatalytic wastewater treatment due to their unique properties. In this work, a novel Ag/AgBr/KYSbO composite was successfully fabricated by photo-reduction using the pre-prepared AgBr/KYSbO and KYSbO (KYSbO). The AgBr/KYSbO and KYSbO were synthesized by deposition-precipitation and precipitation-heating methods. The visible-light photocatalytic performance of parent KYSbO and Ag/AgBr/KYSbO composite was evaluated using methylene blue (MB) as a model organic pollutant. The effects of catalyst dosage, pH and the initial concentration of the MB dye solution on the photocatalytic activity were also investigated in this study. Remarkably, the Ag/AgBr/KYSbO composite exhibited superior visible-light photocatalytic activity for the degradation of MB than that of parent KYSbO. MB was degraded to 91.6% in the presence of parent KYSbO after visible irradiation of 180 min, while 93.2% degraded in merely 30 min in the case of Ag/AgBr/KYSbO composite. The superior improvement in the photocatalytic activity of the Ag/AgBr/KYSbO composite can be credited to the efficient separation of photoinduced electron-hole pairs and the extended visible-light response range. Superoxide radicals are crucial for MB photocatalytic degradation in the Ag/AgBr/KYSbO composite. The possible photocatalytic mechanism was proposed.

中文翻译：

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具有增强光催化性能的新型Ag/AgBr/K0.4Y0.7Sb2O6.25纳米复合材料的合成

开发能够改善水质的高效废水处理光催化剂无疑是当今社会的主要问题之一。近年来，新型等离子体光催化剂由于其独特的性能在光催化废水处理中显示出新的可能应用。在这项工作中，利用预先制备的AgBr/KYSbO和KYSbO（KYSbO）通过光还原成功制备了新型Ag/AgBr/KYSbO复合材料。采用沉积-沉淀法和沉淀-加热法合成了AgBr/KYSbO和KYSbO。使用亚甲蓝（MB）作为模型有机污染物评估母体 KYSbO 和 Ag/AgBr/KYSbO 复合材料的可见光光催化性能。本研究还研究了催化剂用量、pH 值和 MB 染料溶液的初始浓度对光催化活性的影响。值得注意的是，Ag/AgBr/KYSbO 复合材料在降解 MB 方面表现出比母体 KYSbO 更优异的可见光光催化活性。在母体 KYSbO 存在的情况下，可见光照射 180 分钟后，MB 降解至 91.6%，而 Ag/AgBr/KYSbO 复合材料仅 30 分钟就降解了 93.2%。 Ag/AgBr/KYSbO 复合材料光催化活性的优异提高可归因于光生电子空穴对的有效分离和可见光响应范围的扩展。超氧自由基对于 Ag/AgBr/KYSbO 复合材料中 MB 光催化降解至关重要。提出了可能的光催化机理。