Zinc oxide (ZnO) has been known as an excellent photocatalyst for the degradation of a variety of organic pollutants under UV irradiation. This work describes a synthesis of ZnO nanoparticles via a facile precipitation method, and Ag was doped into Ag/ZnO nanocomposite to improve the photocatalytic degradation of BPA under visible light irradiation. The obtained ZnO nanoparticles were 20 nm in size and had a relatively high surface area and pore volume, 26.2 m2/g and 0.48 cm3/g, respectively. The deposition of Ag led to a decrease in the surface area, pore volume, and band gap energy ( ) of ZnO nanoparticles. However, the photocatalytic activity of Ag/ZnO composite in the case increased. The performance of ZnO was compared with Ag/ZnO composites at the different molar ratios, and the kinetic reaction of BPA in these catalysts was investigated by the first-order kinetic model. The sample of Ag/ZnO-10 composite had the highest catalytic activity and showed the degradation efficiency, reaction rate, and degradation capacity of 100% in 120 min, 0.014 min-1, and 40 mg/g, respectively. In comparison, the effects of Ag/ZnO molar ratio, catalyst dosage, solution pH, and concentration of BPA on photocatalytic degradation were investigated. Additionally, the photocatalytic performance of Ag/ZnO-10 composite was evaluated by the degradation of other persistent organic compounds such as phenol, tartrazine, and methylene blue and compared to other catalysts in literature.

中文翻译：

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ZnO纳米颗粒和Ag/ZnO纳米复合材料的简便制备及其可见光下的光催化活性

氧化锌（ZnO）被认为是一种优良的光催化剂，可用于在紫外线照射下降解多种有机污染物。这项工作描述了一种通过简单沉淀法合成 ZnO 纳米颗粒的方法，并将 Ag 掺杂到 Ag/ZnO 纳米复合材料中以改善可见光照射下 BPA 的光催化降解。获得的氧化锌纳米颗粒的尺寸为 20 nm，具有相对较高的表面积和孔体积，分别为 26.2 m2/g 和 0.48 cm3/g。Ag 的沉积导致 ZnO 纳米粒子的表面积、孔体积和带隙能量 ( ) 的减小。然而，在这种情况下，Ag/ZnO 复合材料的光催化活性增加。比较不同摩尔比下 ZnO 与 Ag/ZnO 复合材料的性能，并通过一级动力学模型研究了BPA在这些催化剂中的动力学反应。Ag/ZnO-10 复合材料的样品具有最高的催化活性，在 120 min、0.014 min-1 和 40 mg/g 内的降解效率、反应速率和降解能力分别为 100%。作为对比，研究了 Ag/ZnO 摩尔比、催化剂用量、溶液 pH 值和 BPA 浓度对光催化降解的影响。此外，Ag/ZnO-10 复合材料的光催化性能通过其他持久性有机化合物（如苯酚、柠檬黄和亚甲蓝）的降解进行评估，并与文献中的其他催​​化剂进行比较。120 分钟、0.014 min-1 和 40 mg/g 的降解能力分别为 100%。作为对比，研究了 Ag/ZnO 摩尔比、催化剂用量、溶液 pH 值和 BPA 浓度对光催化降解的影响。此外，Ag/ZnO-10 复合材料的光催化性能通过其他持久性有机化合物（如苯酚、柠檬黄和亚甲蓝）的降解进行评估，并与文献中的其他催​​化剂进行比较。120 分钟、0.014 min-1 和 40 mg/g 的降解能力分别为 100%。作为对比，研究了 Ag/ZnO 摩尔比、催化剂用量、溶液 pH 值和 BPA 浓度对光催化降解的影响。此外，Ag/ZnO-10 复合材料的光催化性能通过其他持久性有机化合物（如苯酚、柠檬黄和亚甲蓝）的降解进行评估，并与文献中的其他催​​化剂进行比较。