Department of Chemical Engineering , National Tsing Hua University , Hsinchu , Taiwan , ROC.
Langmuir. 2018 May 1;34(17):5030-5039. doi: 10.1021/acs.langmuir.8b00577. Epub 2018 Apr 16.
A gas-phase-controlled synthetic approach is demonstrated to fabricate Ag-ZnO hybrid nanostructure as a high-performance catalyst for photodegradation of water pollutants. The degradation of rhodamine B (RhB) was used as representative, which were tested and evaluated with respect to the environmental pH and the presence of dodecyl sulfate corona on the surface of the catalyst. The results show that a raspberry-structure Ag-ZnO hybrid nanoparticle cluster was successfully synthesized via gas-phase evaporation-induced self-assembly. The photodegradation activity increased significantly (20×) by using the Ag-ZnO hybrid nanoparticle cluster as a catalyst. A surge of catalytic turnover frequency of ZnO nanoparticle cluster (>20×) was observed through the hybridization with silver nanoparticles. The dodecyl sulfate corona increased the photocatalytic activity of the Ag-ZnO hybrid nanoparticle cluster, especially at the acidic and neutral pH environments (maximum 6×), and the enhancement in catalytic activity was attributed to the improved colloidal stability of ZnO-based nanoparticle cluster under the interaction with RhB. Our work provides a generic route of facile synthesis of the Ag-ZnO hybrid nanoparticle cluster with a mechanistic understanding of the interface reaction for enhancing photocatalysis toward the degradation of water pollutants.
一种气相控制的合成方法被证明可以制造 Ag-ZnO 混合纳米结构作为水污染物光降解的高性能催化剂。以罗丹明 B（RhB）的降解为例，对其进行了测试和评价，考察了环境 pH 值以及催化剂表面十二烷基硫酸盐冠的存在对其的影响。结果表明，通过气相蒸发诱导自组装成功合成了覆盆子状结构的 Ag-ZnO 混合纳米颗粒簇。使用 Ag-ZnO 混合纳米颗粒簇作为催化剂，光降解活性显著提高（提高了 20 倍）。通过与银纳米粒子的杂交，观察到 ZnO 纳米颗粒簇的催化周转率（>20 倍）大幅增加。十二烷基硫酸盐冠增加了 Ag-ZnO 混合纳米颗粒簇的光催化活性，特别是在酸性和中性 pH 环境下（最大提高 6 倍），这种催化活性的增强归因于在与 RhB 相互作用下 ZnO 基纳米颗粒簇胶体稳定性的提高。我们的工作提供了一种简便合成 Ag-ZnO 混合纳米颗粒簇的通用途径，并对增强光催化降解水中污染物的界面反应有了深入的了解。
