School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
J Colloid Interface Sci. 2018 Apr 1;515:10-17. doi: 10.1016/j.jcis.2018.01.015. Epub 2018 Jan 4.
An AgCl/AgPO composite has been successfully fabricated by a simple desorption-precipitation method. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectroscopy (UV/Vis), and photoluminescence (PL) have been used to study the structural and physicochemical characteristics of the AgCl/AgPO composite. The photocatalytic activity of the AgCl/AgPO composite has been tested by the degradation of parabens under visible-light irradiation. 100% of MPB was degraded within 40 min in the AgCl/AgPO-visible light system. Moreover, the photocatalytic activity of AgCl/AgPO remained at 94% of the original level after five runs, which was much higher than that of pure AgPO (25%). The obtained results confirmed that the AgCl/AgPO composite exhibited significantly higher photocatalytic performance and improved stability compared with bare AgPO. The enhanced photocatalytic performance of the AgCl/AgPO composite could be mainly attributed to highly efficient charge separation through a synergistic effect of AgCl, AgPO, and in situ photo-reduced Ag nanoparticles. Trapping experiments confirmed h and ·O to be the two main active species in the photocatalytic process. Finally, a possible photocatalytic mechanism for the charge-transfer process is proposed to account for the enhanced photocatalytic performance of the AgCl/AgPO composite.
通过简单的解吸沉淀法成功制备了 AgCl/AgPO 复合材料。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线衍射（XRD）、X 射线光电子能谱（XPS）、紫外-可见分光光度计（UV/Vis）和光致发光（PL）研究了 AgCl/AgPO 复合材料的结构和物理化学特性。通过可见光照射下对对羟基苯甲酸酯的降解来测试 AgCl/AgPO 复合材料的光催化活性。在 AgCl/AgPO-可见光体系中，MPB 在 40min 内完全降解。此外，AgCl/AgPO 的光催化活性在五次循环后仍保持在原始水平的 94%，远高于纯 AgPO（25%）。结果证实，与纯 AgPO 相比，AgCl/AgPO 复合材料表现出更高的光催化性能和更好的稳定性。AgCl/AgPO 复合材料增强的光催化性能主要归因于 AgCl、AgPO 和原位光还原 Ag 纳米粒子的协同作用，从而实现了高效的电荷分离。捕获实验证实 h+和·O2-是光催化过程中的两种主要活性物质。最后，提出了一种可能的电荷转移过程的光催化机理，以解释 AgCl/AgPO 复合材料增强的光催化性能。
