| 三角形Au@TiO2介孔催化剂可见光降解亚甲蓝 | |
| Visible light degradation of methylene blue from water by triangle Au@TiO2 mesoporous catalyst | |
| 摘要: 利用溶胶凝胶法制备出一种三角形Au@TiO2核壳材料。经过水热晶化，该材料膨胀至300 nm，壳层TiO2晶化为介孔锐钛矿相，但核心三角形Au颗粒的形貌保持不变。采用粉末X射线衍射(PXRD)、ζ电位、高分辨透射电子显微镜(HRTEM)、热重分析(TGA)、光致发光(PL)光谱、光电流(i-t)以及光催化降解技术，对样品的结构和性能进行了系统、详细的检测与分析。经过晶化处理的Au@TiO2在可见光波段的光降解亚甲蓝性能比未晶化时有了显著的提升，1 mg·mL-1 Au@c-TiO2可以在可见光照射1 h后实现对60 mg·L-1亚甲蓝全降解。电子顺磁共振(EPR)测试表明·O2-和·OH两种自由基对光降解起到了很大作用。通过综合分析实验结果和时域有限差分(FDTD)分析，探究了催化反应的机理。 | |
| 关键词: 光降解 二氧化钛 三角形金颗粒 可见光 | |
| 基金项目: 国家自然科学基金（No.21671019，21231002，21471016）、111项目（No.B07012）和973项目（No.2014CB932103）资助。 | |
| Abstract: TiO2-coated triangle Au with a core-shell structure (Au@TiO2) was synthesized using the sol-gel method. After hydrothermal crystallization, the particle size expanded to 300 nm with crystallization of the shell TiO2 into a mesoporous anatase phase, while the morphology of the triangle Au particle remained unchanged. The structure and properties of the samples were characterized using powder X-ray diffraction (PXRD), ζ potential, high-resolution transmission electron microscopy (HRTEM), thermogravimetric analysis (TGA), photoluminescence (PL) spectroscopy, photocurrent (i-t) measurements, and methylene blue (MB) photodegradation tests. The results revealed that the photocatalytic degradation rate of crystallized triangle Au@TiO2 was significantly higher than that of the amorphous material. Specifically, 1 mg·mL-1 Au@c-TiO2 achieved complete degradation of 60 mg·L-1 MB after one hour of visible light irradiation. An electron paramagnetic resonance (EPR) experiment was conducted, indicating that ·O2- and ·OH are the active species responsible for the degradation process. By combining experimental results with finitedifference time-domain (FDTD) analysis, we proposed a mechanism for the photodegradation process. | |
| Keywords: photodegradation TiO2 triangle Au particle visible light | |
| 投稿时间：2023-10-21 修订日期：2024-01-10 | |
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| 刘兵,张黄,韩洪亮,胡长文,张英磊.三角形Au@TiO2介孔催化剂可见光降解亚甲蓝[J].无机化学学报,2024,40(5):941-952. | |
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