摘要
利用溶胶凝胶法制备出一种三角形Au@TiO_(2)核壳材料。经过水热晶化,该材料膨胀至300 nm,壳层TiO_(2)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@TiO_(2)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-TiO_(2)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·O_(2)^(-)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。
TiO_(2)‐coated triangle Au with a core‐shell structure(Au@TiO_(2))was synthesized using the sol‐gel method.After hydrothermal crystallization,the particle size expanded to 300 nm with crystallization of the shell TiO_(2) 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),ζpotential,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@TiO_(2)was significantly higher than that of the amorphous material.Specifically,1 mg·mL^(-1)Au@c‐TiO_(2)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·O_(2)^(-)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.
作者
刘兵
张黄
韩洪亮
胡长文
张英磊
LIU Bing;ZHANG Huang;HAN Hongliang;HU Changwen;ZHANG Yinglei(Beijing Capital Eco-Environment Protection Group Co.,Ltd.,Beijing 100037,China;Beijing Capital Beike Environmental Technology Research Institute Co.,Ltd.,Beijing 100044,China;College of Environment and Energy Engineering,Beijing University of Technology,Beijing 100124,China;Department of Chemistry,Capital Normal University,Beijing 100089,China;College of Chemistry and Chemical Engineering,Beijing Institute of Technology,Beijing 102401,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2024年第5期941-952,共12页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.21671019,21231002,21471016)
111项目(No.B07012)
973项目(No.2014CB932103)资助。
关键词
光降解
二氧化钛
三角形金颗粒
可见光
photodegradation
TiO2
triangle Au particle
visible light
