化工环保2024，Vol.44Issue(3)：432-440,9.DOI:10.3969/j.issn.1006-1878.2024.03.018
星状Au@TiO2介孔催化剂光催化降解刃天青
Photocatalytic degradation of resazurin by stellate Au@TiO2 mesoporous catalyst
摘要
Abstract
Stellate Au@TiO2 coated with core-shell structure was prepared using the sol-gel method and subjected to hydrothermal crystallization treatment.The morphology and structure of stellate Au@TiO2 were characterized using various techniques,and the photocatalytic degradation performance of stellate Au@TiO2 on resazurin from the solution was investigated.The degradation mechanism was discussed.Characterization results show that after the crystallization treatment,the morphology of the core stellate Au remains unchanged,while the TiO2 shell transforms from amorphous to anatase phase.The experimental results indicate that the photocatalytic performance of stellate Au@TiO2 is enhanced after the crystallization treatment.Under the conditions of an initial resazurin concentration of 6 mg/L,catalyst dosage of 1 g/L,dark reaction for 30 min,and xenon lamp(500 W)irradiation for 60 min,the removal efficiency of resazurin by stellate Au@TiO2 decreases gradually from 99.2%to 91.0%after four cycles of experiments,demonstrating good reusability.The structure of stellate Au@TiO2 remains unchanged after 4 cycles of use,indicating good stability.The mechanism of photocatalytic degradation of resazurin by stellate Au@TiO2 involves the generation of localized surface plasmon resonance(LSPR)effect by the stellate Au under visible light irradiation.When the accumulated hot electron energy exceeds the work function of Au,the hot electrons rapidly migrate to the TiO2 surface of the stellate Au and participate in the reduction reaction,producing·O2-.Simultaneously,the photo-generated holes on the TiO2 surface oxidize the adsorbed H2O,generating·OH radicals.Resazurin is oxidatively degraded under the action of·O2-and·OH radicals.关键词
光催化/二氧化钛/星状金/可见光Key words
photocatalysis/TiO2/stellate Au/visible light分类
资源环境引用本文复制引用
刘兵,刘智强,张黄,韩洪亮,胡长文,张英磊..星状Au@TiO2介孔催化剂光催化降解刃天青[J].化工环保,2024,44(3):432-440,9.基金项目
国家自然科学基金项目(21173021,21231002,21276026,21471016,21271023) （21173021,21231002,21276026,21471016,21271023）
国家重点基础研究发展计划项目(2014 CB932103) （2014 CB932103）
高等学校学科创新引智计划项目(B07012). （B07012）
