球状Au@TiO_(2)的制备及其光催化降解结晶紫性能  

Synthesis of globular Au@TiO_(2) and Its photocatalytic degradation property for crystal violet

作　　者：刘兵 张平敏 张黄 胡长文[4] 韩洪亮[5] 张英磊 郜芸 徐娇 孔凡萍 曹赛龙 张万鹏 金科 陈家林 王伯轩 田乐[6] LIU Bing;ZHANG Pingmin;ZHANG Huang;HU Changwen;HAN Hongliang;ZHANG Yinglei;GAO Yun;XU Jiao;KONG Fanping;CAO Sailong;ZHANG Wanpeng;JIN Ke;CHEN Jialin;WANG Boxuan;TIAN Le(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;Beijing Institute of Technology,Beijing,102401,China;Capital Normal University,Beijing,100089,China;Tiandi Science&Technology Co.,Ltd.,Beijing,100013,China)

机构地区：[1]北京首创生态环保集团股份有限公司,北京100037 [2]北京首创北科环境科技研究院有限公司,北京100044 [3]北京工业大学环境与能源工程学院,北京100124 [4]北京理工大学,北京102401 [5]首都师范大学,北京100089 [6]天地科技股份有限公司,北京100013

出　　处：《环境化学》2024年第8期2822-2833,共12页Environmental Chemistry

基　　金：国家自然科学基金(21173021,21231002,21471016,21271023);973项目(2014CB932103)资助.

摘　　要：利用溶胶凝胶法成功地制备出一种新型的核壳材料——Au@TiO_(2).经过水热晶化,该材料可膨胀至300 nm,壳层TiO_(2)晶化为锐钛矿相,但核心球状Au的形貌保持不变.采用粉末X射线衍射技术(PXRD)、ZETA电位、高分辨透射电子显微镜(HRTEM)、热重分析(TG)、光致发光(PL)、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、详细的检测和分析.经过晶化处理的Au@TiO_(2),其在可见光波段的光降解结晶紫性能比未晶化时有着显著的提升,1 mg·mL^(−1)Au@c-TiO_(2)可以在可见光照射1 h后实现对0.3 g·L^(−1)结晶紫全降解.通过综合分析实验结果和时域有限差分(FDTD),探究了催化反应的机理.该研究为复合材料兼顾形貌稳定和晶化提供了新思路,为其在环境修复领域提供新的应用.TiO_(2) coated globular Au with core-shell structure(Au@TiO_(2))was synthesized by solgel method.After hydrothermal crystallization,the particle size expands to 300 nm,while the morphology of globular Au has no change.The structure and properties of the samples were characterized by powder X-ray diffraction(PXRD),ZETA potential,high resolution transmission electron microscope(HRTEM),thermos gravimetry analysis(TG),photoluminescence(PL),photocurrent(i-t)and crystal violet photodegradation.The results show that the photocatalytic degradation rate of crystallized globularAu@TiO_(2) is much higher than that of amorphous.After 1 hour of visible light irradiation,1 mg·mL^(−1) Au@c-TiO_(2) can achieve full degradation of 0.3 g·L^(−1) crystal violet.Based on experimental result and finite difference time domain(FDTD)analysis,we proposed a photodegradation mechanism.This study provides a new approach for composite materials to balance morphology stability and crystallization,and provides new applications in the field of environmental remediation.

关 键 词：光催化 可见光 二氧化钛 球状金. 

分 类 号：X-1[环境科学与工程] O6[理学—化学]