摘要
采用光沉积法在铁电钛酸钡(BTO)表面负载纳米银粒子,使用XRD、SEM/EDX、TEM和XPS对光催化剂的微观结构进行表征,结果表明随着光沉积时间的延长,纳米银粒子的尺寸与负载量均有所增加.光沉积时间为30s时,表面银粒子的尺寸约为5nm,此时模拟太阳光下光催化降解罗丹明B的效率最高,约为BTO的7.5倍,这主要归因于贵金属的电子陷阱作用和表面等离子共振引起的可见光吸收增强.此外,通过对比OH·捕获剂-乙醇加入前后光催化效率的变化,证明OH·对光降解起主要作用.
Silver nanoparticles were photodeposited onto the surface of ferroelectric barium titanate.The microstructure and photocatalytic properties of the obtained photocatalysts were investigated by using XRD銆丼EM/EDX銆乀EM銆乆PS and UV Vis spectroscopy.With increasing the photodeposition time,the size and amount of surface loaded silver nanoparticles increase as well.The highest photodegradation rate of Rhodamine B was obtained in Ag BTO30s,where the silver particle size was roughly5nm.Its photodegradation rate was about7.5times that of BTO.This improved photocatalytic activity was attributed to the electron trap roles of noble metal silver and the enhanced absorption in the visible light range arising from surface plasmon resonance.Finally,the critical role of OH路in photodegradation was verified by the significantly decreased photodegradation after the addition of ethanol which is considered as a OH路scavenger.
作者
崔永飞
刘冲
刘航
师裕
蒲永平
CUI Yong fei;LIU Chong;LIU Hang;SHI Yu;PU Yong ping(School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi‘an 710021, China))
出处
《陕西科技大学学报》
CAS
2017年第6期45-49,55,共6页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(51602185)
中国博士后科学基金资助项目(2017M613038)
陕西省教育厅专项科研计划项目(17JK0083)
陕西科技大学博士科研启动基金项目(2016BJ-09)
陕西科技大学大学生创新创业训练计划项目(1334)
关键词
铁电
钛酸钡
光催化
ferroelectric
barium titanate
photocatalysis
