摘要
通过溶胶-凝胶制备过程中水含量控制,分别获得了硫酸根修饰的TiO_2(25)和无修饰的TiO_2(150)两种二氧化钛载体。在两种载体上,通过浸渍法引入不同浓度的碳点胶体,获得了系列不同C含量的Cx/TiO_2(25)和Cx/TiO_2(150)催化剂。利用TEM、XRD、FT-IR、UV-Vis、BET、XPS等表征分析了催化剂的表面形貌、晶格间距、晶型结构、光吸收、孔结构及元素组成。结果显示:相对于无硫酸根修饰的TiO_2(150)催化剂,硫酸根修饰的TiO_2(25)催化剂的光吸收发生显著红移,展示了更宽的可见光响应;对于TiO_2(25)样品,C的引入可提高其O_(ads)/O_(latt)比值。催化性能研究显示,C的引入可以提高其光催化活性。
The SO4^2-modified TiO2(25) and the unmodified TiO2(150) have been prepared by sol-gel method via controlling the amount of introduced deionized water.Two series of C modified Cx/TiO2(25) and Cx/TiO2(150) samples were obtained by impregnating the TiO2(25) and TiO2(150) in carbon dots solution with various concentrations.The lattice spacing,crystalline,light absorption,pore size,specific surface area and element composition of the prepared catalysts were characterized by TEM,XRD,FT-IR,UV-Vis,BET and XPS.The results indicated that compared with the unmodified TiO2(150),the SO4^2- modified TiO2(25) exhibited a distinct red shift phenomenon and broader visible light response for the light absorption.Moreover,the Oads/Olatt ratios can be improved distinctly for the TiO2(25) when the carbon dots were introduced.The catalytic performance showed that the addition of C can enhance the corresponding photocatalytic activity.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2017年第11期4414-4422,共9页
CIESC Journal
基金
国家自然科学基金项目(51572004)
安徽省高校自然科学基金重大项目(KJ2016SD06)
安徽工程大学校级杰出青年科学基金项目(2016JQ01)
安徽工程大学2016年中青年拔尖人才培养计划项目(2016BJRC002)~~
关键词
硫酸根
复合材料
纳米材料
催化剂
碳点
光催化
制氢
SO4^2-
composites
nanomaterials
catalyst
carbon dots
photocatalytic
hydrogen production