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Preparation of TiO2 Nanocrystals/Graphene Composite and Its Photocatalytic Performance (cited: 1)
Ling-juan Deng*,Yuan-zi Gu,Wei-xia Xu,Zhan-ying Ma
Author NameAffiliationE-mail
Ling-juan Deng* School of Chemistry & Chemical Engineering, Xianyang Normal University, Xianyang 712000, China denglingjuan@163.com 
Yuan-zi Gu School of Chemistry & Chemical Engineering, Xianyang Normal University, Xianyang 712000, China  
Wei-xia Xu School of Chemistry & Chemical Engineering, Xianyang Normal University, Xianyang 712000, China  
Zhan-ying Ma School of Chemistry & Chemical Engineering, Xianyang Normal University, Xianyang 712000, China  
Abstract:
TiO2 nanocrystals/graphene (TiO2/GR) composite are prepared by combining flocculation and hydrothermal reduction technology using graphite oxide and TiO2 colloid as precursors. The obtained materials are examined by scanning electron microscopy, transition electron microscopy, X-ray diffraction, N2 adsorption desorption, and ultraviolet-visible diffuse spec-troscopy. The results suggest that the presence of TiO2 nanocrystals with diameter of about 15 nm prevents GR nanosheets from agglomeration. Owing to the uniform distribution of TiO2 nanocrystals on the GR nanosheets, TiO2/GR composite exhibits stronger light absorption in the visible region, higher adsorption capacity to methylene blue and higher efficiency of charge separation and transportation compared with pure TiO2. Moreover, the TiO2/GR composite with a GR content of 30% shows higher photocatalytic removal efficiency of MB from water than that of pure TiO2 and commercial P25 under both UV and sunlight irradiation.
Key words:  TiO2 nanocrystals/graphene composite, Photocatalyst, Chemical adsorptivity, Extended light absorption, Efficient charge separation
FundProject:
二氧化钛纳米晶/石墨烯复合物的制备及其光催化性能 (cited: 1)
邓玲娟*,古元梓,徐维霞,马占营
摘要:
以氧化石墨和TiO2溶胶为前驱物,结合絮凝与水热技术制备了TiO2纳米晶/石墨烯复合物,表征了产物的结构、形貌、孔隙率、光谱吸收性质. 结果表明:TiO2纳米晶的存在一定程度上阻止了石墨烯片层的重组,TiO2纳米晶/石墨烯复合物较单纯TiO2材料具有更强的吸光性能、对亚甲基蓝分子更强的吸附性能以及更高的电荷分离效率. 在紫外光和太阳光下,TiO2纳米晶/石墨烯复合物对亚甲基蓝的光催化降解效率均高于P25和纯TiO2.
关键词:  二氧化钛纳米晶/石墨烯复合物,光催化,化学吸附性能,可见光吸收,电荷分离效率
DOI:10.1063/1674-0068/27/03/321-326
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