Enhanced photocatalytic activity of CaTiO3-graphene nanocomposites for dye degradation

doi:10.1088/0031-8949/89/11/115801

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	Enhanced photocatalytic activity of CaTiO3-graphene nanocomposites for dye degradation
	Xian, T.1,2; Yang, H.1,2; Huo, Y. S.2
刊名	PHYSICA SCRIPTA
	2014-11
卷号	89 期号:11
关键词	CaTiO3 nanoparticles CaTiO3-graphene composites photocatalysis hydroxyl radicals
ISSN号	0031-8949
DOI	10.1088/0031-8949/89/11/115801
英文摘要	Calcium titanate (CaTiO3) nanoparticles with an average size of 36 nm were synthesized by a polyacrylamide route. CaTiO3-graphene composites were fabricated by mixing CaTiO3 particles and graphene into absolute ethanol, followed by thermal drying. The prepared samples were characterized by x-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and UV-visible diffuse reflectance spectroscopy. Methyl orange (MO) was chosen as the target pollutant to evaluate the photocatalytic activity of the samples under UV irradiation. Our results show that CaTiO3-graphene composites exhibit enhanced photocatalytic activity compared to bare CaTiO3 particles. This can be explained by the effective suppression of electron-hole pair recombination due to the transfer of photogenerated electrons from the conduction band of CaTiO3 to graphene sheets. Hydroxyl (center dot OH) radicals were detected by fluorimetry using terephthalic acid as a probe molecule, revealing an enhanced yield on the irradiated CaTiO3-graphene composites. Ethanol was used as a center dot OH scavenger to investigate its effect on photocatalytic efficiency as well as on center dot OH radical yields. Based on the experimental results, we suggest that center dot OH radicals are the dominant active species responsible for the dye degradation.
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000346656500026
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/34248]
专题	省部共建有色金属先进加工与再利用国家重点实验室理学院
通讯作者	Xian, T.
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China 2.Lanzhou Univ Technol, Sch Sci, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Xian, T.,Yang, H.,Huo, Y. S.. Enhanced photocatalytic activity of CaTiO3-graphene nanocomposites for dye degradation[J]. PHYSICA SCRIPTA,2014,89(11).
APA	Xian, T.,Yang, H.,&Huo, Y. S..(2014).Enhanced photocatalytic activity of CaTiO3-graphene nanocomposites for dye degradation.PHYSICA SCRIPTA,89(11).
MLA	Xian, T.,et al."Enhanced photocatalytic activity of CaTiO3-graphene nanocomposites for dye degradation".PHYSICA SCRIPTA 89.11(2014).