UV Irradiation Induced Transformation of TiO2 Nanoparticles in Water: Aggregation and Photoreactivity

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	UV Irradiation Induced Transformation of TiO2 Nanoparticles in Water: Aggregation and Photoreactivity
	Jing Sun,Liang-Hong Guo,Hui Zhang,and Lixia Zhao
刊名	Environmental Science & Technology
	2014
期号	48 页码:11962−11968
中文摘要	Transformation of nanomaterials in aqueous environment has significant impact on their behavior in engineered application and natural system. In this paper, UV irradiation induced transformation of TiO2 nanoparticles in aqueous solutions was demonstrated, and its effect on the aggregation and photocatalytic reactivity of TiO2 was investigated. UV irradiation of a TiO2 nanoparticle suspension accelerated nanoparticle aggregation that was dependent on the irradiation duration. The aggregation rate increased from <0.001 nm/s before irradiation to 0.027 nm/s after 50 h irradiation, resulting in aggregates with a hydrodynamic diameter of 623 nm. The isoelectric point of the suspension was lowered from 7.0 to 6.4 after irradiation, indicating less positive charges on the surface. ATR-FTIR spectra displayed successive growth of surface hydroxyl groups with UV irradiation which might be responsible for the change of surface charge and aggregation rate. UV irradiation also changed the photocatalytic degradation rate of Rhodamine B by TiO2, which initially increased with irradiation time, then decreased. Based on the photoluminescence decay and photocurrent collection data, the change was attributed to the variation in interparticle charge transfer kinetics. These results highlight the importance of light irradiation on the transformation and reactivity of TiO2 nanomaterials.
公开日期	2015-03-27
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/9689]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Jing Sun,Liang-Hong Guo,Hui Zhang,and Lixia Zhao. UV Irradiation Induced Transformation of TiO2 Nanoparticles in Water: Aggregation and Photoreactivity[J]. Environmental Science & Technology,2014(48):11962−11968.
APA	Jing Sun,Liang-Hong Guo,Hui Zhang,and Lixia Zhao.(2014).UV Irradiation Induced Transformation of TiO2 Nanoparticles in Water: Aggregation and Photoreactivity.Environmental Science & Technology(48),11962−11968.
MLA	Jing Sun,Liang-Hong Guo,Hui Zhang,and Lixia Zhao."UV Irradiation Induced Transformation of TiO2 Nanoparticles in Water: Aggregation and Photoreactivity".Environmental Science & Technology .48(2014):11962−11968.