Enhanced photocatalytic removal of NO over titania/hydroxyapatite (TiO2/HAp) composites with improved adsorption and charge mobility ability

doi:10.1039/c7ra02157g

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	Enhanced photocatalytic removal of NO over titania/hydroxyapatite (TiO2/HAp) composites with improved adsorption and charge mobility ability
	Lee, Shun Cheng 3; Wang, Yawen 1; Zhang, Yufei 4; Chen, Meijuan 5; Yao, Jie 1,4; Huang, Yu 4; Cao, Junji 4; Ho, Wingkei 2
刊名	RSC ADVANCES
	2017
卷号	7 期号:40 页码:24683-24689
DOI	10.1039/c7ra02157g
文献子类	Article
英文摘要	Effective photocatalysis processes with production of fewer toxic intermediates are highly desirable for air purification. In this study, titania/hydroxyapatite (TiO2/HAp) composites were synthesized by a facile hydrothermal method and employed to decontaminate nitric oxide (NO) in air under simulated solar light irradiation for the first time. It was found that the photocatalytic activity of the as-prepared TiO2/HAp composite (44.61%) was superior to those of the pristine components (TiO2: 38.57%, HAp: 36.73%) and mechanically mixed samples (35.36%). The TiO2/HAp composite with mass ratio of 3 : 1 (75% TiO2/HAp) exhibited the highest NO removal efficiency among them. Moreover, the toxic intermediate NO2 production was significantly inhibited over TiO2/HAp. These synergistically improved properties can be ascribed to the high separation efficiency and faster transfer of the photo-generated charge carriers as evidenced by the experimental results from photocurrent tests and electrochemical impedance spectroscopy (EIS). The results from temperature programmed desorption (TPD) confirmed that the 75% TiO2/HAp sample had stronger chemisorption for NO due to the increased concentration of surface OH groups. Furthermore, the electron spin resonance (ESR) characterization suggested that O-center dot(2)- and (OH)-O-center dot radicals were the major species involved for NO removal over TiO2/HAp composites. The five recycling tests suggested that the TiO2/HAp has superior photocatalytic stability. This study suggests that the combination of TiO2 with HAp is an effective approach for air purification.
WOS关键词	LIGHT IRRADIATION ; RHODAMINE-B ; HYDROXYAPATITE ; DEGRADATION ; PERFORMANCE ; HETEROSTRUCTURE ; HETEROJUNCTIONS ; NANOCOMPOSITES ; DECOMPOSITION ; FABRICATION
WOS研究方向	Chemistry
语种	英语
WOS记录号	WOS:000401525700017
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5469]
专题	地球环境研究所_粉尘与环境研究室
作者单位	1.Taiyuan Univ Technol, Coll Chem & Chem Engn, Taiyuan 030024, Peoples R China 2.Educ Univ Hong Kong, Dept Sci & Environm Studies, Hong Kong, Hong Kong, Peoples R China 3.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China 4.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem Phys, Xian 710061, Peoples R China 5.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Peoples R China
推荐引用方式 GB/T 7714	Lee, Shun Cheng,Wang, Yawen,Zhang, Yufei,et al. Enhanced photocatalytic removal of NO over titania/hydroxyapatite (TiO2/HAp) composites with improved adsorption and charge mobility ability[J]. RSC ADVANCES,2017,7(40):24683-24689.
APA	Lee, Shun Cheng.,Wang, Yawen.,Zhang, Yufei.,Chen, Meijuan.,Yao, Jie.,...&Ho, Wingkei.(2017).Enhanced photocatalytic removal of NO over titania/hydroxyapatite (TiO2/HAp) composites with improved adsorption and charge mobility ability.RSC ADVANCES,7(40),24683-24689.
MLA	Lee, Shun Cheng,et al."Enhanced photocatalytic removal of NO over titania/hydroxyapatite (TiO2/HAp) composites with improved adsorption and charge mobility ability".RSC ADVANCES 7.40(2017):24683-24689.