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Enhanced intrinsic photocatalytic activity of TiO2 electrospun nanofibers based on temperature assisted manipulation of crystal phase ratios

Published online by Cambridge University Press:  19 September 2016

Ammara Riaz Open the ORCID record for Ammara Riaz [Opens in a new window] ,
Hejinyan Qi ,
Yuan Fang ,
Jianfeng Xu ,
Chunmei Zhou Open the ORCID record for Chunmei Zhou [Opens in a new window] ,
Zhengguo Jin ,
Zhanglian Hong ,
Mingjia Zhi  and
Yi Liu
Ammara Riaz
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
Hejinyan Qi
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Yuan Fang
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Jianfeng Xu
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
Chunmei Zhou*
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
Zhengguo Jin
Affiliation:
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Zhanglian Hong
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
Mingjia Zhi
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
Yi Liu
Affiliation:
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
*
a) Address all correspondence to this author. e-mail: cmzhou@zju.edu.cn
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Abstract

TiO2 nanofibers (TNFs) with different anatase/rutile phase ratios were fabricated using electrospinning technique followed by the annealing at different temperatures. The effect of annealing temperatures on their morphology, structural, and optical properties and photocatalytic activity was investigated. The photocatalytic performance of TNFs was evaluated by degradation of methyl orange (MO) in aqueous solution under the irradiation of simulated solar light. Annealing temperature significantly influenced photocatalytic degradation of MO due to the incorporation of rutile phase which suppresses recombination of photoactivated electron and hole pairs. Turnover frequency (TOF) of MO degradation was introduced to describe the intrinsic activity of TNFs. TNFs acquired best anatase/rutile phase ratio (A/R = 83/17) when annealed at 650 °C, resulting in highest TOF value 2394 h−1, two times higher as compared to P25 with similar anatase/rutile phase ratio (A/R = 85/15). Appropriate crystalline structure could be the reason for good photocatalytic activity as well as intrinsic activity of TNFs.

Keywords

catalyticoptical propertiesx-ray diffraction (XRD)

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Type
Articles
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Journal of Materials Research , Volume 31 , Issue 19 , 14 October 2016 , pp. 3036 - 3043
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Copyright
Copyright © Materials Research Society 2016 

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