期刊
APPLIED SURFACE SCIENCE
卷 476, 期 -, 页码 205-220出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.01.080
关键词
Bio-template; Heterojunction photocatalyst; Core-shell; Co-doping; Interstitial doping; Photocatalytic hydrogen production
类别
资金
- Ministry of Higher Education of Malaysia [FRGS/1/2017/TK10/UKM/01/3]
- Universiti Kebangsaan Malaysia
- Australian government (Department of Education and Training) for 2018 Endeavour Australia Cheung Kong Research Fellowship award at University of New South Wales, Sydney
For the first time, C-doped g-C3N4@C, N co-doped TiO2 core-shell heterojunction photocatalyst was successfully prepared by an in-situ one-pot hydrothermal bio-template approach, assisted by calcination treatment at 500 degrees C. Kapok fibre was used as a bio-templates and in-situ C doping in g-C3N4 and TiO2 during the formation of core-shell heterojunction photocatalyst. Moreover, the used of urea as g-C3N4-precursor also contribute to band-gap narrowing by an in-situ carbon and nitrogen doping in TiO2. Various characterisation techniques were employed to understand the effect TiO2 precursor concentration on the evolution of core-shell nanostructure heterojunction photocatalyst that can affect and boost the catalytic activity. The detailed understanding of the concurrent growth of C-doped g-C3N4(CCN) and C, N co-doped TiO2 mechanism, as well as the formation of core-shell nanostructures heterojunction formation, are also proposed in this study. Our finding indicated that the biotemplate core-shell nanostructure heterojunction photocatalysts showed a dramatic increase in photoinduced electron-hole separation efficiency as demonstrated by the photoelectrochemical and photoluminescence analyses. The enhancement in photogenerated charge carrier separation and narrower band gap resulted in superior photocatalytic activities with the highest rate of hydrogen production was recorded by CCN/T-1.5 sample (625.5 mu mol h(-1) g(-1)) in methanol aqueous solution. The well-developed interconnected heterojunction formation with appropriate CCN and TiO2 contents in core-shell nanoarchitectures system is a prime factor for the future design of a highly efficient visible-light-driven photocatalyst.
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