Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 93, Issue -, Pages 603-615Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jtice.2018.09.005
Keywords
Homologous heterojunction; CdTe; N-rGO; Photocatalytic; 2,4-dichlorophenol
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Funding
- National Natural Science Foundation of China [21576125]
- Natural Science Foundation of Jiangsu Province [BK20151349]
- China Postdoctoral Science Foundation [2017M611716, 2017M611734]
- Six talent peaks project in Jiangsu Province [XCL-014]
- Zhenjiang Science & Technology Program [SH2016012]
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CdTe nanoparticles modifying leafy CdS homologous semiconductor heterojunctions on nitrogen-doped reduced graphene oxide with solar full spectrum response is synthesized by a simple hydrothermal method and solvothermal method, and investigate their photocatalystic degradation of 2,4-dichlorophenol (2,4-DCP). The obtained CdTe/CdS/N-rGO composites show stronger intensity of photocurrent and longer lifetime of photon-generated carrier than CdTe/CdS and raw CdS, especially by which 70% 50 mg/L 2,4-DCP could be decomposed under visible light irradiation within 6 h. These result from those CdTe nanoparticles have good optical absorption coefficient to effectively absorb more photons and form electronic traps on its surface atoms, and construct homologous semiconductor heterojunctions between CdTe and leafy CdS to change movement pathway of photogenerated charge carriers, further prolonging the lifetime of electrons and holes, and loading nitrogen-doped reduced graphene oxide (N-rGO) could not contribute to electrons transfer, but also provide more active sites to improve the whole photocatalytic ability. These are further confirmed by those that high-resolution transmission electron microscopy (HRTEM) shows that crystal lattices of CdTe and CdS are staggered and the diffuse reflectance spectra (DRS) demonstrated absorption edge of CdTe/CdS/N-rGO get tremendous improved, even ternary composites could response in solar full spectrum. The new approach may provide some inspirations for constructing homologous heterojunctions structure on materials as support with efficient photocatalytic performance. (C) 2018 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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