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Nanomaterials 2019, 9(2), 222; https://doi.org/10.3390/nano9020222

Constructing a Z-scheme Heterojunction of Egg-Like [email protected] [email protected]2 Photocatalyst via a Facile Reflux Method for Enhanced Photocatalytic Performance

1
Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China
2
School of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China
*
Author to whom correspondence should be addressed.
Received: 11 January 2019 / Revised: 31 January 2019 / Accepted: 4 February 2019 / Published: 7 February 2019
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Abstract

A well designed and accurate method of control of different shell thickness and electronic transmission in a Z-scheme [email protected] system is conducive to obtaining an optimum photocatalytic performance. Herein, the Z-scheme heterojunction of egg-like [email protected] [email protected]2photocatalysts with controlled shell thickness (13 nm, 15 nm, 17 nm, 22 nm) were synthesized by a facile reflux method, and the [email protected]2 structure was proved by a series of characterizations. The photodegradation ratio on methylene blue and tetracycline hydrochloride over the [email protected]2 composites with TiO2 shell thickness of 17 nm reached 90% in 250 min and 91% in 5 min, respectively, which was almost 9.8 times and 2.6 times than that of TiO2 and CdS on rhodamine B respectively under visible light. Besides, the higher total organic carbon removal ratio indicated that most of the pollutants were degraded to CO2 and H2O. The Z-scheme electronic transfer pathway was studied through radical species trapping experiments and electron spin resonance spectroscopy. Moreover, the relationship between shell thickness and photocatalytic activity demonstrated that different shell thickness affects the separation of the electron and holes, and therefore affected the photocatalytic performance. In addition, the effects of pollutants concentration, pH, and inorganic anions on photocatalytic performance were also investigated. This work can provide a novel idea for a well designed Z-scheme heterojunction of [email protected] photocatalysts, and the study of photocatalytic performance under different factors has guiding significance for the treatment of actual wastewater. View Full-Text
Keywords: Z-scheme; [email protected]@TiO2; facile reflux method; structure-effective relationship; photodegration Z-scheme; [email protected]@TiO2; facile reflux method; structure-effective relationship; photodegration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Xue, Y.; Wu, Z.; He, X.; Yang, X.; Chen, X.; Gao, Z. Constructing a Z-scheme Heterojunction of Egg-Like [email protected] [email protected]2 Photocatalyst via a Facile Reflux Method for Enhanced Photocatalytic Performance. Nanomaterials 2019, 9, 222.

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