NDLI: Fabrication of composite photocatalyst $g-C_{3}N_{4}–ZnO$ and enhancement of photocatalytic activity under visible light

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Fabrication of composite photocatalyst $g-C_{3}N_{4}–ZnO$ and enhancement of photocatalytic activity under visible light

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Fabrication of composite photocatalyst $g-C_{3}N_{4}–ZnO$ and enhancement of photocatalytic activity under visible light

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Xie, An-jian Qiu, Ling-guang Shen, Yu-hua Zhu, Jun-fa Jiang, Xia Sun, Jia-xin Yuan, Yu-peng
Description	Author Affiliation: Sun JX ( Laboratory of Advanced Porous Materials, and School of Chemistry and Chemical Engineering, Anhui University, Hefei, 230039, China.)
Abstract	The $g-C_{3}N_{4}–ZnO$ composite photocatalysts with various weight percents of ZnO were synthsized by a simple calcination process. The photocatalysts were characterized by powder X-ray diffraction ( PXRD ), scanning electron microscopy ( SEM ), high-resolution transmission electron microscopy ( HR-TEM ), UV-vis diffuse reflection spectroscopy ( UV-vis ), X-ray photoelectron spectroscopy ( XPS ) and thermogravimetric analysis ( TGA ). The PXRD and HR-TEM results show that the composite materials consist of hexagonal wurzite phase ZnO and $g-C_{3}N_{4}.$ The solid-state UV-vis diffuse reflection spectra show that the absorption edge of the composite materials shifts toward the lower energy region and to longer wavelengths in comparison with pure ZnO and $g-C_{3}N_{4}.$ Remarkably, the photocatalytic activity of $g-C_{3}N_{4}–ZnO$ composites has been demonstrated, via photodegradation of Methyl Orange (MO) and p-nitrophenol experiments. The photocatalytic activity of $g-C_{3}N_{4}–ZnO$ for photodegradation of Methyl Orange and p-nitrophenol under visible light irradiation was increased by over 3 and 6 times, respectively, to be much higher than that of single-phase $g-C_{3}N_{4},$ clearly demonstrating a synergistic effect between ZnO and $g-C_{3}N_{4}.$ The concentrations of $Zn^{2+}$ in $g-C_{3}N_{4}–ZnO$ system after a photocatalytic reaction at various reaction times were found to be much lower than those for a ZnO system under the same reaction conditions, indicating that the $g-C_{3}N_{4}–ZnO$ composite possesses excellent long-term stability for a photocatalytic reaction in aqueous solutions. Furthermore, a synergistic photocatalysis mechanism between ZnO and $g-C_{3}N_{4}$ was proposed based on the photodegradation results. Such obviously improved performance of $g-C_{3}N_{4}–ZnO$ can be ascribed mainly to the enhancement of electron–hole separations at the interface of ZnO and $g-C_{3}N_{4}.$
ISSN	14779226
Issue Number	22
Journal	Dalton Trans.
Volume Number	41
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2012-06-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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