Facile fabrication of novel porous graphitic carbon nitride/copper sulfide nanocomposites with enhanced visible light driven photocatalytic performance

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• 作者：Xi Chen ; Huankun Li ; Yuxin Wu ; Hanshuo Wu ; Laidi Wu ; Pengfei Tan ; Jun Pan ; ^{jun.pan@csu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiang Xiong
• 关键词：g-C3N4 ; CuS ; Porous g-C3N4/CuS nanocomposite ; Heterojunction ; Semiconductor photocatalyst
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 August 2016
• 年：2016
• 卷：476
• 期：Complete
• 页码：132-143
• 全文大小：4660 K

文摘

In this work, a novel organic–inorganic heterostructured photocatalyst: porous graphitic carbon nitride (g-C₃N₄) hybrid with copper sulfide (CuS) had been synthesized via a precipitation-deposition method at low temperature for the first time. UV–vis spectroscopy revealed the porous g-C₃N₄/CuS nanocomposites showed a strong and broad visible light absorption. Furthermore, the g-C₃N₄/CuS nanocomposites showed higher photocatalytic activity in the photodegradation of various organic dyes than that of pure g-C₃N₄ and CuS, and the selected sample of g-C₃N₄/CuS-2 exhibited the best photocatalytic activity under visible light. The good photocatalytic activity could be ascribed to the matching of the g-C₃N₄ and CuS band gap energies. Besides, photoluminescent spectra and photoelectrochemical measurements also proved that the CuS/g-C₃N₄ could greatly enhance the charge generation and suppress the charge recombination of photogenerated carriers. According to the experimental result, a possible photocatalytic mechanism has been proposed. Due to the high stability, the porous g-C₃N₄/CuS could be applied in the field of environmental remediation. Our work highlights that coupling semiconductors with well-matched band energies provides a facile way to improve the photocatalytic activity.