界面电荷快速转移提升铜修饰氧化钨光催化性能

doi:10.15541/jim20200116

无机材料学报 ›› 2021, Vol. 36 ›› Issue (3): 325-331.DOI: 10.15541/jim20200116 CSTR: 32189.14.10.15541/jim20200116

界面电荷快速转移提升铜修饰氧化钨光催化性能

熊金艳¹(), 罗强², 赵凯³, 张梦梦², 韩朝⁴, 程刚²()

1. 武汉纺织大学化学与化工学院, 武汉 430073
2. 武汉工程大学化学与环境工程学院, 武汉 430073
3. 佛山科学技术学院材料科学与氢能学院, 佛山 528000
4. 伍伦贡大学超导与电子材料研究所, 新南威尔士 2500, 澳大利亚

收稿日期:2020-03-06 修回日期:2020-07-14 出版日期:2021-03-20 网络出版日期:2020-08-01
通讯作者: 程刚, 博士, 副教授. E-mail: gchenglab@163.com
作者简介:熊金艳(1986-), 女, 博士. E-mail: xjybear@163.com
基金资助:
湖北省自然科学基金(2019CFB386)

Facilely Anchoring Cu nanoparticles on WO₃ Nanocubes for Enhanced Photocatalysis through Efficient Interface Charge Transfer

XIONG Jinyan¹(), LUO Qiang², ZHAO Kai³, ZHANG Mengmeng², HAN Chao⁴, CHENG Gang²()

1. College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430073, China
2. School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, China
3. School of Materials Science and Hydrogen Energy, Foshan University, Foshan 528000, China
4. Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2500, Australia

Received:2020-03-06 Revised:2020-07-14 Published:2021-03-20 Online:2020-08-01
Contact: CHENG Gang, PhD, associate professor. E-mail: gchenglab@163.com
About author:XIONG Jinyan(1986-), female, PhD. E-mail: xjybear@163.com
Supported by:
Hubei Provincial Natural Science Foundation(2019CFB386)

摘要/Abstract

摘要：

非贵金属修饰可以有效增强单一半导体的光生电荷分离, 进而改善光催化活性。采用一种简单的抗坏血酸室温还原法制备了WO₃-Cu复合光催化材料, 并用不同表征手段对其组成和结构进行了表征。结果显示, Cu颗粒沉积在WO₃纳米立方的表面, 在模拟太阳光照射下, 与WO₃相比, WO₃-Cu复合材料具有良好的光催化降解刚果红的能力。活性物种捕捉实验以及顺磁共振结果表明, 光诱导产生的空穴、羟基自由基、超氧自由基阴离子等活性物种在刚果红降解过程中起主要作用。根据光电化学测试结果, WO₃在光催化过程中产生的电子快速转移向Cu颗粒, 可以有效分离光生电子-空穴对并加快光生载流子迁移, 进而有利于光催化反应的发生, 从而使WO₃表现出较高的光催化活性。

关键词: 半导体, 金属复合材料, WO₃-Cu 纳米复合材料, 污染物降解, 光催化

Abstract:

Non-noble metal decoration is a promising strategy for promoting semiconductor photocatalysis by effectively enhancing charge separation. Cube-like WO₃-Cu hybrid was successfully synthesized by a facile ascorbic acid reduction method at room temperature. The composition and morphology characterization showed that the Cu particle was deposited on the surface of WO₃nanocube. The WO₃-Cu-1.0 hybrid (when 1.0 mmol CuSO₄?5H₂O was involved into the reaction system) exhibited promoted photocatalytic capability towards Congo Red photodegradation under simulated sun light irradiation. The trapping experiments of active species during photocatalysis and ESR spectra of DMPO?OH signal of WO₃-Cu-1.0 composite confirmed that the photogenerated holes (h ⁺), ?OH, and ?O₂ ^-were the predominant active species during Conge Red degradation. Based on the photo/electro-chemical measurements, it was proposed that efficient charge transfer was accomplished between the WO₃ nanocube and Cu nanoparticles, which promoted electron-holes separation and subsequently photocatalysis reaction in the Congo Red solution. This work provides a facile preparation method for a binary photocatalyst system in which a semiconductor coupled with non-noble metal.

Key words: semiconductors, metallic composites, WO₃-Cu nanocomposites, pollutants degradation, photocatalysis

中图分类号:

TB33

熊金艳, 罗强, 赵凯, 张梦梦, 韩朝, 程刚. 界面电荷快速转移提升铜修饰氧化钨光催化性能[J]. 无机材料学报, 2021, 36(3): 325-331.

XIONG Jinyan, LUO Qiang, ZHAO Kai, ZHANG Mengmeng, HAN Chao, CHENG Gang. Facilely Anchoring Cu nanoparticles on WO₃ Nanocubes for Enhanced Photocatalysis through Efficient Interface Charge Transfer[J]. Journal of Inorganic Materials, 2021, 36(3): 325-331.

图/表 6

Fig. 1 (a) Photographs and (b) XRD-patterns of WO3-Cu samples

Fig. 2 (a) UV-Vis diffuse reflectance spectra (DRS) and (b) plots of (ahv)1/2 vs the photon energy (hv) for the WO3-Cu hybrid and WO3 nanocube

Fig. 3 SEM images of (a) WO3 and (b) WO3-Cu-1.0 sample, (c) EDX spectrum of WO3-Cu-1.0 sample, (d) TEM and (e) HRTEM images of WO3-Cu-1.0 sample, and (f-i) EDX mappings of WO3-Cu-1.0 sample

Fig. 4 (a) Photocatalytic performance and (b) CR degradation reaction dynamics of different samples, (c) pseudo-first-order constant k for the different products, and (d) cycling photodegradation of CR upon WO3-Cu-1.0

Fig. 5 (a) Effect of scavengers on the photocatalytic degradation and (b) photocatalytic degradation of CIP (40 mL, 20 mg/L) upon WO3-Cu-1.0 composite (20 mg); (c) DMPO ?OH EPR spin-trapping spectra of WO3-Cu-1.0 composite upon sun light irradiation by a 500 W Xe lamp

Fig. 6 (a) Photocurrent response and (b) EIS of WO3 and WO3-Cu-1.0, and (c) proposed pathways for photocatalytic degradation of Congo Red

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界面电荷快速转移提升铜修饰氧化钨光催化性能

Facilely Anchoring Cu nanoparticles on WO₃ Nanocubes for Enhanced Photocatalysis through Efficient Interface Charge Transfer

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界面电荷快速转移提升铜修饰氧化钨光催化性能

Facilely Anchoring Cu nanoparticles on WO3 Nanocubes for Enhanced Photocatalysis through Efficient Interface Charge Transfer

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Facilely Anchoring Cu nanoparticles on WO₃ Nanocubes for Enhanced Photocatalysis through Efficient Interface Charge Transfer