A Z-scheme mechanism of the novel ZnO/CuO n-n heterojunction for photocatalytic degradation of Acid Orange 7

被引:66
作者
Ruan, Shuhong [1 ,2 ]
Huang, Wenqian [2 ]
Zhao, Mengjiu [2 ]
Song, Haiyan [1 ,2 ,3 ]
Gao, Zhihong [2 ]
机构
[1] Guangdong Univ Technol, Sch Environm Sci & Engn, Inst Environm Hlth & Pollut Control, Guangzhou Key Lab Environm Catalysis & Pollut Con, Guangzhou 510006, Guangdong, Peoples R China
[2] South China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China
[3] Guangdong Prov Key Lab Environm Protect & Resourc, Guangzhou 510006, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
ZnO/CuO; n-n heterojunction; Z-scheme mechanism; Photocatalytic activity; P-TYPE; WATER; ZNO; EFFICIENT; CUO; COMPOSITE; NANOCOMPOSITES; PERFORMANCE; FABRICATION; OXIDATION;
D O I
10.1016/j.mssp.2019.104835
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A series of novel ZnO/CuO n-n heterojunction photocatalysts were synthesized with a microwave assisted method. The structures, morphologies, optical properties, and chemical states of these prepared photocatalysts were systematically characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The results indicated that the crystalline structures and morphologies of ZnO and ZnO/CuO are both quasi-sphere shape wurtzite structures. The photocatalytic activities of ZnO/CuO heterojunction were evaluated by the degradation of Acid Orange 7 under simulated solar light irradiation. The results indicated that the ZnO/CuO n-n heterojunctions all have higher photocatalytic activities than the pure ZnO and the ZnO/CuO(2) sample with 2% of CuO exhibits the highest performance for degradation of Acid Orange 7. These could be due to the effective enhancement of electron-hole separation and weaken charge transfer resistance in ZnO/CuO n-n heterojunction, as indicated by their photoluminescences, the electrochemical impedance spectra, and photocurrent responses. Finally, Z-scheme electron transfer mechanism was proposed as the major photocatalytic mechanism of ZnO/CuO materials.
引用
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页数:10
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