The enhanced photocatalytic activity of ZnO nanorods/CuO nanourchins composite prepared by chemical bath precipitation

被引：38
作者：
Nami, Mohammad [1 ]
Rakhsha, Amirhossein [1 ,2 ]
Sheibani, Saeed [1 ]
Abdizadeh, Hossein [1 ]
机构：
[1] Univ Tehran, Sch Met & Mat Engn, Coll Engn, POB 11155-4563, Tehran, Iran
[2] McMaster Univ, Dept Chem Engn, Hamilton, ON, Canada
来源：
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2021年 / 271卷
关键词：
ZnO; CuO; Nanocomposite; Photocatalyst; Photodegradation; OPTICAL-PROPERTIES; METHYLENE-BLUE; TEXTILE DYE; COATED ZNO; BAND-GAP; DEGRADATION; CUO; HETEROJUNCTION; NANOCOMPOSITES; CONSTRUCTION;
D O I：
10.1016/j.mseb.2021.115262
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, ZnO nanorods (NRs)/CuO nanourchins (NUs) were composed together to achieve the highest efficiency in methylene blue (MB) degradation. The nanocomposites were fabricated via a one-step, facile, and solution-based method named chemical bath precipitation. Crystal structures of hexagonal ZnO NRs and monoclinic CuO NUs phases were detected by X-ray diffraction (XRD) analysis, while field emission scanning electron microscopy (FESEM) confirmed the formation of ZnO NRs and CuO NUs with favorable interconnectivity. The chemical bonding stage of the Cu2+, Zn2+, and O2- were investigated with high-resolution Xray photoelectron spectroscopy (HRXPS). Brunauer-Emmett-Teller (BET) method depicted a relatively wide pore size distribution for all the samples. Diffuse reflectance spectroscopy (DRS) demonstrated that band gap energy of ZnO NRs further narrowed by raising CuO concentration owing to the formation of the Cu(3d) energy state near the Zn(3d) valance band. Photoluminescence (PL) spectra revealed that the combination of ZnO NRs with CuO NUs significantly increased the lifetime of the photo-excited charge carriers. The ZnO/(10 mol%)CuO nanocomposite with the band gap energy of 2.9 eV and pore volume of 0.0180 cm3/g exhibited the highest efficiency and complete degradation of MB in less than 240 min. The photo-degradation kinetics of the asprepared nanocatalyst followed a pseudo-first-order reaction model and exhibited about 12 times faster than ZnO. Finally, the photo-degradation mechanisms are proposed based on the role of reactive oxygen species and photo-generated charge carriers.
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页数：9
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