The Construction of a ZnO/CdS Heterostructure with Synergistic Enhanced Effect in Photocatalytic and Self-Cleaning Perfo
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https://doi.org/10.1007/s11664-020-08555-3 Ó 2020 The Minerals, Metals & Materials Society
The Construction of a ZnO/CdS Heterostructure with Synergistic Enhanced Effect in Photocatalytic and Self-Cleaning Performance TINGLAN WANG,1 ZHIJUN WANG,2 BINHUA CAO,2 QIAO CHEN,1 BOYOU WANG,1 ZHE GONG,1 and YONGQIAN WANG1,3,4 1.—Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, 388# Lumo Road, Wuhan 430074, People’s Republic of China. 2.—Yantai Coastal Geological Survey Center, China Geological Survey, 287# Jichang Road, Yantai 264004, People’s Republic of China. 3.—The Key Laboratory of Forensic science in Hubei province, Hubei University of Police, 99# South Mud Bay Avenue, Wuhan 430034, People’s Republic of China. 4.—e-mail: [email protected]
In this work, we explore the synergy of the photocatalytic reaction endowed with improvement of self-cleaning performance. A ZnO/CdS heterostructure was successfully synthesized by hydrothermal-chemical bath deposition on a zinc substrate. The effect of different experimental parameters for its structure and properties were systematically studied using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and UV–Vis spectrophotometry. In addition, superhydrophobic ZnO/CdS was treated by stearic acid modification with a contact angle as high as 160 ± 1.5° and rolling angle as low as 5 ± 1.2°. In the self-cleaning test and photocatalytic degradation test, the superhydrophobic heterostructure exhibited excellent anti-fouling properties and photocatalytic performance. Moreover, after the photocatalytic degradation test, the contact angle of the modified superhydrophobic surface remained 142 ± 2.4°. Key words: ZnO/CdS heterostructure, superhydrophobic, self-cleaning, photocatalytic
INTRODUCTION Inspired by natural materials such as lotus1,2 and self-cleaning technology4,5 has butterflies,3 attracted research focus recently, due to its multidomain applications, such as building glass,6 textiles,7 and solar panels.8 Superhydrophobicity is one of the strategies to achieve self-cleaning for the process of removing dust by rolling water droplets on the surface.5 At present, there are many methods and materials for the construction of a superhydrophobic surface, mainly from two aspects: the construction of roughness or the modification of low
(Received July 14, 2020; accepted October 8, 2020)
surface energy materials. For example, Aditya et al.9 fabricated superhydrophobic aluminum surfaces by employing chemical etching and hexadecyltrimethoxysilane treatment, which produced a static contact angle (CA) of 162° and excellent selfcleaning. However, if unwashable contamination eventually accumulates on the surface, non-wettability will be lost. In that case, the photocatalytic effect or improved electrical conductivity can be used to recover the self-cleaning properties.10 Hence, the utilization of suitable metal oxides to construct a self-cleaning surface is considered.1
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