Construction of ZnO/CdS/Ag Composite Photocatalyst and Its Catalytic and Antibacterial Performance

doi:10.11901/1005.3093.2021.586

Chinese Journal of Materials Research

2023, Vol. 37

Issue (1): 10-20 DOI: 10.11901/1005.3093.2021.586

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Construction of ZnO/CdS/Ag Composite Photocatalyst and Its Catalytic and Antibacterial Performance

XIE Feng¹, GUO Jianfeng¹, WANG Haitao², CHANG Na¹(

)

^1.School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, China
^2.School of Environmental Science and Technology, Tianjin 300387, China

Cite this article:

XIE Feng, GUO Jianfeng, WANG Haitao, CHANG Na. Construction of ZnO/CdS/Ag Composite Photocatalyst and Its Catalytic and Antibacterial Performance. Chinese Journal of Materials Research, 2023, 37(1): 10-20.

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Abstract

Firstly, hexagonal crystalline CdS multilayer flower-like microspheres were synthesized by hydrothermal reaction, next on the surface of which ZnO nanorods were grown on to form uniform ZnO/CdS composite, and thirdly ZnO/CdS/Ag ternary semiconductor photocatalyst was prepared by depositing Ag nanoparticles onto ZnO nanorods by photoreduction method. The prepared ZnO/CdS/Ag photocatalyst was characterized by scanning electron microscope and transmission electron microscope, while its photoelectric property, active group capture characteristics, photocatalytic degradability for methylene blue (MB) and antibacterial property were also examined. The results show that ZnO nanorods uniformly grow on the surface of CdS microspheres, and Ag nanoparticles were deposited on the surface of ZnO nanorods. ZnO/CdS/Ag ternary photocatalyst has good visible light response, low impedance and high photocurrent density. ZnO/CdS/Ag composite photocatalyst can simultaneously produce hydroxyl and superoxide radicals and other reactive oxygen groups. The degradation rate of methylene blue (MB) on ZnO/CdS/Ag ternary photocatalyst in 30 min is higher than 90%. The sterilization rate of 0.25 mg/mL ZnO/CdS/Ag to Gram-negative bacteria (Escherichia coli) is higher than 96%, and gram-positive bacteria (Staphylococcus aureus) can be completely destroyed.

Key words: inorganic non-metallic materials photocatalysis zinc oxide nanorod antibacterial property

Received: 13 October 2021

ZTFLH:

X703.1

Fund: National Key R & D Program of China(2019YFC0408400)

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	Feng XIE
	Jianfeng GUO
	Haitao WANG
	Na CHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.586 OR https://www.cjmr.org/EN/Y2023/V37/I1/10

Fig.1 Schematic diagram for the preparation of ZnO/CdS/Ag

Fig.2 XRD patterns of CdS, ZnO and ZnO/CdS/Ag

Fig.3 The XPS spectra of ZnO/CdS/Ag

Fig.4 SEM images of CdS (a), ZnO (b), ZnO/CdS (c) and ZnO/CdS/Ag (d)

Fig.5 TEM images of ZnO/CdS (a), ZnO/CdS/Ag (b)

Fig.6 Elemental distribution of ZnO/CdS/Ag: total element diagram (a), Zn (b), O (c), Cd (d), S (e), Ag (f) and EDS elemental composition diagram of ZnO/CdS/Ag catalyst (g)

Fig.7 The UV-Vis absorption spectra (a), photoluminescence spectra (b), electrochemical impedance diagram (c) and transient photocurrent response diagram (d) of ZnO, CdS, ZnO/CdS, ZnO/CdS/Ag

Fig.8 The photocatalytic degradation curves (a) and kinetic fitting curves (b) of ZnO, CdS, ZnO/CdS, ZnO/CdS/Ag of methylene blue; comparison of the photocatalytic efficiency between ZnO/CdS/Ag photocatalyst and photocatalysts reported in other references in the comparison chart (c); trapping experiment of the photocatalytic reactive species based on ZnO/CdS/Ag photocatalyst (d)

Fig.9 Antibacterial activity of 0.25 mg/mL ZnO/CdS/Ag against escherichia coli (blank a1, dark conditions a2, light conditions a3) and staphylococcus aureus (blank b1, dark conditions b2, light conditions b3)

Fig.10 Antibacterial activity of 0.5 mg/mL ZnO/CdS/Ag against escherichia coli (dark conditions a1, light conditions a2) and staphylococcus aureus (dark conditions b1, light conditions b2)

Fig.11 Mott-Schottky curves (a) and the photocatalytic reaction mechanism diagram (b)

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