Preparation of flower-like cadmium-doped ZnO and its photocatalytic degradation of tetracycline hydrochloride

doi:10.19965/j.cnki.iwt.2022-0842

Abstract

Key words: zinc oxide, cadmium?doped, photocatalytic, tetracycline hydrochloride

CLC Number:

X703.1

Huabing ZHANG, Yan DU, Houxiang SUN. Preparation of flower-like cadmium-doped ZnO and its photocatalytic degradation of tetracycline hydrochloride[J]. Industrial Water Treatment, 2023, 43(7): 120-127.

张化冰, 杜焱, 孙厚祥. 花状镉掺杂ZnO的制备及其光催化降解盐酸四环素的研究[J]. 工业水处理, 2023, 43(7): 120-127.

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https://www.iwt.cn/EN/Y2023/V43/I7/120

Figures/Tables 13

Fig.1 XRD patterns of ZnO and Cd-ZnO

Fig. 2 SEM images of ZnO and Cd-ZnO

Fig.3 XPS spectra of ZnO and Cd_0.5ZnO

Fig. 4 UV-vis DRS spectra of ZnO and Cd_0.5ZnO

Fig.5 Electrochemical impedance spectroscopy （a） and photocurrent response （b） of ZnO and Cd-ZnO

Fig. 6 Effect of Cd doping amount on the photocatalytic degradation efficiency of TC by Cd-ZnO

Fig. 7 Effect of initial mass concentration of TC on the photocatalytic degradation efficiency of TC by Cd_0.5ZnO

Fig. 8 Effect of initial pH of solution on the photocatalytic degradation efficiency of TC by Cd_0.5ZnO

Fig. 9 Effect of Cd_0.5ZnO dosage on the photocatalytic degradation efficiency of TC by Cd_0.5ZnO

Fig.10 Quasi first-order kinetics （a） and quasi second-order kinetics fitting curves （b） of TC photocatalytic degradation by catalysts

Table 1 Dynamic fitting parameters

催化剂	TC去除率/%	准一级动力学		准二级动力学
催化剂	TC去除率/%	R ₁ ²	k ₁/min^-1	R ₂ ²	k ₂/（L·mol^-1·min^-1）
ZnO	72.5	0.961	0.006 83	0.975	0.017 8
Cd_0.5ZnO	85.3	0.818	0.009 50	0.927	0.036 5
Cd_1.0ZnO	80.3	0.785	0.007 97	0.893	0.024 2
Cd_1.5ZnO	76.1	0.895	0.007 51	0.925	0.019 6
Cd_2.0ZnO	77.8	0.975	0.009 12	0.964	0.024 3

Fig. 11 Effect of different scavengers on TC degradation by Cd_0.5ZnO

Fig.12 Cd_0.5ZnO stability in cycle experiment

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