Excellent Ultraviolet Photocatalytic Efficiency of Mg 2+ Doped ZnO and Analysis on Its Synergetic Effect †

doi:10.7503/cjcu20190467

Abstract

Abstract:

A series of Mg-doped ZnO samples were synthesized via a facile chemical precipitation method. Mg ²⁺ was effectively doped into the lattice of ZnO and MgO particles formed on the surface of ZnO when the Mg doping content exceeded 5%. Under the combined action of Mg ²⁺ and MgO insulators, the degradation rate of RhB over 10%Mg-ZnO photocatalyst was 81.3% in 5 min under ultraviolet light and the degradation rate constant was 0.3271 min ^-1, which was 3.42 times that of pure ZnO(0.0957 min ^-1). The transient photovoltage(TPV) and the contact potential difference(ΔCPD) measurements directly demonstrated that the incorporation of Mg ²⁺ decreased the work function of ZnO and increased the number of electrons in the conduction band, thus the separation efficiency of photogenerated electrons and holes can be improved. The surface photocurrent(SPC) and the Cr(Ⅵ) reduction experiments showed that the formation of MgO insulating particles inhibited the “reverse” transmission of photogenerated electrons in ZnO, which prolonged the recombination time of electrons and holes, thus indirectly improved the utilization of photogenerated holes. This work provides a new idea for the design of highly efficient photocatalytic materials.

Key words: Mg doped ZnO, Photocatalysis, Synergetic effect, Photogenerated charges behavior

CLC Number:

O643

TrendMD:

ZHAO Peng,ZHANG Jinteng,LIN Yanhong. Excellent Ultraviolet Photocatalytic Efficiency of Mg ²⁺ Doped ZnO and Analysis on Its Synergetic Effect ^†[J]. Chem. J. Chinese Universities, 2020, 41(3): 538.

Figures/Tables 14

Fig.1 XRD patterns for pure ZnO and Mg-ZnO composites

Sample	Crystallite size/nm	a/nm	c/nm	c/a ratio
ZnO	22.0	0.32432	0.52001	1.6034
1%Mg-ZnO	20.5	0.32397	0.51973	1.6043
3%Mg-ZnO	19.6	0.32509	0.52047	1.6010
5%Mg-ZnO	19.3	0.32569	0.52135	1.6007
10%Mg-ZnO	19.3	0.32584	0.52109	1.5992
20%Mg-ZnO	21.6	0.32573	0.52093	1.5993

Fig.2 FESEM images of pure ZnO(A), 1%Mg-ZnO(B), 3%Mg-ZnO(C), 5%Mg-ZnO(D), 10%Mg-ZnO(E) and 20%Mg-ZnO(F)

Fig.3 TEM(A) and HRTEM(B) images of 10%Mg-ZnO composite

Fig.4 Survey XPS spectra(A) and high-resolution XPS spectra of Zn2p(B), O1s(C), Mg1s(D) of 10%Mg-ZnO composites

Fig.5 N2 adsorption-desorption isotherms of ZnO(A) and 10%Mg-ZnO(B)

Fig.6 UV-Vis DRS spectra(A) and (αhν)1/2-hν plots of the as-prepared photocatalysts(B)

Fig.7 ΔCPD values of ZnO and 10%Mg-ZnO composites samples

Fig.8 TPV plots of pure ZnO and 10%Mg-ZnO composites samples

Fig.9 SPC plots of ZnO and different molar ratio of Mg-ZnO samples

Fig.10 RhB decolorization curves over different catalysts under UV lamp irradiation(A), first-order kinetic fitting for the degradation of RhB over different catalysts(B) and UV-Vis spectra of 20 mg/L RhB over pure ZnO(C) and 10%Mg-ZnO(D)

Fig.11 Effect of different scavengers on the photode-gradation efficiency of RhB under UV light

Fig.12 Results of Cr(Ⅵ) reduction in the presence of pure ZnO and 10%Mg-ZnO

Fig.13 Photogenerated charge separation and transport mechanism of Mg-ZnO under ultraviolet light

References 47

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Excellent Ultraviolet Photocatalytic Efficiency of Mg ²⁺ Doped ZnO and Analysis on Its Synergetic Effect ^†

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