Construction of defect-containing UiO-66/MoSe<sub>2</sub> heterojunctions with superior photocatalytic performance for wastewater treatment and mechanism insight

doi:10.1007/s11705-022-2226-3

Front. Chem. Sci. Eng.

2023, Vol. 17

Issue (4) : 449-459 https://doi.org/10.1007/s11705-022-2226-3

RESEARCH ARTICLE

Construction of defect-containing UiO-66/MoSe₂ heterojunctions with superior photocatalytic performance for wastewater treatment and mechanism insight

Xiao Han^1,², Xiaoxuan Wang^1,², Jiafang Wang^1,², Yingjie Xie^1,², Cuiwei Du^1,², Chongfei Yu^1,², Jinglan Feng^1,², Jianhui Sun^1,²(

), Shuying Dong^1,²(

)

¹. School of Environment, Henan Normal University, Xinxiang 453007, China
². Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Xinxiang 453007, China

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Abstract

Metal–organic frameworks are recognized as promising multifunctional materials, especially metal–organic framework-based photocatalysts, which are considered to be ideal photocatalytic materials. Herein, a new type of UiO-66/MoSe₂ composite was prepared using the solvothermal method. The optimum composite was selected by adjusting the mass ratio of UiO-66 and MoSe₂. X-ray diffraction analysis showed that the mass ratio influenced the crystal plane exposure rate of the composite, which may have affected its photocatalytic performance. The composite is composed of ultra-thin flower-like MoSe₂ that wrapped around cubic UiO-66, a structure that increases the abundance of active sites for reactions and is more conducive to the separation of carriers. The photocatalytic properties of the composite were evaluated by measuring the degradation rate of Rhodamine B and the catalyst’s ability to reduce Cr(VI)-containing wastewater under visible light irradiation. Rhodamine B was decolorized completely in 120 min, and most of the Cr(VI) was reduced within 150 min. The photochemical mechanism of the complex was studied in detail. The existence of Mo⁶⁺ and oxygen vacancies, in addition to the Z-type heterojunction promote the separation of electrons and holes, which enhances the photocatalytic effect.

Keywords UiO-66/MoSe₂ photocatalysis dye-containing wastewater heavy metal wastewater oxygen vacancies

Corresponding Author(s): Jianhui Sun,Shuying Dong

Online First Date: 10 January 2023 Issue Date: 24 March 2023

Cite this article:

Xiao Han,Xiaoxuan Wang,Jiafang Wang, et al. Construction of defect-containing UiO-66/MoSe₂ heterojunctions with superior photocatalytic performance for wastewater treatment and mechanism insight[J]. Front. Chem. Sci. Eng., 2023, 17(4): 449-459.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2226-3
https://academic.hep.com.cn/fcse/EN/Y2023/V17/I4/449

Scheme1 Schematic illustrating the synthesis of UiO-66/MoSe₂.

Fig.1 XRD patterns of (a) UiO-66, (b) MoSe₂, (c) composites, and (d) detail patterns of ZM-24 and ZM-25.

Fig.2 TEM micrographs of (a) UiO-66, (b) MoSe₂, (c) ZM-23, and (d) the lattice fringes of ZM-23.

Fig.3 (a) UV–vis diffuse reflectance spectra and the relationship between (Ahν)^1/2 and (b) the photon energy hν of UiO-66 and MoSe₂.

Fig.4 Full spectrum of (a) the prepared catalyst, and high-resolution XPS spectra of (b) Zr 3d, (c) C 1s, (d) Se 3d, (e, f) Mo 3d.

Tab.1 Comparison of the nitrogen adsorption characteristics of UiO-66, MoSe₂, and ZM-23

Fig.5 (a) Nitrogen adsorption?desorption isotherms and (b) the corresponding pore size distribution curves of the as-synthesized UiO-66, MoSe₂ and ZM-23 photocatalysts.

Fig.6 (a) Nyquist plots of the electrochemical impedance spectra and (b) photocurrent response of UiO-66, MoSe₂ and ZM-23 photocatalysts.

Fig.7 (a) Degradation efficiencies of RhB by prepared photocatalysts under simulated sunlight irradiation and (b) ln(C₀/C) versus time for RhB under simulated sunlight irradiation.

Fig.8 (a) Reduction performance for a Cr(VI) solution under simulated sunlight irradiation and (b) ln(C₀/C) versus time for Cr(VI) under simulated sunlight irradiation.

Fig.9 (a) Cyclic degradation of RhB using ZM-23 and (b) the photocatalytic degradation of an RhB solution using ZM-23 with and without quenchers under simulated sunlight irradiation.

Fig.10 ESR spin-trapping (a) h⁺ and (b) ·O₂^– radicals.

Scheme2 Photocatalytic mechanism of (a) UiO-66 and MoSe₂ forming a traditional type II heterojunction and (b) Z-scheme heterojunction.

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