Decoration of CdMoO<sub>4</sub> micron polyhedron with Pt nanoparticle and their enhanced photocatalytic performance in N<sub>2</sub> fixation and water purification

doi:10.1007/s11705-023-2360-6

Front. Chem. Sci. Eng.

2023, Vol. 17

Issue (12) : 1949-1961 https://doi.org/10.1007/s11705-023-2360-6

RESEARCH ARTICLE

Decoration of CdMoO₄ micron polyhedron with Pt nanoparticle and their enhanced photocatalytic performance in N₂ fixation and water purification

Xujie Ren¹, Junfeng Wang¹, Shude Yuan¹, Chunran Zhao¹, Lin Yue³, Zhihao Zeng³, Yiming He^1,²(

)

¹. Department of Materials Science and Engineering, Zhejiang Normal University, Jinhua 321004, China
². Key Laboratory of Solid State Optoelectronic Devices of Zhejiang Province, Zhejiang Normal University, Jinhua 321004, China
³. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China

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Abstract

This study aimed to prepare and apply a novel Pt/CdMoO₄ composite photocatalyst for photocatalytic N₂ fixation and tetracycline degradation. The Pt/CdMoO₄ composite was subjected to comprehensive investigation on the morphology, structure, optical properties, and photoelectric chemical properties. The results demonstrate the dispersion of Pt nanoparticles on the CdMoO₄ surface. Close contact between CdMoO₄ and Pt was observed, resulting in the formation of a heterojunction structure at their contact region. Density functional theory calculation and Mott-Schottky analysis revealed that Pt possesses a higher work function value than CdMoO₄, resulting in electron drift from CdMoO₄ to Pt and the formation of a Schottky barrier. The presence of this barrier increases the separation efficiency of electron-hole pairs, thereby improving the performance of the Pt/CdMoO₄ composite in photocatalysis. When exposed to simulated sunlight, the optimal Pt/CdMoO₄ catalyst displayed a photocatalytic nitrogen fixation rate of 443.7 μmol·L^‒1·g^‒1·h^‒1, which is 3.2 times higher than that of pure CdMoO₄. In addition, the composite also exhibited excellent performance in tetracycline degradation, with hole and superoxide species identified as the primary reactive species. These findings offer practical insights into designing and synthesizing efficient photocatalysts for photocatalytic nitrogen fixation and antibiotics removal.

Keywords photocatalytic N₂ fixation Pt/CdMoO₄ tetracycline degradation Schottky barrier

Corresponding Author(s): Yiming He

Online First Date: 18 October 2023 Issue Date: 30 November 2023

Cite this article:

Xujie Ren,Junfeng Wang,Shude Yuan, et al. Decoration of CdMoO₄ micron polyhedron with Pt nanoparticle and their enhanced photocatalytic performance in N₂ fixation and water purification[J]. Front. Chem. Sci. Eng., 2023, 17(12): 1949-1961.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-023-2360-6
https://academic.hep.com.cn/fcse/EN/Y2023/V17/I12/1949

Fig.1 (a) XRD patterns and (b) Raman spectra of CdMoO₄ and 0.6% Pt/CdMoO₄ samples.

Fig.2 XPS spectra of CdMoO₄ and 0.6% Pt/CdMoO₄ samples: (a) Pt 4f, (b) Cd 3d, (c) Mo 3d, and (d) O 1s.

Fig.3 (a) SEM, (b, c) TEM, and (d) EDS mapping images of 0.6% Pt/CdMoO₄ sample.

Fig.4 DRS spectra of CdMoO₄ and 0.6% Pt/CdMoO₄ samples.

Fig.5 (a) MS plots of CdMoO₄, (b) DFT calculation of Pt, and (c) band diagram of Pt/CdMoO_4.

Fig.6 (a) PC, (b) EIS profiles, (c) PL spectra, and (d) PL lifetime of CdMoO₄ and Pt/CdMoO₄ composite.

Fig.7 (a) Photocatalytic performance of CdMoO₄ and Pt/CdMoO₄ composites under simulated solar light; (b) cyclic test of 0.6% Pt/CdMoO₄ and (c) its photocatalytic behavior in different atmosphere; (d) ¹H NMR spectra (600 MHz) of the reaction solution in the presence of CdMoO₄ and Pt/CdMoO₄.

Fig.8 UV-Vis absorption spectra of TC solution during photocatalytic degradation of (a) CdMoO₄ and (b) 0.6% Pt/CdMoO₄; (c) the kinetic curve of TC content during photocatalytic degradation; (d) the cyclic reaction of 0.6% Pt/CdMoO₄ catalyst; the effect of (e) solution pH and (f) different sacrificial agents on the photocatalytic degradation performance of 0.6% Pt/CdMoO₄ for TC.

Fig.9 EPR spectra of (a) DMPO-·O₂^? and (b) TEMPO-h⁺ for 0.6%Pt/CdMoO₄ sample.

Fig.10 Possible photocatalytic mechanism for Pt/CdMoO₄ composite.

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[1]	Xiaojing Li, Chunran Zhao, Junfeng Wang, Jiayu Zhang, Ying Wu, Yiming He. Cu-doped Bi/Bi₂WO₆ catalysts for efficient N₂ fixation by photocatalysis[J]. Front. Chem. Sci. Eng., 2023, 17(10): 1412-1422.

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