铜掺杂TiO2/PCN异质结光催化还原二氧化碳性能研究

doi:10.19964/j.issn.1006-4990.2023-0310

Abstract

Abstract:

TiO₂/PCN heterojunctions（CuTiCN） with different Cu doping contents were prepared by calcination methods using CuCl₂，NH₂-MIL-125（Ti） and urea as precursors. The 3CuTiCN photocatalyst exhibited the best photocatalytic CO₂ reduction performance with CO evolution rate of 735 µmol/（g·h），which was 9 and 3 times of the PCN and TiO₂/PCN heterojunction，respectively.The composition，structure and photoelectrochemical properties of the photocatalysts were characterized by X-ray diffraction（XRD），Fourier transform infrared spectroscopy（FT-IR），scanning electron microscopy（SEM），X-ray photoelectron spectroscopy（XPS），nitrogen physical adsorption，UV-Vis-DRS spectra，PL spectra，and etc.It was found that Cu doping and construction of heterojunction enhanced the visible light absorption，increased the specific surface area and promoted the separation and transfer efficiency of photogenerated carriers.Furthermore，the band structure of the heterojunction was obtained based on the band gap data and Mott-Schottky plots，and the photocatalytic mechanism of CO₂ reduction over Cu-doped TiO₂/PCN heterojunction was proposed.

Key words: photocatalysis, CO₂ reduction, polymeric carbon nitride, Cu doping, heterojunction

CLC Number:

O643.6

ZHAO Yan, HAO Xuewei, SHI Hainan, LI Jiahui, LI Keyan, GUO Xinwen. Study on photocatalytic CO₂reduction performance of Cu-doped TiO₂/PCN heterojunction[J]. Inorganic Chemicals Industry, 2023, 55(8): 21-27.

Figures/Tables 12

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References 24

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样品	产物产率/（μmol·g^-1·h^-1）		CO选择性/%
样品	CO	H₂	CO选择性/%
PCN	83	22	79
TiCN	224	64	78
1CuTiCN	267	28	91
3CuTiCN	735	103	88
5CuTiCN	341	237	59

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Study on photocatalytic CO₂reduction performance of Cu-doped TiO₂/PCN heterojunction

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