聚合氮化碳的制备、改性及光催化还原二氧化碳性能研究

doi:10.19964/j.issn.1006-4990.2021-0614

Abstract

Abstract:

The greenhouse effect caused by excessive carbon dioxide（CO₂） emissions makes global warming increasingly ur-gent,under the background of “double carbon”,how to utilize CO₂ is of particular importance.The photocatalytic reduction of CO₂ to produce chemicals and fuels is a promising way to solve both energy crisis and environmental problems.Non-metal semiconductor,polymeric carbon nitride（PCN） has attracted much attention in the field of photocatalysis due to its visible light response,high chemical stability,easy preparation and low cost.However,PCN prepared by the traditional thermal polymerization method suffers from small specific surface area,serious electron-hole recombination as well as limited visible light response range.The reaction mechanism of CO₂ photoreduction and the structure of PCN were introduced.The preparation methods of PCN and the modification methods for improved photocatalytic performance were summarized,including morpho-logy control,heteroatom doping,defect engineering and heterojunction construction.Finally,the problems existing in the research of PCN materials in CO₂ photoreduction were analyzed,and the future development direction was prospected.

Key words: photocatalysis, carbon dioxide reduction, polymeric carbon nitride, modification

CLC Number:

O643.32

LI Jiahui,LI Keyan,SONG Chunshan,GUO Xinwen. Study on preparation,modification and carbon dioxide photocatalytic reduction performance of polymeric carbon nitride[J]. Inorganic Chemicals Industry, 2021, 53(12): 21-28.

Figures/Tables 7

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References 66

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还原半反应	标准电势/V（相对于标准氢电极,pH=0）
CO₂（g）+e^-→CO₂^-	-1.90
CO₂（g）+2H⁺+2e^-→HCO₂H（l）	-0.20
CO₂（g）+2H⁺+2e^-→CO（g）+H₂O（l）	-0.12
2H⁺+2e^-→H₂（g）	0.00
CO₂（g）+6H⁺+6e^-→CH₃OH（l）+H₂O（l）	0.03
CO₂（g）+4H⁺+4e^-→HCHO（l）+H₂O（l）	0.07
2CO₂（g）+9H₂O（l）+12e^-→C₂H₅OH（l）+12OH^-	0.08
3CO₂（g）+13H₂O（l）+18e^-→C₃H₇OH（l）+18OH^-	0.09
CO₂（g）+8H⁺+8e^-→CH₄（g）+2H₂O（l）	0.17

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Study on preparation,modification and carbon dioxide photocatalytic reduction performance of polymeric carbon nitride

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