NH2-MIL-125（Ti）/C3N5复合材料的制备及光热催化还原CO2性能

doi:10.3969/j.issn.2097-2806.2025.09.004

Abstract

Abstract:

Photocatalytic reduction of CO₂ to hydrocarbon fuel is of great significance to alleviate the energy crisis and greenhouse effect. However, the recombination of photoelectron-holes greatly limits the catalytic activity of single-component material. In order to solve this problem, a S scheme nitrogen-rich carbon nitride （C₃N₅） supported metal-organic framework NH₂-MIL-125（Ti）[NH₂-MIL-125（Ti）/C₃N₅] heterojunction composite material was constructed by solvothermal method. The crystal phase, elemental composition, microstructure, spectral absorption and photoelectron-hole recombination of the composite material were characterized by XRD, XPS, SEM, TEM, UV-vis DRS and PL. The activity and stability of the composites for photothermal catalytic reduction of CO₂ were evaluated, and the mechanism of photothermal catalytic reduction of CO₂ was discussed. The results show that NH₂-MIL-125（Ti）/C₃N₅ exhibits significantly enhanced photothermal composite material reduction of CO₂ activity compared to the single component composite material. The yields of CH₃OH and CO are 3.33 and 0.34 μmol/ （g·h）, respectively. The significantly improved photothermal composite material reduction of CO₂ activity is due to the high specific surface area of the composite material up to 674.916 m²/g and efficient photoelectron-hole separation efficiency. The construction of S scheme heterojunction between NH₂-MIL-125（Ti） and C₃N₅ is proved by the change of binding energy position of in-situ XPS and ordinary XPS spectra. The charge ias transferred from NH₂-MIL-125（Ti） to C₃N₅, and the bending energy band and built-in electric field realize the efficient separation of photoelectron-holes. The electrons and holes with high reduction and oxidation activity are retained in the conduction band of C₃N₅ and the valence band of NH₂-MIL-125（Ti）. Under the action of electron and thermal effects, CO₂ is reduced to CH₃OH and a small amount of CO is generated.

Key words: NH₂-MIL-125（Ti）, nitrogen-rich carbon nitride, S scheme heterojunction, photothermal catalysis, CO₂ reduction, composite material

CLC Number:

O644.1

Hongdan Hu, Xin Zhao. Preparation of NH₂-MIL-125 (Ti)/C₃N₅ composite and its photothermal catalytic reduction of CO₂ performance[J].China Surfactant Detergent & Cosmetics, 2025, 55(9): 1112-1119.

Figures/Tables 10

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Sample	S_BET/ （m²/g）	Pore size/nm	Pore volume/（cm³/g）
C₃N₅	19.436	6.425	0.203
NH₂-MIL-125（Ti）	453.354	3.599	0.522
NH₂-MIL-125（Ti）/C₃N₅	674.916	8.332	0.731

Preparation of NH₂-MIL-125 (Ti)/C₃N₅ composite and its photothermal catalytic reduction of CO₂ performance

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Preparation of NH2-MIL-125 (Ti)/C3N5 composite and its photothermal catalytic reduction of CO2 performance

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Preparation of NH₂-MIL-125 (Ti)/C₃N₅ composite and its photothermal catalytic reduction of CO₂ performance