MoS2/g-C3N4复合材料负载光催化混凝土的制备及其活性研究

doi:10.19964/j.issn.1006-4990.2024-0378

Abstract

Abstract:

MoS₂/g-C₃N₄ composites were prepared by solvothermal method using MoS₂ and g-C₃N₄ as precursors.X-ray diffraction（XRD），N₂ adsorption-desorption（BET），UV-vis diffuse reflectance spectroscopy（UV-vis DRS），steady-state fluorescence spectroscopy（PL），transient photocurrent spectroscopy（TPC） and electrochemical impedance spectroscopy（EIS） were used to characterize the phase crystal form，specific surface area and pore size，spectral response range and intensity，photogenerated carrier recombination，visible light absorption and conversion ability and charge transfer resistance of MoS₂/g-C₃N₄ composites.MoS₂/g-C₃N₄ composite loaded photocatalytic concrete was prepared by cement coating method and applied to the removal of nitrogen oxides（NO _x ）.The results showed that the construction of heterojunction between MoS₂ and g-C₃N₄ broadened the spectral absorption range，improved the visible light absorption and conversion ability，realized efficient photogenerated carrier separation，and reduced the surface/interface resistance，which was conducive to the improvement of photocatalytic performance.The MoS₂/g-C₃N₄ composite loaded photocatalytic concrete showed excellent visible light removal NO _x activity and stability.The initial NO _x concentration of 200 mg/L，visible light irradiation for 180 min，MoS₂/g-C₃N₄ composite loading of 4% photocatalytic concrete showed the best NO _x removal activity，NO _x removal rate reached 84.63%，and the NO _x removal rate was only reduced by 2.85% after 10 cycles.The load of MoS₂/g-C₃N₄ composite blocked the partially fully connected and semi-connected pores of concrete，and the combination between aggregate and cement was closer，which reduced the water permeability of concrete and improved the compressive strength of concrete，showing good freeze-thaw resistance.

Key words: MoS₂/g-C₃N₄ composites, concrete, visible light photocatalysis, nitrogen oxides

CLC Number:

TQ136.12

LIN Shashan, WANG Xiazhong. Study on preparation of MoS₂/g-C₃N₄ composite loaded photocatalytic concrete and its activity[J]. Inorganic Chemicals Industry, 2025, 57(6): 123-132.

Figures/Tables 15

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Study on preparation of MoS₂/g-C₃N₄ composite loaded photocatalytic concrete and its activity

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Study on preparation of MoS2/g-C3N4 composite loaded photocatalytic concrete and its activity