混凝土表面B/C3N5光催化环氧自清洁涂层去除NO性能研究

doi:10.19964/j.issn.1006-4990.2024-0598

Abstract

Abstract:

In order to solve the problem of NO accumulation in automobile exhaust gas caused by poor air circulation in the tunnel，resulting in environmental pollution，B-doping nitrogen-rich carbon nitride（B/C₃N₅） composites were prepared by evaporation solvent in-situ thermal polymerization firstly.After B doping，B—N bonds were formed by replacing C atoms instead of replacing N atoms to form B—C bonds.After B doping，the efficient separation of photogenerated carriers was achieved，and the fluorescence lifetime of photogenerated carriers was extended，showing good visible light NO removal activity.The NO removal rate reached 97.36% within 2 h of visible light irradiation.A self-cleaning emulsion was synthesized by using epoxy resin E-44 as a film-forming matrix，B/C₃N₅ composite material as an active center，and low surface energy organic fluorosilicone as a functional monomer.The emulsion was sprayed onto the surface of concrete by spraying method to form a B/CN self-cleaning coating.The coating showed good superhydrophobic and oleophobic properties，and the static water contact angle of the 1.3% B/CN coating reached 160.2°.After 7 d of UV irradiation，the static water contact angle of the coating was still higher than 150° after 30 times of sandpaper abrasion and 15 times of water-oil impact，and the coating showed good durability.The self-cleaning coating showed excellent visible light NO removal activity.After 2 h of visible light irradiation，the 1.3% B/CN coating almost completely removed NO，and the removal rate reached 99.98%.After 5 cycles of use，the NO removal activity was still higher than 96.00%，which was suitable for the degradation of harmful NO gas from automobile exhaust on the inner wall of tunnel concrete.

Key words: B-doped C₃N₅ composites, self-cleaning coating, photocatalysis, NO removal

CLC Number:

TQ128.1

HU Pingping, HE Xiaozhi. Study on NO removal performance of B/C₃N₅ photocatalytic epoxy self-cleaning coating on concrete surface[J]. Inorganic Chemicals Industry, 2025, 57(9): 117-124.

Figures/Tables 11

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References 18

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样品	比表面积/ （m²·g^-1）	孔隙体积/ （cm³·g^-1）	平均孔径/nm
C₃N₅	48.1	0.31	32.2
1.0% B/C₃N₅	41.2	0.22	39.0
1.3% B/C₃N₅	37.5	0.16	39.1
1.5% B/C₃N₅	32.3	0.13	40.2

测试项目	测试结果	测试项目	测试结果
铅笔硬度	4H	耐碱性	浸泡96 h无变化
黏结强度	1.66 MPa	耐盐性	浸泡96 h无变化
耐酸性	浸泡96 h无变化	耐水性	浸泡96 h无变化

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on NO removal performance of B/C₃N₅ photocatalytic epoxy self-cleaning coating on concrete surface

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Study on NO removal performance of B/C3N5 photocatalytic epoxy self-cleaning coating on concrete surface