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Study on NO x degradation performance of concrete-based non-metallic boron doped nitrogen-rich carbon nitride
Received date: 2024-05-30
Online published: 2024-07-03
In order to solve the pollution caused by nitrogen oxides（NO x ） to the environment， non-metallic boron-doped nitrogen-rich carbon nitride（B/C3N5） photocatalytic materials were prepared by evaporation solvent-high temperature thermal polymerization.The phase，characteristic functional groups，elemental composition，spectral absorption range and photoelectron-hole recombination of B/C3N5 photocatalytic materials were characterized by X-ray diffraction（XRD），Fourier transform infrared spectroscopy（FT-IR），X-ray photoelectron spectroscopy（XPS），ultraviolet-visible diffuse reflectance spectroscopy（UV-vis DRS），steady-state fluorescence spectroscopy（PL） and electrochemical impedance spectroscopy（EIS）.B/C3N5 photocatalytic material（CBCN） was loaded on concrete as a carrier for photocatalytic degradation of NO x .The results showed that the doping of non-metallic B broadened the spectral absorption range，realized efficient photo-generated carrier separation，reduced the charge mass transfer resistance，and improved the photocatalytic performance.B/C3N5 showed significantly better photocatalytic degradation of NO x than pure C3N5，and had good stability.The non-metallic B-doped 3%（mass fraction） B/C3N5 photocatalytic material showed the most excellent NO x degradation activity.The highest degradation rate of NO x reached 93.98%，and the degradation rate of NO x still reached 92.94% after 5 cycles.Within 120 min of simulated sunlight irradiation，the highest photocatalytic degradation rates of NO x by CBCN with curing cycles of 7 d and 28 d reached 77.22% and 84.27%，respectively.When the doping amount of B/C3N5 photocatalytic material was 6%（mass fraction），the compressive strength of CBCN with curing period of 7 d and 28 d was the highest，which was 8.29 and 13.96 MPa，respectively.The doping of B/C3N5 photocatalytic material effectively improved the compressive strength of concrete.
Key words： B/C3N5; concrete; photocatalysis; nitrogen oxides; compressive strength
SHI Wangfang , ZHANG Yongsheng . Study on NO x degradation performance of concrete-based non-metallic boron doped nitrogen-rich carbon nitride[J]. Inorganic Chemicals Industry, 2025 , 57(3) : 116 -123 . DOI: 10.19964/j.issn.1006-4990.2024-0305
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