Inorganic Chemicals Industry >
Study on degradation of organic pollutants by C3N5/Montmorillonite cement coating on concrete surface
Received date: 2024-12-13
Online published: 2025-04-27
Nitrogen-rich carbon nitride（C3N5） was loaded on the surface of montmorillonite MK30 to prepare C3N5/MK30 photocatalyst in situ.The crystal form，functional groups，elemental composition，spectral response，photoelectron-hole recombination and charge transfer resistance of the photocatalyst were characterized by X-ray diffraction（XRD），fourier transform infrared spectroscopy（FT-IR），X-ray photoelectron spectroscopy（XPS），UV-visible diffuse reflectance spectrometry（UV-vis DRS），photoluminescence spectra（PL） and electrochemical impedance spectroscopy（EIS）.The results showed that the loading of MK30 as a carrier effectively promoted the separation of C3N5 photoelectron-holes，and the charge transfer rate was improved.The efficient degradation of tetracycline（TC） solution was achieved under visible light irradiation for 60 min，and the degradation rate reached 97.15%.The recycled C3N5/MK30 photocatalyst still showed good activity.The C3N5/MK30 photocatalyst was coated on the surface of concrete in the form of cement coating，and the best photocatalytic activity was shown when the mass fraction was 6.5%.The C3N5/MK30 photocatalytic coating achieved a maximum degradation rate of 92.96% for 25 mL of TC solution with a mass concentration of 200 mg/L on the surface.The cement coating still showed a high degradation rate of 91.72% after scouring and drying by high-pressure water gun.The loading of C3N5/MK30 played a role of crystal nucleus to promote the hydration of cement and the formation of hydration products.The generated large amount of hydration products could effectively fill the pores，making the bonding between the concrete matrix and the cement coating closer.The compressive strength of concrete cured for 7 and 28 d was increased by 20.53% and 9.26%，respectively.
XU Shanshan , WANG Wenda , LI Shengyong , XU Hongmei . Study on degradation of organic pollutants by C3N5/Montmorillonite cement coating on concrete surface[J]. Inorganic Chemicals Industry, 2025 , 57(10) : 129 -138 . DOI: 10.19964/j.issn.1006-4990.2024-0675
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