The Preparation of g-C3N4/CoAl-LDH Nanocomposites and Their Depollution Performances in Cement Mortars under UV-Visible Light

• Published in: Catalysts Vol. 12; no. 4; p. 443
• Main Authors: Huang, Mengya, Yang, Zhengxian, Lu, Lin, Xu, Jiankun, Wang, Wencheng, Yang, Can
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 15.04.2022
• Subjects: Abrasion resistant coatings; Air pollution; Carbon nitride; Catalysts; Cement hydration; cementitious composites; Chemical reactions; Coal; Degradation; Efficiency; Fourier transforms; g-C3N4/CoAl-LDH; heterostructure; Investigations; laboratory-simulated wearing and abrasion; Light; Light irradiation; Morphology; Mortars (material); Nanocomposites; Photocatalysis; photocatalytic depollution; Pollutants; Scanning electron microscopy; Semiconductors; Spectrum analysis; Spraying; Substrates; Wear resistance
• ISSN: 2073-4344; 2073-4344
• DOI: 10.3390/catal12040443

In this study, new organic-inorganic g-C3N4/CoAl-LDH nanocomposites were prepared and introduced to fabricate photocatalytic cement mortars by internal mixing, coating, and spraying. The photocatalytic depollution of both g-C3N4/CoAl-LDH and cement mortars was assessed by NOx degradation reaction under UV-visible light irradiation. The study results suggested that the degradation efficiency of g-C3N4/CoAl-LDH nanocomposites improved with an increase in g-C3N4 content. The g-C3N4/CoAl-LDH1.5 nanocomposite displayed the highest NOx degradation capacity, which was about 1.23 and 3.21 times that of pure g-C3N4 and CoAl-LDH, respectively. The photocatalytic cement mortars which were all fabricated using different approaches could effectively degrade the target pollutants and exhibited significant compatibility between g-C3N4/CoAl-LDH and cementitious substrate. Among them, the coated mortars showed strong resistance to laboratory-simulated wearing and abrasion with a small decrease in degradation rate.