A green and facile method to prepare graphitic carbon nitride nanosheets with outstanding photocatalytic H2O2 production ability via NaClO hydrothermal treatment. (19th October 2018)

• Record Type: Journal Article
• Authors: Wang, Hui; Fang, Lei; Hu, Shaozheng; Pei, Yanbo; Ma, Wentao
• Is Part Of: New journal of chemistry. Volume 42:Number 22(2018)
• Page Start: 18335
• Page End: 18341
• Publication Date: 2018-10-19
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj03044h
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Transportation and transformation of photogenerated carriers during the photocatalytic process of graphitic carbon nitride (g-C3 N4 ) are restricted by the low surface area and insufficient charge separation efficiency. Abstract : Transportation and transformation of photogenerated carriers during the photocatalytic process of graphitic carbon nitride (g-C3 N4 ) are restricted by the low surface area and insufficient charge separation efficiency. Exfoliation of g-C3 N4 into few layered nanosheets is an ideal method to resolve these problems. This work provides a green and facile method to prepare g-C3 N4 nanosheets with outstanding photocatalytic H2 O2 production ability via NaClO hydrothermal treatment. This simple process could readily be extended to a kilogram scale. XRD, UV-vis, N2 adsorption, SEM, TEM, XPS, O2 -TPD, EIS and PL were used to characterize the catalysts. Taking advantages of both the oxidation effect of ClO − and the intercalation effect of Na +, the obtained g-C3 N4 nanosheets display a specific surface area as high as 145.6 m 2 g −1 . The carbon vacancies formed by NaClO treatment could promote the O2 adsorption capacity of the catalyst and then activate the adsorbed O2 molecule. The charge separation efficiency and redox ability of g-C3 N4 nanosheets are also promoted compared with bulk g-C3 N4, leading to the obviously improved H2 O2 production ability. In addition, the obtained g-C3 N4 nanosheets show higher photocatalytic performance than that prepared by chemical oxidation exfoliation, thermal exfoliation and intercalation exfoliation methods. This confirms that NaClO hydrothermal treatment is a more green, facile and effective method to prepare g-C3 N4 nanosheet photocatalysts with outstanding performance.