Self‐Assembly of Hollow, Pompon‐Like and Nanosheet‐Structured Carbon Nitride for Photodegradation of Tetracycline Hydrochloride. (13th December 2021)

• Record Type: Journal Article
• Authors: Geng, Aixia; Lin, Hao; Zhao, Yanxi; Xu, Xuelian; Xiao, Ping; Lv, Kangle; Zhu, Junjiang
• Is Part Of: Particle and particle systems characterization. Volume 39:Number 1(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-13
• Subjects: carbon nitride -- hollow pompon‐like structures -- photocatalytic degradation -- reaction mechanisms -- tetracycline hydrochloride; Particles -- Periodicals; 620.43
• DOI: 10.1002/ppsc.202100235
• Languages: English
• ISSNs: 0934-0866

Abstract

Abstract: A hollow pompon‐like carbon nitride (hp‐CN), composed of nanosheets, is prepared and used for photocatalytic degradation of tetracycline hydrochloride (TC). The synthesis is done by a supramolecular self‐assembly method, using melamine and cyanuric acid as precursors. The hollow pompon‐like morphology and nanosheet structure promote both the textural (e.g., crystallinity, surface area) and electronic properties (e.g., electron–hole separation efficiency, number of excited electrons, and impedance) of hp‐CN, compared to these of graphitic carbon nitride (g‐CN) synthesized by direct polycondensation of melamine. The hp‐CN‐6 (heating for 6 h) is highly active for photodegradation of TC, with 96.3% conversion obtained within 15 min when conducted at pH 1.86, and no appreciable activity loss is detected within 4 cycles. Quenching experiments suggest that superoxide radicals (O2 − ) are the primary active reaction species. A comparison in the activity of hp‐CN‐6 and g‐CN for photocatalytic TC degradation is made, and a possible mechanism is proposed. Abstract : A hollow pompon‐like carbon nitride (hp‐CN) composed of nanosheets is prepared by a supramolecular self‐assembly method, which shows improved textural and electronic properties, and photocatalytic activity for degradation of tetracycline hydrochloride reaction, compared to these materials reported in the literature. A mechanism for the reaction is proposed, showing that superoxide radicals are the major active species.