Nitrogen-deficient g-C3Nx/POMs porous nanosheets with P–N heterojunctions capable of the efficient photocatalytic degradation of ciprofloxacin. (November 2020)

• Record Type: Journal Article
• Authors: He, Ren; Xue, Kehui; Wang, Jing; Yan, Ying; Peng, Yi; Yang, Tianli; Hu, Yunchu; Wang, Wenlei
• Is Part Of: Chemosphere. Volume 259(2020)
• Publication Date: 2020-11
• Subjects: Nitrogen-deficient g-C3Nx -- POMs -- P–N heterojunctions -- Ciprofloxacin -- Adsorption -- Photo-catalysis; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.127465
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The direct shedding of piperazine rings is critical for the degradation of antibiotic persistent organic pollutants. In this work, nitrogen-deficient g-C3 N4 loaded with polyoxometalates porous photocatalysts with P–N heterojunctions were carried out through the formation of chemical bonds between the nitrogen-deficient C + in g-C3 Nx and the bridging oxygen in polyoxometalates (POMs), including phosphomolybdic acid (PMA), phosphotungstic acid (PTA) and silicotungstic acid (STA). The adsorption and photocatalysis experiments confirm the ability of the g-C3 Nx /POMs nanosheets to efficiently remove ciprofloxacin via the synergistic effects of adsorption and photo-catalysis. Approximately, g-C3 Nx /POMs-30 exhibits the optimal degradation ability, and the degradation rates of g-C3 Nx /PMA-30, g-C3 Nx /PTA-30 and g-C3 Nx /STA-30 could respectively reach 93.1%, 97.4% and 95.6% within only 5 min under visible light. The free radical scavenging experiment and ESR free radical capture experiments confirm that ·OH and ·O2 − are free radicals that effectively degrade CIP. According to the results of the LC-MS analysis, the intermediates produced after CIP degradation and the efficient degradation pathway are proposed. The direct shedding of piperazine rings in the decarboxylation and defluorination process leads to the most efficient degradation of CIP into the small molecules. Graphical abstract: Image 1 Highlights: Nitrogen-deficient g-C3 Nx was prepared using one step of magnesium thermal denitrification. A 3D porous superimposed structure formed after doped with PMA, PTA and STA. Interactions of POMs with g-C3 Nx resulted in the formation of strong P–N heterojunctions. Doping of W and Mo atoms substantially increased the light-harvesting properties. The direct shedding of piperazine ring led to the efficient degradation of CIP within 5 min.