Carbon nitrides modified with suitable electron withdrawing groups enhancing the visible-light-driven photocatalytic activity for degradation of the Rhodamine B
- College of science, China Agricultural University, Beijing, 100193 (China)
Highlights: • Different acid anhydrides all improve the photocatalytic activity of modified g-C{sub 3}N{sub 4}. • PMDA is the more satisfactory acid anhydride. • The photocatalytic and photosensitized paths both exist in the degradation of Rh B. • The PMDA introduction can improve the generated capability of • O{sub 2}{sup −} on the PCN. - Abstract: Carbon nitrides (CN) were modified with acid anhydrides to improve the separation efficiency of the electron-hole and pyromellitic dianhydride (PMDA), was screened as the most suitable groups introduced into the CN. The factors including preparation condition factors, the degree of the CN polymerization and degradation condition factors were researched. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and the infrared spectra (IR) show the structural changes and confirm the successful introduction of PMDA to the bulk CN. The optical properties of modified photocatalyst are investigated by UV–vis diffused reflection spectra (UV–vis DRS) and photoluminescence (PL) spectra and the adsorption performance is detected by the Brunauer-Emmett-Teller (BET). Moreover, the concentration of the main active species O{sub 2}{sup −} increased evidently after the modification during the degradation process. Compared with CN, the photocatalytic degradation efficiency of PCN-290 is about 2 times of that under visible irradiation (λ > 400 nm).
- OSTI ID:
- 22805238
- Journal Information:
- Materials Research Bulletin, Vol. 106; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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