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Oxidized graphitic carbon nitride nanosheets as an effective adsorbent for organic dyes and tetracycline for water remediation

Yousefi, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jallcom.2019.151783
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. Graphitic carbon nitride (g-C3N4) is promising as adsorbent for water remediation as its chemical structure allows a variety of mechanisms to interact with wastewater pollutants. However, several issues, such as low specific surface area and insufficient dispersibility in water, have to be tackled to achieve a competitive performance in such use. Previous attempts to improve the features of g-C3N4as an adsorbent have relied on carbon doping and exfoliation in the solid phase by thermal expansion. Here, we demonstrate that exfoliation in the liquid phase by a combination of oxidation and sonication allows preparing g–C3N4–based materials with improved dispersibility in water, increased exposed surface, and abundance of surface functional groups. The obtained oxidized g-C3N4 adsorbents exhibited high adsorption capacities which were remarkable towards organic dyes (∼70–600 mg/g) and excellent in the case of the antibiotic tetracycline (895 mg/g) in aqueous solution. The present results should open new opportunities for the use of oxidized g-C3N4 materials as adsorbents for water remediation. © 2019 Elsevier B.V
  6. Keywords:
  7. Electron emission spectroscopy ; SEM ; Carbon nitride ; Electron emission ; Emission spectroscopy ; Exfoliation (materials science) ; Nanostructured materials ; Nitrides ; Scanning electron microscopy ; Thermal expansion ; Water pollution ; Competitive performance ; Dispersibilities ; Exposed surfaces ; Graphitic carbon nitrides ; High adsorption capacity ; Surface functional groups ; Wastewater pollutants ; Water remediation ; Oxidation
  8. Source: Journal of Alloys and Compounds ; Volume 809 , 2019 ; 09258388 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0925838819330166