Volume 8 Issue 2
May  2023
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Article Navigation >  Journal of Bioresources and Bioproducts  > 2023  >  8(2): 162-175
Hesam Salimi Shahraki, Rani Bushra, Nimra Shakeel, Anees Ahmad, Quratulen, Mehraj Ahmad, Christos Ritzoulis. Papaya peel waste carbon dots/reduced graphene oxide nanocomposite: From photocatalytic decomposition of methylene blue to antimicrobial activity[J]. Journal of Bioresources and Bioproducts, 2023, 8(2): 162-175. doi: 10.1016/j.jobab.2023.01.009
Citation: Hesam Salimi Shahraki, Rani Bushra, Nimra Shakeel, Anees Ahmad, Quratulen, Mehraj Ahmad, Christos Ritzoulis. Papaya peel waste carbon dots/reduced graphene oxide nanocomposite: From photocatalytic decomposition of methylene blue to antimicrobial activity[J]. Journal of Bioresources and Bioproducts, 2023, 8(2): 162-175. doi: 10.1016/j.jobab.2023.01.009
shu

Papaya peel waste carbon dots/reduced graphene oxide nanocomposite: From photocatalytic decomposition of methylene blue to antimicrobial activity

doi: 10.1016/j.jobab.2023.01.009
  • a.

    Department of Food Science and Technology, International Hellenic University, Thessaloniki 57400, Greece

  • b.

    Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India

  • c.

    Department of Food Science and Engineering, College of Light Industry and Food, Nanjing Forestry University, Nanjing 210037, China

More Information
  • Corresponding author: E-mail address: critzou@ihu.gr (C. Ritzoulis)
  • Available Online: 2023-01-20
  • Publish Date: 2023-05-01
    Abstract
  • Carbon dots (CDs) have gained unprecedented attention as a novel luminescent zero-dimensional carbon nanomaterial owing to their diverse industrial applications. Herein, we reported the sustainable synthesis of fluorescent CDs from papaya peel waste, acting as a natural carbon originator. As-prepared CDs and reduced graphene oxide (RGO) were fabricated in the composites through a facile one-step hydrothermal method. Synthesized RGO/CDs (RC) nanocomposites were characterized using spectroscopic, diffraction, and electron-microscopic techniques. Nanocomposites with variable RGO to CD mass ratios were tested for photodegradation of textile dye methylene blue (MB). The highest photocatalytic activity (degradation efficiency of 87% in 135 min) was obtained in the nanocomposite containing a 2꞉1 mass ratio (RC2). The RGO sheets in the nanocomposite acted as media for electron acceptors, promoting the fast transfer and separation of photoinduced electrons during CDs excitation, thus preventing the recombination of the electron and holes. Based on the agar well diffusion assay, the nanocomposites exhibited excellent antibacterial activity than other tested materials against Bacillus subtilis (Gram-positive) and Pseudomonas aeruginosa (Gram-negative) bacterium. The largest inhibition zone area (22 mm), i.e., the highest antimicrobial activity, was obtained in the nanocomposite tested against Gram-positive strains. Taken together, the synergistic effect of RGO and CDs enhanced the photocatalytic and antibacterial performance of synthesized nanocomposite material.

     

    • Declaration of Competing Interest The authors declare no competing financial interest.
    Supplementary material associated with this article can be found, in the online version, at doi:10.1016/j.jobab.2023.01.009.
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