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Fabrication of blue fluorescent carbon quantum dots using green carbon precursor Psidium guajava leaf extract and its application in water treatment

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2022, 32(1), pp.119-129
  • DOI : 10.1007/s42823-021-00259-w
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : January 21, 2021
  • Accepted : May 24, 2021
  • Published : January 1, 2022

Velmurugan Palanivel 1 Kumar Ravichandran Visnu 1 Sivakumar Subpiramaniyam 2 Ravi Arumugam Veera 1

1Department of Biotechnology, Science Campus, Alagappa University, Karikudi, Tamilnadu
2Centre for Materials Engineering and Regenerative Medicine, Bharath Institute of Higher Education and Research (BIHER)

Accredited

ABSTRACT

An extract of fresh guava leaves (Psidium guajava) was used as a green carbon precursor to fabricate blue fluorescent carbon quantum dots (GCQDs) by hydrothermal process. The GCQDs show bright blue fluorescence emission under UV light with an excitation wavelength of 350 nm and emission at 450 nm. The physical structure of GCQDs was characterized by Fourier-transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray diffraction (XRD), High-resolution transmission electron microscope (HR-TEM) and atomic force microscopy (AFM). GCQDs 80 µg inhibited the growth of waterborne pathogens Escherichia coli and Salmonella typhi. We also investigated the catalytic activity of the GCQDs on the removal of two azo dyes, namely Congo red and bromophenol blue, with and without NaBH4. The GCQDs showed an excellent reduction of color intensity of both dyes without NaBH4 within 30 min of treatment.

Citation status

This is the result of checking the information with the same ISSN, publication year, volume, and start page between the WoS and the KCI journals. (as of 2023-07-13)

Total Citation Counts(KCI+WOS) (9) This is the number of times that the duplicate count has been removed by comparing the citation list of WoS and KCI.

Scopus Citation Counts (7) This is the result of checking the information with the same ISSN, publication year, volume, and start page between articles in KCI and the SCOPUS journals. (as of 2023-10-01)

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