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Carbon quantum dots-decorated nano-zirconia: A highly efficient photocatalyst

Ratnayake, SP and Mantilaka, MMMGPG and Sandaruwan, C and Dahanayake, D and Murugan, E and Kumar, S and Amaratunga, GAJ and de Silva, KMN (2019) Carbon quantum dots-decorated nano-zirconia: A highly efficient photocatalyst. Applied Catalysis A: General, 570. pp. 23-30. ISSN 0926-860X

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A unique and efficient composite material was synthesized by incorporating carbon quantum dots on to the surface of zirconia (ZrO ) nanoparticles. ZrO nanoparticles with an average diameter of 40 nm were synthesized by a sol-gel process with zirconium oxychloride as the precursor. Carbon quantum dots (CQDs) were synthesized via a facile method by calcining a solution of ammonium citrate. Synthesized CQDs suspended in absolute ethanol emitted a green glow under UV irradiation. A convenient one-step process involving mixing in absolute ethanol under sonication was adopted for the formation of CQD-decorated ZrO nanoparticles (CQDZ). The dried final composite was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Fourier transform infrared (FT-IR) spectroscopy. The photocatalytic performance of CQDZ was evaluated by quantifying the removal efficiency of methylene blue dye. CQDZ managed to remove methylene blue by 66.5%, 76.5%, 84.3% and 95.0% under UV-irradiation of 10, 20, 40 and 60 min respectively. Under the same experimental conditions, pure ZrO nanoparticles managed to remove only 34% of the dye under 60 min of UV irradiation. The produced composite showed promise as a formidable contender to be used in industrial dye removal from waste water. 2 2 2 2

Item Type: Article
Depositing User: Cron Job
Date Deposited: 27 Sep 2019 20:50
Last Modified: 13 Apr 2021 10:38
DOI: 10.1016/j.apcata.2018.10.022