Metal free, sunlight and white light based photocatalysis using carbon quantum dots from Citrus grandis: A green way to remove pollution

We have developed a facile and green synthesis of Undoped carbon quantum dots and N-doped carbon quantum dots from naturally available Pomelo juice as a precursor using one-step hydrothermal method

Venkadeshkumar Ramar; Shaheer Moothattu; Karthikeyan Balasubramanian

2018

Scholarcy highlights

  • In this work, we have developed a facile and green synthesis of Undoped carbon quantum dots and N-doped carbon quantum dots from naturally available Pomelo juice as a precursor using one-step hydrothermal method
  • As synthesized CQDs have excellent solar light harvesting and the unique photo generated electron transfer property, which makes the CQDs as the outstanding photocatalytic applications
  • The prepared CQDs presented a photoluminescent of brightness blue, high aqueous dispersion, chemical stability, an average particle size of 1.16 nm ± 0.1 nm and surface carboxylic and amine groups together with some dopants from the bio-precursor
  • The bare mesoporous TiO2 semiconductor was impregnated with CQDs and the resultant composites presented a red-shift in the energy band gap with values from 2.3 eV to 2.08 eV, clearly lower than those on bare semiconductor and depending on the amount of CQDs
  • The CQDs/TiO2 photoelectrodes increased their photocurrent when they were exposed to the Ultraviolet to Visible spectroscopy light, a decrease of photoelectrochemical band gap energy and an increase of the charge transfer constant in contrast with bare TiO2
  • The NPs had excellent photocatalytic properties under solar radiation, degrading 100% of the OM in 180 min
  • These CQDs/TiO2 photoanodes were evaluated in carbon quantum dots-sensitized solar cells where there was an increase in the performance of the photovoltaic parameters compared with the bare semiconductor

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