Visible-Ultraviolet Upconversion Carbon Quantum Dots for Enhancement of the Photocatalytic Activity of Titanium Dioxide.

ABSTRACT: Visible-ultraviolet upconversion carbon quantum dots (CQDs) are synthesized with a hydrothermal method using l-glutamic acid (l-Glu) and m-phenylenediamine (MPD) and then combined with commercial nano-TiO₂ to prepare CQDs/TiO₂ composites. The fluorescence spectra prove that the prepared CQDs can convert approximately 600 nm visible light into 350 nm ultraviolet light. In photocatalysis experiments, CT-1, a CQDs/TiO₂ composite with 1:1 molar ratio of l-Glu to TiO₂, has the best degradation efficiency for methyl orange (MO). Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) experiments confirm that CT-1 is composed of quasi-spherical nano-TiO₂ and CQDs with a crystal plane of graphitic carbon. CT-1

SUBMITTER: Deng Y 

PROVIDER: S-EPMC7893638 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature