Size-Dependent Photocatalytic Activity of Carbon Dots with Surface-State Determined Photoluminescence.

ABSTRACT: Carbon dots (CDs) were synthesized by a microwave-mediated method and separated by size exclusion chromatography into three different size fractions. There was no correlation of the size with photoluminescence (PL) emission wavelength, which shows that the PL mechanism is not quantum-size dependent. UV/vis absorption and diffuse reflectance spectroscopies showed that the light absorption properties as well as the band gap of the CDs changed with the size of the particle. The combination of FTIR and XPS measurements revealed the composition on the surface of each fraction. The three CDs fractions were separately used in the photocatalytic degradation of organic dyes under simulated sunlight irradiation. The catalytic activity of the as-prepared CDs was found to increase as the size of the p

SUBMITTER: Zhou Y 

PROVIDER: S-EPMC7434043 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature