Citation: N. Thirugnanam, Huaibing Song, Yan Wu. Photocatalytic degradation of Brilliant Green dye using CdSe quantum dots hybridized with graphene oxide under sunlight irradiation[J]. Chinese Journal of Catalysis, ;2017, 38(12): 2150-2159. doi: 10.1016/S1872-2067(17)62964-4 shu

Photocatalytic degradation of Brilliant Green dye using CdSe quantum dots hybridized with graphene oxide under sunlight irradiation

a Department of Physics, Annamalai University, Annamalai Nagar 608002, Tamil Nadu, India;
b Faculty of Materials Science and Chemistry, China University of Geosciences(Wuhan), Wuhan 430074, Hubei, China

Received Date: 3 October 2017
Revised Date: 1 November 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (51774259) and Engineering Research Center of Nano-Geo Materials of Ministry of Education (NGM2017KF004 and NGM2017KF012).

CdSe quantum dots (QDs) hybridized with graphene oxide (GO) are synthesized by a facile chemical precipitation method. The absorption of the CdSe/GO nanocomposite is increased with a significant blue shift with respect to CdSe QDs. The specific surface area of the CdSe/GO nanocomposite is 10.4 m²/g, which is higher than that of CdSe QDs (5 m²/g). The PL intensity of the CdSe/GO nanocomposite is lower than that of the CdSe QDs owing to the inhibition of the recombination of electron-hole pairs in the composite. In Raman analysis, the two bands of the CdSe/GO nanocomposite are shifted to higher wavenumbers with respect to graphene oxide, which is attributed to electron injection that is induced by CdSe QDs into graphene oxide. Using the Brilliant Green dye, the photocatalytic reduction efficiency of CdSe QDs and the CdSe/GO nanocomposite under sunlight irradiation for 90 min are approximately 81.9% and 95.5%, respectively. The calculated photodegradation rate constants for CdSe QDs and the CdSe/GO nanocomposite are 0.0190 min^-1 and 0.0345 min^-1, respectively. The enhanced photocatalytic activity of the CdSe/GO nanocomposite can be attributed to the high specific surface area and the reduction of electron-hole pair recombination because of the introduction of graphene oxide.
- CdSe quantum dots,
- Graphene oxide,
- Nanocomposite,
- Photocatalytic activity,
- Brilliant green dye
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