Issue 18, 2013

Photocatalytic activity of quantum dot–magnetite nanocomposites to degrade organic dyes in the aqueous phase

Abstract

Quantum dots of Cd(Se,S) and fluorescent magnetic nanocomposites (Cd(Se,S)–magnetite) were used as photocatalytic agents in the photodegradation of methylene blue (MB) under UV irradiation at pH 6.5. Quantum dots and magnetic nanocomposites were characterized by X-ray diffraction (XRD), UV-Vis, photoluminescence and Fourier Transform Infrared (FT-IR) spectroscopy. The photo-induced degradation of MB was monitored using High Performance Liquid Chromatography (HPLC) at 660 nm and titanium dioxide (anatase and aeroxide P25 forms) was used as the photocatalyst standard. A degradation of 99.1% and 90.0% of MB was achieved in the presence of 160 mg L−1-quantum dots and the magnetic nanocomposite, respectively, after 4.5 hours of UV-irradiation. Instead, 45.9% and 100% of MB degradation was achieved using 160 mg L−1 of TiO2 anatase and aeroxide P25, respectively. The degradation products were studied by mass spectrometry (MS) and the results evidenced the formation of azure B, A, C and phenothiazine. The reuse of the magnetic nanocomposites (i.e., after one photo-degradation cycle) allowed a maximum photo-degradation capacity of 65%. The results suggested that the nanocomposite has 10% less photodegradation capacity than the widely used catalytic agents such as TiO2 aeroxide P25.

Graphical abstract: Photocatalytic activity of quantum dot–magnetite nanocomposites to degrade organic dyes in the aqueous phase

Supplementary files

Article information

Article type
Paper
Submitted
17 Nov 2012
Accepted
26 Feb 2013
First published
27 Feb 2013

J. Mater. Chem. A, 2013,1, 5509-5516

Photocatalytic activity of quantum dotmagnetite nanocomposites to degrade organic dyes in the aqueous phase

L. Alamo-Nole, S. Bailon-Ruiz, T. Luna-Pineda, O. Perales-Perez and F. R. Roman, J. Mater. Chem. A, 2013, 1, 5509 DOI: 10.1039/C3TA01135F

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