Quantum dots of ZnSe(S) doped with copper as nanophotocatalyst in the degradation of organic dyes

L. Alamo-Nole, S. Bailon-Ruiz, R. Cruz- Acuña, O. Perales-Perez, F.R. Roman-Velazquez
University of Puerto Rico at Mayaguez, US

Keywords: quantum dots, organic dyes, photodegradation

Summary:

Quantum dots of ZnSe(S) doped with copper synthesized via microwave-irradiation technique were used as photocatalyst agent in the photo-degradation of methylene blue (MB), methyl violet (MV) and victoria blue (VB) under UV irradiation at pH 6.5. Quantum dots were characterized by High Resolution Transmission Electron Microscopy (HR-TEM), X-ray diffraction (XRD), UV-Vis, photoluminescence and Fourier transform infrared (FT-IR) spectroscopy. The degradation of MB, MV and VB were monitored using High Performance Liquid Chromatography (HPLC) at 660 nm, 590 nm and 610 nm, respectively. Degradations of 46, 88 and 90 % of MB, MV and VB, respectively were achieved in presence of 1000 mg/L-quantum dots, after 6 hours of UV-irradiation. The Cu-doped ZnSe(S) QDs evidenced an excellent capacity to degraded cationic organic dyes as single components and in mixtures.