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Band Gap Energies and Photocatalytic Properties of CdS and Ag/CdS Nanoparticles for Azo Dye Degradation
Author(s) -
Fard Narges Elmi,
Fazaeli Reza,
Ghiasi Reza
Publication year - 2016
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201500116
Subject(s) - photocatalysis , scanning electron microscope , band gap , nanoparticle , materials science , cadmium sulfide , diffusion , degradation (telecommunications) , analytical chemistry (journal) , kinetics , activation energy , doping , fluorescence , diffuse reflection , visible spectrum , nuclear chemistry , sol gel , chemical engineering , chemistry , catalysis , nanotechnology , optics , optoelectronics , chromatography , organic chemistry , composite material , physics , quantum mechanics , engineering , computer science , metallurgy , thermodynamics , telecommunications
CdS nanoparticles were synthesized by the ultrasonic‐assisted sol‐gel method and characterized by X‐ray diffraction (XRD). The Ag‐doped CdS (Ag/CdS) nanoparticles were also synthesized by the ultrasonic‐assisted sol‐gel method and characterized by XRD, X‐ray fluorescence spectrometry, scanning electron microscopy, and energy‐dispersive X‐ray analysis. The calculated sizes and experimental results are in good agreement. The calculated band‐gaps of CdS and Ag/CdS were found to be 2.62 and 2.46 eV, respectively. Photocatalytic degradation of Direct Red 264 azo dye was investigated with CdS and Ag/CdS under UV‐C and visible light irradiation. Experimental results indicate that the degradation rate of DR 264 follows pseudo second‐order kinetics. Also, the intraparticle diffusion coefficients of CdS and Ag/CdS were determined.