Open AccessCuO as efficient photo catalyst for photocatalytic decoloration of wastewater containing Azo dyes
Author(s) -
Martha Ramesh
Publication year - 2021
Publication title -
water practice and technology
Language(s) - English
Resource type - Journals
ISSN - 1751-231X
DOI - 10.2166/wpt.2021.067
Subject(s) - catalysis , photocatalysis , methylene blue , aqueous solution , monoclinic crystal system , precipitation , nuclear chemistry , band gap , nanoparticle , oxide , materials science , wastewater , crystal violet , visible spectrum , inorganic chemistry , chemistry , crystal structure , nanotechnology , organic chemistry , environmental engineering , medicine , physics , optoelectronics , pathology , meteorology , engineering
Cupric oxide nanoparticles (CuO NPs) were prepared via a chemical precipitation method using the precursor of copper (II) nitrate trihydrate. X-ray diffraction analysis confirms that the CuO NPs were a monoclinic crystal structure. The energy band gap of CuO NPs was found to be about 1.76 eV. The obtained CuO NPs were used as a photo catalyst to decolorize various dyes, such as methylene blue (MB), acid yellow 23 (AY 23) and reactive black 5 (RB 5), with a low concentration in the presence of visible light. The results show that the highest decolorization achieved was 67.8% and 66.3% for RB-5 dye and AY-23 dye, while 43.5% for MB dye from aqueous solution at 5 h illumination. The obtained CuO NPs were used as a photo catalyst to decolorize various dyes, RB-5, AY-23 and MB dye obeys pseudo first order kinetics with values of −0.112, −0.174 and −0.201 h−1, respectively.
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