Enhanced reactivity of the CuO-Fe2O3 intimate hetero-junction for the oxidation of quinoline yellow dye (E104)

Abstract

This research work was designed to study the elimination of quinoline yellow (QY) in aqueous solutions by the heterogeneous Fenton and photo-Fenton processes in the presence of CuO/Fe2O3 photocatalyst. CuO/Fe2O3 derived from LDH structure was synthesized by the co-precipitation method. The physiochemical characteristics of CuO/Fe2O3 are des cribed by XRD, TEM/SEM, BET surface area, FTIR and pHPZC.The effects of pH, H2O2 concentration, dye concentration, catalyst dose, reaction temperature, and reusability of catalyst on the QY decolorization efficiency were studied. The results indicated that a complete removal of QY was achieved within 150 min when the H2O2 and QY concentrations were 27.6 mM and 100 mg/L, respectively. The rate constants for QY removal by the heterogeneous Fenton system were calculated and the experimental data were found to fit the pseudo-first order model. Under optimal conditions, the rate constants were respectively 0.02032 and 0.02016 min-1 for the photo-Fenton and Fenton systems, this means that the addition of light has no significant effect.

Effect of Temperature Variation on Band Gap Value in Thin Layers of Nano Photocatalyst Fe2O3/CuO/MnO2

“…This research was carried out in several stages, sample preparation and synthesis techniques, characterization techniques, and data analysis. Fe2O3, CuO, and MnO2 powders were weighed as much as 10 grams each, then milled using High Energy Milling (HEM-E3D) for 5 hours for Fe2O3, for 20 hours for CuO and MnO 2 powders to obtain particles in nano-size to speed up the photocatalyst process [14]. Fe2O3/CuO/MnO2 was synthesized using the sol-gel method [10] as follows: Manufacture of precursors Fe(NO3)2•9H2O obtained by mixing 1.25 grams of Fe2O3 with 0.18 grams (Nitric Acid) HNO3, then precursors Cu(CH3 COO)2•H2O was obtained by mixing 3.7 grams of CuO with 0.54 grams (Acetic Acid) CH3COOH.…”

The Effect of Milling Time on Band Gap Value in Thin Layers of Nano Photocatalyst MnO2/CuO/Fe2O3

“…The advantage of this photodegradation is that it does not produce by-products. And some of the advantages of using photocatalysts include low cost, fast processing, and mineralizing organic pollutants [5,6]. The conduction band and valence band have an important role in the photocatalyst process which has a distance between them which is called the band gap.…”