科研之友
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摘要
This research aimed to degrade quinoline wastewater using CWPO (short for catalytic wet peroxide oxidation). Following the complexation method Cu-Ce composite oxide catalysts were prepared. The properties of catalysts were characterized by probed into by employing XRD (short for X-ray diffraction), SEM (short for scanning electron microscopy), H-2-TPR (short for temperature programmed reduction) and XPS (short for X-ray photoelectron spectroscopy). Also, the degradation properties of varying Cu/Ce molar ratios, catalysts and H2O2 dosages and the initial pH of solution were investigated in the degrading of simulated quinoline wastewater. As the research results suggested, CeO2 and CuO for the prepared Cu-Ce composite oxide catalyst will become a Cu-Ce-O solid solution under calcination at high temperature, taking on a loose and porous structure on the surface. A little surface Cu2O will often appear as well though CeO2 and CuO are the main substances on the surface. The lattice oxygen on the surface is greater than the adsorbed oxygen and hydroxyl oxygen in amount; thus, the phase structure of this oxygen is greatly impacted by the Cu/Ce molar ratio. Besides, its reducibility decreases as Cu content increases. The Cu-Ce composite oxide catalyst takes on a potent performance of catalytic wet peroxide oxidation for simulated quinoline wastewater. The catalyst degradation performance turns the optimal under initial quinoline concentration of 100 mg L-1, Cu/Ce molar ratio of 1.0, dosage of catalyst and H2O2 of 0.16 g L-1 and 196 mmol L-1, respectively. Under these conditions, the TOC removal can reach 91.1%. The catalyst is highly adapted to pH. The removal efficiency of quinoline can be actually high under the pH value ranging from 5.1 and 10.5, and its reaction follows the first-order reaction kinetics equation.
