Method for catalyzing ozone to degrade organic pollutants

Abstract

The invention discloses a method for catalyzing ozone to degrade organic pollutants.The method comprises the following steps: synthesizing a copper-cerium binary composite catalyst (CuO-CeO2) by a hydrothermal-roasting method, and characterizing by an X-ray diffractometer (XRD), a scanning electron microscope (SEM) and a transmission electron microscope (TEM). Oxalic acid is used as a model compound, CuO-CeO2 is used for carrying out a continuous flow catalytic ozonation test, the removal rate of the oxalic acid reaches 97.66% after 25 min and is far higher than the removal rate of systems such as O3 (2.66%), CuO / O3 (7.38%) and CeO2 / O3 (5.47%) on the oxalic acid, and the mineralization rate of the oxalic acid is 95.21%; the optimal reaction conditions of the CuO-CeO2 / O3 system are as follows: the ozone mass concentration is 30mg / L, the catalyst dosage is 0.20 g / L, and the pH value of the solution is 7; and more than 90% of oxalic acid can still be removed after the CuO-CeO2 is recycled for five times, so that the CuO-CeO2 has excellent stability and reusability. In the process of catalyzing O3 by CuO-CeO2, hydroxyl radicals are generated but do not play a leading role, and singlet oxygen is a main active oxidation species causing degradation of oxalic acid.

Description

technical field [0001] The invention relates to the technical field of organic matter degradation experiments, in particular to a method for catalyzing ozone to degrade organic pollutants. Background technique [0002] Catalytic ozonation technology mainly relies on catalysts to increase the amount of active free radicals generated by ozone. The process is simple, easy to operate, and low investment cost. It is an advanced oxidation technology with good application prospects. Most of the commonly used catalytic ozonation techniques rely on hydroxyl radicals ( · OH) to remove refractory organic matter, many metal oxides (such as MnO 2 、Co 3 o 4 , Fe 2 o 3 、TiO 2 ) are loaded onto carbon-based materials (activated carbon, biochar, graphene, etc.) or inorganic minerals (volcanic rock, montmorillonite, alumina, ceramic gravel, etc.) as catalysts, which usually rely on catalytic ozone to generate · OH dominates the removal of organic matter. In fact, · OH reacts slower w...

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Problems solved by technology

Although CuO-CeO 2 Composite materials have been well applied in the fields of three-way catalysis of automobile exhaust and CO oxidation in hydrogen-rich gas, showing excellent catalytic activity, but the application of copper-cerium composite catalysts to ozone catalysis to remove refractory organics less, especially · OH-dominated catalytic ozonation research is rarely reported

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