A preparation method of activated carbon-supported catalyst for electrocatalytic degradation of organic wastewater

Abstract

The invention relates to a preparation method of an active carbon loaded catalyst for electrochemically catalyzing and degrading organic wastewater and belongs to the technical field of preparation of catalysts. The preparation method comprises the following steps: preparing an active carbon solid containing a plurality of types of active metal by using a sol-gel method; adding P2O5 powder into the active carbon solid containing the active metal and roasting; sublimating the P2O5 powder into gas at a high temperature; and when the gas is expanded at the high temperature and escapes, generating a plurality of small pores in the active carbon, so that the specific surface area and adsorption capability of the active carbon are improved. According to the preparation method, rare earth metal is used in match with the other active metal so that grains on the surface of the catalyst are uniform and thinned; and meanwhile, the preparation method is combined with a method of adding the P2O5 powder to roast, so that the catalysis efficiency of the prepared active carbon loaded catalyst can be improved by more than 5%-15%. The method has a simple process, is convenient to operate and is low in cost; and in a process of electrochemically catalyzing and degrading the organic wastewater by using the prepared catalyst, other oxidants do not need to be additionally added and the large-scale industrialized application of the preparation method is facilitated.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to a preparation method of an activated carbon-supported catalyst, in particular to a preparation method of an activated carbon-supported catalyst used for electrocatalytically degrading organic wastewater. Background technique [0002] Due to the rapid development of modern industry, coking, oil refining, papermaking, plastics, ceramics, textiles and other processes, as well as production processes such as petroleum cracking to ethylene, synthetic phenol, polyamide fiber, organic pesticides and phenolic resins, etc., produce a large amount of phenolic organic pollutant wastewater . Phenol and its derivatives (such as cresol, xylenol, and nitrocresol) in wastewater are all aromatic compounds, which are very toxic to organisms in water bodies, and are difficult to degrade, which can easily cause serious damage to water bodies. Pollution, solving the problem of phenol-cont...

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Problems solved by technology

However, the preparation process of this patent is complex and requires high production equipment. It is necessary to use hydrogen-nitrogen mixed gas to reduce the activated carbon, and this patent also needs to impregnate the reduced activated carbon with a barium-containing solution before impregnating a potassium-containing solution, which is easy to cause The dissolution of the barium ions impregnated for the first time in the second potassium solution not only contaminates the second potassium solution, but also causes a large difference between the actual load of metal ions and the theoretical amount. In addition, if the used impregnating solution is poured directly The discharge will inevitably cause environmental pollution, and if post-treatment is carried out, the production cost of the catalyst will be increased accordingly

In addition, the above two invention patents mainly rely on the carrier activated carbon to adsorb the catalyst ions in the wastewater in the process of using the catalyst to degrade the organic wastewater. However, the adsorption capacity of the activated carbon is limited and it is easy to be saturated, so it is difficult to completely adsorb the catalyst ions to the activated carbon. Therefore, these catalysts are not only used in a large amount in the treatment of wastewater, but also have low effectiveness. These factors limit the large-scale application of these catalysts in actual wastewater treatment.

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