Preparation method and application of load-type metal phthalocyanine catalyst

Abstract

The invention discloses a preparation method of load-type metal phthalocyanine catalyst, comprising: directly dipping a molecular sieve into phthalocyanine aqueous solution of which the molar volume density is 10-500 mu mol / L; adjusting the pH value to be 10-12; dipping at room temperature; stirring at interval; and centrifuging and drying to prepare the load-type metal phthalocyanine catalyst. The invention discloses an application of the catalyst in removing organic pollutants in water. The load-type metal phthalocyanine catalyst prepared with the invention has simple method, environment protection and low cost, the catalytic activity thereof is far higher than that of unloaded phthalocyanine catalyst, and the reaction condition is moderate and is not limited by waste water pH value. The load-type metal phthalocyanine catalyst does not generate secondary pollution, can be used for oxidation treatment of organic waste water systems and has industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalyst material research, and in particular relates to a preparation method of a supported metal phthalocyanine catalyst and its application in removing organic pollutants in wastewater. Background technique [0002] At present, the Fenton reaction in which hydrogen peroxide reacts with ferrous ions to generate hydroxyl radicals has been widely used in the degradation of organic pollutants. However, the use of Fenton reaction has two drawbacks: one is that the addition of iron ions will pollute the treated wastewater; the other is that Fenton reaction must be used under acidic conditions (pH value is around 3.0). However, the pH value of most of the actual wastewater is around 8. In this way, it is necessary to add acid to lower the pH value before treatment. If the treated wastewater is reused, followed by biological treatment or discharged into the environment, it needs to be neutralized with alkali, ...

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Problems solved by technology

However, using the Fenton reaction has two drawbacks: one is that the addition of iron ions will pollute the treated wastewater; the other is that the Fenton reaction must be used under acidic conditions (pH value is around 3.0)

However, in the process of loading phthalocyanine, these loading methods mainly have the following defects: (1) the catalysts obtained by these loading methods still have dimers, resulting in low catalytic activity and easy deactivation; (2) prepared by chemical bonding A series of complex steps are required, and the process is cumbersome, such as using silylating reagents to treat the surface of the carrier to generate silanol groups, then bond amino groups, and then chemically bond with phthalocyanine to obtain immobilized catalysts; (3) when preparing by impregnation , most of them use organic solvents, and the solubility of phthalocyanine in the organic phase is limited, and can only be dissolved in a few special expensive organic solvents, such as DMF, DMSO, etc.; if water is used as a solvent for impregnation, phthalocyanine still has polymerization behavior, Causes dimerization of phthalocyanine in the carrier and reduces catalytic activity

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