Preparation method of nano magnetic core-shell catalyst for degrading dye wastewater

Abstract

The invention discloses a preparation method of a nano magnetic core-shell catalyst for degrading dye wastewater. The preparation method comprises the following steps of: (1) preparing Fe3O4 nanoparticles by a coprecipitation method; (2) putting the Fe3O4 nanoparticles into 0.05 to 0.5 mol/L of FeSO4 solution, controlling the amount ratio of the Fe3O4 to the FeSO4 to be (1:3) to (1:8) and adding alkali until the pH of a reaction system is between 6 and 8; (3) adding 0.01 to 0.5 mol/L of KMnO4 solution at a low dripping speed, controlling the pH of a control system constant in a dripping process and reacting at the temperature of between 50 DEG C and 80 DEG C for 3 to 6 hours; and (4) after the reaction is finished, filtering, separating, washing with deionized water and drying an obtained product at the temperature of between 70 DEG C and 110 DEG C for 10 to 16 hours so as to obtain the nano magnetic catalyst with a core-shell structure. The catalyst has high catalytic activity under acid, nearly neutral and alkali condition, can effectively degrade methylene blue serving as an organic dye in water, has magnetism, and is easy to recycle.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for degrading organic dye wastewater, in particular to a method for preparing a ferromagnetic core-shell structure iron-manganese composite oxide nano-catalyst, which belongs to the technical field of catalyst preparation. Background technique [0002] In recent years, my country's limited water resources have been seriously polluted, and the water balance in the ecological environment has been severely damaged. Especially since entering the 21st century, my country has 62-70 billion tons of sewage discharged every year. If it is not treated or treated but not up to standard, it will seriously pollute the environment. According to statistics, organic printing and dyeing wastewater accounts for about 35% of the discharged wastewater. Because of its high concentration of organic matter, dark color, and difficulty in biodegradation, it is more technically difficult to treat organic printing and dy...

AI Technical Summary

Problems solved by technology

But there are some deficiencies in this method at present, such as, generally speaking, the catalytic efficiency of nano-catalysts is not high enough, H 2 o 2 It cannot be completely decomposed by catalysis; in addition, nano-catalysts are difficult to recycle, and they are discharged into the ecological environment to form secondary pollution, and the loss and waste of catalysts are more serious, etc.

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