Catalyst composition and preparation method and application thereof in aspect of treating methylene blue industrial wastewater

Abstract

The invention relates to a Li2Ni2Mo3O12 catalyst composition and a preparation method and application thereof in the aspect of treating methylene blue industrial wastewater, and belongs to the technical field of inorganic functional material preparation. According to the Li2Ni2Mo3O12 catalyst composition, a lithium compound, nickel salt, molybdate and citric acid are sequentially added to water according to the molar ratio of 1 to 1 to 1.5 to 7-20, stirring is conducted for dissolving, ethylene glycol is added, the temperature rises to range from 100 DEG C to 130 DEG C, continuous stirring is conducted to form gel, the gel is calcined for 4-15 h at the temperature ranging from 400 DEG C to 900 DEG C finally, and the Li2Ni2Mo3O12 catalyst composition is prepared. The catalyst can efficiently catalyze hydrogen peroxide to conduct oxygenolysis on methylene blue dye in industrial wastewater at normal temperature and normal pressure without light irradiation, and the Li2Ni2Mo3O12 catalyst composition and the preparation method and application thereof in the aspect of treating the methylene blue industrial wastewater have the advantages that preparation is easy and rapid, the speed of degrading organic pollutants is high, the effect is significant, the treatment cost is low, and secondary pollution is not produced. In addition, the catalyst can be reused repeatedly, the degradation rates of the Li2Ni2Mo3O12 catalyst to the methylene blue industrial wastewater in second reuse and third reuse both exceed 90.0 percent.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic functional materials, relates to a catalyst composition, in particular to a Li 2 Ni 2 Mo 3 o 12 Catalyst composition, its preparation method and its application in treating methylene blue industrial wastewater. Background technique [0002] At present, organic dye wastewater has become one of the main sources of water pollution. The wastewater has the characteristics of large water volume, high concentration, complex composition, deep color and refractory degradation. Most dyes also have toxic, carcinogenic, teratogenic and mutagenic effects. Methylene blue is an important organic chemical synthetic cationic dye with a wide range of industrial applications. For example, it can be applied to the dyeing of hemp, silk fabrics, paper, bamboo and wood, the dyeing of biological and bacterial tissues, and the manufacture of ink and color lakes. The wide application of methylene bl...

AI Technical Summary

Problems solved by technology

The biological method is affected by factors such as pH value, temperature, salt and dye type, which makes the effect of biological treatment not ideal

The operating cost of the coagulation method is high, the amount of sludge is large and dehydration is difficult, and the applicable pH range is narrow

The photocatalytic method requires a light source irradiation system, which is greatly affected by the weather in practical applications

The adsorption method is easily affected by suspended solids and oil in water, and the amount of adsorbent is large and the cost is high

Membrane separation methods are divided into electrodialysis, reverse osmosis, nanofiltration and ultrafiltration, etc. Among them, electrodialysis, reverse osmosis and nanofiltration have the advantages of high dye removal rate and the ability to recover dyes in wastewater. Simple, but the cost of the membrane used is high, and the operating pressure is high, resulting in high energy consumption of the membrane method, which affects its industrial application

Due to the large pore size of the membrane, the traditional ultrafiltration method is difficult to remove low molecular weight organic pollutants

[0003] In the oxidation technology method, Fenton's reagent composed of ferrous ions and hydrogen peroxide is usually used to degrade organic dyes. The principle is that ferrous ions catalyze hydrogen peroxide to decompose organic matter. However, in this method, ferrous ions are difficult to recover and easily cause secondary pollution. shortcoming

The patent application with application number 201110058905.0 discloses a Cu that can degrade MB industrial wastewater 2 The preparation method and application of S catalyst, the patent application is to prepare copper organic complexes by reacting divalent copper with organic 4-chloro-3-aminobenzenesulfonic acid, and then use ethylene glycol and ethylenediamine as solvents to add copper organic complexes and soluble sulfide, reacted in a hydrothermal reactor for 6 to 48 hours to prepare Cu 2 S catalyst, Cu 2 The time for S to catalyze hydrogen peroxide to degrade methylene blue dye is 100 minutes, so the method has complicated preparation process, and Cu 2 Defects such as long degradation time and low degradation efficiency of S to methylene blue

The patent application with the application number 200510122782.7 discloses a methylene blue dye wastewater treatment method and a catalyst preparation method. The method uses a solvothermal method to prepare manganese nanostructure oxides, and catalyzes hydrogen peroxide to decompose methylene blue dye. The catalyst preparation process is also complicated and degradation The time required for methylene blue dye is long, etc.