A kind of preparation method of high specific surface area magnesium hydroxide/graphene composite material

Abstract

A preparation method of a high-specific-surface-area magnesium hydrate / graphene composite comprises the following steps: (1) dissolving bischofite with deionized water and filtering out solid insoluble substances; (2) adding graphene into a magnesium chloride solution, and performing ultrasonic dispersion; (3) adjusting the pH value to be 2-10; (4) guiding into an electrolytic cell, and by taking a graphite plate as the negative pole and a metal or metal alloy material as the positive pole, performing DC electrolysis on a magnesium chloride / graphene electrolyte; and (5) drying a product obtained through electrolysis. The preparation method is quick, low in cost, simple to operate and mild in condition, the obtained product composite is uniform in granularity, controllable in shape and high in specific surface area and has a bright application prospect in the aspect of adsorbents, and meanwhile, comprehensive utilization of bischofite resources in salt lakes is realized.

Description

technical field [0001] The invention belongs to the technical field of inorganic composite materials, in particular to a preparation method of a magnesium hydroxide / graphene composite material with a high specific surface area. Background technique [0002] With the rapid development of industrialization, the pollution caused by the discharge of "three industrial wastes" has become a global environmental problem. Coagulation method, membrane separation method, electrophoresis method and adsorption method are commonly used in the treatment of wastewater and waste gas. Among these methods, adsorption method is a fast and efficient removal method. Adsorption is generally divided into chemical adsorption and physical adsorption. , physical adsorption is considered to be the most efficient and economical method, and most of it is reversible, can be recycled, and is suitable for treating large amounts of wastewater and waste gas. [0003] Pure magnesium hydroxide is a hexagonal c...

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Problems solved by technology

[0004] my country is rich in salt lake resources, and bischofite (MgCl 2 •6H 2 O≥95%) exceeds 20 million tons, providing a resource base for the production of magnesium hydroxide; currently there are roughly four methods for producing magnesium hydroxide with bischofite as raw material: bischofite thermal decomposition method, lime milk precipitation method , sodium hydroxide method and ammonia method; but the products synthesized by these methods have small particle size, serious agglomeration, are difficult to settle, filter and wash, and are easy to adsorb impurities, and the product purity is low. These characteristics have seriously affected the use of magnesium hydroxide in adsorbents. As we all know, an important index to evaluate the quality of adsorbent is the specific surface area, the larger the specific surface area, the better the adsorption effect; therefore, researchers have used various methods to increase the specific surface area of ​​magnesium hydroxide to improve its adsorption performance, including form controllable growth of surface, addition of dispersants and surfactants, hydrothermal retreatment, and compounding with other materials to produce synergistic effects, etc.

[0005] At present, the combination of magnesium hydroxide and carbon materials is an effective way to increase the specific surface area of ​​magnesium hydroxide, but there are few studies at present, and industrial scale applications have not been realized.

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