A kind of hydrogel foaming material for treating heavy metal sewage and preparation method thereof

Abstract

The invention discloses a hydrogel foaming material for treating heavy metal sewage. By using an enhancing action of humic acid and sepiolite, the humic acid and sepiolite are uniformly inserted into a three dimensional reticular hydrogel material formed by methacrylic acid, polyethylene glycol and polyvinyl alcohol to form a hydrogel material which has a steady structure and excellent mechanical properties and has good adsorption efficiency and large adsorbing capacity on heavy metal ions, the production cost is reduced, the thermal degrading temperature of the material is improved, the service life of the material is prolonged, and the material is suitable for a sewage disposal technology. The invention further discloses a preparing method of the hydrogel foaming material for treating the heavy metal sewage, and a production process is simple, low in cost, safe and environment-friendly and has market application prospect.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a hydrogel foaming material for treating heavy metal sewage and a preparation method thereof. Background technique [0002] With the rapid development of modern industrial industries and rapid economic growth, a large amount of sewage containing heavy metals will be produced in industrial industries such as electroplating, electronics, mineral processing, metallurgy, chemical industry and automobiles, and the discharge of sewage containing heavy metals will be harmful to human health and industry. Agricultural production wreaks havoc. In nature, heavy metal ions do not have the ability of self-purification and biodegradation. Once heavy metal ions enter the natural environment, they will pollute water, soil and the atmosphere, and can be continuously enriched through the biological chain, and can even be absorbed by plants and endanger them through the food chain. human ...

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Problems solved by technology

However, the hydrogel prepared by this method has a small adsorption capacity and poor mechanical properties.

[0004] Chinese Patent Publication No. CN102453187A discloses a polymer hydrogel that absorbs heavy metals and its preparation method and application. The hydrogel described in this invention is a three-dimensional network polymer that is insoluble in water but highly swellable in water. Ethyl ester (hydrophilic glassy monomer) and 2-acrylamido-2-methylpropanesulfonic acid are produced by radiation copolymerization; it has a low degree of cross-linking, high swelling rate, water-insoluble structure and Performance characteristics; it has strong water absorption capacity, good water retention, and will not dehydrate even if it is pressurized after water absorption, and has the basic characteristics of general polymer compounds; but the hydrogel microspheres prepared by the invention have poor structural stability and adsorption efficiency

The chemical foaming method of this invention has a simple process and is not demanding on equipment, and only needs an ordinary single-screw extruder for foaming; but the polyvinyl alcohol foaming material prepared by this invention is not suitable for sewage treatment

[0006] With the rapid development of my country's economy and industry, the problem of heavy metal ions in sewage has been paid more and more attention. As an important part of sewage treatment technology, sewage treatment materials have also attracted attention from various fields. Currently, they are used to treat heavy metal ions in sewage There are fewer types of hydrogel materials, which greatly limits the selection of sewage treatment materials. Therefore, it is necessary to develop a hydrogel suitable for sewage treatment that has good adsorption efficiency for heavy metal ions in sewage, large adsorption capacity, and excellent mechanical properties. It is of great significance to enrich sewage treatment materials and promote the development of sewage treatment