Method for preparing chitosan-bentonite adsorbing material prepared from shrimp shells

Abstract

The invention relates to a method for preparing a chitosan-bentonite adsorbing material prepared from shrimp shells, and belongs to the field of absorbing materials. The method for preparing the chitosan-bentonite adsorbing material prepared from shrimp shells is provided in order to overcome the defects that according to an existing bentonite adsorbing material, due to extremely-high hydrophilia on the surface and hydrolysis of a large number of exchangeable cations between layers, a layer of thin water membrane usually exists on the surface, soil hydrophilia is caused, hydrophobic organic contaminants cannot be effectively absorbed, and the absorbing effect is poor. According to the chitosan-bentonite adsorbing material prepared through the method, for the reason that an organic molecule chitosan polymer is introduced, the dispersed state of bentonite in water is changed, the hydrophilia is also changed, the activity is improved, the interlayer spacing is increased, and therefore the adsorption capacity and ion exchange capacity of the material to organic matter are enhanced.

Description

technical field [0001] The invention relates to a preparation method of a chitosan-bentonite adsorption material prepared from shrimp shells, belonging to the field of adsorption materials. Background technique [0002] Chitosan is a deacetylated derivative of chitin, and its molecule contains many amino and hydroxyl active groups. As a natural organic polymer flocculant, chitosan is non-toxic, harmless, biocompatible and multifunctional. Features such as functionality have been applied in printing and dyeing wastewater, medicine, food industry, bioengineering and agriculture. However, because chitosan has low density and is easy to float, it is difficult to contact with the adsorbed substances in the solution, and its price is relatively high, which limits the use of chitosan. [0003] Bentonite is a compound with montmorillonite as the main mineral component and a small amount of clay minerals such as illite, kaolinite, and montmorillonite mixed layers. It has a large sur...

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention: for the current bentonite adsorption material has extremely strong hydrophilicity on the surface and hydrolysis of a large amount of exchangeable cations between the layers, so that there is usually a thin water film on the surface, which leads to the hydrophilicity of the soil, However, the disadvantages of being unable to effectively adsorb hydrophobic organic pollutants and poor adsorption effect are provided. A preparation method of chitosan-bentonite adsorption material prepared from shrimp shells is provided. The method uses traditional methods to process crayfish shells, using acid Alkali soaking, oxidation and other methods remove calcium, protein and pigment in crayfish to prepare chitin, add alkali to chitosan to obtain chitosan, dissolve chitosan in acid, add bentonite, stir and add alkali solution and epichlorohydrin, followed by suction filtration, drying, and grinding to obtain the chitosan-bentonite adsorption material. The chitosan-bentonite adsorption material made by this method has changed due to the introduction of organic molecular chitosan polymers. The dispersion state of bentonite in water changes its hydrophilicity, improves its activity, and increases the interlayer distance, thereby enhancing its adsorption and ion exchange capacity for organic matter.