Composite gel ball containing graphene oxide quantum dots/magnetic chitosan oligosaccharide, and preparation method and application of composite gel ball

Abstract

The invention belongs to the field of sewage treatment, and particularly relates to a composite gel ball containing graphene oxide quantum dots / magnetic chitosan oligosaccharide, and a preparation method and application of the composite gel ball. The preparation method of the composite gel ball comprises the following steps: 1) adding poly-gamma glutamic acid and chitosan oligosaccharide into deionized water until the poly-gamma glutamic acid and the chitosan oligosaccharide are completely dissolved, carrying out cooling, adding a ferroferric oxide dispersion liquid, and carrying out stirringto prepare a magnetic chitosan oligosaccharide solution; 2) adding polyvinyl alcohol and sodium alginate into deionized water to completely dissolving the polyvinyl alcohol and the sodium alginate, carrying out cooling to obtain a polyvinyl alcohol / sodium alginate water solution, and uniformly mixing the polyvinyl alcohol / sodium alginate water solution with the magnetic chitosan oligosaccharide solution to obtain a composite embedded carrier water solution; and 3) uniformly mixing graphene oxide quantum dots with the composite embedded carrier water solution to obtain a mixed solution, dropwise adding the mixed solution into a calcium chloride / saturated boric acid solution until small balls are formed, carrying out fixing and cross-linking, and carrying out low-temperature preservation toobtain the composite gel ball. The composite gel ball prepared by the method is large in adsorption capacity and good in mechanical strength and is recyclable.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a composite gel ball containing graphene oxide quantum dots / magnetic chitosan oligosaccharides and a preparation method and application thereof. Background technique [0002] In recent years, under the double influence of natural factors and human factors, the pollution of surface water bodies in my country has become increasingly serious. Adsorption is considered a cost-effective method in sewage treatment. However, traditional adsorbents have disadvantages such as low adsorption capacity and inconvenient separation. Therefore, adsorption materials with stronger adsorption performance are needed. To be used in actual sewage treatment, sewage treatment materials should be environmentally friendly, recyclable or degradable, and recyclable. [0003] Carbon nanomaterial adsorbent has the characteristics of high specific surface area, easy acquisition, simple synthesis...

AI Technical Summary

Problems solved by technology

However, the use of boric acid cross-linking agents in the preparation of polyvinyl alcohol gels is toxic to microbial cells, and the polyvinyl alcohol carrier is prone to adhesion during use, resulting in embedded particles that are easily broken, large mass transfer resistance, and gas production. Defects such as floating and large loss of activity

The preparation of sodium alginate immobilized beads requires calcium ion cross-linking to form a gel, which can effectively embed microbial cells and has high microbial activity, but the stability of calcified sodium alginate gel is poor, and it is easy to react with multiple ions or When calcium ions diffuse and potassium and sodium ions gather in large quantities, it becomes soft, and the phenomenon of "leakage of enzyme" appears

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