Preparation method for cellulose/chitosan compound anti-microbial adsorbent

Abstract

The invention discloses a preparation method for a cellulose / chitosan compound anti-microbial adsorbent. The preparation method comprises the following steps: taking microcrystalline cellulose as a raw material; selectively oxidizing the microcrystalline cellulose, thereby acquiring dialdehyde cellulose; in-situ generating nanometer ZnO on the surface of dialdehyde cellulose through a hydrothermalprocess; compounding the dialdehyde cellulose loaded with nanometer ZnO with chitosan; freeze-drying, thereby acquiring the cellulose / chitosan compound anti-microbial adsorbent. The material has an excellent adsorptive property for heavy metal ions and dyestuffs, has antibacterial rate of 93.0%-99.9% to gram-positive bacterium and gram-negative bacterium and has an excellent anti-microbial property; the adsorbent can be widely used for treating various wastewater containing various heavy metal ions and dyestuffs; the preparation of the adsorbent is simple and the reaction condition is mild; the adsorbent has a broad application prospect in the field of sewage treatment.

Description

technical field [0001] The invention relates to a preparation method of a cellulose / chitosan composite material, in particular to a preparation method of an antibacterial cellulose / chitosan composite adsorbent. Background technique [0002] Textile industry, metal processing, electronics and other industries have caused serious water pollution, resulting in a large amount of synthetic dyes and heavy metal ions in the water. These sewage will lead to deterioration of water and soil, and destroy the entire ecological environment. Among them, the dye sewage has a large amount, deep color, and toxicity. Heavy metal ions in contact with human skin or drunk by humans can cause allergies, diseases, and even cancer. Water pollution has become an urgent problem to be solved. The adsorption method is considered to be one of the most economical and effective methods for removing pollutants in water because of its simple operation, low cost, and no by-products. Water pollution also pro...

AI Technical Summary

Problems solved by technology

The Chinese patent with the publication number CN109529785A proposes a method for preparing a cellulose nanocrystal-loaded zinc oxide composite material, which uses citric acid / hydrochloric acid mixed acid to treat bamboo or bamboo products to prepare cellulose nanocrystals as a template for nano-zinc oxide Regulating agent and dispersant, prepared cellulose nanocrystal / zinc oxide composite material, this composite material has the performance of antibacterial property and adsorption cationic dye concurrently, this method uses a large amount of acid when preparing cellulose nanocrystal, in addition zinc oxide The preparation process is complex and time-consuming. The author only stated that the composite material has a fast adsorption capacity for cationic dyes, and did not show the adsorption capacity for other pollutants.

Publication number is that the Chinese patent of CN109279674A discloses a kind of preparation method of the antibacterial deodorant fiber that is used for water quality purification, and this method is with the mixture of glass fiber blended bamboo charcoal fiber, bentonite cross-linked oxidized chitosan quaternary ammonium salt and stock solution viscose as The spinning solution is prepared by wet spinning, in which the glass fiber blended bamboo charcoal fiber is prepared through high-temperature melting at 650-800°C and electrospinning, and the preparation of antibacterial and deodorizing modified fibers requires high energy consumption and complicated processes