A kind of cellulose/tannin hydrogel and preparation method thereof

Abstract

The invention belongs to the technical field of materials and provides a cellulose / tannin hydrogel, which is a product obtained by crosslinking and immobilizing a mixed solution of tannin and cellulose plus a crosslinking agent. The preparation method comprises the following steps: (1) dissolving cellulose in a solvent composed of urea / alkali / water or thiourea / alkali / water at low temperature to obtain a cellulose solution; (2) adding tannin to the cellulose solution, Place in an ice bath and disperse evenly with ultrasound to obtain a mixed solution of tannin and cellulose; (3) add a cross-linking agent to the mixed solution obtained in step (2) to carry out cross-linking and immobilization reactions at the same time to obtain cellulose / mono Ning water gel. The present invention uses cellulose as an immobilization carrier, adopts a homogeneous reaction method to immobilize tannins, especially condensed tannins with better stability, on the cellulose, and immobilizes and materializes tannins in one step to obtain A gel adsorbent with good performance can be widely used in water treatment.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a cellulose / tannin hydrogel and also relates to a preparation method thereof. Background technique [0002] Tannin is a natural polyphenol compound found in the bark and fruit of various trees (such as rubber trees, sumac trees, etc.). The molecular structure of tannin is rich in ortho-phenolic hydroxyl groups, which can electrostatically combine and complex with heavy metal ions or cationic organic dyes to form a five-membered chelate ring, so it has good water treatment ability[Sep. Purif . Technol., 2006, 47, 113]. However, the very water soluble nature limits the use of tannins as good adsorbent materials. In order to solve this problem, scientists considered combining tannins on silica, activated carbon [J. Mol. Catal. A: Chem., 2010, 320, 40], resin [J. Hazard. Mater. , 2009, 166,1488] and hydrotalcite [Appl. Clay Sci., 2008, 42, 214] and other non-water-so...

AI Technical Summary

Problems solved by technology

For this method of "heterogeneous immobilization" of tannins, the structure of the carrier itself (such as pore structure) largely affects whether the immobilization reaction occurs on the surface or inside of the carrier, thereby affecting the immobilization effect of tannins, and Fixed tannins are easy to fall off from the carrier [J. Chem. Technol. Biotechnol.,2004,79, 335]

Images