Preparation method of porous chitosan

Abstract

The invention discloses a preparation method of porous chitosan. The preparation method comprises the following steps: ultrasonically dispersing Fe3O4 nanoparticles into de-ionized water, adding ZrOCl2, fully mixing, heating, reacting to generate ZrO2 / Fe3O4 compound metal oxide nanospheres, adding into chitosan, dissolving in a 4% acetic acid solution to form sol-gel, dropwise filling 2 mol / L of a NaOH solution with the sol-gel through a peristaltic pump to form monodisperse microspheres, and performing freeze-drying to form a porous chitosan microsphere-loaded ZrO2 / Fe3O4 metal oxide. An adsorbent in the method is easy to prepare, convenient to operate, low in cost, remarkable in treatment effect and good in reproducibility, and can be quickly subjected to magnetic separation.

Description

technical field [0001] The invention belongs to the technical field of water purification treatment, and in particular relates to a preparation method of boehmite with a micro-nano hierarchical structure. Background technique [0002] Humic acid is the main component of dissolved organic matter in natural water. It is a macromolecular polycyclic aromatic compound containing phenolic hydroxyl, carboxyl, alcoholic hydroxyl and other functional groups. It is mainly derived from the biodegradation of animal and plant debris in nature. It accounts for 50% ~ 90% of the total organic matter in water. The existence of humic acid in water can cause a series of problems such as human health and the environment. The existence of humic acid in water is the main cause of water color and odor. Humic acid is easy to complex with heavy metal ions in water, which greatly increases the stability of colloids. In the process of chlorination and disinfection of drinking water, humic acid can re...

AI Technical Summary

Problems solved by technology

[0003] At present, the methods of humic acid treatment in water mainly include: enhanced coagulation sedimentation, membrane filtration, advanced oxidation and adsorption, etc., enhanced coagulation sedimentation and membrane filtration are commonly used methods, but enhanced coagulation is of low The removal effect of humic acid with high concentration is poor. Although the membrane filtration method has a good removal effect, it is easy to cause membrane pollution. The advanced oxidation method has problems such as high operating cost, complicated equipment, and limited processing capacity. The adsorption method is low energy consumption and high safety. The treatment process is non-toxic and easy to operate, has a good application prospect, and has become a hot spot in current environmental research.

[0004] Adsorption is a mass transfer process that occurs on the surface of a substance. It is mainly realized by the interaction between adsorbate molecules and adsorbent surface molecules. It is divided into physical adsorption and chemical adsorption. Humic acid has phenolic hydroxyl, carboxyl, alcohol Macromolecular polycyclic aromatic compounds with multiple functional groups such as hydroxyl groups. Studies have shown that amino-based adsorbents have a better adsorption effect on humic acid, which mainly relies on the carboxyl and alcohol dissociated from the amino group on the surface of the adsorbent and humic acid. Hydroxyl groups are combined by electrostatic interaction. At present, the amine-based adsorbents used to adsorb humic acid in water mainly include chitosan, polypyrrole, and amino-modified polyacrylonitrile. The effect is good, but the difficulty in separating the adsorbent after adsorption limits its application