Aluminum-based MOFs/chitosan composite microsphere and preparation method and application thereof

Abstract

The invention belongs to the field of environmental science and engineering and discloses an aluminum-based MOFs / chitosan composite microsphere and a preparation method and application thereof. The problem is solved that the adsorption capacity is reduced after existing MOFs forming. An aluminum-based MOFs material MIL-68(Al) serves as a matrix, the composite microsphere coated with chitosan on the surface is obtained under the combined cross-linking action of sodium alginate and chitosan, the particle size of the microsphere is about 2 mm, and the microsphere is easy to separate and recycle from water. The preparation method is simple in operation process, relatively low in requirement on equipment conditions and easy to implement; the aluminum-based MOFs / chitosan composite microsphere can achieve the removal efficiency equivalent to that of powder MOFs, bisphenol A in a water body can be efficiently adsorbed and removed, and an adsorption material can be quickly separated and recycled from the water body.

Description

technical field [0001] The invention belongs to the field of environmental science and engineering, and specifically relates to an aluminum-based MOFs / chitosan composite microsphere and a preparation method and application thereof. Background technique [0002] With the development of social industry and the improvement of people's living standards, environmental problems have become increasingly prominent, among which water pollution has become an important factor restricting the sustainable development of human economy. Environmental endocrine disrupting substances (EEDs) are highly toxic and difficult to degrade. They are the focus of current environmental problems and have a great impact on the ecological environment and human health. Bisphenol A is a typical environmental endocrine disrupting substance that exists in water bodies. The concentration in the environment increases year by year, and it can enter the water environment through various channels and cause pollut...

AI Technical Summary

Problems solved by technology

However, these traditional adsorbents have some defects when used to treat bisphenol A in water, such as poor selectivity, low adsorption efficiency, and most of them have high preparation costs and complicated processes.

[0004] In recent years, due to the high specific surface area, high porosity, porosity, and adjustable functions of MOFs materials, more and more researchers have attracted more and more researchers to use MOFs as adsorbents to treat pollutants in water bodies. There are still the following problems when MOFs materials are applied to water bodies: (1) MOFs generally exist in the form of nanoparticles, so it is not easy to separate and recover in liquid phase adsorption; (2) Although MOFs can be used for liquid phase adsorption after molding It is easier to recycle and separate, but it will lead to a decrease in the adsorption performance of MOFs

Images