Method for preparing chitosan porous microsphere sorbent by metal ion imprinting and crosslinking methods as well as use

Abstract

The invention discloses a preparation method of a metallic ion blotting crosslinked chitosan porous spherical adsorbent and the application thereof; the method is as follows: the chitosan in solution state and metallic ions jointly form a composition which is prepared into microspheres with diameters from 1.0mm to 10.0mm, the prepared microspheres are treated with pre-crosslinking reaction and then crosslinking reaction in water solution, after crosslinking reaction, the metallic ions and pre-crosslinking agent used for blotting are removed and the metallic ion blotting crosslinked chitosan porous spherical adsorbent is obtained. The method of the invention jointly applies metallic ion blotting and the formaldehyde pre-crosslinking method and matches the technique of solidification and granulation in alkali solution to prepare the metallic ion blotting crosslinked chitosan porous spherical adsorbent with the diameter of 1.0-10.0mm. The spherical adsorbent has large size and high specific surface area, and can be applied to efficient selective separation of heavy metal ions; furthermore, the spherical adsorbent can solve the problems that the existing chitosan microsphere is mostlypowder, and has small size and high resistance to water flows, and the speed of sewage treatment is affected, etc.

Description

Preparation method and application of metal ion imprinted cross-linked chitosan porous microsphere adsorbent technical field The invention relates to a preparation technology of an adsorbent, in particular to a preparation method of a metal ion imprinted cross-linked chitosan porous microsphere adsorbent and an application of the adsorbent. Background technique Wastewater containing heavy metal ions (cadmium, chromium, copper, mercury, cobalt, nickel, etc.) produced in many production processes in mining, iron and steel manufacturing, non-ferrous metal smelting, machinery manufacturing, chemical industry, electronics, instrumentation and other industries is harmful to the water environment. Contaminated heavy metal ions are the main source of pollution. If wastewater and sludge containing heavy metal ions are used for farmland irrigation and fertilization, not only the soil will be polluted, but also the water body will be further polluted, resulting in the accumulation an...

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Problems solved by technology

The embodiment of the present invention provides a preparation method and application of a metal ion imprinted cross-linked chitosan porous microsphere adsorbent, aiming to solve the problems of low adsorption capacity and small size of the existing cross-linked chitosan to heavy metal ions, and to prepare A Spherical Adsorbent Material with Large Size and High Specific Surface Area with Efficient Selective Separation Function for Heavy Metal Ions

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