Preparation method of ethanediamine based porous dextrangel adsorbent

Abstract

The invention discloses a preparation method and an application of an ethanediamine based porous dextrangel adsorbent. The preparation method comprises the following steps: immersing the dextrangel in de-ionized water, freezing rapidly, treating by using NaOH solution; oxidizing by epoxy chloropropane to obtain epoxy porous dextrangel; then, stirring sodium carbonate, ethanediamine, absolute ethyl alcohol and epoxy porous dextrangel at the constant temperature of 60+ / -2 DEG C, carrying out backflow reaction for 2-4h, cooling, washing by using de-ionized water, carrying out suction filtering until the filtrate is neutral, washing by using a small amount of ethanol, drying in vacuum, so as to obtain the ethanediamine based porous dextrangel adsorbent. The preparation method is simple, the specific area is large, the number of quadrol groups is high, the adsorbing capacity to heavy metal is high; the dextrangel has the characteristics of light weight, low cost, good stability, degradability, environment friendliness and the like; the adsorbent provided by the invention has excellent effects when used for heavy metal treatment in wastewater and heavy metal separation and enrichment in analytical chemistry.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of an ethylenediamine-based porous dextran gel adsorbent and an application technology for adsorbing heavy metal ions in water treatment. Background technique [0002] With the advancement of science and technology and the rapid development of industry and agriculture, people's material living standards continue to improve, global environmental pollution is increasing, and environmental protection and environmental governance issues have received more and more attention from all walks of life. One of the important pollution sources of polluting environmental water quality is heavy metal ions in industrial wastewater. Heavy metal wastewater mainly comes from mechanical processing, mining, smelting of non-ferrous metals and chemical enterprises. Compared with other pollutants, heavy metal pollution has its uniqueness. One is toxic, can caus...

AI Technical Summary

Problems solved by technology

The modification of organic polymer materials such as cellulose, starch, and chitosan with ethylenediamine and its application have been reported, such as: the adsorption performance of ethylenediamine-modified starch GMA copolymer to Pb(Ⅱ), and its adsorption to lead ions. The capacity is 0.481 mol / g, (Xie Guoren et al., Acta Chemical Industry, 2011, 62 (4): 970~975); the preparation and adsorption performance of ethylenediamine chelated cotton fiber, its effect on Cu 2+ 、Cd 2+ The adsorption capacities of ethylenediamine-modified chitosan on Cu(Ⅱ) were 5.15 mg / g and 4.96 mg / g respectively (Lian Hongfang et al., Chemical Environmental Protection, 2004, 24 (Supplement): 368~370); , (Ge Huacai et al., Guangdong Chemical Industry, 21012, 39 (13): 181~182); Ethylenediamine silica gel composite material on Zn 2+ Adsorption characteristics of Co 2+ , its maximum adsorption capacity for cobalt ions reaches 50.0 mg / g, (Zhuang Jianping, Chemical Engineering and Equipment, 2011, (9): 12~15); preparation of ethylenediamine chelated bacterial cellulose and its adsorption of Cu 2+ research, its effect on Cu 2+ The adsorption capacity is 8.68 mg / g, (Ma Bo et al., Industrial Water Treatment, 2009, 29 (7): 60~62); these ethylenediamine-modified polymer materials have better adsorption effects on heavy metal ions, However, its mechanical properties are relatively poor, it is difficult to recycle in wastewater treatment, and its repeated use rate is low.

There are also related reports on modifying inorganic materials with ethylenediamine functional groups, such as: study on the adsorption of crystal violet on naphthaleneethylenediamine hydrochloride modified bentonite (Ma Tongsen et al., Henan University Journal (Natural Science Edition), 2011, 41 (6): 583 ~587); the mechanical properties of ethylenediamine-modified inorganic materials are better than those of high-resolution materials, but it is not easy to recycle in wastewater, and it is easy to be taken away in discharged wastewater

[0005] The dextran gel is fully soaked in water for activation, freezing, alkalization, and modified with ethylenediamine to prepare ethylenediamine-based porous dextran gel. Since the porous dextran gel has a larger specific surface area, the connection is more efficient. Polyethylenediamine groups, which have the advantages of good mechanical properties of inorganic materials and all the advantages of organic materials. At present, there are no reports on the preparation method and application of ethylenediamine-based porous dextran gels.