Preparation method of sodium alginate/chitosan hydrogel microspheres for heavy metal arsenic adsorption

Abstract

The invention relates to a preparation method of sodium alginate / chitosan hydrogel microspheres for heavy metal arsenic adsorption. The preparation method comprises the following steps of (a) selecting 1 to 5 percent of carboxymethyl chitosan solution and 1 to 5 percent of sodium alginate solution, and mixing according to the volume ratio of 1:(1 to 8) so as to obtain a mixed solution; (b) dropwise adding the mixed solution into 1 to 20 percent of CaCl2 solution, stirring with a rotation speed of 800 to 1200rpm for 20 min to 100 min at 30 to 80 DEG C, collecting small spheres, washing throughdistilled water for multiple times, and freeze drying or vacuum drying to obtain the hydrogel microspheres. The preparation method of the sodium alginate / chitosan hydrogel microspheres for heavy metalarsenic adsorption has the characteristics that the preparation process is simple, the raw material source is wide, harmful heavy metal in sewage can be adsorbed and conveniently removed, and the economic benefit and the social benefit of enterprises are improved.

Description

technical field [0001] The invention relates to a method for preparing sodium alginate / chitosan hydrogel microspheres used for the adsorption of heavy metal arsenic, and belongs to the technical field of preparation of adsorbents for sewage treatment. Background technique [0002] With the intensification of environmental pollution caused by industry, water pollution has become a global problem, and water treatment has become the focus of environmental protection work in all countries in the world. [0003] At present, there are many methods to deal with heavy metals, including: coagulation precipitation method, adsorption method, oxidation method, ion exchange method, membrane separation method, biological method, photochemical technology, etc. But for the treatment of drinking water, because the content of these harmful ions is usually very low, the application of many methods is limited, such as the coagulation sedimentation method is more suitable for sewage treatment; t...

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Problems solved by technology

But for the treatment of drinking water, because the content of these harmful ions is usually very low, the application of many methods is limited, such as the coagulation sedimentation method is more suitable for sewage treatment; the redox method must be used continuously and some oxidants also pollute the water ; The biological method takes a long time to be effective; the ion exchange method and the membrane separation method are costly; the photocatalytic method relies on light source and other equipment and the cost of preparing the catalyst is relatively high