Dye-adsorbing composite hydrogel microspores and preparation method thereof

Abstract

The invention relates to dye-adsorbing composite hydrogel microspores and a preparation method thereof. The dye-adsorbing composite hydrogel microspores are prepared from sodium alginate, magnesium biphosphate, alumina, attapulgite, calcium nitrate, ammonia water and phosphoric acid. The preparation method comprises (1) preparing sodium alginate solution and magnesium biphosphate solution sequentially with deionized water; (2) mixing the solutions of the step (1), heating to 50 DEG C, and stirring with a magnetic stirrer for 1.5 hours; (3) adding 0.5-1 g of alumina into the mixed liquid of thestep (2) under stirring; (4) adding 1-10 g of attapulgite in an oven with 102 DEG C, drying for 2 hours, adding into the mixed liquid of the step (3) under quick stirring, and continuing to stir for0.5 hour; (5) preparing calcium nitrate solution having the mass concentration of 0.02-0.06 g / ml, dropwise adding the mixed liquid of the step (4) into the calcium nitrate solution through an injectorunder stirring, and continuing to stir the formed hydrogel microspheres in the calcium nitrate solution overnight; (6), filtering the gel of the step (5) through a screen, and washing with deionizedwater 5 times to obtain the composite hydrogel microspheres.

Description

technical field [0001] The invention relates to the field of preparation of a high-strength composite hydrogel, in particular to a microsphere for preparing a dye-absorbing composite hydrogel by using sodium alginate as a raw material and a preparation method thereof. Background technique [0002] Organic dyes are widely used in dyeing, printing and textile industries. In recent years, the rapid growth of the textile industry in developing countries has caused a large amount of dye wastewater to enter natural water bodies without effective treatment, causing harm to the health of aquatic animals and plants and public safety. Methylene blue is the most commonly used cationic organic dye in the printing and dyeing industry, and it is also a major pollutant in printing and dyeing wastewater. When wastewater containing methylene blue comes into contact with the eyes, it can cause irritating inflammation of the eyelids with a strong burning sensation. Acute exposure to methylene...

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Problems solved by technology

[0010] Its disadvantages are: (1) high temperature (85-100°C) is needed to dissolve crosslinking agent (polyvinyl alcohol, sodium alginate) in the production process, which has high energy consumption and high requirements for processing equipment; (2) tannic acid, one of the raw materials, is The water environment has toxic effects, and the waste liquid generated in the production process must be collected uniformly, and the follow-up treatment is complicated; (3) the functional groups on the surface of the prepared gel are single, and the adsorption efficiency is not high; (4) the polyvinyl alcohol gel has high toughness, but the hardness is relatively high Low, poor wear resistance, easy to break, limited application

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