Porous hydrogel as well as preparation method and application thereof

Abstract

The invention discloses a porous hydrogel as well as a preparation method and application thereof. The preparation method comprises the following steps: step A, respectively adding Tween 80 and hydrophilic SiO2 nanoparticles into deionized water, and uniformly mixing to obtain a mixed system A; step B, sequentially adding a monomer raw material, a cross-linking agent and an initiator into the mixed system A, and performing ultrasonic dissolution to obtain a mixed system B; step C, adding oil phase cyclohexane into the mixed system B in batches, and carrying out oscillation emulsification to obtain a high internal phase emulsion; and D, heating the high internal phase emulsion in a water bath, ventilating after the water bath is finished, and washing with absolute ethyl alcohol to obtain the porous hydrogel. The porous hydrogel prepared by the method is applied to enrichment or separation of heavy metal ions. The porous hydrogel prepared by the method has the advantages of rapid water absorption, high water absorption rate and the like, and can be used for enrichment or separation of heavy metal ions.

Description

Technical field [0001] The present invention relates to the technical field of porous hydrogel preparation. Specifically, it is a porous hydrogel and a preparation method thereof and a use. Background technique [0002] Hydrogel is a high water content material having a three-dimensional crosslinked network that can significantly swell in water and maintain its original structure and performance, having a large adsorption capacity, fast speed, high removal rate, easy to desorption, raw materials, and environment Friendly, etc., suitable for low concentration heavy metal ions. If the porous structure is introduced into the hydrogel structure, the adsorption and separation effect of the hydrogel to heavy metal ions can be significantly enhanced, exhibiting excellent application potential. [0003] High Internal Phase Emulsions, Hipes is a continuous phase of the aqueous solution of monomers, and the organic solvent is a dispersed phase, which is a stable high inner phase emulsion i...

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Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to provide a kind of porous hydrogel and its preparation method, to make up for the shortcomings of the hydrogel prepared by the existing preparation method, such as large average pore size and low porosity, and solve the problem of existing hydrogel The problem of poor water absorption and water absorption rate; at the same time, the use of porous hydrogel is also provided, that is, the porous hydrogel is used for the enrichment and separation of heavy metal ions, so as to solve the problem of heavy metal ion in the hydrogel prepared by the current method. Unsatisfactory performance in enrichment and separation

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