Preparation method and application of a double network gel adsorbent for treating heavy metal wastewater

Abstract

The invention provides a preparation method and application of a heavy metal adsorber. The preparation method includes preparing gel from agar and acrylic acid through a one-step sol-gel method, and preparing double-network gel with super-strong mechanical performance and excellent removal effect on heavy metal from the gel with epichlorohydrin as a cross-linking agent and triethylene tetramine as a crosslinker through amino functional modification. Of a three-dimensional network porous structure, the double-network gel has high osmotic pressure and is capable of adsorbing heavy metal ions in a solution rapidly; all adsorption sites in the network structure can be exposed sufficiently, and accordingly the double-network gel is high in adsorption capacity; through two network interpenetration structures and the effect of negative and positive ions on static electricity, the mechanical performance of the gel is enhanced greatly, and the gel can be separated from the adsorbed solution directly to achieve rapid and effective recovery of the adsorber. The preparation method is simple in preparation, free from restrictions of extreme experiment conditions and capable of treating wastewater containing Cd (II) or other heavy metals.

Description

technical field

[0001] The invention designs the preparation of a double-network gel adsorbent and its application to the removal of heavy metals. Background technique

[0002] The treatment of heavy metal ions in industrial wastewater has increasingly attracted the attention of researchers at home and abroad. From the perspective of practical application, many commonly used adsorbents still have many shortcomings, such as granular adsorbents such as activated carbon and chelating resin, whose small pore structure and hydrophobic skeleton structure make metal ions diffuse inside The phase rate is low; for nano-adsorption materials, although they have a faster adsorption rate and a larger adsorption capacity, they are difficult to reuse and are prone to toxic sludge. Therefore, adsorbents with the advantages of low cost, high adsorption performance, easy separation, and reusability are urgently needed in the water treatment process.

[0003] The double-network gel contains ...

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