An organically modified bentonite and a method for preparing the same

CN120903517BActive Publication Date: 2026-05-26ZHEJIANG HONGYU NEW MATERIALS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG HONGYU NEW MATERIALS
Filing Date
2025-07-03
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Traditional bentonite modification methods suffer from problems such as small interlayer spacing, low specific surface area, hydrophilicity and oleophobicity, lack of multi-level pore structure, and structural instability, which limit their application in the adsorption of organic pollutants and in complex environments.

Method used

Organically modified bentonite was prepared by synergistic modification of bentonite with 3-aminopropyltriethoxysilane and polyethylene glycol diacrylate, combined with Pluronic F127 template agent to construct a three-dimensional network structure and multi-level channels, and through acidification, sodiumization and hydrothermal reaction.

Benefits of technology

It significantly improves the adsorption capacity and diffusion rate of bentonite for organic pollutants, enhances the structural stability and specific surface area of ​​the material, realizes a composite structure of mesoporous and macroporous structures, expands the applicable pH range, and reduces waste liquid discharge.

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Abstract

This invention relates to the field of bentonite preparation technology, and in particular to an organically modified bentonite and its preparation method, comprising the following steps: (a) pretreatment of natural bentonite by sulfuric acid acidification and whitening; (b) sodium carbonate sodiumization to obtain sodium-based bentonite; (c) dispersion of sodium-based bentonite in anhydrous ethanol, addition of 3-aminopropyltriethoxysilane (APTES) and polyethylene glycol diacrylate (PEGDA), and reflux reaction at pH=4.0 to achieve silanization intercalation; (d) addition of 5% template agent, and hydrothermal construction of mesoporous-macroporous hierarchical channels at 120℃; (e) elution of template agent with ethanol / water mixed solvent, and drying and pulverizing to obtain the finished product. This method overcomes the defects of traditional bentonite in low mass transfer efficiency and insufficient macromolecular adsorption capacity, and can increase the adsorption capacity for organic pollutants by more than 40%, while enhancing the structural stability under high temperature and acidic environments.
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