An adsorption resin for o-diphenylamine wastewater treatment and a preparation method thereof

CN122321837APending Publication Date: 2026-07-03ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
Filing Date: 2026-05-26
Publication Date: 2026-07-03

AI Technical Summary

Technical Problem

Existing technologies for treating o-phenylenediamine wastewater suffer from incomplete removal of molecularly imprinted resin templates, insufficient internal cross-linking of the resin, low specific surface area, and insufficient functional group activity, resulting in limited adsorption capacity. Furthermore, the inorganic nanomaterial composite system exhibits poor stability, making it difficult to meet the industrial requirements for high-concentration o-phenylenediamine wastewater.

Method used

A composite functional adsorption system was constructed by coating mesoporous silica nanocages with sulfate-oxygen vacancy cerium-zirconium-titanium composite oxides and supporting hydrated zirconium oxide nanosheets with phosphotungstate-molybdate double-intercalated magnesium-aluminum-iron layered double hydroxides. Through hydrogen bonding and electrostatic interactions, o-phenylenediamine template complexes were formed. Combined with the hypercrosslinked network and hierarchical porous structure, o-phenylenediamine was efficiently adsorbed.

Benefits of technology

It significantly improves the adsorption capacity and selectivity of organic pollutants in o-phenylenediamine wastewater, enhances the adsorption capacity, solves the stability and selectivity problems of adsorption resins in existing technologies, and meets the industrial treatment needs of high-concentration o-phenylenediamine wastewater.

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Abstract

This invention belongs to the field of wastewater treatment technology, specifically relating to an adsorption resin for treating o-phenylenediamine wastewater and its preparation method. The process involves the dispersion and combination of organic monomers and o-phenylenediamine templates, followed by the coating of mesoporous silica nanocages with a composite sulfate-oxygen vacancy cerium-zirconium-titanium composite oxide and the loading of hydrated zirconium oxide nanosheets with a phosphotungstic acid-molybdate double-intercalated magnesium-aluminum-iron layered double hydroxide to form a composite organic phase, which is then subjected to suspension polymerization to obtain composite porous resin spheres. These spheres are then subjected to template elution, swelling crosslinking, and iminodiacetic acid grafting to acquire stable chelated functional groups on the resin surface, enabling efficient adsorption of o-phenylenediamine from wastewater. The entire process uses commercially available raw materials, controlling the dispersion, polymerization, aging, anion exchange, and grafting temperatures and times to ensure the integrity and functionality of the material structure. The process is simple to operate and industrially feasible, significantly improving the removal efficiency of o-phenylenediamine.

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