Preparation method and application of lignin-based carbon aerogel catalyst

By using lignin-based carbon aerogel catalysts to achieve rapid adsorption and complete degradation of formaldehyde at room temperature, this method solves the problems of high material costs and easy secondary pollution in existing technologies, and provides an efficient and stable formaldehyde purification solution.

CN122230722APending Publication Date: 2026-06-19ZHEJIANG FORESTRY UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG FORESTRY UNIVERSITY
Filing Date
2026-02-06
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing formaldehyde purification technologies suffer from high material costs, high energy consumption, and susceptibility to secondary pollution. Furthermore, existing biomass-based carbon materials have limited functionality or deviate from their intended purpose, failing to achieve efficient and stable room-temperature self-driven catalytic degradation.

Method used

Using a lignin-based carbon aerogel catalyst, formaldehyde is rapidly adsorbed through its well-developed porous structure and then catalytically oxidized to carbon dioxide and water in situ at room temperature using metal active sites. Combined with ion crosslinking and resin reinforcement, a stable carbon framework is constructed, achieving a seamless connection between adsorption and degradation.

Benefits of technology

It achieves efficient adsorption and complete degradation of formaldehyde at room temperature, reduces material costs, avoids secondary pollution, and the catalyst has long-term stability and environmental friendliness.

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Abstract

This invention discloses a method for preparing a lignin-based carbon aerogel catalyst, comprising the following steps: S1. Dissolving lignin and sodium alginate in deionized water and stirring to form a mixed solution; S2. Slowly dripping the mixed solution from step S1 into purified wastewater containing metal ions using a peristaltic pump, and then performing a cross-linking polymerization reaction to obtain wet gel spheres; S3. Dissolving phenolic compounds and aldehyde precursors in deionized water to obtain a phenolic resin precursor solution; S4. Adding the cross-linked wet gel spheres to the phenolic resin precursor solution, aging to obtain a lignin-based composite wet gel, followed by freeze-drying and constant temperature treatment at 300-800°C for 1-3 hours under inert gas protection to obtain the lignin-based carbon aerogel catalyst. The lignin-based carbon aerogel catalyst of this invention can achieve highly efficient integrated adsorption-degradation formaldehyde purification at room temperature, with a degradation rate exceeding 60%, and a long catalyst lifespan.
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