Biochar composite material as well as preparation method and application thereof

By modifying biochar, polyurethane network and modified iron tailings composite material to form a core-shell structure, the problems of easy loss of water-retaining agent and weak soil binding force in the existing technology are solved. This achieves high water absorption, mechanical strength and microbial activity, and improves soil structure and pollutant adsorption capacity.

CN122080947APending Publication Date: 2026-05-26NINGXIA UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NINGXIA UNIVERSITY
Filing Date
2026-02-12
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing technologies, water-retaining agents are easily lost, have weak soil binding force, and have high costs for stratified improvement. A single water-retaining agent cannot simultaneously achieve mechanical support, water regulation, and enhancement of microbial activity. Pure biochar particles cannot form a stable structure and are difficult to improve soil structure.

Method used

Modified biochar, polyurethane network, and modified iron tailings composite material are used. A three-dimensional network structure is formed by crosslinking chitosan with graphene oxide. Combined with modified cellulose-acrylic acid copolymer and polyurethane coating material, a core-shell structure is formed, which achieves high water absorption and mechanical strength. Modified iron tailings provide catalytic activity, forming a stable soil amendment material.

Benefits of technology

It significantly improves the adsorption capacity and selectivity for a variety of pollutants, enhances mechanical strength and structural stability, extends the service life of water-retaining agents, improves soil structure and microbial activity, enables the controlled release of water and nutrients, and reduces environmental pollution.

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Abstract

The invention relates to the technical field of biochar composite materials, in particular to a biochar composite material as well as a preparation method and application thereof. Comprising the following components in parts by weight: 10-15 parts of a composite adsorbent, 20-55 parts of modified charcoal, 50-96 parts of a castor oil-based polyurethane coupling water-retaining agent, 5-12 parts of modified iron tailings, 0.5-2 parts of a cross-linking agent and 0.5-1.5 parts of an initiator. In the prepared biochar composite material, the modified biochar provides adsorption sites, the polyurethane network realizes high water retention, the modified iron tail provides catalytic activity, the whole biochar composite material can be further used for soil improvement at the same time, the biochar composite material has high specific surface area and rich surface functional groups, and the formed water retention network maintains a local moist environment, so that the biochar composite material can be applied to soil improvement. And microbial attachment and pollutant biodegradation are facilitated.
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