Coaxial flow focusing core-shell structure biochar composite filter material, and preparation method and application thereof
By constructing a core-shell structured biochar/calcium alginate composite filter media using coaxial flow focusing technology, the problems of particle size control and low production efficiency are solved, enabling efficient encapsulation and recycling of biochar, which is suitable for road runoff pollution treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-22
- Publication Date
- 2026-07-17
AI Technical Summary
The existing biochar/calcium alginate composite filter media has difficulties in particle size control, forming specific structures, and low production efficiency. Furthermore, powdered biochar is difficult to recycle, which limits its application in road runoff treatment.
Using coaxial flow focusing technology, the inner phase biochar suspension and the outer phase sodium alginate solution are coaxially laminarly flowed. The outer phase encapsulates the inner phase and undergoes ionic cross-linking reaction in calcium chloride solution to form a core-shell structured biochar/calcium alginate composite filter material.
The preparation of composite filter media with uniform particle size and good sphericity has been achieved, which maintains the adsorption performance of biochar, solves the problem of difficult recycling of powdered biochar, and the preparation process is continuous and controllable, making it suitable for industrial production.
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