Porous charcoal adsorbent based on synergistic modification of polyphosphonic acid compound and alkali as well as preparation method and application of porous charcoal adsorbent

The preparation method of biochar by synergistic modification with polyphosphonic acid compounds and alkali solves the problem of biochar modification being difficult to balance high specific surface area and mesoporous structure, and achieves efficient adsorption of drugs and personal care products, which is suitable for the deep purification of water pollutants.

CN122352199APending Publication Date: 2026-07-10HARBIN INST OF TECH
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Patent Information

Application Number
CN202610319469.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-16
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing biochar modification methods struggle to simultaneously increase specific surface area while constructing mesoporous structures suitable for macromolecular diffusion and introducing targeted surface functional groups, resulting in low adsorption capacity for pharmaceutical and personal care product contaminants.

Method used

A method of synergistic modification with polyphosphonic acid compounds and alkali was adopted. Biomass was first pretreated with polyphosphonic acid compounds and then activated with alkali. The reaction conditions were controlled to achieve slow formation and controllable breaking of COP bonds, thereby constructing a hierarchical porous structure and uniform phosphorus-containing functional groups.

Benefits of technology

A porous biochar adsorbent with ultra-high specific surface area and rich hierarchical pore structure was prepared, which significantly improved the adsorption capacity for pollutants such as ciprofloxacin, acetaminophen, and tetracycline, and is suitable for the deep purification of pharmaceutical wastewater, medical wastewater and surface water.

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Abstract

The invention relates to a porous charcoal adsorbent based on synergistic modification of a polyphosphonic acid compound and alkali as well as a preparation method and application of the porous charcoal adsorbent. The method comprises the following steps: mixing biomass powder with a polyphosphonic acid compound solution, dipping, drying, and carrying out first pyrolysis to obtain polyphosphonic acid modified biochar; mixing the polyphosphonic acid modified biochar with an alkali solution, dipping, drying, carrying out second pyrolysis, and finally carrying out acid pickling, water washing and drying to prepare the porous biochar adsorbent based on synergistic modification of the polyphosphonic acid compound and alkali. The porous biochar adsorbent obtained by the invention has an ultrahigh specific surface area and a rich micro-mesoporous hierarchical structure, is rich in phosphorus functional groups (C-O-P and O-P) on the surface, and shows excellent adsorption capacity and removal efficiency on drugs such as ciprofloxacin, paracetamol, tetracycline and the like and personal care product pollutants in a water body; the method is suitable for deep purification of trace new pollutants in pharmaceutical wastewater, medical sewage and surface water, and has a remarkable application prospect.
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