Rapid, selective surface oxygenation of activated biochar via microwave-induced air oxidation shock toward organic pollutant adsorption and electrochemical energy storage

文献类型： 外文期刊

第一作者： Zhou, Haiqin

作者： Zhou, Haiqin;Dai, Lichun;Zhou, Haiqin;Dai, Lichun;Hou, Jianhua;Kong, Lingzhao;Yang, Bo

作者机构：

关键词： Microwave; Air oxidation; Activated biochar; Surface functionality; Organic pollutant adsorption; Electrochemical energy storage

期刊名称：SUSTAINABLE MATERIALS AND TECHNOLOGIES （ 影响因子：9.2； 五年影响因子：9.8 ）

ISSN： 2214-9937

年卷期： 2025 年 44 卷

页码：

收录情况： SCI

摘要： Oxidation is a commonly used strategy to enhance the surface functionality of biochar. Disappointingly, oxidation always enriches high polarity poor-capacitance O-C=O groups (i.e., carboxyl/lactone) on the carbon material surface, which act as a double-edged sword for biochar's application in organic pollutant adsorption and electrochemical energy storage. Herein, microwave-induced air oxidation shock (MW-AOS) is proposed as a rapid and simple strategy to selectively oxygenate the surface of activated biochar (AB). Characterization results show that the surface of the pristine AB is remarkably oxygenated from 3.8 % to 11.8 % after MW-AOS at an output power of 800 W for 15 s. Interestingly, surface oxygenation is achieved while reducing the high-polarity poor-pseudocapacitance O-C=O groups (i.e., carboxyl/lactone) is selectively achieved at a shorter irradiation time (15 s). Batch adsorption results indicate that MW-AOS remarkably increases the adsorption of various organic pollutants (dyes and antibiotics) by AB. Electrochemical analysis reveals that the specific capacitance of the AB is improved by 250 % (from 60 to 208 F/g at 1 A/g after AOS at 800 W for 15 s), attributed to reduced electrical resistance and enhanced ion transport. Finally, this study could pave a new route for the surface engineering of AB for these applications.

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