数字农科院2.0

Synergistic Fe/Zn co-modification of biochar via salt-assisted rapid microwave heating for efficient hexavalent chromium removal

文献类型： 外文期刊

作者： Xiaowei Wang;Yilu Zhang;Lichun Dai;Liang Fang;Zeeshan Asghar;Manli Lin;Weihua Peng;Jinpeng Jia;Jianhua Hou

作者机构：

关键词： Bimetallic oxide;Cr (Ⅵ) removal;Microwave-induced heating;Okara biochar;Wastewater

期刊名称： Colloids and Surfaces A: Physicochemical and Engineering Aspects

ISSN： 0927-7757

年卷期： 2026 年 736 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： In this study, a co-modification strategy utilizing the synergistic effects of ZnCl2 and FeCl3 under salt-assisted microwave heating is proposed as an ultrafast and efficient route for biochar preparation, with the entire heating process completed within 200 s. Among the prepared composites, BC-Fe0.5Zn1.0 exhibited the best overall performance, featuring a hierarchical micro–mesoporous structure and an ultrahigh surface area (872 m2·g−1). As a result, it achieved a maximum Cr (VI) adsorption capacity of 253 mg·g−1, far exceeding those of single-metal-activated biochars. Mechanistic analyses revealed that Cr (VI) removal proceeded via a synergistic adsorption–reduction pathway involving electrostatic attraction, pore-assisted diffusion, Fe2+ mediated reduction, and surface complexation. ZnCl2 mainly promoted pore development and surface area enhancement, while Fe3O4 and ZnFe2O4 facilitated redox reactions and stabilized Cr (III) binding, enabling efficient Cr (VI)-to-Cr (III) transformation. The material retained over 45 % of its adsorption capacity after four regeneration cycles and exhibited good resistance to coexisting ions. Moreover, this microwave-assisted heating strategy has been successfully extended to other biomass raw materials, demonstrating good universality and scalability. This work provides an ultrafast, energy-efficient, and generalizable approach for producing high-performance biochar for heavy-metal-contaminated wastewater treatment.

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