数字农科院2.0

Sustainable removal of methylene blue and arsenic co-pollutants from wastewater using a novel Ferrihydrite@mushroom substrate biochar composite

文献类型： 外文期刊

作者： Liu, Yong;Wang, Zhiqiao;Ma, Jie;Zhang, Xiaoyu;Feng, Bingcong;Sun, Yixuan;Zhao, Yujie;Weng, Liping

作者机构：

关键词： Biochar;Agricultural waste;Organic pollutant;Heavy metals;Degradation

期刊名称： JOURNAL OF WATER PROCESS ENGINEERING

ISSN： 2214-7144

年卷期： 2025 年 79 卷

页码：

收录情况： SCIE（2025版）

摘要： The coexistence of organic pollutants and heavy metals in the environment poses substantial remediation challenges because of the distinct physicochemical properties of these pollutants. Herein, we developed a novel biochar composite (BF) through the immobilization of ferrihydrite (FH) on mushroom stem-derived biochar (BC) to simultaneously remove methylene blue (MB) and arsenic. Systematic investigations combining adsorption kinetics, electron paramagnetic resonance spectroscopy, and X-ray photoelectron spectroscopy revealed that immobilized FH facilitated Fe3+/Fe2+ redox cycling through interfacial electron transfer with conductive BC, sustaining catalytic activity in H2O2 activation and hydroxyl radical (center dot OH) generation, resulting in 100 % MB degradation. At the same time, the addition of ethanol to the system resulted in considerable inhibition of MB degradation, with the degradation rate decreasing by approximately 84 % within 24 h, which verified that oxidation by & sdot;OH is the primary mechanism of MB degradation. The exceptional stability of BF (92.7 % MB degradation after 7 degradation-regeneration cycles) was attributed to the BC-mediated suppression of iron leaching. In the column experiment, BF simultaneously removed MB and As (including As(III) and As(V)), but the MB degradation rate (by 50 %-80 %) with increasing As concentration, indicating competition between the removal of these two pollutants. This work innovatively uses agricultural waste as the raw material for the remediation of dye-heavy metal combined pollution, providing insights into the removal mechanism and highlighting the potential of iron-BC composites in addressing complex pollution.

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