Electron transfer function of biochar-EPS complex enhances fungal resistance to copper toxicity: mechanisms of oxidative detoxification and mineralization acceleration
文献类型： 外文期刊
第一作者： Song, Wenjing
作者： Song, Wenjing;Chen, Haoming;Song, Wenjing;Zhao, Fangzhou;Chen, Haoming;Hu, Yishu;Zhu, Chun;Huo, Zongli
作者机构：
关键词： Nano biochar; Extracellular polymeric substances; Dual oxidation; Mineral sequestration; Phosphate solubilizing microorganism
期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.4； 五年影响因子：8.6 ）
ISSN： 0301-4797
年卷期： 2025 年 382 卷
页码：
收录情况： SCI
摘要： This study investigated the protection mechanism of biochar to Rhodotorula mucilaginosa under extreme Cu2+ stress. Adding biochar boosted colony-forming units, CO2 emissions and Cu2+ removal by 137 %, 239 % and 64.9 %. Nano biochar particles constructed a protective layer outside the cells. The abundant pores of large particle biochar (micron scale) can adhere microorganisms, together with its rapid adsorption of Cu2+, reducing Cu toxicity. Meanwhile, small particle biochar (nano scale) and EPS form a stable complex state on the cells, and prevent Cu ions from entering the cells. When EPS is separated from microorganisms, Cu-bearing biochar can be discharged. The double oxidation of nano biochar and EPS can reduce the cyclic transformation of Cu2+ and Cu+, thereby reducing the destruction of toxic group (center dot OH) generated by the valence transformation to yeast cells. Ultimately, the biochar's oxidation and passivation process immobilizes Cu2+/+ as stable minerals (Cu-phosphate) to avoid their re-entry into the environment.
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