数字农科院2.0

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

作者： Wenjing Song;Yishu Hu;Fangzhou Zhao;Chun Zhu;Zongli Huo;Haoming Chen

作者机构：

关键词： Dual oxidation;Extracellular polymeric substances;Mineral sequestration;Nano biochar;Phosphate solubilizing microorganism

期刊名称： Journal of Environmental Management

ISSN： 0301-4797

年卷期： 2025 年 382 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

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 (•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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