数字农科院2.0

Insight into the crucial role of nano-biochar in the natural formation and bioaccumulation of silver nanoparticles in the rhizosphere by single-particle ICP-MS

文献类型： 外文期刊

作者： Shiguo Gu;Binbin Sun;Fei Wang;Wei Zhu;Fei Lian;Jie Li

作者机构：

关键词： Ag+;Nano-BC;Reduction mechanism;Rhizosphere;Silver nanoparticle

期刊名称： Biochar

ISSN： 2524-7867

年卷期： 2025 年 7 卷 1 期

页码：

收录情况： SCIE（2025版） ; ; CSCD（2025-2026年度） ; ; 农林核心（2024版）

摘要： Nano-biochar (nano-BC) is one of the most active fractions in the BC continuum and frequently detected in terrestrial ecosystems. However, a paucity of information exists on reactivity and environmental functions of nano-BC in the rhizosphere. The present study investigated the potential of nano-BC in transforming silver ions (Ag+) to silver nanoparticles (AgNPs) in the rhizosphere of rice. We found that the synergistic effect of nano-BC and dioxygen secreted from rice roots was essential for Ag⁺ reduction to AgNPs. In this process, nano-BC transferred electrons to dioxygen, resulting in the formation of superoxide free radicals, which subsequently donate electrons to Ag+. Notably, excess nano-BC was unfavorable to dioxygen secretion from roots and thus inhibited the formation of AgNPs. Our results highlight that although nano-BC significantly decreased the uptake of Ag by rice plants, it contributed to the accumulation of AgNPs in plant tissues. TEM and single-particle ICP-MS analyses confirmed the presence of AgNPs not only in intercellular spaces of leaf tissues but also within the interior of leaf cells. These findings indicate that nano-BC plays a critical role in regulating the chemical species and bioaccumulation of redox-active metals (such as Ag) in the rhizosphere, which has important implications for element cycling from the pedosphere to terrestrial vegetation and warrants further investigation.

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