Biogenic Palladium Improved Perchlorate Reduction during Nitrate Co-Reduction by Diverting Electron Flow in a Hydrogenotrophic Biofilm

文献类型： 外文期刊

第一作者： Zhou, Jingzhou

作者： Zhou, Jingzhou;Yang, Lin;Li, Xiaodi;Dai, Ben;He, Junxia;Xia, Siqing;Zhou, Jingzhou;Yang, Lin;Li, Xiaodi;Dai, Ben;He, Junxia;Xia, Siqing;Wu, Chengyang;Pang, Si;Rittmann, Bruce E.

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关键词： palladium nanoparticles; Pd-catalyzed reduction; intracellular electron transfer; perchlorate reduction

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：11.4； 五年影响因子：12.0 ）

ISSN： 0013-936X

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Microbial reduction of perchlorate (ClO4-) is emerging as a cost-effective strategy for groundwater remediation. However, the effectiveness of perchlorate reduction can be suppressed by the common co-contamination of nitrate (NO3-). We propose a means to overcome the limitation of ClO4- reduction: depositing palladium nanoparticles (Pd(0)NPs) within the matrix of a hydrogenotrophic biofilm. Two H-2-based membrane biofilm reactors (MBfRs) were operated in parallel in long-term continuous and batch modes: one system had only a biofilm (bio-MBfR), while the other incorporated biogenic Pd(0)NPs in the biofilm matrix (bioPd-MBfR). For long-term co-reduction, bioPd-MBfR had a distinct advantage of oxyanion reduction fluxes, and it particularly alleviated the competitive advantage of NO3- reduction over ClO4- reduction. Batch tests also demonstrated that bioPd-MBfR gave more rapid reduction rates for ClO4- and ClO3- compared to those of bio-MBfR. Both biofilm communities were dominated by bacteria known to be perchlorate and nitrate reducers. Functional-gene abundances reflecting the intracellular electron flow from H-2 to NADH to the reductases were supplanted by extracellular electron flow with the addition of Pd(0)NPs.

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