文献类型： 外文期刊

作者： Zhou, Jingzhou ¹ ; Yang, Lin ¹ ; Li, Xiaodi ¹ ; Dai, Ben ¹ ; He, Junxia ¹ ; Wu, Chengyang ³ ; Pang, Si ⁴ ; Xia, Siqing ¹ ; Rittmann, Bruce E. ⁵ ;

作者机构： 1.Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China

2.Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

3.Univ Shanghai Sci & Technol, Sch Environm & Architecture, Shanghai 200093, Peoples R China

4.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China

5.Arizona State Univ, Biodesign Swette Ctr Environm Biotechnol, Tempe, AZ 85287 USA

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.