Promoting interspecies hydrogen/electron transfer in Bio-PdNPs-mediated denitrification with the selectivity towards N2

被引：19

作者：

Bi, Sijing ^{[1
]}

Liu, Huimin ^{[1
]}

Chen, Yuancai ^{[1
]}

Hu, Yongyou ^{[1
]}

机构：

[1] South China Univ Technol, Sch Environm & Energy, Minist Educ, Key Lab Pollut Control & Ecol Remediat Ind Agglom, Guangzhou 510006, Peoples R China

来源：

BIOCHEMICAL ENGINEERING JOURNAL | 2022年 / 181卷

基金：

中国国家自然科学基金;

关键词：

Biosynthetic nano -palladium; Denitrification mechanism; Interspecies electron/hydrogen transfer ( IHT/IET); Microbial community; ELECTRON-TRANSFER; PALLADIUM NANOPARTICLES; CATALYTIC-REDUCTION; NITRITE REDUCTION; NITRATE; MECHANISM; DEGRADATION; RIBOFLAVIN; EXCHANGE; REMOVAL;

D O I：

10.1016/j.bej.2022.108395

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

The palladium nanoparticles (Bio-PdNPs) were in-situ biosynthesized in denitrifying sludge at three Pd loading levels, and the denitrification performance was evaluated in terms of interspecies hydrogen/electron transfer (IHT/IET) and their pathway for the first time. The results showed that high selectivity towards N-2 (76.96%, 97.10% and 99.30%) were observed when conventional denitrifying sludge was embedded with appropriate amount of Bio-PdNPs at three C/N ratios (3, 7 and 10), respectively. In-situ fermented hydrogen could be consecutively provided for IHT at low H/N ratio, avoiding the production of NH4+. IHT related with Pd[H] mainly catalyzed the enzymic/nonenzymic transformation of NO2-, NO and N2O, in which NO could be directly/ abiotically cracked to N-2 and O-2/H2O. Moreover, IET was greatly accelerated via the bounded flavin (FBcyt) and cytochrome, riboflavin, as well as electron hopping. Nevertheless, enzymatic denitrification was depressed with excess Bio-PdNPs (Bio-PdNPs-10). This study shed light on IET/IHT and denitrification pathway in Bio-PdNPs-mediated denitrification system, and provided basis for engineering practice.

引用

页数：11

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