阿拉丁SCI论文搜索工具

CORROSION SCIENCE · 2025 · IF 8.5

Accelerated degradation of stainless-steel passive film by humic acid-mediated extracellular electron transfer

Yuntian Lou,Shengyu He,Weiwei Chang,Hao Zhang,Jingzhi Yang,Hongchang Qian,Xiangping Hao,Dawei Zhang

The influence of humic acid-mediated extracellular electron transfer (EET) of Shewanella putrefaciens CN32 in microbiologically influenced corrosion (MIC) on 304 stainless steel was investigated. Humic acid plays a key role in accelerating passive film degradation in the presence of S. putrefaciens CN32, with a concentration-dependent effect; but has no effect when alone. It facilitated the formation of larger biofilm and increased Fe and Cr dissolution, resulting in a thinner, weakened passive film and intensified pitting corrosion. In-situ scanning electrochemical microscopy demonstrated S. putrefaciens CN32 utilized humic acid to perform outward EET, injecting electrons into the passive film and accelerating MIC.

CAS / MDL: 7647-01-0

研究领域: 微生物学 · 材料科学 · 电化学

✓ 已验证产品关联 DOI 高影响因子

查看原文查看 PubMed

JOURNAL OF HAZARDOUS MATERIALS · 2021 · IF 10.588

Metagenomic analysis of aromatic ring-cleavage mechanism in nano-Fe3O4@activated coke enhanced bio-system for coal pyrolysis wastewater treatment

Mengqi Zheng,Hongjun Han,Jingxin Shi,Zhengwen Zhang,Wencheng Ma,Chunyan Xu

In current study, nano-Fe 3 O 4 @activated coke enhanced bio-system (FEBS) under limited-oxygen condition was applied for efficient treatment of aromatic organics in coal pyrolysis wastewater. Metagenomic analyses revealed functional microbiome linkages and mechanism involved in aromatic ring-cleavage. Based on biodegradation efficiency in different reactors, FEBS supplementation conferred the best organic removal (avg. 92.29%). It also showed a remarkable advantage in biodegradability maintenance (> 40%) over control reactors. Metagenomics profiling revealed the degradation processes were driven by Fe 3 O 4 redox reactions and microbial biofilm, while the suspended sludge was the principal force for aromatic mineralization . Based on the analysis of functional species and genes, most bacteria cleaved the benzene ring preferably through the aerobic pathways, mediated by catechol 1, 2-dioxygenase, catechol 2, 3-dioxygenase and protocatechuate 3, 4-dioxygenase (66−84%). Ecological network showed that Comamonas testosterone -centered microbiome and Azotobacter linked to the nitrogen (N)-heterocyclic ring-cleavage. Network linkage further demonstrated that Alicycliphilus and Acidovorax were the key tone taxa involved in benzene ring-cleavage. Finally, combined with analysis of degradation products , bacteria degraded N-heterocyclic ring containing organic aromatic compounds (quinoline) mainly through anaerobic processes , whereas cleavage of benzene ring preferred aerobic pathways. The enriched functional species were the primary reason for the enhanced biodegradation in FEBS.

研究领域: 环境工程 · 微生物学 · 宏基因组学 · 废水处理

✓ 已验证 DOI PubMed 高影响因子

查看原文查看 PubMed

查找使用阿拉丁产品的科研文献

与阿拉丁产品相关的已发表科研成果

热门产品

Accelerated degradation of stainless-steel passive film by humic acid-mediated extracellular electron transfer

Metagenomic analysis of aromatic ring-cleavage mechanism in nano-Fe3O4@activated coke enhanced bio-system for coal pyrolysis wastewater treatment