Toxicity and environmental impact of multi-walled carbon nanotubes to nitrogen-fixing bacterium Azotobacter chroococcum

被引：11

作者：

Ouyang, Bowei ^{[1
]}

Yilihamu, Ailimire ^{[1
]}

Liu, Dong ^{[1
]}

Ouyang, Peng ^{[1
]}

Zhang, Dongyan ^{[1
]}

Wu, Xian ^{[1
]}

Yang, Sheng-Tao ^{[1
]}

机构：

[1] Southwest Minzu Univ, Sch Chem & Environm, Key Lab Pollut Control Chem & Environm Funct Mat, Natl Ethn Affairs Commiss, Chengdu 610041, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2021年 / 9卷 / 04期

关键词：

Carbon nanotubes; Nitrogen fixation; Azotobacter chroococcum; Toxicity; Environmental safety; FIXATION; NANOMATERIALS; STRESS; OXIDE; SUSCEPTIBILITY; NANOPARTICLES; REDUCTION; GROWTH; ROOTS;

D O I：

10.1016/j.jece.2021.105291

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

With the large-scale production and wide applications of carbon nanotubes (CNTs), they are inevitably entering the environment and bringing unknown threats to environmental organisms. Nitrogen-fixing bacteria dominate 80% of the nitrogen fixation in nitrogen cycle. Herein, we investigated the toxicity and environmental impact of multi-walled CNTs (MWCNTs) to nitrogen-fixing bacterium Azotobacter chroococcum. MWCNTs slightly inhibited the growth of A. chroococcum and induced small increase of death rate at high concentrations. MWCNTs did not penetrate the cell walls of A. chroococcum and no cytoplasm loss was observed. MWCNTs were only observed surrounding the A. chroococcum cells. According to oxidative stress assays, MWCNTs induced meaningful oxidative damage at 0.5 mg/mL after 6 d exposure, but the oxidative damage diminished at 14 d. MWCNTs did not affect the nitrogen fixation activity of A. chroococcum and the soil nitrogen contents. Our findings provided the fundamental data for the environmental safety of CNTs to nitrogen-fixing bacteria.

引用

页数：9

共 51 条

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