Bae Michael, Oh Jun Kyun, Liu Shuhao, Nagabandi Nirup, Yegin Yagmur, DeFlorio William, Cisneros-Zevallos Luis, Scholar Ethan M A
Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.
Department of Polymer Science and Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin-si 16890, Gyeonggi-do, Korea.
Nanomaterials (Basel). 2021 May 31;11(6):1453. doi: 10.3390/nano11061453.
Concerns arising from accidental and occasional releases of novel industrial nanomaterials to the environment and waterbodies are rapidly increasing as the production and utilization levels of nanomaterials increase every day. In particular, two-dimensional nanosheets are one of the most significant emerging classes of nanomaterials used or considered for use in numerous applications and devices. This study deals with the interactions between 2D molybdenum disulfide (MoS) nanosheets and beneficial soil bacteria. It was found that the log-reduction in the survival of Gram-positive was 2.8 (99.83%) and 4.9 (99.9988%) upon exposure to 16.0 mg/mL bulk MoS (macroscale) and 2D MoS nanosheets (nanoscale), respectively. For the case of Gram-negative , the log-reduction values in bacterial survival were 1.9 (98.60%) and 5.4 (99.9996%) for the same concentration of bulk MoS and MoS nanosheets, respectively. Based on these findings, it is important to consider the potential toxicity of MoS nanosheets on beneficial soil bacteria responsible for nitrate reduction and nitrogen fixation, soil formation, decomposition of dead and decayed natural materials, and transformation of toxic compounds into nontoxic compounds to adequately assess the environmental impact of 2D nanosheets and nanomaterials.
随着纳米材料的生产和利用水平每日不断提高，新型工业纳米材料意外和偶尔释放到环境及水体中所引发的担忧正在迅速增加。特别是，二维纳米片是在众多应用和设备中已被使用或考虑使用的最重要的新兴纳米材料类别之一。本研究探讨了二维二硫化钼（MoS）纳米片与有益土壤细菌之间的相互作用。研究发现，在暴露于16.0 mg/mL的块状MoS（宏观尺度）和二维MoS纳米片（纳米尺度）时，革兰氏阳性菌存活率的对数减少分别为2.8（99.83%）和4.9（99.9988%）。对于革兰氏阴性菌，在相同浓度的块状MoS和MoS纳米片作用下，细菌存活率的对数减少值分别为1.9（98.60%）和5.4（99.9996%）。基于这些发现，考虑MoS纳米片对负责硝酸盐还原和固氮、土壤形成、死亡和腐烂天然物质分解以及将有毒化合物转化为无毒化合物的有益土壤细菌的潜在毒性，对于充分评估二维纳米片和纳米材料的环境影响至关重要。
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