Abstract
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 (MoS2) nanosheets and beneficial soil bacteria. It was found that the log-reduction in the survival of Gram-positive Bacillus cereus was 2.8 (99.83%) and 4.9 (99.9988%) upon exposure to 16.0 mg/mL bulk MoS2 (macroscale) and 2D MoS2 nanosheets (nanoscale), respectively. For the case of Gram-negative Pseudomonas aeruginosa, the log-reduction values in bacterial survival were 1.9 (98.60%) and 5.4 (99.9996%) for the same concentration of bulk MoS2 and MoS2 nanosheets, respectively. Based on these findings, it is important to consider the potential toxicity of MoS2 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.
Highlights
Prior research has indicated that engineered nanomaterials, such as quantum dots, nanoparticles, nanowires, nanorods, and nanosheets, can be released to the environment contingently during their life cycles [1]
In many physicochemically interacting systems, the interplay among relevant characteristic length scales such as particle size, particle thickness, bacterial diameter, and bacterial size often controls the dynamics of interactions
We first investigated the morphological characteristics of soil bacteria
Summary
Prior research has indicated that engineered nanomaterials, such as quantum dots, nanoparticles, nanowires, nanorods, and nanosheets, can be released to the environment contingently during their life cycles (product use, disposal, and weathering) [1]. Dimkpa et al [5] investigated the effect of CuO (
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