The environmental safety assessment of nanomaterials has long been investigated by many scientists and a number of studies have been conducted to investigate the effects of nanomaterials on environmental microorganisms. For instance, Lyon et al. have shown that C60 in powder form had no impact on bacteria while an aqueous suspension of C60 generated toxic effects . Li et al. have also demonstrated that carbon nanotubes showed antimicrobial activity on the studied bacterial strains . Some researchers found that graphene could damage the cell membrane of Escherichia coli (E. coli) and thereby, showed strong antibacterial activity .