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This study investigated the aquatic toxicity effects and underlying mechanisms of thin-layer molybdenum disulfide (MoS2) using the Microcystis aeruginosa as a model organism. The results demonstrated that various concentration of MoS2 (0.01~50mg/L) significantly inhibited algal growth during short-term exposure (0~7 days), with the highest inhibition rate of 75% observed in the 50mg/L group after 6days of cultivation. Throughout the 7-day exposure phase, MoS2 exhibited strong dose-dependent inhibitory effects on pigment biosynthesis and biomass accumulation, as evidenced by concentration-responsive reduction in pigment content (<0.5mg/L), polysaccharides and proteins (<0.05mg/mL), and lipids synthesis (<2×105 fluorescence units). When exposure duration extended to 14~21 days, the observed inhibitory effects gradually alleviated, though high-concentration treatments (50 and 10mg/L) still maintained substantial growth inhibition. Mechanistic analysis revealed that photoactivated MoS2 nanoparticles generated reactive oxygen species (ROS), triggering acute/chronic oxidative stress in algal cells. During the initial 0~7 day exposure, intracellular ROS levels, superoxide dismutase (SOD) activity, and extracellular polymeric substances (EPS) secretion all significantly increased. These oxidative stress indicators progressively normalized during prolonged exposure (14~21 days). However, under high-concentration exposure conditions (50 and 10mg/L), the oxidative stress response exceeded cellular defense capacity, ultimately causing irreversible membrane damage. These findings provide fundamental data and theoretical support for ecological risk assessment of MoS2 nanomaterials in aquatic environments.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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