Full
Outline
Taking three types of the most frequently detected microplastics (MPs) in the environment, i.e., polyethylene (PE), polyvinyl chloride (PVC), and polystyrene (PS), as the research objects, their ultraviolet (UV) aging and the environmental behavior of aged MPs to diclofenac (DCF) were explored in this study. The results indicate that after UV aging, the surface roughness, specific surface area and average pore size of the three MPs increased, while their contact angle and point of zero charge decreased. Moreover, UV aging caused an increase in the oxygen content of MPs, with a significant increase in the content of oxygen-containing functional groups such as carbonyl and hydroxyl. Adsorption experimental results show that different MPs had slightly different adsorption capacities for DCF, and PS exhibited stronger DCF adsorption ability with the adsorption capacity of 0.5626mg/g. The adsorption capacities of UV-aged PE, PVC and PS for DCF were 0.4884, 0.6077and 0.6382mg/g, respectively, which were stronger than that of the original MPs. The adsorption amount of DCF by MPs before and after aging both decreased with increasing pH or the increase in salinity and humic acid concentration. The adsorption process for DCF by MPs was divided into three stages, i.e., liquid film diffusion, particle internal diffusion, and adsorption equilibrium, and the adsorption mechanism mainly involved physical adsorption dominated by hydrophobic interactions, van der Waals forces, hydrogen bonding and electrostatic interactions.
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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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