Abstract：
The adsorption/desorption of Rhodamine B (RhB) on Polystyrene (PS), polypropylene (PP), and polyvinyl chloride (PVC) microplastics (MPs) was investigated in this study. The results showed that RhB adsorption on the selected MPs was fast. The adsorption coefficients (Kd) of RhB were 2036 ± 129, 1557 ± 91, and 63 ± 8.5 L kg- 1 for PS, PP, and PVC, respectively. RhB adsorption on PS and PP increased with increasing temperature and decreasing ionic strength, whereas RhB adsorption on PVC showed a completely opposite trend. The binding strength of RhB on the three types of MPs was weak as demonstrated by the high total desorption percentage, which ranged from 79.59 ~ 89.39%. This study shows that PP and PS MPs can accumulate RhB in the aquatic environment and their potential combined toxic risks should be taken seriously.
摘要：
聚苯乙烯(PS)吸附/解吸罗丹明B(RhB),聚丙烯（PP），和聚氯乙烯（PVC）微塑料（MPs）在这项研究中进行了研究。结果表明，RhB在所选MPs上的吸附速度较快。PS对RhB的吸附系数（Kd）分别为2036±129、1557±91和63±8.5Lkg-1，PP,PVC,分别。RhB在PS和PP上的吸附随着温度的升高和离子强度的降低而增加，而RhB在PVC上的吸附表现出完全相反的趋势。RhB在三种类型的MPs上的结合强度较弱，如高总解吸百分比所示。79.59~89.39%。这项研究表明，PP和PSMPs可以在水生环境中积累RhB，应认真对待其潜在的综合毒性风险。
