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| Effect of polyamide microplastics on the adsorption of sulfonic acid perfluoroalkyl compounds at the water-soil interface |
| DU Yu-zan, SUN Jiao-xia, FU Jiang, XIANG Hong, LUO Xue, YANG Fan, WANG Xi, FAN Jian-xin |
| School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China |
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Abstract In this study, the adsorption and distribution processes of 6:2 fluorotelomer sulfonic acid (6:2 FTSA) and perfluorohexane sulfonate (PFHxS) in polyamide (PA) microplastics and soil interaction systems were investigated,and the effects of various factors on their adsorption were explored. The results indicated that the adsorption equilibrium time for 6:2 FTSA and PFHxS in the microplastic-soil interaction system (approximately 120 hours) was significantly slower than in individual microplastic and soil systems (approximately 24 hours). Furthermore, the adsorption equilibrium capacity of 6:2 FTSA (0.044mg/g) and PFHxS (0.173mg/g) in the microplastic-soil interaction system was considerably lower than in PA microplastics alone (6:2FTSA:2.698mg/g; PFHxS: 3.518mg/g), but slightly higher than in soil alone (6:2FTSA:0.026mg/g;PFHxS: 0.048mg/g). With the increase of the content of microplastics in soil, the proportion of 6:2FTSA and PFHxS on microplastics gradually increased, especially for PFHxS. From the perspective of microplastics, the interaction with soil altered the surface properties of microplastics. As soil minerals occupied some adsorption sites of microplastics, the adsorption capacity of microplastics for 6:2FTSA and PFHxS was significantly reduced. Conversely, from the soil perspective, the presence of microplastics enhanced the soil's adsorption capacity for 6:2FTSA and PFHxS, with this effect becoming more pronounced as the proportion of microplastics increased, due to the strong adsorption affinity of microplastics for PFAS. In the co-cultivation system of microplastics and soil, although the surface properties of microplastics were modified over time, the overall adsorption of 6:2FTSA and PFHxS by the PA microplastics-soil system was not been significantly altered. These findings suggest that microplastics exert a long-lasting and relatively stable influence on PFAS in soil.
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Received: 02 August 2024
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Corresponding Authors:
孙姣霞,副教授,990201300012@cqjtu.edu.cn
E-mail: 990201300012@cqjtu.edu.cn
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