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| Effect of aging on co-transport of microplastics and cadmium in canal soils |
| YANG Rong1, ZHAO Fan2, GUI Xiang-yang3, CAO Feng-he1, LI Bo-wen1, CHEN Ming1 |
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
2. School of Education, Soochow University, Suzhou 215123, China;
3. School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China |
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Abstract Packed column experiments and numerical simulations were conducted to investigate the effect of microplastics (MPs) aging on their co-transport with cadmium Cd(II) in canal soils. The aging of MPs facilitated their transport in soils. Compared with pristine (unaged) MPs, the transportability of aged MPs in soils increased by 28.3%~184%. This is likely because of the enhanced negative charges of MPs after aging, resulting in enhanced stability of MP suspensions and stronger repulsive energy barrier between aged MPs and soil particles. For the co-transport of MPs and Cd(II), compared with MPs-alone, the presence of Cd(II) inhibited the transport of MPs in soils, decreasing by 0.20~0.33 times. The aging effect of MPs further reinforced the inhibited transport of MPs by Cd(II), decreasing by 0.21~0.59times. In contract, MPs acted as carriers that enhance the transport of adsorbed Cd(II) in soils. Furthermore, the aged MPs exhibited greater enhancement effect on Cd(II) transport, increasing by 0.56~3.2 times, mainly due to the increased transport of aged MPs that can carry more adsorbed Cd(II). A two-site kinetic retention model was successfully employed to simulate the co-transport of MPs and Cd(II) in soils. The modeling results illustrate the effect of the aging on co-transport of MPs and Cd(II) and further indicate that the aged MPs increased the transport solute flux and potential risks of Cd(II) in soils.
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Received: 21 March 2024
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