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| The adsorption behavior of phosphorus in microplastics in water and soil |
| Received:March 10, 2021 |
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| KeyWord:microplastics;soil;phosphorus;adsorption |
| Author Name | Affiliation | E-mail | | LI Wang | National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China | | | ZU Bo | National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China | zubo@cqjtu.edu.cn | | RAN Dianrong | National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China | | | HUANG Yinquan | National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China | | | LI Jiawen | Chongqing Academy of Ecological and Environmental Science, Chongqing 401120, China | |
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| Abstract: |
| In order to explore the adsorption characteristics of phosphorus(P) in microplastics in water and soil, and the influence of different factors on the adsorption of P in microplastics and soil, two types of common microplastics[polypropylene(PP) and polystyrene (PS)] were used to conduct adsorption experiments. The results showed that the loose and porous PP possessed a stronger adsorption performance and larger adsorption capacity than PS. The Zeta potential of both microplastics decreased with increasing pH, and the point of zero charge of PS and PP was reached at a pH of 5.92 and 6.45, respectively. The adsorption of P on PP and PS was mainly single-layer saturated adsorption, the adsorption method was mainly by physical adsorption, and the adsorption process was a spontaneous reaction of exothermic and entropy reduction. The unit adsorption of P by microplastics showed a "U-shaped" trend that decreased first and then increased with the increase in pH, while increasing temperature was not conducive to the adsorption of P on PP and PS. With the increase of the mass addition ratio of microplastics in soil, the increase of phosphorus adsorption in soil-microplastics system was limited. In conclusion, the experiments showed that different types of microplastics had different adsorption capacities, and environmental factors considerably affected their adsorption of phosphorus. The continuous accumulation of microplastics had a limited promotion effect on P adsorption in soil, and the promotion effect did not vary greatly with the different types of microplastics. The results lay a foundation for further research on the adsorption behavior of microplastics in soil. |
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