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| Ultraviolet aging of PBAT microplastics in seawater and its effect on adsorption of heavy metals |
| Received:September 26, 2024 |
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| KeyWord:microplastics;PBAT;ultraviolet aging;adsorption;Cu(Ⅱ);Pb(Ⅱ) |
| Author Name | Affiliation | E-mail | | WANG Chudan | Hainan Key Laboratory of Marine Geological Resources and Environment, Haikou 570206, China
Hainan Geological Testing Research Center, Haikou 570206, China | | | CHENG Xing | School of Environmental Science and Engineering, Hainan University, Haikou 570228, China | | | SHEN Baozhen | Hainan Key Laboratory of Marine Geological Resources and Environment, Haikou 570206, China
Hainan Geological Testing Research Center, Haikou 570206, China | | | PENG Licheng | School of Environmental Science and Engineering, Hainan University, Haikou 570228, China | lcpeng@hainanu.edu.cn | | GAO Liu | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | gaoliu@ynau.edu.cn | | TARIQ Mehmood | School of Environmental Science and Engineering, Hainan University, Haikou 570228, China | |
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| Abstract: |
| In order to explore the ultraviolet radiation aging characteristics of biodegradable microplastics in seawater and its effect on adsorption of heavy metals under the tropical island environment with strong ultraviolet radiation, this study conducted indoor experiments under simulated hydrothermal conditions and ultraviolet glare for 30 days and 90 days, the physical and chemical characteristics of microplastics such as poly（butyleneadipate-co-terephthalate）（PBAT）were compared to explore the effects of aging degree, temperature, pH and other environmental changes on adsorption of Cu（Ⅱ）and Pb（Ⅱ）. The results showed that the crystallinity and cracking degree of microplastics PBAT increased with the extension of UV aging duration; The increase of adsorption time, temperature and pH could enhance the adsorption capacity of Cu（Ⅱ）and Pb（Ⅱ）, and the adsorption capacity of Pb（Ⅱ）were greater than that of Cu（Ⅱ）, and the adsorption tended to be stable after the adsorption time reaches 300 min. The adsorption kinetics fitting showed that the original and PBAT microplastics aged 30 days were more consistent with Elovich model, while the PBAT microplastics aged 90 days were more consistent with PSO model. The adsorption isotherm could be fitted well with the Freundlich model. Studies have shown that the adsorption of Cu（Ⅱ）and Pb（Ⅱ）by microplastics PBAT was related to surface electrostatic adsorption, ionic reaction, acid-base effect, etc, and belonged to a multi-phase and multi-stage process. UV aging increased the saturation adsorption capacity of Cu（Ⅱ）and Pb（Ⅱ）on microplastics PBAT. |
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