Adsorption of Diclofenac Sodium by Aged Degradable and Non-Degradable Microplastics: Environmental Effects, Adsorption Mechanisms
Microplastics (MPs) are novel pollutants, which can carry toxic contaminants and are released in biota and accumulate. The adsorption behavior of MPs and aged MPs has attracted extensive attention. In this paper, the aging process of polystyrene (PS) and poly (butyleneadipate-co-terephthalate) (PBAT...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-12-01
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| Series: | Toxics |
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| Online Access: | https://www.mdpi.com/2305-6304/11/1/24 |
| _version_ | 1797436744211103744 |
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| author | Siqi Liang Kangkang Wang Kefu Wang Yuli Kou Tao Wang Changyan Guo Wei Wang Jide Wang |
| author_facet | Siqi Liang Kangkang Wang Kefu Wang Yuli Kou Tao Wang Changyan Guo Wei Wang Jide Wang |
| author_sort | Siqi Liang |
| collection | DOAJ |
| description | Microplastics (MPs) are novel pollutants, which can carry toxic contaminants and are released in biota and accumulate. The adsorption behavior of MPs and aged MPs has attracted extensive attention. In this paper, the aging process of polystyrene (PS) and poly (butyleneadipate-co-terephthalate) (PBAT) plastics under ultraviolet (UV) irradiation at a high temperature and their adsorption properties for the contaminant diclofenac sodium (DCF) before and after aging was investigated. There are many factors affecting the adsorption capacity of MPs. In this experiment, three aspects of MPs, organic pollutants, and environmental factors are explored. The Freundlich model as well as the pseudosecondary kinetic model is more applicable to the process of DCF adsorption by MPs. The main effects of adsorption of organic pollutants by MPs are electrostatic interactions, hydrogen-halogen bonds, and hydrophobic interactions. The adsorption capacity of the UV-aged MPs on DCF is significantly enhanced, and the order of adsorption capacity is Q<sub>(A-PBAT)</sub> (27.65 mg/g) > Q <sub>(A-PS)</sub> (23.91 mg/g) > Q <sub>(PBAT)</sub> (9.30 mg/g) > Q <sub>(PS)</sub> (9.21 mg/g). The results show that more active sites are generated on the surface of MPs after aging, which can enhance their adsorption capacity for organic pollutants. This adsorption mechanism will increase their role as contaminant carriers in the aquatic food chain. |
| first_indexed | 2024-03-09T11:06:59Z |
| format | Article |
| id | doaj.art-4a7f1465b5e8410e97cd02e8ddcd3c40 |
| institution | Directory Open Access Journal |
| issn | 2305-6304 |
| language | English |
| last_indexed | 2024-03-09T11:06:59Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Toxics |
| spelling | doaj.art-4a7f1465b5e8410e97cd02e8ddcd3c402023-12-01T00:55:18ZengMDPI AGToxics2305-63042022-12-011112410.3390/toxics11010024Adsorption of Diclofenac Sodium by Aged Degradable and Non-Degradable Microplastics: Environmental Effects, Adsorption MechanismsSiqi Liang0Kangkang Wang1Kefu Wang2Yuli Kou3Tao Wang4Changyan Guo5Wei Wang6Jide Wang7Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830000, ChinaKey Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830000, ChinaKey Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830000, ChinaKey Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830000, ChinaKey Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830000, ChinaKey Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830000, ChinaDepartment of Chemistry and Centre for Pharmacy, University of Bergen, 5007 Bergen, NorwayKey Laboratory of Oil and Gas Fine Chemicals, Ministry of Education & Xinjiang Uygur Autonomous Region, School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830000, ChinaMicroplastics (MPs) are novel pollutants, which can carry toxic contaminants and are released in biota and accumulate. The adsorption behavior of MPs and aged MPs has attracted extensive attention. In this paper, the aging process of polystyrene (PS) and poly (butyleneadipate-co-terephthalate) (PBAT) plastics under ultraviolet (UV) irradiation at a high temperature and their adsorption properties for the contaminant diclofenac sodium (DCF) before and after aging was investigated. There are many factors affecting the adsorption capacity of MPs. In this experiment, three aspects of MPs, organic pollutants, and environmental factors are explored. The Freundlich model as well as the pseudosecondary kinetic model is more applicable to the process of DCF adsorption by MPs. The main effects of adsorption of organic pollutants by MPs are electrostatic interactions, hydrogen-halogen bonds, and hydrophobic interactions. The adsorption capacity of the UV-aged MPs on DCF is significantly enhanced, and the order of adsorption capacity is Q<sub>(A-PBAT)</sub> (27.65 mg/g) > Q <sub>(A-PS)</sub> (23.91 mg/g) > Q <sub>(PBAT)</sub> (9.30 mg/g) > Q <sub>(PS)</sub> (9.21 mg/g). The results show that more active sites are generated on the surface of MPs after aging, which can enhance their adsorption capacity for organic pollutants. This adsorption mechanism will increase their role as contaminant carriers in the aquatic food chain.https://www.mdpi.com/2305-6304/11/1/24ultraviolet radiationdiclofenac sodiumaged microplasticsadsorption mechanisms |
| spellingShingle | Siqi Liang Kangkang Wang Kefu Wang Yuli Kou Tao Wang Changyan Guo Wei Wang Jide Wang Adsorption of Diclofenac Sodium by Aged Degradable and Non-Degradable Microplastics: Environmental Effects, Adsorption Mechanisms Toxics ultraviolet radiation diclofenac sodium aged microplastics adsorption mechanisms |
| title | Adsorption of Diclofenac Sodium by Aged Degradable and Non-Degradable Microplastics: Environmental Effects, Adsorption Mechanisms |
| title_full | Adsorption of Diclofenac Sodium by Aged Degradable and Non-Degradable Microplastics: Environmental Effects, Adsorption Mechanisms |
| title_fullStr | Adsorption of Diclofenac Sodium by Aged Degradable and Non-Degradable Microplastics: Environmental Effects, Adsorption Mechanisms |
| title_full_unstemmed | Adsorption of Diclofenac Sodium by Aged Degradable and Non-Degradable Microplastics: Environmental Effects, Adsorption Mechanisms |
| title_short | Adsorption of Diclofenac Sodium by Aged Degradable and Non-Degradable Microplastics: Environmental Effects, Adsorption Mechanisms |
| title_sort | adsorption of diclofenac sodium by aged degradable and non degradable microplastics environmental effects adsorption mechanisms |
| topic | ultraviolet radiation diclofenac sodium aged microplastics adsorption mechanisms |
| url | https://www.mdpi.com/2305-6304/11/1/24 |
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