Adsorption and desorption of Hg(II) by four aged microplastics and its effects on gaseous elemental mercury production in seawater
Microplastics (MPs) weather after entering the environment gradually, and the interaction with metal ions in the aqueous environment has received extensive attention. However, there are few studies on Hg(Ⅱ), especially the effect of MPs on the release of Hg0(DEM) in water after entering the aqueous...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-03-01
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| Series: | Ecotoxicology and Environmental Safety |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651324001118 |
| _version_ | 1797300399994044416 |
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| author | Xuyuan Zhou Yan Wang Ruhai Liu Bing Mo Dongting Li Likun He Yudong Wang Yunxu Wang Hao Zheng Fengmin Li |
| author_facet | Xuyuan Zhou Yan Wang Ruhai Liu Bing Mo Dongting Li Likun He Yudong Wang Yunxu Wang Hao Zheng Fengmin Li |
| author_sort | Xuyuan Zhou |
| collection | DOAJ |
| description | Microplastics (MPs) weather after entering the environment gradually, and the interaction with metal ions in the aqueous environment has received extensive attention. However, there are few studies on Hg(Ⅱ), especially the effect of MPs on the release of Hg0(DEM) in water after entering the aqueous environment. In this study, four types of MPs (PP, PE, PET, PVC) were selected to study the adsorption and desorption behavior of Hg(Ⅱ) after photoaging and to explore the influence of MPs on the release of DEM in seawater under different lighting conditions. The results showed that the specific surface area, negative charges, and oxygen-containing functional group of MPs increased after aging. The adsorption capacity of aged MPs for Hg(Ⅱ) was significantly improved, which was consistent with the pseudo-first-order and pseudo-second-order model, indicating that the adsorption process was a chemical and physical adsorption. The fitting results of the in-particle diffusion model indicated that the adsorption was controlled by multiple steps. Hg(Ⅱ) was easier to desorb in the simulated gastric fluid environment. Because the aged MPs had the stronger binding force to Hg(Ⅱ), their desorption rate is lower than new MPs. Under visible light and UVA irradiation, MPs inhibited the release of Hg0. Under UVA, the mass of DEM produced in seawater with aged PE and PVC was higher than that of new PE and PVC. The aged PE and PVC could produce more ·O2-, which was conducive to the reduction of mercury. However, in UVB irradiation, the addition of MPs promoted the release of DEM, and ·O2- also played an important contribution in affecting the photochemical reaction of mercury. Therefore, the presence of aged MPs will significantly affect the water-air exchange of Hg in water. Compared with new MPs, aged MPs improved the contribution of free radicals in Hg transformation by releasing reactive oxygen species. This study extends the understanding of the effects of MPs on the geochemical cycle of Hg(Ⅱ) in seawater, better assesses the potential combined ecological risks of MPs and Hg(Ⅱ), and provides certain guidance for the pollution prevention and control of MPs. |
| first_indexed | 2024-03-07T23:06:39Z |
| format | Article |
| id | doaj.art-01a5d1fe34d742fab95beaa973975457 |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-03-07T23:06:39Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-01a5d1fe34d742fab95beaa9739754572024-02-22T04:51:26ZengElsevierEcotoxicology and Environmental Safety0147-65132024-03-01272116036Adsorption and desorption of Hg(II) by four aged microplastics and its effects on gaseous elemental mercury production in seawaterXuyuan Zhou0Yan Wang1Ruhai Liu2Bing Mo3Dongting Li4Likun He5Yudong Wang6Yunxu Wang7Hao Zheng8Fengmin Li9Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, ChinaKey Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, ChinaKey Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; Corresponding author at: Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, ChinaKey Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, ChinaKey Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, ChinaKey Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, ChinaKey Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, ChinaKey Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, ChinaKey Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, ChinaMicroplastics (MPs) weather after entering the environment gradually, and the interaction with metal ions in the aqueous environment has received extensive attention. However, there are few studies on Hg(Ⅱ), especially the effect of MPs on the release of Hg0(DEM) in water after entering the aqueous environment. In this study, four types of MPs (PP, PE, PET, PVC) were selected to study the adsorption and desorption behavior of Hg(Ⅱ) after photoaging and to explore the influence of MPs on the release of DEM in seawater under different lighting conditions. The results showed that the specific surface area, negative charges, and oxygen-containing functional group of MPs increased after aging. The adsorption capacity of aged MPs for Hg(Ⅱ) was significantly improved, which was consistent with the pseudo-first-order and pseudo-second-order model, indicating that the adsorption process was a chemical and physical adsorption. The fitting results of the in-particle diffusion model indicated that the adsorption was controlled by multiple steps. Hg(Ⅱ) was easier to desorb in the simulated gastric fluid environment. Because the aged MPs had the stronger binding force to Hg(Ⅱ), their desorption rate is lower than new MPs. Under visible light and UVA irradiation, MPs inhibited the release of Hg0. Under UVA, the mass of DEM produced in seawater with aged PE and PVC was higher than that of new PE and PVC. The aged PE and PVC could produce more ·O2-, which was conducive to the reduction of mercury. However, in UVB irradiation, the addition of MPs promoted the release of DEM, and ·O2- also played an important contribution in affecting the photochemical reaction of mercury. Therefore, the presence of aged MPs will significantly affect the water-air exchange of Hg in water. Compared with new MPs, aged MPs improved the contribution of free radicals in Hg transformation by releasing reactive oxygen species. This study extends the understanding of the effects of MPs on the geochemical cycle of Hg(Ⅱ) in seawater, better assesses the potential combined ecological risks of MPs and Hg(Ⅱ), and provides certain guidance for the pollution prevention and control of MPs.http://www.sciencedirect.com/science/article/pii/S0147651324001118MicroplasticsAdsorptionMercuryReleasePhotoreduction |
| spellingShingle | Xuyuan Zhou Yan Wang Ruhai Liu Bing Mo Dongting Li Likun He Yudong Wang Yunxu Wang Hao Zheng Fengmin Li Adsorption and desorption of Hg(II) by four aged microplastics and its effects on gaseous elemental mercury production in seawater Ecotoxicology and Environmental Safety Microplastics Adsorption Mercury Release Photoreduction |
| title | Adsorption and desorption of Hg(II) by four aged microplastics and its effects on gaseous elemental mercury production in seawater |
| title_full | Adsorption and desorption of Hg(II) by four aged microplastics and its effects on gaseous elemental mercury production in seawater |
| title_fullStr | Adsorption and desorption of Hg(II) by four aged microplastics and its effects on gaseous elemental mercury production in seawater |
| title_full_unstemmed | Adsorption and desorption of Hg(II) by four aged microplastics and its effects on gaseous elemental mercury production in seawater |
| title_short | Adsorption and desorption of Hg(II) by four aged microplastics and its effects on gaseous elemental mercury production in seawater |
| title_sort | adsorption and desorption of hg ii by four aged microplastics and its effects on gaseous elemental mercury production in seawater |
| topic | Microplastics Adsorption Mercury Release Photoreduction |
| url | http://www.sciencedirect.com/science/article/pii/S0147651324001118 |
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