| 王初丹,程星,沈宝甄,彭丽成,高刘,TARIQMehmood.PBAT微塑料海水环境中紫外老化特性及其对重金属的吸附影响[J].农业环境科学学报,2025,44(9):2374-2385. |
| PBAT微塑料海水环境中紫外老化特性及其对重金属的吸附影响 |
| Ultraviolet aging of PBAT microplastics in seawater and its effect on adsorption of heavy metals |
| 投稿时间：2024-09-26 |
| DOI：10.11654/jaes.2024-0808 |
| 中文关键词: 微塑料 PBAT 紫外老化 吸附 Cu(Ⅱ) Pb(Ⅱ) |
| 英文关键词: microplastics PBAT ultraviolet aging adsorption Cu(Ⅱ) Pb(Ⅱ) |
| 基金项目:海南省海洋地质资源与环境重点实验室开放课题（22-HNHYDZZYHJKF029）；海南省自然科学基金重点研发项目（ZDYF2022SHFZ278）；国家自然科学基金资助项目（42466006）；海南省博士后科学基金资助项目（2022-BH-03）；海南省南海育才项目（第三批南海创新人才）；海南省自然科学基金青年基金项目（优青项目，2024）（424YXQN415） |
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| 中文摘要: |
| 在紫外辐射强的热带海岛环境下，为探究可生物降解微塑料在海水中紫外辐射老化的特征及其对水中重金属的吸附影响，本研究通过室内模拟水热条件和紫外强光照射30 d和90 d的实验，对比聚己二酸-对苯二甲酸丁二醇酯（PBAT）微塑料老化的物理化学特征变化规律，探究其老化程度以及温度、pH等环境因素对PBAT吸附Cu（Ⅱ）和Pb（Ⅱ）的影响效应。结果表明：随着紫外老化时间的延长，PBAT微塑料结晶度和裂解程度增大；吸附时间增长、温度升高以及pH增大均可增强其对Cu（Ⅱ）和Pb（Ⅱ）的吸附能力，且对Pb（Ⅱ）的吸附能力大于对Cu（Ⅱ）的吸附能力，吸附时长达到300 min后吸附趋于平稳；吸附动力学拟合结果显示，原始和老化 30 d后的 PBAT微塑料较符合 Elovich模型，老化 90 d后的 PBAT则更符合 PSO模型；吸附等温线可通过 Freundlich模型很好地拟合。研究表明，PBAT微塑料对Cu（Ⅱ）和Pb（Ⅱ）的吸附与表面静电吸附、离子反应、酸碱效应等作用相关，属于多相多阶段过程。紫外老化作用增加了PBAT微塑料对Cu（Ⅱ）和Pb（Ⅱ）的饱和吸附量。 |
| 英文摘要: |
| 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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