陈浩然, 李昊, 林雨男, 高峭, 阎波. 生物老化微塑料对重金属铜的吸附特性研究[J]. 海洋环境科学. DOI: 10.12111/j.mes.2024-x-0005
引用本文: 陈浩然, 李昊, 林雨男, 高峭, 阎波. 生物老化微塑料对重金属铜的吸附特性研究[J]. 海洋环境科学. DOI: 10.12111/j.mes.2024-x-0005
CHEN Haoran, LI Hao, LIN Yunan, GAO Qiao, YAN Bo. Adsorption properties of heavy metal copper on bio-aging microplastics[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE. DOI: 10.12111/j.mes.2024-x-0005
Citation: CHEN Haoran, LI Hao, LIN Yunan, GAO Qiao, YAN Bo. Adsorption properties of heavy metal copper on bio-aging microplastics[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE. DOI: 10.12111/j.mes.2024-x-0005

生物老化微塑料对重金属铜的吸附特性研究

Adsorption properties of heavy metal copper on bio-aging microplastics

  • 摘要: 微塑料在水生环境中会被细菌、浮游植物等微生物定殖,在表面形成一层生物膜,进而改变了微塑料的特性及其环境行为。本文探究了永定新河河口区域的聚苯乙烯(polystyrene,PS)微塑料在不同盐度下的生物老化行为及其对于铜离子吸附特性的影响,并对其老化过程、吸附动力学和等温吸附进行了讨论。结果表明,生物膜改变了微塑料在水中的存在状态;PS原始微塑料对Cu(Ⅱ)的吸附过程更加符合准二级动力学模型和Langmuir等温模型,R2分别为0.9978和0.9888。生物老化微塑料更加符合颗粒内扩散模型和Freundlich等温模型,R2分别0.9404和0.9918。生物老化导致吸附过程由主要发生在微塑料表面的单层吸附转变为在不均质表面发生的多层吸附和颗粒内扩散过程;生物老化微塑料在蒸馏水和人工海水介质中对Cu(Ⅱ)的最大吸附量分别提高了0.287 mg/g和0.158 mg/g,表明生物膜可以提供更多的吸附点位并增强吸附能力,在低盐度水体下培养的生物膜对于吸附的影响要强于高盐度水体。本文的研究结果为探究微塑料在环境中的赋存状态和环境行为提供了新的科学依据,对微塑料的生态风险评估具有一定意义。

     

    Abstract: Microplastics in aquatic environments are colonised by microorganisms, such as bacteria and phytoplankton, forming a biofilm on their surface. This biofilm alters the properties of the microplastics, affecting their environmental behaviour. This paper investigates the bio-aging behaviour of polystyrene (PS) microplastics in the estuary area of Yongdingxin river under different salinities and their effects on the adsorption characteristics of copper ions. The aging process, adsorption kinetics and isothermal adsorption are discussed. The study found that the biofilm alters the state of microplastics in water. The adsorption process of Cu(Ⅱ) on pristine PS microplastics followed the quasi-secondary kinetic model and Langmuir isothermal model, with R2 values of 0.9978 and 0.9888, respectively. While the adsorption of Cu (Ⅱ) on bio-aged microplastics followed the intra-particle diffusion model and Freundlich isothermal model, with R2 values of 0.9404 and 0.9918, respectively. Bio-aging transformed the adsorption process of Cu (Ⅱ) on microplastics from monolayer adsorption, which mainly occurs on the surface of the microplastics, to multilayer adsorption and intra-particle diffusion, which occur on inhomogeneous surfaces. The bio-aged microplastics exhibited an increase in maximum Cu (Ⅱ) adsorption of 0.287 mg/g and 0.158 mg/g in distilled water and artificial seawater, respectively. This suggests that biofilms provide more adsorption sites and enhance the adsorption capacity. Additionally, biofilms cultivated in low salinity water have a stronger effect on adsorption than those in high salinity water. This paper provides a new scientific basis for investigating microplastics in the environment and their behaviour, which is significant for the ecological risk assessment of microplastics..

     

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