摘要
      微塑料、抗生素和微生物在水生环境中普遍共存。MPs在水生环境中不可避免地经历光老化过程，影响MPs与抗生素之间的相互作用以及微生物的抗生素耐药性。在本研究中，研究了MPs的光老化过程对其四环素（TC）吸附行为的影响以及抗生素耐药性的相关形成。研究发现，光老化过程显著增加了TC在MPs上的吸附能力，在288K时Qe从0.387增加到0.507mg/g，在308K时从0.507增加到0.688mg/g。位点能量分布（SED）分析进一步证实，吸附能力的增强归因于从MPs光老化过程中获得的更多高能吸附位点。此外，当吸附有TC的MP被生物膜覆盖时，TC的增强吸附进一步促进了七个抗生素抗性基因（即tetA、tetB、tetC、tetD、tetetE、tetG、tetK）的形成。这项研究有助于全面了解共存MP、抗生素和微生物的环境行为，为评估和减轻它们的共存风险提供理论依据。
Abstract
Microplastics (MPs), antibiotics and microorganism ubiquitously coexist in aquatic environments. MPs inevitably undergo photoaging processes in aquatic environments, affecting the interactions between MPs and antibiotics and the antibiotic resistance of microorganism. In this study, the impact of photoaging processes of MPs on their adsorption behavior of tetracycline (TC) and related formation of antibiotic resistance were investigated. It was found that the photoaging processes significantly increased the adsorption capacity of TC onto MPs, with the Qe increasing from 0.387 to 0.507 mg/g at 288 K and from 0.507 to 0.688 mg/g at 308 K. The site energy distribution (SED) analysis further confirmed that the enhanced adsorption capacity was attributed to more high-energy adsorption sites acquired from MPs photoaging processes. Moreover, the enhanced adsorption of TC further facilitated the formation of seven antibiotic resistance genes (i.e., tetA, tetB, tetC, tetD, tetE, tetG, tetK) when MPs adsorbed with TC was covered by biofilm. This study helps comprehensively understand the environmental behaviors of co-existing MPs, antibiotics and microorganisms, providing a theoretical basis for evaluating and mitigating their coexistence risks.

https://www.sciencedirect.com/science/article/abs/pii/S0045653523000863