As　a　kind　of　emerging　pollutant,　microplastics　(MPs)　play　an　important　role　as　a　carrier　for　pollutant　migration　in　the　water　environment.　Carried　by　the　MPs,　benzotriazoles,　and　benzothiazoles　(collectively　referred　to　as　BTs)1　are　ubiquitous　water　contaminants.　In　this　paper,　the　adsorption　behavior　of　BTs　on　polyvinyl　chloride　(PVC)　MPs　was　first　studied　systematically　to　explain　the　adsorptive　mechanisms　and　the　consequential　pollution　caused　by　the　absorption-desorption　process.　The　studies　on　kinetics,　isotherms,　and　thermodynamics　revealed　that　the　adsorption　of　BTs　on　PVC　MPs　was　a　multi-rate,　heterogeneous　multi-layer,　and　exothermic　process,　which　was　affected　by　external　diffusion,　intra-particle　diffusion,　and　dynamic　equilibrium.　The　factors　including　pH,　salinity,　and　particle　size　also　influenced　the　adsorption　process.　In　the　multi-solute　system,　competitive　adsorption　would　occur　between　different　BTs.　The　desorption　of　BTs　from　PVC　MPs　was　positively　associated　with　the　increase　of　adsorption　amount.　Based　on　the　results,　the　adsorption　mechanisms　of　PVC　MPs　were　clarified,　involving　hydrophobic　interaction,　electrostatic　force,　and　non-covalent　bonds.　It　was　demonstrated　that　BTs　in　the　water　environment　could　most　probably　be　accumulated　and　migrated　through　MPs,　and　eventually　carried　into　organisms,　posing　an　increased　risk　to　the　ecological　environment.　©　2022