Role of surface secondary mineral on tylosin degradation mediated by the pyrite oxidation process
This study investigated the photodegradation performance and mechanisms of pyrite,with varying degrees of oxidation,on the macrolide antibiotic tylosin(TYL),which is extensively used in animal husbandry.The results indicated that oxidized pyrite significantly enhanced its photocatalytic degradation efficiency towards TYL.The surface roughness of the oxidized pyrite samples increased,leading to a larger specific surface area and a greater number of active sites for surface reactions,which improved the adsorption capacity for TYL.Moreover,the surface electron transfer process of oxidized pyrite was significantly enhanced,which accelerated the production rate of hydroxyl radicals(·OH)and improved the photodegradation efficiency of TYL.Additionally,the interaction between pyrite(FeS2)and the newly formed Fe2O3 on the surface created a heterojunction that effectively inhibited the recombination of photogenerated electrons and holes within the material,thereby augmenting the photodegradation performance.
pyrite(FeS2)oxidative corrosionphotodegradation effectstylosin(TYL)secondary mineral
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