Study On S/Ag-doped SrTiO₃ Visible Light Catalytic Degradation Of Nonylphenol

Nonylphenol is a very toxic organic pollutant with persistence and bioaccumulation.NP exposure has potential estrogenic effects on organisms,so it is also considered as a type of endocrine disruptors,which enter organisms through various ways such as ingestion and accumulation,and cause serious effects on the biological endocrine system,especially the reproductive system.In this paper,NP is selected as the target pollutant,and sulfur-doped Sr Ti O₃（S-STO）,Ag metalized Sr Ti O₃（Ag-STO）and Ag metalized sulfur-doped Sr Ti O₃（Ag-S-STO）composite system catalyst,the experiment explored the degradation of NP by the three prepared catalysts,and compared the results with the previous catalysts.（1）Photocatalysis of single STO catalyst on NP（1）When the catalyst dosage and the light time are the same,the degradation rate of STO for the four initial concentrations of NP solution is:15mg/LNP>20mg/LNP>25mg/L NP>10mg/LNP.The degradation effect of 15mg/L NP is the best,and the degradation rate is 80.14%.（2）When the dosage of STO is 0.10g and the light time is 5h,the maximum degradation rate of NP is 76.21%.（3）The degradation effect of NP under the condition of synergistic light with the catalyst is obviously better than that of shading,The degradation rate is increased by about 50%.（2）Study on the photocatalytic degradation of NP by three composite catalysts of S-STO,Ag-STO and Ag-S-STO（1）The degradation degree of NP by the three composite catalysts of S-STO,Ag-STO and Ag-S-STO is closely related to its initial concentration.The initial concentration of NP with the best removal rate is 15mg/L.（3）Visible light illumination time has a greater impact on the catalytic degradation efficiency of NP.The longer the illumination time,the higher the catalytic degradation efficiency of NP.（4）S-STO,Ag-STO,Ag-S-STO three composite catalysts after five repeated experiments,the degradation loss is 3.93%,6.2%,5.74%,the degradation rate can still reach more than 50%,Therefore,the S-STO,Ag-STO,and Ag-S-STO catalysts prepared in this experiment have high reusability and are of great significance to real life.（5）Regardless of doping with S or Ag or co-doping,the photocatalytic performance of the catalyst is significantly improved.The degradation rate increased from 46.53%to 55.92%,61.47%and 64.88%.（6）Compared with the other two composite catalysts,the Ag-S-STO composite system exhibits better photocatalytic activity under sunlight.This activity is related to the modification of the body surface lattice of sulfur and also to the SPR effect of metallized silver particles.