Experimental Study On The Photocatalytic Degradation Of Bisphenol A By Fe-TiO₂/C Composite

BPA has estrogenic properties,which is a potentially dangerous pollutant.As a catalyst,the degradation of BPA by TiO₂is highly efficient,non-toxic and green.In this study,n-tetrabutyl titanate was used as the titanium source,ferric nitrate was used as the iron source,and the graphene oxide and fullerene were used as the substrate,two photocatalysts of Fe-TiO₂/GO and Fe-TiO₂/C₆₀were successfully prepared by the sol-gel method.Fe-TiO₂/GO and Fe-TiO₂/C₆₀composite materials reflect their physical and chemical properties through various characterization methods such as XRD,FT-IR,UV-Vis,SEM,and BET.The reason for the difference in photocatalytic performance between different catalysts was explored.The experimental results showed that the optimal preparation conditions for Fe-TiO₂/GO and Fe-TiO₂/C₆₀composite photocatalysts were the amount of GO and C₆₀is 5mg,the iron doping ratio was 2%,the calcination temperature was 400℃,and the calcination time was 120min.The synthesized Fe-TiO₂/GO and Fe-TiO₂/C₆₀catalysts were used for the catalytic experiment of BPA in water under the irradiation of ultraviolet light with a light radiation intensity of 980μw/cm².After 100 minutes of photocatalysis,The degradation rate of BPA by TiO₂was only 34.33%.The degradation rate of BPA by Fe-TiO₂/GO and Fe-TiO₂/C₆₀were 90.96%and 88.58%,respectively,which were greatly improved compared to TiO₂.Due to the lack of electrons in C₆₀,photo-generated electrons were combined with it first,and the generation of·O₂^-was affected,so the photocatalytic degradation of BPA was worse than Fe-TiO₂/GO.In this study,the structure,morphology,and material composition of the prepared catalyst were characterized.The characterization results showed that the introduction of iron,GO and C₆₀effectively inhibited the agglomeration of TiO₂and helped to increase the specific surface area of the catalyst.The specific surface area of TiO₂,Fe-TiO₂,Fe-TiO₂/GO and Fe-TiO₂/C₆₀were 37.73m²/g,48.15m²/g,63.31m²/g and52.11m²/g,respectively.The BET results showed that the specific surface area of Fe-TiO₂,Fe-TiO₂/GO and Fe-TiO₂/C₆₀were 1.28,1.67 and 1.38 times that of TiO₂,respectively.The specific surface area was significantly increased.The introduction of GO,C₆₀and Fe enhanced the light absorption performance of the catalyst,and the maximum light absorption edge was broadened from 400nm to 550nm.The band gaps of TiO₂,Fe-TiO₂,Fe-TiO₂/GO and Fe-TiO₂/C₆₀were 3.20e V,2.90e V,2.96e V and2.93e V,respectively.The band gap was significantly reduced and the catalytic activity was significantly improved.This study explores the photocatalytic mechanism of composite materials through quenching experiments.The analysis of the results showed that BPA was initially degraded under the action of·O₂^-and the holes to generate intermediate products,and then completely oxidized by the holes.