Fe^(3+)-TiO_(2)/ACF复合材料的制备及其性能研究

Preparation and properties of Fe^(3+)-TiO_(2)/ACF composites

为了提高二氧化钛/活性碳纤维(TiO_(2)/ACF)复合材料处理有害气体的降解率,使用Fe^(3+)对TiO_(2)进行改性,采用溶胶-凝胶法制备Fe^(3+)-TiO_(2)/ACF,通过荧光光谱(PL)、X射线衍射(XRD)、BET比表面积、扫描电镜(SEM)对材料进行性能表征,并以氨气(NH3)等气体为目标降解物,研究Fe^(3+)-TiO_(2)/ACF对目标降解物的降解效果。结果表明:经Fe^(3+)掺杂改性的TiO_(2)光催化活性显著提高,Fe^(3+)∶Ti4+摩尔比为1∶200时,其光催化活性最高。随着Fe^(3+)掺杂量的增加,TiO_(2)的平均晶粒大小逐渐降低。负载Fe^(3+)-TiO_(2)后ACF的比表面积降低。使用Fe^(3+)∶Ti4+(1∶200)与ACF进行复合后,对目标降解物的降解效率比TiO_(2)/ACF提高了16%~21%,降解效果得到显著提升,对有机气体的降解率高于无机气体。

In order to improve the degradation rate of titanium dioxide/activated carbon fiber(TiO_(2)/ACF)composites in dealing with harmful gases,Fe^(3+)was used to modify TiO_(2),and Fe^(3+)-TiO_(2)/ACF was prepared by sol-gel method.The properties of the material were characterized by PL,XRD,BET and SEM.Taking ammonia(NH3)and other gases as target degradants,the degradation effect of Fe^(3+)-TiO_(2)/ACF on the target degradants was studied.The results showed that the photocatalytic activity of TiO_(2) modified by Fe^(3+)doping was significantly improved.When the molar ratio of Fe^(3+)∶Ti4+was 1∶200,the photocatalytic activity was the highest.With the increase of Fe^(3+)doping amount,the average grain size of TiO_(2) decreased gradually.The specific surface area of ACF decreased after loading Fe^(3+)-TiO_(2).After using Fe^(3+)∶Ti4+(1∶200)to compound with ACF,the degradation efficiency of the target degradants was increased by 16%~21%compared with TiO_(2)/ACF,and the degradation effect was significantly improved.The degradation rate of organic gases was higher than that of inorganic gases.