Preparation Of Acidification Iron Oxide/TiO₂ Nano Wires And Its Visible Light Photocatalytic Performance

As one kind of semiconductor material,TiO2 has been widely used in the storage of the solar energy and photocatalytic degradation of pollutants in water due to its unique chemical stability,high efficient,non-toxic and low cost.Ti02 nanowires can provide direct conductive pathways of photogenerated electrons and reduce the defects of grain boundaries for its larger specific surface area and unique catalytic performance.Thence it can be an important trend of Ti02 material research.In this paper,Ti02 nanowires with Fe2O3 nanoparticles loaded were successfully prepared by hydrothermal-solvothermal method using P25 as the Ti source,and then make sulfur functional modification of supported catalysts through sulfuric acid impregnating method.TEM,XRD,BET,FT-IR and XPS techniques were applied to character morphology,crystalline phase,specific surface area,pore structure,surface functional groups and element valence of the catalysts.The photocatalytic activity of samples was evaluated by adsorption and photodegradation of azo dye reactive brilliant red X-3B as target pollutant with 150 w sodium lamp as light source.The effects of catalyst preparation and reaction conditions on its properties for degradation of X-3B were studied in detail.Meanwhile,the stability of catalyst was evaluated by recycle experiments and iron leaching.The results showed that the crystal type of the TNWs was Ti02(B)/anatase mixed phase after 500 ? calcination.An obvious increase in the BET surface areas and pore volume was observed for samples with transition metal loading and acid functionalization.The combined effect of iron oxide nanoparticles and surface acidic sites would extend band gap response into visible regime and it reduced the electron-hole pairs composite probability,which substantially increase the photocatalystic activity reactivity of Ti02.The degradation efficiency of X-3B in 120 min was 98%for the first oxidation when the initial conditions were[X-3B]=100 mg L-1,[Cat.]= 0.25 g L-1,pH =6.0,[H2O2]= 9.8 mmol L-1 under room temperature.The X-3B degradation performance on the reused catalyst showed a slight difference with the first oxidation cycle.The degradation efficiency of X-3B was above 90%for the third oxidation cycle indicating that prepared catalyst has long-term stability and industrial application potential.