Studies on Synthesis, Characterization and Properties of Fe-V Co-doped TiO2 Catalyst
|School||Fujian Normal University|
|Keywords||coprecipitation doped titanium dioxide methylene blue adsorption photocatalytic activity characterization|
The paper probes into a series of modified nano-TiO2 via different preparation methods. The effects of different system variables like preparation conditions (sources of titanium、doping elements、doping ratioes、calcinable temperatures) and reaction conditions (different adsorbent dosage、pH value、photocatalytic activity) of catalysts are also investigated. The physicochemical properties of the catalysts are measured by XRD、TG-DTG、FT-IR、SEM、EDS、BET、UV-Vis DRS、XRF、TEM、XPS、ESR and ICP. The experimental results suggest that co-doped TiO2 synthesized via coprecipitation has an excellent ability in adsorbing, utilizing titanium tetrachloride as precursors, it also has photocatalytic activities in degradation of dye under visible light after adsorption. The Fe-V-TiO2 (the doped mole ratio of Ti:Fe:V is 1:0.15:0.3, calcined at 400℃for 2 h) exhibits the best adsorbtion activity on methylene blue (MB) solution. The decolourization rate of MB (100 ppm) surpasses 99.01% within 60 min dark reaction (the catalyst dosage is 1.50 g/L, in neutral condition). Its mineralization rate of MB rises to 89.56% within 8 h, which degrades the pollutants in wastewater effectively. The COD of actual high concentrated wastewater reduces from 1938 mg/L to 899.56 mg/L. Co-doped increases the specific surface area, and expands the response scope of TiO2 in visible light. Samples in the solutiion can produce much more O2-, which exhibits excellent oxidation ability. Fe-V-TiO2 sample can be acquired by mixing iron in Fe3+ form and vanadium in V5+ form. Such solution is of a much lower vanadium density than the maxium one in GB 3838-2000, which reveals that such a modified catalyst is of considerable significance in practical application.