Pb-N共掺杂TiO_2纳米晶的制备、表征及光催化性能的研究

Preparation,characterization and photo-catalysis of TiO_2 nanoparticles co-doped with nitrogen and plumbum

通过溶胶凝胶法制备了Pb掺杂TiO2纳米晶、在管式炉中NH3(67%)/Ar气氛下制备N掺杂及Pb-N共掺杂的TiO2纳米晶,利用XRD,XPS,SEM及UV-VIS对样品进行了表征,并研究了样品对甲基橙溶液的降解.结果表明:Pb掺杂可以降低纳米晶的粒径,Pb-N共掺杂可以起到协同作用,降低样品的带隙能,提高样品对可见光的吸收,Pb-N共掺杂的TiO2在可见光作用下表现出较高的催化活性,0.5%Pb-N共掺杂的TiO2,可将20 mg/L的甲基橙水溶液在35 min内完全降解.

The Pb doped titanium dioxide nanoparticles were prepared by the sol-gel method. Nanoparticles of TiO2 powder codoped with Pb and N were prepared using a sol-gel method followed by being calcined for two hours at a temperature ranging from 500 to 600 ℃ in a NH3/Ar atmosphere. Particle appearances were characterized by XPS, XPS, SEM and UV-VIS, and the pho- to-catalysis of TiO2 was studied by degrading methyl orange. Results indicate that Pb doping could decrease the particle size of nanopartieles, and Pb-N co-doping has a synergistic effect that could decrease the band gap energy and increase the visible absorption capacity of samples. Pb-N co-doped TiO2 appears to have higher photo-catalysis activity under visible light than TiO2 and Pb doped TiO2. 0.5 % Pb-N co-doped TiO2 could degrade aqueous methyl orange （20 mg/L） within 35 minutes.