By controlling theannealingtemperature, we obtained the optimum crystalline structure for nitrogen-dopedhexaniobate (K4Nb6O17) for efficient decomposition of rhodamine B via visible-light photocatalysis. Theannealingtemperature for hexaniobate was closely related to the crystallinity and charge recombination rate. The rate of charge recombination could be controlled by varying theannealingtemperature. The optimum photocatalyticactivityofhexaniobate with or without nitrogen doping could be obtained at an annealingtemperature at 400 degrees C. The long lifetime of photogenerated carriers was evident from measurements of hydroxyl radical concentrations resulting from catalysis by nitrogen-dopedhexaniobate. The results indicate that improvements inphotocatalyticactivityofthe annealed materials were mainly attributed to the decrease in recombination rate and to the high rate of separation of photogenerated carriers.
Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Lab Ecomat & Sustainable Technol, Urumqi 830011, Xinjiang, Peoples R China;Chinese Acad Sci, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Xinjiang, Peoples R China
Liu, Huayun,Wang, Huanhuan,Li, Shouzhu. The role of annealing temperature in enhancing the photocatalytic activity of nitrogen-doped hexaniobate[J]. Materials Science in Semiconductor Processing,2014,25(9):294-300.