（La, N） co-doped TiO2 photocatalysts were synthesized using TiC14 sol-gel autoignidng synthesis （SAS） starting from a complex compound system of TiCl4-La（NO3）3-citric acid-NH4NO3-NHyH2O, in which the （La, N） c...（La, N） co-doped TiO2 photocatalysts were synthesized using TiC14 sol-gel autoignidng synthesis （SAS） starting from a complex compound system of TiCl4-La（NO3）3-citric acid-NH4NO3-NHyH2O, in which the （La, N） co-doped process was accompushed in the formation of TiO2 nanocrystals. The prepared samples were characterized by using X-ray diffraction （XRD）, X-ray photoemission spectroscopy （XPS） and UV-vis diffuse reflectance spectra. The results indicated that nitrogen and lanthanum were incorporated into the lattice and interstices of titania nanocrystals, which resulted in narrowing the band gap and promoting the separation of photoexcited hole-electron pairs, respectively, and showing expected red-shifts and enhanced photocatalytic activity under visible light. The mechanism on nitrogen doping and enhancement in photocatalyfic activity of （La, N） co-doped titania by SAS was discussed in detail.展开更多
Autoigniting synthesis of gel from Ba(NO_3)_2, TiO(NO_3)_2 and C_6H_8O_7centre dot H_2O aqueous solution was investigated at an initial temperature of 600 deg C andtetragonal BaTiO_3 nanopowder with particle size of 8...Autoigniting synthesis of gel from Ba(NO_3)_2, TiO(NO_3)_2 and C_6H_8O_7centre dot H_2O aqueous solution was investigated at an initial temperature of 600 deg C andtetragonal BaTiO_3 nanopowder with particle size of 80nm was prepared. It is indicated that thespecific surface area of the combustion product before and after calcinations is 14.74 m^2/g and12.49 m^2/g, respectively. The combustion wave is composed of solid phase reaction zone and gaseousphase flame reaction zone. The combustion flame temperature is 1 123 K derived from thermocouplemeasurement. The characteristics and densification behavior of the sol-gel autoigniting synthesizedBaTiO_3 nanopowder were investigated.展开更多
文摘（La, N） co-doped TiO2 photocatalysts were synthesized using TiC14 sol-gel autoignidng synthesis （SAS） starting from a complex compound system of TiCl4-La（NO3）3-citric acid-NH4NO3-NHyH2O, in which the （La, N） co-doped process was accompushed in the formation of TiO2 nanocrystals. The prepared samples were characterized by using X-ray diffraction （XRD）, X-ray photoemission spectroscopy （XPS） and UV-vis diffuse reflectance spectra. The results indicated that nitrogen and lanthanum were incorporated into the lattice and interstices of titania nanocrystals, which resulted in narrowing the band gap and promoting the separation of photoexcited hole-electron pairs, respectively, and showing expected red-shifts and enhanced photocatalytic activity under visible light. The mechanism on nitrogen doping and enhancement in photocatalyfic activity of （La, N） co-doped titania by SAS was discussed in detail.
文摘Autoigniting synthesis of gel from Ba(NO_3)_2, TiO(NO_3)_2 and C_6H_8O_7centre dot H_2O aqueous solution was investigated at an initial temperature of 600 deg C andtetragonal BaTiO_3 nanopowder with particle size of 80nm was prepared. It is indicated that thespecific surface area of the combustion product before and after calcinations is 14.74 m^2/g and12.49 m^2/g, respectively. The combustion wave is composed of solid phase reaction zone and gaseousphase flame reaction zone. The combustion flame temperature is 1 123 K derived from thermocouplemeasurement. The characteristics and densification behavior of the sol-gel autoigniting synthesizedBaTiO_3 nanopowder were investigated.
