Study on the Synthesis, Modification and Photocatalytic Properties of SrTiO3 and K2La2Ti3O10 for Water Decomposition

　　Study on the Synthesis, Modification and Photocatalytic Properties of SrTiO3 and K2La2Ti3O10 for Water Decomposition
　　Hydrogen is an alternative energy source with high efficiency and pollution free. The photocatalytic splitting of water to hydrogen using semiconductor as photocatalyst is a potentially clean and renewable method which is of both theoretical and practical significance. In this paper, the influence of metal elements doping and second supported component loading on the photoctalytic activity of CoO/SrTiO3 were studied. Meanwhile, a new route for synthesis of layered oxide K2La2Ti3O10 with solid-state reaction method was investigated.The photocatalytic properties of SrTiO3 doped with the first series transition metal elements, such as Zn, Cr, Mn, Fe, Co, Ni and Cu, were studied. The results show that Zn doping can improve the photocatalytic activity to a great neodymium magnets degree, while others lead to the decline of photocatalytic activity. Then Zn doped SrTiO3 were investigated in detail from doping amount, loading amount of cocatalyst CoO and calcination temperature, and it is found that the activity of Zn-doped SrTiO3 get an increase of about 150% in the optimized conditions.
　　The influence of rare earth element La as dopant on the photocatalytic activity of SrTiO3 was investigated. The optimum values of doping concentration, loading amount of CoO and calcination temperature were determined by experiments. From the results, we can see that the activity is 50% higher than the original one with the optimum doping concentration. Moreover, La doping could decrease the crystal size of SrTiO3 and increase the suitable loading amount of CoO gradually with the increase of doping concentration. The La or Zn doped catalysts were studied in detail to obtain reaction mechanism information in conjuction with XRD, SEM, XPS, UV-vis diffuse reflection, BET, etc. characterization techniques. The effect of La or Zn dopingon the photocatalytic activity of CoO/SrTiO3 for decomposition of water has never been reported so far.The influence of transition metal elements as second supported components on the photocatalytic activity of CoO/SrTiO3 was http://www.chinamagnets.biz investigated. The results show that the activity was improved obviously with La loading. Moreover, Ag addition to CoO/ SrTiCh can not only improve the activity, but also enhance the stability of photocatalyst. The suitable amounts of loaded components were determined by experiments.A new route for synthesis of K^I^TiaOio via solid-state reaction method starting from Ti0(0H)2 formed by hydrolysis of tetrabutyl titanate was put forward for the first time. Then, the synthesis conditions, such as KOH excess %, calcination temperature, etc. were optimized. The effect of cocatalyst component on the phocatalytic activity of K2La2Ti30io was also investigated. It is found that Ag, CoO and NiO are all the effective cocatalyst to K2La2Ti30io- Among them, NiO performs best and its suitable loading amount was determined.