Development of new photocatalysts and luminescent materials with one-dimensional pillared structures

具有微孔结构的K_3Ta_3Si_2O_<13>具有化学计量量的水裂解成H_2和O_2的活性。此外，还发现碱和碱土钽酸盐是催化水裂解的活性光催化剂。其中，含NiO的NaTaO_3光催化剂活性最高，在270 nm处，NiO/NaTaO_3光催化剂的量子产率可达30%左右。另一方面，带隙为2.3 eV的BiVO_4在可见光照射下对硝酸银水溶液中O_2的演化具有活性。带隙为2.5 eV的Cu-ZnS在可见光照射下对亚硫酸钾水溶液中H_2的析出也有积极作用。BiVO_4和Cu-ZnS光催化剂的活性与WO_3和Pt/CdS的活性相当，这是可见光下具有代表性的光催化剂。具有层状结构的In_2O_3(ZnO)_m在可见光照射下能从含有牺牲试剂的水溶液中生成H_2或O_2。Ga_<2-x>In_xO_3固溶体是一种独特的光催化剂，其能带结构可以通过改变其组成来控制。

K_3Ta_3Si_2O_<13> with a microporous structure showed an activity for water splitting into H_2 and O_2 in stoichiometric amounts. Moreover, alkali and alkali earth tantalates were found to be active photocatalysts for the water splitting. Among them, NaTaO_3 with a NiO co-catalyst was the most active and the quantum yield of the NiO/NaTaO_3 photocatalyst at amounted to ca. 30% at 270 nm. On the other hand, BiVO_4 with 2.3 eV band gap showed an activity for O_2 evolution from an aqueous silver nitrate solution under visible light irradiation. Cu-ZnS with 2.5 eV band gap was also active for H_2 evolution from an aqueous potassium sulfite solution under visible light irradiation. The activities of BiVO_4 and Cu-ZnS photocatalysts were comparable to those of WO_3 and Pt/CdS which were representative photocatalysts working under visible light irradiation. In_2O_3(ZnO)_m with a laminal structure was able to produce H_2 or O_2 from aqueous solutions containing sacrificial reagents under visible light irradiation. Ga_<2-x>In_xO_3 solid solutions have arisen as unique photocatalysts whose band structure was controlled by changing the composition.