Synthesis of (H3O)TiNbO5·0.26H2O via hydronium (H3O+) ion-exchange reaction and its photocatalytic activity for H2 evolution from aqueous methanol solution

Ion exchanged potassium titanoniobate as photocatalyst under visible light

“…1. Potassium ion is exchangeable by other ions such as H + [18], Li + [13], H 3 O + [16], and dye [17]. This shows that the photo-catalytic property of the layer-structured material may be improved by changing inter-layer materials and layer-materials through some sort of interaction.…”

“…The layer structured composite materials containing TiO 2 and CdS system [14], and doped material such as Mn, Co and Ni in InTaO 4 [15] have been reported to show good photo-catalytic property. KTiNbO 5 which is a layer-structured material was studied as a photocatalyst [16,17]. KTiNbO 5 consisted of titanium(Ti), niobium(Nb) and oxygen(O) (TiNbO 5 ) octahedral sheet and potassium(K) is sited in the space between neighboring two sheets [18][19][20].…”

Synthesis of potassium titanoniobate in supercritical and subcritical water and investigations on its photocatalytic performance

“…The hydronium exchanged form (H 3 OTiNbO 5 ) was prepared via the ion-exchange reaction from KTiNbO 5 with hydrochloric acid. Pt loaded H 3 OTiNbO 5 photocatalyst showed a higher photocatalytic activity than that of the Pt loaded parent KTiNbO 5 [25]. Additionally, KTiNbO 5 nanosheets could be obtained by simple exfoliation method using tetraalkylammonium compounds [26].…”

Microstructural control of new intercalation layered titanoniobates with large and reversible d-spacing for easy Na + ion uptake

“…In this respect, layered KTiNbO 5 (KTNO) [ n = 2 members of the family A x M 2 n O 4 n +2 ( 19 )] is of great interest because of its unique structure with alternating K and M layers and a large d-spacing of ~0.94 nm, which can accommodate foreign species, including organic and inorganic species, into the layers. Moreover, potassium can be removed and exchanged for other cations, such as H + , Li + , and NH 4 + ( 20 – 22 ). The appealing feature of those new compounds is that they almost retain their original structure and c parameter even after the cation exchange.…”