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

Catalytic dechlorination of polychlorinated biphenyls in subcritical water by Ni/Fe nanoparticles

“…But it is should be noted that physicochemical properties of reaction medium can influence dechlorination performance significantly. Subcritical water, which is also defined as hot compressed water above 200 • C and at sufficiently high pressure, has been widely used for various chemical reactions in terms of its extraordinary properties as compared to ambient water, such as hydrolysis, synthesis, reductions and so on [10][11][12][13]. Enhanced dehalogenation of PCBs and perfluorooctanesulfonate (PFOS) were observed with microscale iron powders in subcritical water [14][15][16].…”

A Novel Seed-Assisted Route for Fabricating Potassium Titanoniobate Photocatalytic Nanomaterials

“…The ion exchange reaction and the photocatalytic characterization were carried out with similar process reported previously. 16 The ruthenium loading was confirmed with ICP analysis as ca. 1.0 wt %.…”

“…Up to date, well-crystallined KTiNbO 5 powders could be obtained by using solid state reaction, sol-gel method and high temperature hydrothermal method in supercritical water system. [12][13][14][15][16] In comparison with the solid state method and sol-gel method, preparation in aqueous system had noticeable advantages in forming regular particle morphology, reduced particle size and large BET surface area. But the synthesis of KTiNbO 5 powders in supercritical water system always employed severe reaction condition, such as working temperature around 400 C and pressure inside the vessel usually above 24 MPa.…”

Rapid Production of Micro- and Nano-particles Using Supercritical Water

“…Potassium titanoniobate (KTiNbO 5 ) crystalline rectangular powders with large surface area for high photocatalytic performance were successfully synthesized [65][66]. The synthesized KTiNbO 5 powders with ruthenium loading were used for the photocatalytic hydrogen evolution from aqueous methanol solution [66].…”

“…The synthesized KTiNbO 5 powders with ruthenium loading were used for the photocatalytic hydrogen evolution from aqueous methanol solution [66]. A single phase of K 4 Nb 6 O 17 was formed under SubCW conditions, while mixed phases of K 4 Nb 6 O 17 and KNbO 3 were obtained under supercritical conditions [67].…”