Important Role of Strontium Atom on the Surface of SrKTaO with a Tetragonal Tungsten Bronze Structure to Improve Adsorption of CO for Photocatalytic Conversion of CO by HO.

SrKNaTaO, which belongs to the Na-substituted SrKTaO series of compounds with a tetragonal tungsten bronze structure, was fabricated using a flux mixture of KCl and NaCl (KCl/NaCl molar ratio = 55:45). It exhibited higher CO formation rate (94.6 μmol h), better selectivity for CO evolution (85.

Sodium Cation Substitution in SrKTaO toward Enhancement of Photocatalytic Conversion of CO Using HO as an Electron Donor.

The K and Sr cations (K and Sr) in a SrKTaO photocatalyst were found to be easily substituted by Na cations (Na) to form Sr K Na TaO by a facile one-pot flux method using a mixture of potassium chloride (KCl) and sodium chloride (NaCl). Sr K Na TaO fabricated using a mixture of KCl and NaCl with a Ag cocatalyst showed enhanced photocatalytic activity without apparent change in selectivity toward CO for the photocatalytic conversion of CO using HO. The present study demonstrates that the flux treatment significantly affected the phase, morphology, band gap, and surface Sr composition of the catalyst owing to the substitution of K and Sr for Na.