A Post‐Spinel NaFeSnO4 as Novel Narrow Band Gap Photocatalyst for Visible Light Assisted Decomposition of Crystal Violet Dye

Abstract SnO 2 is a wide bandgap photocatalyst, and Fe 2 O 3 is susceptible to the recombination of photocharges produced is heterogenized in the form of NaFeSnO 4 . NaFeSnO 4 with post‐spinel structure having one‐dimenisonal (1D) channel is explored first time as photocatalyst. Phase purity and structure of NaFeSnO 4 was examined using X‐ray diffraction (XRD). Particle morphology, light absorption behavior, band‐gap energy estimation and surface area of NaFeSnO 4 were evaluated using various instrumental techniques. Extent of charge separation and charge transfer was investigated using photoluminescence (PL) analysis and electrochemical impedance spectroscopy (EIS). Photocatalytic performance of NaFeSnO 4 was examined for degradation of crystal violet dye by irradiating visible light. The photocatalytic properties of NaFeSnO 4 are compared with the precursor oxides Fe 2 O 3 and SnO 2 . It has been demonstrated first time that NaFeSnO 4 is an efficient visible light active photocatalyst than Fe 2 O 3 and SnO 2 for degradation of crystal violet dye.