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Synthesis, Characterization and Photocatalytic Activity of Ag + ‐ and Sn 2+ ‐Doped KTi 0.5 Te 1.5 O 6
Author(s) -
Guje Ravinder,
Gundeboina Ravi,
Reddy Jitta Raju,
Veldurthi Naveen Kumar,
Kurra Sreenu,
Vithal Muga
Publication year - 2016
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12559
Subject(s) - photocatalysis , doping , band gap , materials science , nuclear chemistry , methylene blue , visible spectrum , photochemistry , catalysis , analytical chemistry (journal) , chemistry , organic chemistry , optoelectronics
In this study, the photocatalytic dye degradation efficiency of KTi 0.5 Te 1.5 O 6 synthesized through solid‐state method was enhanced by cation (Ag + /Sn +2 ) doping at potassium site via ion exchange method. As prepared materials were characterized by XRD, SEM‐EDS, IR, TGA and UV–Vis Diffuse reflectance spectroscopic (DRS) techniques. All the compounds were crystallized in cubic lattice with Fd 3 ¯ m space group. The bandgap energies of parent, Ag + ‐ and Sn +2 ‐doped KTi 0.5 Te 1.5 O 6 materials obtained from DRS profiles were found to be 2.96, 2.55 and 2.40 eV, respectively. Photocatalytic efficiency of parent, Ag + ‐ and Sn +2 ‐doped materials was evaluated against the degradation of methylene blue (MB) and methyl violet (MV) dyes under visible light irradiation. The Sn +2 ‐doped KTi 0.5 Te 1.5 O 6 showed higher activity toward the degradation of both MB and MV dyes and its higher activity is ascribed to the lower bandgap energy compared to the parent and Ag + ‐doped KTi 0.5 Te 1.5 O 6 . The mechanistic degradation pathway of methylene blue (MB) was studied in the presence of Sn 2+ ‐doped KTi 0.5 Te 1.5 O 6 . Quenching experiments were performed to know the participation of holes, super oxide and hydroxyl radicals in the dye degradation process. The stability and reusability of the catalysts were studied.