Preparation, characterization and photocatalytic activity studies of transition metal ion doped K2Ta2O6

M2+-doped K2Ta2O6 photocatalysts with defect pyrochlore structure were successfully synthesized by ion-exchange method. The M2+-doped catalysts have shown higher photocatalytic degradation of MB than parent K2Ta2O6. [Display omitted] Cation doping is one of the simplest methods to improve the photoc...

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Bibliographic Details
Published in:Polyhedron 2022-03, Vol.214, p.115620, Article 115620
Main Authors: Angineni, Rani, Venkataswamy, Perala, Ramaswamy, Kadari, Raj, Shiva, Veldurthi, Naveen Kumar, Vithal, Muga
Format: Article
Language:English
Subjects:
Cation doping
K2Ta2O6
Methylene blue
Surface hydroxyl species
Visible light absorption
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Summary:M2+-doped K2Ta2O6 photocatalysts with defect pyrochlore structure were successfully synthesized by ion-exchange method. The M2+-doped catalysts have shown higher photocatalytic degradation of MB than parent K2Ta2O6. [Display omitted] Cation doping is one of the simplest methods to improve the photocatalytic activity. Herein, we attempted to improve the photocatalytic activity of K2Ta2O6, by doping with M2+ (M = Mn, Co and Ni) ions. The M2+-doped K2Ta2O6 were synthesized by facile ion-exchange method and characterized by techniques like XRD, SEM-EDS, TEM-SAED, N2 adsorption–desorption, FT-IR, XPS, UV–Vis DRS and PL. The photocatalytic activity of these catalysts was studied for the degradation of methylene blue (MB) dye under visible light irradiation. All the M2+-doped KTO exhibited improved photocatalytic activity towards the degradation of MB. Among these catalysts, Mn-K2Ta2O6 has shown 93% degradation efficiency in 180 min of irradiation. Scavenger experiments were performed to unravel the degradation mechanism. The stability of Mn-K2Ta2O6 and its photocatalysis mechanism were also presented.
ISSN:0277-5387
DOI:10.1016/j.poly.2021.115620