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Title: Transition metal ion (Ni2+, Cu2+ and Zn2+) doped defect pyrochlore, KTaTeO6: Synthesis, characterization and photocatalytic studies
Authors: Sudheera, M
Venkataswamy, P
Ramaswamy, K
Ravi, G
Chittibabu, N
Vithal, M
Keywords: KTaTeO6;Transition metal ions;Ion-exchange method;Bandgap energy;MB degradation;OH radicals
Issue Date: Jun-2021
Publisher: CSIR-NIScPR, India
Abstract: One of the strategies to decrease the bandgap energy and increase the optical absorption of the catalysts is to dope with transition metal ions. In this paper, the results obtained for the degradation of methylene blue (MB) pollutant in the presence of M2+ (M = Ni, Cu, and Zn) doped KTaTeO6 (M-KTTO) upon visible light irradiation are presented. The parent KTaTeO6 and the M-KTaTeO6 were prepared by solid-state and ion-exchange methods, respectively. All the samples were characterized by XRD, SEM/EDX, FT-IR, UV-vis DRS, XPS, and PL techniques. The metal ion doping in place of K+ has influenced the electronic and optical properties considerably. The doping of M2+ into KTTO lattice has narrowed the bandgap energy, increased the visible light absorbance leading to higher photocatalytic activity. The M-KTTO materials show higher photocatalytic activity compared to parent KTTO, particularly Cu-KTTO. The scavenging experiments indicate that •OH radicals are the main active species involved in the photodegradation of MB. The Cu-KTTO is chemically stable and can be used for at least up to five cycles. The mechanistic pathway of MB degradation was proposed over Cu-KTTO.
Page(s): 812-823
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.60A(06) [June 2021]

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