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Transition metal ion (Ni2+, Cu2+ and Zn2+) doped defect pyrochlore, KTaTeO6: Synthesis, characterization and photocatalytic studies
Indian Journal of Chemistry, Section A ( IF 0.412 ) Pub Date : 2021-07-07
M Sudheera, P Venkataswamy, K Ramaswamy, G Ravi, N Chittibabu, M Vithal

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.

中文翻译:

过渡金属离子(Ni2+、Cu2+ 和 Zn2+)掺杂缺陷烧绿石、KTaTeO6:合成、表征和光催化研究

降低带隙能量和增加催化剂光吸收的策略之一是掺杂过渡金属离子。在本文中,介绍了在 M2+(M = Ni、Cu 和 Zn)掺杂的 KTaTeO6 (M-KTTO) 存在下,在可见光照射下降解亚甲蓝 (MB) 污染物的结果。母体 KTaTeO6 和 M-KTaTeO6 分别通过固态和离子交换方法制备。所有样品均通过 XRD、SEM/EDX、FT-IR、UV-vis DRS、XPS 和 PL 技术进行表征。代替 K+ 的金属离子掺杂显着影响了电子和光学特性。M2+ 掺杂到 KTTO 晶格中缩小了带隙能量,增加了可见光吸收率,从而提高了光催化活性。与母体 KTTO,尤其是 Cu-KTTO 相比,M-KTTO 材料显示出更高的光催化活性。清除实验表明•OH自由基是参与MB光降解的主要活性物质。Cu-KTTO 具有化学稳定性,可使用至少五个循环。在 Cu-KTTO 上提出了 MB 降解的机制途径。
更新日期:2021-07-07
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