Structural Property and Catalytic Activity of New In₂YbSbO₇ and Gd₂YbSbO₇ Nanocatalysts under Visible Light Irradiation

Abstract

In 2 YbSbO 7 and Gd 2 YbSbO 7 were prepared first, while the structural and photocatalytic properties of them were investigated. In 2 YbSbO 7 and Gd 2 YbSbO 7 were crystallized with pyrochlore-type structure, cubic crystal system by space group Fd3m. The lattice parameters a for In 2 YbSbO 7 and Gd 2 YbSbO 7 were 10.340277 and 10.639527 Å. The band gap energies of In 2 YbSbO 7 and Gd 2 YbSbO 7 were 2.361 and 2.469 eV. In 2 YbSbO 7 and Gd 2 YbSbO 7 could photodegrade rhodamine B under visible light irradiation and they owned higher catalytic activity compared with Bi 2 InTaO 7 . Furthermore, In 2 YbSbO 7 showed higher catalytic activity compared with Gd 2 YbSbO 7 . The photocatalytic degradation of rhodamine B with In 2 YbSbO 7 , Gd 2 YbSbO 7 and Bi 2 InTaO 7 followed the first-order reaction kinetics, and the first-order rate constant was 0.02466, 0.01430, and 0.00329 min -1 . After visible light irradiation for 235 and 255 min with In 2 YbSbO 7 and Gd 2 YbSbO 7 as catalysts, complete removal and mineralization of rhodamine B was observed. The photocatalytic degradation pathway of rhodamine B was obtained in this experiment.

Fabrication and high photocatalytic performance of noble metal nanoparticles supported on 3DOM InVO4–BiVO4 for the visible-light-driven degradation of rhodamine B and methylene blue

“…7A), whereas the degradation of RhB was a first-order reaction toward RhB concentration (Fig. 7B), similar to the cases reported in the literature [26,28,37]. Table 3 summarizes the kinetic parameters of the samples for the degradation of dyes.…”

“…This result indicates the great role of plasmonic metals. The photocatalytic activities of the Au/InBi-3D samples were higher than those of PANI-modified core-shell mesoporous TiO 2 microspheres [28], Zn x Cd 1−x S/TiO 2 nanocomposites [34], BiVO 4 with a hierarchical heterostructure [37], and A 2 B 2 O 7 compounds [26]. In the dye mixture degradation over the InBi-ref, InBi-3D, and Au/InBi-3D samples, the k values for either MB or RhB degradation decreased, especially over the first sample the k values decreased to 0.0530 mg/(L min) and 0.0050 min −1 , respectively.…”

“…In the meanwhile, loading a trace amount of nanoscale noble metals could undoubtedly enable the 3DOM architecture to capture and transform light energy more effectively due to their plasmonic behaviors. As important industrial dyes that are resistant to biodegradation and direct photolysis, MB or RhB is the most used model pollutant [24][25][26][27]. Hence, we evaluate photocatalytic activities of xM/InBi-3D for the degradation of RhB, MB and RhB + MB.…”

Electrical transport properties of manganese containing pyrochlore type semiconducting oxides using impedance analyses

“…[1][2][3][4]. Among these materials, manganese containing oxides have attracted considerable interest in fundamental physics and potential technological challenges [5][6][7].…”

Fe4I3O24H15: A novel semiconductor with high performance in photodegradation of rhodamine B dyes under visible light irradiation

“…1e)shows that it is visible-light-responsive, and the absorption band edge is around the wavelength (k) of 540 nm. The band gap of Fe 4 I 3 O 24 H 15 can be calculated by the following equation using the optical absorption data near the band edge[27,28]: aht = A(ht À E g ) n , where a, t, A and E g are absorption coefficient, light frequency, proportionality constant and band gap, respectively. In this formula, n decides the characteristics of the transition in a semiconductor, i.e., direct transition (n = 0.5) or indirect transition (n = 2).…”