Preparation, characterization and photocatalytic activity evaluation of NaBiO3·2H2O and NaBiO3·xH2O nanosheets

Crystal Structure, Thermal Behavior, and Photocatalytic Activity of NaBiO3·nH2O

“…Tauc plot estimations of band gap energy for polycrystalline samples has been reported to give accurate values for monazite-type oxides Figure shows band gap energies of 2.4 and 2.5 eV for NBH and NBO, respectively, which are similar to previously reported data. ,, …”

“…33 Figure 7 shows band gap energies of 2.4 and 2.5 eV for NBH and NBO, respectively, which are similar to previously reported data. 16,20,24 Photocatalytic Activity and DOS Calculations. The photocatalytic activities of the hydrated NBH and the dehydrated NBO compounds were characterized by the decomposition of phenol at an initial concentration of 20 ppm using a 0.15 g sample in 50 mL of ultrapure water.…”

“…The crystal structure of dehydrated NaBiO 3 (NBO) was successfully refined as an ilmenite structure assigned to the R 3̅ space group, , and other studies reported that NBH changes to an ilmenite-type structure after dehydration above 140 °C. , For the first time, we refine the NBH crystal structure using synchrotron powder X-ray diffraction (SPXRD) data and describe its structural changes from room temperature to 500 °C. While the photocatalytic activity of NBO for the degradation of various organic compounds has been reported extensively, − there have been few photocatalytic studies using NBH. − Specifically, there are numerous studies reporting phenol degradation with NBO, ,, but none have been reported for NBH.…”

Band Gap Engineering in NaBiO3·2H2O/NaBiO3·xH2O Heterostructures for High Photoelectronic Response

“…For improving the photovoltaic response, an effective approach is constructing a heterojuncture by utilizing narrow band gap materials, which could absorb light over a wide spectral range. − NaBiO 3 has been reported with two forms of hydrated NaBiO 3 ·2H 2 O (hexagonal) and dehydrated NaBiO 3 · x H 2 O (0 < x < 2) (rhombohedral) at a given temperature. NaBiO 3 · x H 2 O is an excellent photocatalyst semiconductor with a band gap of 2.6 eV. − The crystal structure, optical activity, and photo-oxidation activity of NaBiO 3 · n H 2 O were discussed together with the band structure . Pathways and mechanism of visible light-driven photocatalytic degradation of rhodamine B over NaBiO 3 were investigated .…”

“…The investigation of the crystal structure, thermal behavior, and photocatalytic activity of NaBiO 3 · n H 2 O suggested that density of state calculations (DOS) showed hybridization of the Bi 6s and O 2p orbitals at the bottom of the conduction band (CB) for both the hydrated and dehydrated phases, which narrows the band gap and promotes their photocatalytic activity in the visible region . The proportion of NaBiO 3 ·2H 2 O and NaBiO 3 · x H 2 O changes with the temperature variations, indicating that NaBiO 3 ·2H 2 O/NaBiO 3 · x H 2 O heterostructures could be controlled by annealing. Therefore, it is necessary to investigate the photoelectronic property of NaBiO 3 preheated at different temperatures by forming a NaBiO 3 ·2H 2 O/NaBiO 3 · x H 2 O heterostructure.…”