Sunlight driven isotropic β-Bi₂O₃ with high charge-carrier mobility for the efficient degradation of bisphenol A and phenol

Abstract

Nanostructure β-Bi2O3 was synthesized and used for the photocatalytic degradation of bisphenol A and phenol. After 90 minutes of sun light irradiation, the degradation efficiencies of bisphenol A and phenol...

Nanosheets loaded on tetrahedral surfaces form a Z-type Bi2MoO6/γ-Bi2O3 heterojunction to enhance the photocatalytic degradation activity of lomefloxacin and Rhodamine B

“…In Fig. 3(a), the Raman spectra profiles of γ-Bi 2 O 3 and Bi 2 MoO 6 were the same as those found in the literature 17,41,48 which indicated the synthesis of the pure phases of γ-Bi 2 O 3 and Bi 2 MoO 6 . These Raman peaks correspond to the symmetric and asymmetric stretching vibration of the Bi-O bonds and Mo-O bonds, respectively.…”

“…The γ-Bi 2 O 3 was prepared by the water bath heating method and a detailed description is found in papers in the literature. 17,41 The Bi 2 MoO 6 and γ-Bi 2 O 3 powders with mass proportions of 1 : 1, 1 : 2, 1 : 3, 2 : 1, and 3 : 1 were mixed and then ground in a mortar. The mixture was calcined at temperatures of 200, 300, 400, 500 °C for durations of 1, 2, 3, 4, and 5 h. The heterojunctions are showed in Table 1.…”

“…The details of the electrochemical, free radical, and degradation path tests can be found in previous papers found in the literature. 17,41 The ion chromatography was performed using a chromatograph (Metrohm, 882). The water purification was carried out using an ultrapure water system (Millipore, Milli-Q D8), The eluent concentrations of NaHCO 3 and NaCO 3 were both 1.8 mmol L −1 , the flow rate was 1 mL min −1 , and the column temperature was 30 °C.…”

“…16 Although the narrower band gap and the tunnel structure of β-Bi 2 O 3 bring about higher photocatalytic activity than those of the α and γ phases, it is a metastable phase and is easy to transform other Bi 2 O 3 . 17 The metastable γ-Bi 2 O 3 has a higher photocatalytic activity due to a special cage-type structure and various surface defects. 18,19 The photocatalytic degradation efficiency of the Rhodamine B was 95.6% using the γ-Bi 2 O 3 , which was much higher than the 42.3% of α-Bi 2 O 3 .…”

Tuning the heterophase junction in Bi2O3 hybrid crystals with enhanced photocatalytic activity

“…The most substantial peak at approximately 529.9 eV is typical of lattice oxygen for β-Bi 2 O 3 , whereas the other peak at 530.9 eV is associated with the adsorbed oxygen. 37,38 In comparison with pure β-Bi 2 O 3 , B2 exhibits a higher intensity of lattice oxygen and its binding energy slightly diminishes to 529.6 eV. It may imply that the two distinctive structures of Bi 2 O 3 together contribute to forming the new lattice oxygen.…”