Synthesis of β-Bi2O3 towards the application of photocatalytic degradation of methyl orange and its instability

Thin Coatings of α‐ and β‐Bi2O3 by Ultrasonic Spray Coating of a Molecular Bismuth Oxido Cluster and their Application for Photocatalytic Water Purification Under Visible Light

“…The XRD pattern of the sample β‐Bi 2 O 3 ‐3 shows the formation of a minor amount of Bi 2 O 2 CO 3 in addition to β‐Bi 2 O 3 after 10 h of visible light irradiation in a RhB solution (Figure ), which is confirmed by Raman spectroscopy (Figure S13). The reaction of β‐Bi 2 O 3 with CO 2 , either formed in situ upon release during the photodegradation of organic compounds or as a result of contact with CO 2(aq) under light irradiation, was discussed in previous studies on β‐Bi 2 O 3 particles . In contrast, XRD studies of the samples α‐Bi 2 O 3 ‐1 and β‐Bi 2 O 3 ‐1 after the degradation experiments do not show any indication of photocorrosion (Figure S14, Figure S15), which is most likely the result of the lower photocatalytic activity (Table S1).…”

“…The reaction of β-Bi 2 O 3 with CO 2 , either formed in situ upon release during the photodegradation of organic compounds or as a result of contact with CO 2(aq) under light irradiation, was discussed in previous studies on β-Bi 2 O 3 particles. [3,[50][51][52][53] In contrast, XRD studies of the samples α-Bi 2 O 3 -1 and β-Bi 2 O 3 -1 after the degradation experiments do not show any indication of photocorrosion ( Figure S14, Figure S15), which is most likely the result of the lower photocatalytic activity (Table S1). Noteworthy, Bi 2 O 2 CO 3 itself is an efficient photocatalyst, [54] which might explain the negligible loss of activity.…”

“…[1] Several bismuth-based chalcogenides (e. g. Bi 2 O 3 , [2,3] Bi 2 S 3 , [4] BiOCl) [5] and heterometallic oxides (e. g. BiWO 6, [6] BiVO 4, [7][8][9][10] Ba(BiO 3 ) 2 , [11] NaBiO 3 ) [12] are suitable as advanced photoredox catalysts targeting visible-light response. [13] Bismuth oxide, which is classified as a non-toxic compound with a high LD 50 value of 5000 mg/kg (rat, oral), [14] is an emerging candidate for the photocatalytic degradation of organic compounds in wastewater such as dye pollutants, biocides or drug residues. The decomposition of the biocide triclosan and the medicinal drug ethinyl estradiol in wastewater is an important research target.…”

Synthesis and Characterization of Bismuth-Cerium Oxides for the Catalytic Oxidation of Diesel Soot

“…The oligomerisation of the hydrated bismuth oxides at low pH values and the incorporation of cerium oxide into the crystal lattice, may both serve as an explanation for the observation of the tetragonal β-Bi 2 O 3 form. Another reason is that the formation of β-Bi 2 O 3 may result from decomposition of bismutite [33]. With increasing Ce content, the F 2g mode in the Raman spectra gets the dominant band.…”

Bi2O2CO3 Growth at Room Temperature: In Situ X-ray Diffraction Monitoring and Thermal Behavior

“…21−23 The majority of these composites were formed after several hours of thermal treatment of Bi 2 O 2 CO 3 in the range between 300 and 400 °C, 21−23 which gives rise to partial or full conversion into β-Bi 2 O 3 . 24 α-Bi 2 O 3 /Bi 2 O 2 CO 3 heterojunctions are less common in comparison, and only recently was their formation observed in the above temperature range, namely at 350 °C. 25 Generally, the reported temperature windows for the transformation sequence Bi 2 O 2 CO 3 → β-Bi 2 O 3 → α-Bi 2 O 3 vary significantly between studies (cf.…”