Synthesis and characterization of porous platelet-shaped α-Bi2O3 with enhanced photocatalytic activity for 17α-ethynylestradiol

Shi, Yingying; Luo, Liang; Zhang, Yefei; Chen, Yu; Wang, Shan; Li, Lingxin; Long, Yanju; Jiang, Fengzhi

doi:10.1007/s10853-017-1553-0

Cited by 28 publications

(14 citation statements)

References 39 publications

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“…After the photocatalytic decomposition of aqueous TCS in the presence of β-Bi 2 O 3 and β-Bi 2 O 3 :Ce samples, the formation of Bi 2 O 2 CO 3 was obtained for doped and undoped β-Bi 2 O 3 samples as a result of photocorrosion (Figure S12). The formation of Bi 2 O 2 CO 3 during photocatalytic degradation of organic pollutants is a known side reaction when bismuth oxide polymorphs such as α-Bi 2 O 3 , , β-Bi 2 O 3 , , and γ-Bi 2 O 3 are used as photocatalysts.…”

Section: Discussionmentioning

confidence: 99%

From a Cerium-Doped Polynuclear Bismuth Oxido Cluster to β-Bi₂O₃:Ce

et al. 2020

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The simultaneous hydrolysis of Bi(NO 3 ) 3 •5H 2 O and Ce(NO 3 ) 3 •6H 2 O results in the formation of novel heterometallic bismuth oxido clusters with the general formula [Bi 38 O 45 (NO 3 ) 24 (DMSO) 28+δ ]:Ce (DMSO = dimethyl sulfoxide; cerium content <1.50%), which is demonstrated by single-crystal X-ray diffraction analysis. The incorporation of cerium into the cluster core is a result of the interplay of hydrolysis and condensation of the metal nitrates in the presence of oxygen. Diffuse-reflectance UV−vis and X-ray photoelectron spectroscopy reveal the presence of Ce IV in the final bismuth oxido clusters as a result of oxidation of the cerium source. The cerium atoms are statistically distributed mainly on the bismuth atom positions of the central [Bi 6 O 9 ] motif of the [Bi 38 O 45 ] cluster core. Hydrolysis and subsequent annealing of the bismuth oxido clusters in the temperature range of 300−400 °C provides β-Bi 2 O 3 :Ce samples with slightly lowered band gaps of approximately 2.3 eV compared to the undoped β-Bi 2 O 3 (approximately 2.4 eV). The sintering behavior of β-Bi 2 O 3 is significantly affected by the cerium dopant. Finally, differences in the efficiency of the asprepared β-Bi 2 O 3 :Ce and undoped β-Bi 2 O 3 samples in the photocatalytic decomposition of the biocide triclosan in an aqueous solution under visible-light irradiation are demonstrated.

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Section: Discussionmentioning

confidence: 99%

From a Cerium-Doped Polynuclear Bismuth Oxido Cluster to β-Bi₂O₃:Ce

et al. 2020

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“…After the photocatalytic decomposition of aqueous RhB, both γ-Bi 2 O 3 samples ( 1 , 1a ) contain Bi 2 O 2 CO 3 , whereas Bi 12 SiO 20 ( 2 ) remained unchanged (Figure S7). The formation of Bi 2 O 2 CO 3 during photocatalysis is a known side reaction when bismuth(III) oxides are used as photocatalyst, and the so-called photocorrosion was discussed recently for α- and β-Bi 2 O 3 . ,− It is assumed that the in situ formed CO 2 during the mineralization of organic pollutants reacts with the bismuth(III) oxide forming Bi 2 O 2 CO 3 . In the studies of Shi et al, photocorrosion of α-Bi 2 O 3 in the decomposition of 17α-ethynylestradiol in aqueous solution was obtained already after one catalytic cycle .…”

Section: Discussionmentioning

confidence: 99%

“…The formation of Bi 2 O 2 CO 3 during photocatalysis is a known side reaction when bismuth(III) oxides are used as photocatalyst, and the so-called photocorrosion was discussed recently for α- and β-Bi 2 O 3 . ,− It is assumed that the in situ formed CO 2 during the mineralization of organic pollutants reacts with the bismuth(III) oxide forming Bi 2 O 2 CO 3 . In the studies of Shi et al, photocorrosion of α-Bi 2 O 3 in the decomposition of 17α-ethynylestradiol in aqueous solution was obtained already after one catalytic cycle . Eberl et al and Schlesinger et al reported on the photocorrosion of β-Bi 2 O 3 to partially give Bi 2 O 2 CO 3 after several catalytic cycles in the photocatalytic decomposition of phenol and rhodamine B, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…The presence of such surfactants accelerates the formation of isomorphous Bi 12 SiO 20 and affects the resulting morphology of the particles, but their effect on the formation of metastable γ-Bi 2 O 3 could not be verified in a recent study. 46 75 Eberl et al 74 and Schlesinger et al 16 reported on the photocorrosion of β-Bi 2 O 3 to partially give Bi 2 O 2 CO 3 after several catalytic cycles in the photocatalytic decomposition of phenol and rhodamine B, respectively. In this work, photocorrosion occurred when γ-Bi 2 O 3 (1, 1a) was used in the decomposition of rhodamine B but not in the presence of Bi 12 SiO 20 (2).…”

Section: Inorganic Chemistrymentioning

confidence: 99%

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γ-Bi₂O₃ – To Be or Not To Be? Comparison of the Sillenite γ-Bi₂O₃ and Isomorphous Sillenite-Type Bi₁₂SiO₂₀

et al. 2018

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The "controlled" synthesis of metastable γ-BiO by solution based approaches was reported several times recently, but the formation of BiSiO in the presence of trace amounts of silicates renders the results to be questionable. Here, the preparation of the Sillenite γ-BiO and the Sillenite-type BiSiO starting from the polynuclear bismuth oxido cluster [BiO(OCCH)(DMSO)] is reported. γ-BiO crystallizes after calcination at 800 °C of the silicate-free hydrolysis product "[BiO(OH)]" on a silver sheet. Corrosion of the substrate causes contamination with silver, which is not incorporated into the Bi-O lattice, and was removed by treatment with an aqueous KCN-solution. BiSiO was obtained after hydrothermal treatment of the bismuth oxido cluster in the presence of NaOH in glass vessels or NaSiO in a Teflon-lined reactor vessel followed by calcination at 600 °C. PXRD studies, scanning electron microscopy, nitrogen adsorption measurements, IR- and Raman spectroscopy, diffuse UV-vis spectroscopy, and DSC were used for characterization. The phase transition of γ-BiO to give α-BiO occurred slowly in the temperature range of 348-510 °C ( Δ H = 6.57 kJ·mol). The silver-containing γ-BiO exhibits slightly increased Raman modes compared to the silver-free sample due to the SERS effect. In the diffuse UV-vis spectrum γ-BiO exhibits an absorption edge at λ = 485 nm ( E = 2.76 eV), and the contamination with silver results in an additional absorption edge at λ = 572 nm. Silver-free γ-BiO exhibits an absorption edge at λ = 460 nm ( E = 2.83 eV) and BiSiO at λ = 422 nm ( E = 3.16 eV). The photocatalytic activity of the compounds was investigated in the decomposition of aqueous rhodamine B under visible light irradiation, showing silver-containing γ-BiO to be slightly more effective compared to BiSiO and significantly more effective than the silver-free γ-BiO.

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“…Nanomaterials derived from TiO 2 have been regarded as promising photocatalysts for hydrogen generation via water splitting and environmental purification since the ground-breaking report by Honda and Fujishima in 1972 [5]. Especially after Carey et al reported the first use of nano-TiO 2 to degrade polychlorobiphenyls under ultraviolet (UV) irradiation in 1976 [6], various metal oxide-based photocatalysts, including TiO 2 [7][8][9][10][11][12], ZnO [13][14][15][16], Bi 2 O 3 [17][18][19], Cu 2 O [20,21], Fe 2 O 3 [22,23], and NiO/Ni(OH) 2 [24,25] have been developed for the photocatalytic degradation of organic dyes and pollutants. However, most of the catalysts were metal-based, which pose a potential risk of secondary pollution to water bodies [26].…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Peng

Zhou

et al. 2020

Nanomaterials

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Carbon dots (C-dots) were facilely fabricated via a hydrothermal method and fully characterized. Our study shows that the as-synthesized C-dots are nontoxic, negatively charged spherical particles (average diameter 4.7 nm) with excellent water dispersion ability. Furthermore, the C-dots have a rich presence of surface functionalities such as hydroxyls and carboxyls as well as amines. The significance of the C-dots as highly efficient photocatalysts for rhodamine B (RhB) and methylene blue (MB) degradation was explored. The C-dots demonstrate excellent photocatalytic activity, achieving 100% of RhB and MB degradation within 170 min. The degradation rate constants for RhB and MB were 1.8 × 10−2 and 2.4 × 10−2 min−1, respectively. The photocatalytic degradation performances of the C-dots are comparable to those metal-based photocatalysts and generally better than previously reported C-dots photocatalysts. Collectively considering the excellent photocatalytic activity toward organic dye degradation, as well as the fact that they are facilely synthesized with no need of further doping, compositing, and tedious purification and separation, the C-dots fabricated in this work are demonstrated to be a promising alternative for pollutant degradation and environment protection.

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Synthesis and characterization of porous platelet-shaped α-Bi2O3 with enhanced photocatalytic activity for 17α-ethynylestradiol

Cited by 28 publications

References 39 publications

From a Cerium-Doped Polynuclear Bismuth Oxido Cluster to β-Bi₂O₃:Ce

From a Cerium-Doped Polynuclear Bismuth Oxido Cluster to β-Bi₂O₃:Ce

γ-Bi₂O₃ – To Be or Not To Be? Comparison of the Sillenite γ-Bi₂O₃ and Isomorphous Sillenite-Type Bi₁₂SiO₂₀

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

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Synthesis and characterization of porous platelet-shaped α-Bi2O3 with enhanced photocatalytic activity for 17α-ethynylestradiol

Cited by 28 publications

References 39 publications

From a Cerium-Doped Polynuclear Bismuth Oxido Cluster to β-Bi2O3:Ce

From a Cerium-Doped Polynuclear Bismuth Oxido Cluster to β-Bi2O3:Ce

γ-Bi2O3 – To Be or Not To Be? Comparison of the Sillenite γ-Bi2O3 and Isomorphous Sillenite-Type Bi12SiO20

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

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From a Cerium-Doped Polynuclear Bismuth Oxido Cluster to β-Bi₂O₃:Ce

From a Cerium-Doped Polynuclear Bismuth Oxido Cluster to β-Bi₂O₃:Ce

γ-Bi₂O₃ – To Be or Not To Be? Comparison of the Sillenite γ-Bi₂O₃ and Isomorphous Sillenite-Type Bi₁₂SiO₂₀