Hydrothermal reaction of NaBiO&lt;sub&gt;3&lt;/sub&gt;·&lt;i&gt;n&lt;/i&gt;H&lt;sub&gt;2&lt;/sub&gt;O with transition-metal (Co, Ni, Cu) salts

Yamamoto, Yo; Withanage, Withanage Isuru Udakara; Takei, Takahiro; Yanagida, Sayaka; Kumada, Nobuhiro; Yamane, Hisanori

doi:10.2109/jcersj2.18052

Cited by 4 publications

(2 citation statements)

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“…To the best of our knowledge, there are no reports on the antibacterial properties of Ag + and Cu 2+ ion-exchange KHSi2O5 compounds, although Lou et.al 8) reported visible-region photocatalytic activity for silver silicate (Ag6Si2O7). In this study, we prepared KHSi2O5 by a hydrothermal reaction and incorporated Ag + and Cu 2+ into the interlayer using an ion-exchange method [9][10][11][12] . The Ag + and Cu 2+ ion-exchanged compounds are expected to exhibit antibacterial properties by releasing these ions.…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial and Ion-exchange Properties of Layered KHSi2O5 Compounds Prepared Using Amorphous Silicon Dioxide (a-SiO2) Blocks

Ariyapala

WITHANAGE

Kumada

et al. 2022

J.I.E.

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A layered silicate, KHSi2O5, was synthesized via a hydrothermal method using an amorphous silicon dioxide (SiO2) block, which is industrial waste. This layered silicate was used as a host compound for ionexchange reactions with Ag + and Cu 2+ ions, and the antibacterial properties of the ion-exchanged compounds were investigated. The crystal structures of the compounds were retained during the ionexchange reaction; however, in the case of Cu 2+ , a small amount of Cu(OH)2 coexisted. The M/Si (where M is Ag or Cu) ratios of the ion-exchanged compounds were 0.03 -0.50 and 0.01 -0.32 for M = Ag and Cu, respectively. The antibacterial activity was analyzed by the inhibition zone method using two standard model bacteria: Staphylococcus aureus (S. aureus, gram-positive) and Escherichia coli (E. coli, gramnegative). The Ag-KHSi2O5 and Cu-KHSi2O5 samples showed good antibacterial activity owing to the release of Ag + and Cu 2+ ions from their host silicates. Here, the antibacterial activity of each sample were compared by relative antibacterial activity which was calculated based on the bacterial inhibition zone area.The antibacterial activity of Ag-KHSi2O5 against S. aureus was higher than that against E. coli, whereas the antibacterial activity of Cu-KHSi2O5 against S. aureus was lower than that against E. coli.

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Section: Introductionmentioning

confidence: 99%

Antimicrobial and Ion-exchange Properties of Layered KHSi2O5 Compounds Prepared Using Amorphous Silicon Dioxide (a-SiO2) Blocks

Ariyapala

WITHANAGE

Kumada

et al. 2022

J.I.E.

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“…NaBiO 3 · n H 2 O is an attractive starting material for the hydrothermal synthesis of novel compounds − as well as hybrid composites for photocatalytic activities. − Its accurate crystal structure has not been solved. However, the crystal structure of the dehydrated phase, NaBiO 3 , was determined to be an ilmenite phase. , In 1955, Aurivillius expected a hexagonal unit cell for NaBiO 3 · n H 2 O from X-ray diffraction (XRD) data; however, no details for the crystal structure were reported.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Crystal Structure of a Mixed-Valence Bismuthate, Na₃Bi₃O₈

et al. 2020

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Four types of bismuth oxides, Na3Bi3O8, NaBiO3, α-Bi2O3, and ε-Bi2O3, were obtained by hydrothermal reactions using NaBiO3·nH2O in NaOH solution. The crystal structure of a new phase (Na3 Bi3+)Bi2 5+O8 ((Na0.75Bi0.25)2BiO4) was determined by using single crystal X-ray diffraction data, and this compound was found to show a Na2MnCl4-related structure with a monoclinic system (space group, Pm) with the following lattice parameters: a = 5.990 (2) Å, b = 3.335 (2) Å, c = 10.108 (2) Å, and β = 91.08 (3)°. The final R-factors R 1 and wR 2 were 0.041 and 0.090 (all data), respectively. The new phase was composed of mixed valence states of Bi (Bi3+ and Bi5+, with a mean Bi valence of 4.30) with five distinct Bi sites, where two Bi5+ (Bi1 and Bi2) fully occupied the distorted octahedral sites and three Bi3+ (Bi3, Bi4, and Bi5) were statistically distributed at the split sites with Na+ (Na3, Na4, and Na5). The Na6 site is fully occupied. The distorted Bi5+O6 octahedra formed one-dimensional chains via edge-sharing along the b-axis, with the chains held by Bi3+/Na+ split sites. The structural feature except for the split distribution of Bi3+/Na+ was classified as a Na2MnCl4-type structure. DFT calculations based on a model discounting the split distribution of Bi3+/Na+ indicated that Bi 6s and O 2p orbitals form sp hybridization at the conduction band. This new mixed valence bismuth oxide exhibited photocatalytic activity for phenol degradation under visible light irradiation. In addition to Na3Bi3O8, the hydrothermal reaction using NaBiO3·nH2O in NaOH solution yielded micrometer-sized single crystals of an ilmenite-type NaBiO3 and two polymorphs of bismuth oxides with monoclinic (α-Bi2O3) and orthorhombic (ε-Bi2O3) structures, depending on the reaction temperature and NaOH concentration.

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Hydrothermal magic for the synthesis of new bismuth oxides

Saiduzzaman

Takei

Kumada

2021

Inorg. Chem. Front.

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Hydrothermal reaction of NaBiO<sub>3</sub>·<i>n</i>H<sub>2</sub>O with transition-metal (Co, Ni, Cu) salts

Cited by 4 publications

References 5 publications

Antimicrobial and Ion-exchange Properties of Layered KHSi<sub>2</sub>O<sub>5</sub> Compounds Prepared Using Amorphous Silicon Dioxide (a-SiO<sub>2</sub>) Blocks

Antimicrobial and Ion-exchange Properties of Layered KHSi<sub>2</sub>O<sub>5</sub> Compounds Prepared Using Amorphous Silicon Dioxide (a-SiO<sub>2</sub>) Blocks

Hydrothermal Synthesis and Crystal Structure of a Mixed-Valence Bismuthate, Na₃Bi₃O₈

Hydrothermal magic for the synthesis of new bismuth oxides

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Hydrothermal reaction of NaBiO<sub>3</sub>·<i>n</i>H<sub>2</sub>O with transition-metal (Co, Ni, Cu) salts

Cited by 4 publications

References 5 publications

Antimicrobial and Ion-exchange Properties of Layered KHSi<sub>2</sub>O<sub>5</sub> Compounds Prepared Using Amorphous Silicon Dioxide (a-SiO<sub>2</sub>) Blocks

Antimicrobial and Ion-exchange Properties of Layered KHSi<sub>2</sub>O<sub>5</sub> Compounds Prepared Using Amorphous Silicon Dioxide (a-SiO<sub>2</sub>) Blocks

Hydrothermal Synthesis and Crystal Structure of a Mixed-Valence Bismuthate, Na3Bi3O8

Hydrothermal magic for the synthesis of new bismuth oxides

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Hydrothermal Synthesis and Crystal Structure of a Mixed-Valence Bismuthate, Na₃Bi₃O₈