Layered zinc hydroxide salts: Delamination, preferred orientation of hydroxide lamellae, and formation of ZnO nanodiscs

Demel, Jan; Pleštil, Josef; Bezdička, Petr; Janda, Pavel; Klementová, Mariana; Lang, Kamil

doi:10.1016/j.jcis.2011.04.024

Cited by 37 publications

(49 citation statements)

References 52 publications

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“…The lines of the additional phase can be distinguished well from the lines of Cu 2 (OH) 3 (CH 3 COO)·H 2 O because of their broad profiles corresponding to the lower crystallinity of the phase. Positions of the additional diffraction lines could indicate some species intercalated between the Cu 2 (OH) 3 (CH 3 COO)·H 2 O layers, similarly as reported by Demel et al [18]. However, the elemental and the thermal analysis coupled with the mass spectroscopy as well as FTIR spectroscopy provided similar results for both the phase pure Cu 2 (OH) 3 (CH 3 COO)·H 2 O and the mixed-phase product.…”

Section: Resultssupporting

confidence: 78%

Synthesis and characterization of single crystals of the layered copper hydroxide acetate Cu₂(OH)₃(CH₃COO)·H₂O

Švarcová

Klementová

Bezdička

et al. 2011

Cryst. Res. Technol.

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Single-crystals of the layered copper hydroxide acetate Cu 2 (OH) 3 (CH 3 COO)·H 2 O were synthesized by heating copper acetate solution at 60 °C. The standard synthesis of the title compound based on slow titration of copper acetate solution with NaOH yielded materials with worse morphology and an additional phase present. The obtained products were characterized with powder X-ray diffraction, high temperature powder X-ray diffraction, scanning electron microscopy and infrared spectroscopy. The crystal structure was determined from single-crystal X-ray diffraction data, collected both at 120 K and at 293 K. The title compound crystallizes in the monoclinic botallackite-type layered structure, space group P2 1 , with the lattice parameters a = 5.5776(3) Å, b = 6.0733(2) Å, c = 18.5134(8) Å, β = 91.802(4)° and a = 5.5875(4) Å, b = 6.0987(4) Å, c = 18.6801(10) Å, β = 91.934(5)° for 120 K and for 293 K, respectively. Acetate groups and water molecules are interlayered between corrugated sheets of edge-sharing CuO6 octahedra exhibiting strong distortion resulted from the Jahn-Teller effect.

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Section: Resultssupporting

confidence: 78%

Synthesis and characterization of single crystals of the layered copper hydroxide acetate Cu₂(OH)₃(CH₃COO)·H₂O

Švarcová

Klementová

Bezdička

et al. 2011

Cryst. Res. Technol.

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“…This additional phase was generated from tighter packing of dodecyl sulfate ions in the interlayer space. 7 On the other hand, the pattern of ZHN-250-DS appears as clearly as the mono-phase of intercalated DS ion. The difference between the two patterns can be indirect evidence that the charge density of ZHN, prepared by radiolysis, is different from that of the conventionally prepared ZHN.…”

Section: 15mentioning

confidence: 98%

“…The XRD patterns of two samples show a series of h00 reflections, indicating extensive order along the layer stacking direction. 7,20,21 The basal spacings of ZHN-250-DS (a) and ZHN-chem-DS (b), calculated from the first h00 reflection at around 2.8º in two-theta, are approximately 31.2 Å and 31.0 Å, respectively. From these results, we could primarily confirm that the nitrate ions were exchanged by dodecyl sulfate ions.…”

Section: 15mentioning

confidence: 99%

“…Another strong band at 1224 cm −1 is assigned to the S=O stretching vibrations of DS. 7,20 In the spectrum of ZHN-chem-DS (b), the O-H vibration peaks, which are located in the 3600-3400 cm −1 region, changed broadly, accompanying the disappearance of sharp peaks in the lattice hydroxyl group. This might be due to the occurrence of deformation or collapse of lattice during the anion exchange reaction.…”

Section: 15mentioning

confidence: 99%

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Electron Beam Mediated Simple Synthetic Route to Preparing Layered Zinc Hydroxide

Bae¹,

Jung²

2012

Bulletin of the Korean Chemical Society

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We have developed a novel and eco-friendly synthetic route for the preparation of a two-dimensional layered zinc hydroxide with intercalated nitrate anions. The layered zinc hydroxide nitrate, called 'zinc basic salt', was, in general, successfully synthesized, using an electron beam irradiation technique. The 2-propanol solutions containing hydrated zinc nitrate were directly irradiated with an electron-beam at room temperature, under atmospheric conditions, without stabilizers or base molecules. Under electron beam irradiation, the reactive OH· radicals were generated by radiolysis of water molecules in precursor metal salts. After further radiolytic processes, the hydroxyl anions might be formed by the reaction of solvated electrons and the OH· radical. Finally, the Zn 5 (OH) 8 (NO 3 ) 2 ·2H 2 O was precipitated by the reaction of zinc cation and hydroxyl anions. Structure and morphology of obtained compounds were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and high resolution transmission electron microscopy (HR-TEM). The chemical components of the products were determined by Fourier transform infrared spectroscopy (FT-IR) and elemental analysis (EA). The thermal behavior of products was studied by thermogravimetric (TG) and differential thermal analysis (DTA).

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“…In this chapter, the most comment LDH synthesis methods, and the application of LDH and its derivatives such as MMO for photocatalysis have been reviewed. As the exfoliation technique of LDH nanosheets has been more and more mature, 9,19,208 together with the unusual structural features, that is, ultimate two-dimensional anisotropy and the novel physical and chemical properties due to an extremely small thickness of around 1 nm, it is anticipated that ultrathin and even transparent LDH single nanosheet will find its way in photocatalysis. Furthermore, these nanosheets are useful as a building block for the fabrication of a wide variety of functional nanostructured materials, such as the layer-by-layer assembly of nanosheets with appropriately charged counterparts through a wet process has advancing application in the near future.…”

Section: Summary and Future Perspectivesmentioning

confidence: 99%

Photocatalysts with adsorption property for dye-contaminated water purification

Chen¹

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Dye-polluted water discharged from textile, dyeing, carpet manufacturing, pulp, and paper industries must be properly treated before it is discharged to the environment because the dyes are hazardous to human beings, also can cause problems to the ecosystem.Adsorption and photocatalytic degradation of dyes are promising methods for the treatment of dye-polluted wastewater. Zinc (Zn) aluminium (Al) layered double hydroxide (ZnAl-LDH) materials, and layered double oxides (LDOs) that have semiconductor properties and anionic exchange properties can be used for the removal of anionic dyes. Correspondingly, graphitic carbon nitride (g-C3N4) is a fascinating metal-free semiconductor with synergistic adsorption property due to its polymeric π-conjugated structure, which is a promising photocatalyst in environmental remediation. Therefore, this thesis focuses on developing novel photocatalysts, which is activated under UV (ultraviolet) and/or visible light irradiation with adsorption property for dyes removal from wastewater. The studies include exploring the optimal experimental conditions for the synthesis of LDOs with the best performance in adsorption and photocatalytic degradation, modifying g-C3N4 with carbon black for tuning its adsorption selectivity and improving the photocatalytic activity, and constructing novel inorganic-organic heterogeneous semiconductor composites (ZnAl-LDH@C3N4) with desired adsorption and photodegradation performance toward both cationic and anionic dyes. The relationship between structures, physicochemical properties of photocatalysts and dye removal performances has also been well studied in the thesis.The first part of the experimental chapters focuses on the zinc aluminium layered double hydroxide based photocatalysts. ZnAl-layered double oxide composites (LDOs) were developed to remove anionic dye Orange II sodium salt (OrgII). Synthetic parameters including the molar ratio of Zn to Al, and calcination temperature were adjusted to study the optimal synthetic condition. The relationship between the structural features and the adsorption properties and photocatalytic activity of LDOs was thoroughly investigated.The second part of the experimental chapter focuses on the modification of g-C3N4. Series of carbon black (CB) modified g-C3N4 samples with efficient adsorption and photocatalytic activity were prepared by heating the mixtures of CB and urea. The adsorption and photocatalytic activities were evaluated by removing both cationic dye methylene blue (MB) and anionic dye OrgII. CB modified g-C3N4 exhibited higher photocatalytic activities than pristine g-C3N4. CB worked as both dopant and reactional site during the polycondensation III of urea, which was supposed to increase the crystallisation and condensation degree of g-C3N4. The existing of CB in the g-C3N4 matrix not only enhanced the light absorption for g-C3N4 but also quenched the recombination of charge carriers. Therefore, modified g-C3N4 samples exhibited improved performance for dyes' removal.The third part o...

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Layered zinc hydroxide salts: Delamination, preferred orientation of hydroxide lamellae, and formation of ZnO nanodiscs

Cited by 37 publications

References 52 publications

Synthesis and characterization of single crystals of the layered copper hydroxide acetate Cu₂(OH)₃(CH₃COO)·H₂O

Synthesis and characterization of single crystals of the layered copper hydroxide acetate Cu₂(OH)₃(CH₃COO)·H₂O

Electron Beam Mediated Simple Synthetic Route to Preparing Layered Zinc Hydroxide

Photocatalysts with adsorption property for dye-contaminated water purification

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Layered zinc hydroxide salts: Delamination, preferred orientation of hydroxide lamellae, and formation of ZnO nanodiscs

Cited by 37 publications

References 52 publications

Synthesis and characterization of single crystals of the layered copper hydroxide acetate Cu2(OH)3(CH3COO)·H2O

Synthesis and characterization of single crystals of the layered copper hydroxide acetate Cu2(OH)3(CH3COO)·H2O

Electron Beam Mediated Simple Synthetic Route to Preparing Layered Zinc Hydroxide

Photocatalysts with adsorption property for dye-contaminated water purification

Contact Info

Product

Resources

About

Synthesis and characterization of single crystals of the layered copper hydroxide acetate Cu₂(OH)₃(CH₃COO)·H₂O

Synthesis and characterization of single crystals of the layered copper hydroxide acetate Cu₂(OH)₃(CH₃COO)·H₂O