Inorganic modification of layered silicates toward functional inorganic-inorganic hybrids

Sirinakorn, Thipwipa; Imwiset, Kamonnart Jaa; Bureekaew, Sareeya; Ogawa, Makoto

doi:10.1016/j.clay.2017.12.011

Cited by 42 publications

(29 citation statements)

References 136 publications

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“…HLSs can be used as parent materials to synthesize mesoporous and microporous framework materials by either expanding the structures using appropriate methods or by condensing the silicate layers topotactically (Marler and Gies 2012). Sirinakorn et al (Sirinakorn et al 2018) and Roth et al (Roth et al 2016) published review articles on research papers dealing with modifications of layered silicates such as kanemite, makatite, octosilicate and magadiite by ion exchange with organic and inorganic cations, pillaring, silylation of the OH groups and grafting, or introducing of metal nanoparticles. In addition, HLSs can be used as a starting material for zeolite synthesis by classical hydrothermal treatment for the synthesis of, e.g., ZSM-5 and ferrierite (Y.…”

Section: Synthesis and Use Of Magadiitementioning

confidence: 99%

The crystal structure of mineral magadiite, Na2Si14O28(OH)2∙8H2O

Marler

Krysiak

Grosskreuz

et al. 2022

American Mineralogist

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Magadiite from Lake Magadi was structurally analyzed based on X-ray powder diffraction data. The idealized chemical composition of magadiite is Na16[Si112O224(OH)16]∙64H2O per unit cell. The XRD powder diffraction pattern was indexed in orthorhombic symmetry with lattice parameters a0 = 10.5035(9) Å, b0 = 10.0262(9) Å, and c0 = 61.9608(46) Å. The crystal structure was solved from a synthetic magadiite sample in a complex process using 3D electron diffraction combined with model building as presented in an additional paper. A Rietveld refinement of this structure model performed on a magadiite mineral sample in space group F2dd (No. 43) converged to residual values of RBragg = 0.031 and RF = 0.026 confirming the structure model. Physico-chemical characterization using solid-state NMR spectroscopy, SEM, TG-DTA, and DRIFT spectroscopy further confirmed the structure. The structure of magadiite contains two enantiomorphic silicate layers of, so far, unknown topology. The dense layers exhibit no porosity or micro-channels and have a thickness of 11.5 Å (disregarding the van der Waals radii of the terminal O atoms) and possess a silicon Q4 to Q3 ratio of 2.5. 16 out of 32 terminal silanol groups are protonated, and the remaining groups compensate for the charge of the hydrated sodium cations. Bands of edge-sharing [Na(H2O)6/1.5] octahedra are intercalated between the silicate layers extending along (110) and (110). The water molecules are hydrogen bonded to terminal silanol groups with O···O distances of 2.54–2.91 Å. The structure of magadiite is slightly disordered, typical for hydrous layer silicates (HLS), which possess only weak interactions between neighboring layers. In this respect, the result of the structure refinement represents a somewhat idealized structure. Nevertheless, the natural magadiite possesses a higher degree of structural order than any synthetic magadiite sample. The structure analysis also revealed the presence of strong intra-layer hydrogen bonds between the terminal O atoms (silanol/siloxy groups), confirmed by 1H MAS NMR and DRIFT spectroscopy. The surface zone of the silicate layers, as well as the interlayer region containing the [Na(H2O)6/1.5] octahedra, are closely related to the structure of Na-RUB-18.

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Section: Synthesis and Use Of Magadiitementioning

confidence: 99%

The crystal structure of mineral magadiite, Na2Si14O28(OH)2∙8H2O

Marler

Krysiak

Grosskreuz

et al. 2022

American Mineralogist

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“…However, the mechanical properties (resistance to temperature and environmental stability) of the latter limits their application fields [4]. The applications of hybrid inorganic materials range from ion exchangers, semiconductors, adsorbent, electrochemical sensor catalysts, and catalyst support [5,6]. The toxicity and low biocompatibility of organic-inorganic hybrids also limit their application in biomedical science and drugs production.…”

Section: Introductionmentioning

confidence: 99%

Preparation of the Hybrids of Hydrotalcites and Chitosan by Urea Method and Their Antimicrobial Activities

et al. 2019

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Hybrid nano-supra molecular structured materials can boost the functionality of nano- or supra-molecular materials by providing increased reactivity and conductivity, or by simply improving their mechanical stability. Herein, the studies in materials science exploring hybrid systems are investigated from the perspective of two important related applications: healthcare and food safety. Interfacing phase strategy was applied, and ZnAl layered double hydroxide-chitosan hybrids, prepared by the urea method (U-LDH/CS), were successfully synthesized under the conditions of different chitosan(CS) concentrations with a Zn/Al molar ratio of 5.0. The structure and surface properties of the U-LDH/CS hybrids were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectrometer(FTIR), scanning electronmicroscopy (SEM), ultravioletvisible (UV-Vis), and zero point charge (ZPC) techniques, where the effect of CS concentration on the structure and surface properties was investigated. The use of the U-LDH/CS hybrids as antimicrobial agents against Escherichia coli, Staphylococcus aureus, and Penicillium cyclopium was investigated in order to clarify the relationship between microstructure and antimicrobial ability. The hybrid prepared in a CS concentration of 1.0 g∙L−1 (U-LDH/CS1) exhibited the best antimicrobial activity and exhibited average inhibition zones of 24.2, 30.4, and 22.3mm against Escherichia coli, Staphylococcus aureus, and Penicillium cyclopium, respectively. The results showed that the appropriate addition of CS molecules could increase antimicrobial ability against microorganisms.

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“…The size of the particle and the connection of the metal particles with the titanate particle are of interest for the optimization of the catalyst performance. In addition, the reaction of metal ion with layered silicates has been utilized to construct various kinds of functional hybrids . In the present system, In(OH) 3 particles formed on the titanate are within the sub‐micrometer size range and the size varies slightly, depending on the concentration of the initial indium(III) chloride solution.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Indium(III) Collection from Water by a Reaction with a Layered Titanate (Na₂Ti₃O₇)

2018

Self Cite

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The reaction of an aqueous solution of indium(III) chloride with a sodium titanate (Na 2 Ti 3 O 7 ) is investigated. The remaining amount of the indium(III) in the aqueous solution after the reaction with Na 2 Ti 3 O 7 has been examined to show the efficient collection of indium(III) from the aqueous solution. The maximum collected indium(III) amount for Na 2 Ti 3 O 7 is IntroductionDue to the developments of advanced optical, electronic, and magnetic devices, the use of various kinds of metals has become more important. Accordingly, the collection of metals from aqueous environments is an important issue, as a supply of metals. The practical uses of metals always accompany the release of metals to the environment, so that the collection of metals from the environment is a technology for environmental remediation. The removal of toxic metals, such as heavy metals and radioactive metals, for water purification and the collection of noble metals from environments have been examined extensively.The adsorption of target metals onto solids (adsorbents) is a way for their collection and for water purification. The collection of metal ions and metal-oxo anions onto various adsorbents by ion-exchange reactions have been examined to find suitable ion exchangers for specific target species to be collected. Inorganic ion exchangers are characterized by high cationexchange capacity and chemical stability for long-term use. [1] One can use nontoxic and environmentally benign inorganic ion exchangers, such as silicates, including clay minerals [2][3][4] and zeolites, [5,6] metal phosphates, [7] titanates, [8] and layered double hydroxides. [2,9,10] A wide variety of ion-exchangeable inorganic solids are available, although the mechanisms of the ion exchange are not fully elucidated. The reaction may include simple ion exchange, coordination, surface precipitation of polymeric species, and the dissolution of the ion exchangers and subsequent reconstruction.[a]

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Inorganic modification of layered silicates toward functional inorganic-inorganic hybrids

Cited by 42 publications

References 136 publications

The crystal structure of mineral magadiite, Na2Si14O28(OH)2∙8H2O

The crystal structure of mineral magadiite, Na2Si14O28(OH)2∙8H2O

Preparation of the Hybrids of Hydrotalcites and Chitosan by Urea Method and Their Antimicrobial Activities

Highly Efficient Indium(III) Collection from Water by a Reaction with a Layered Titanate (Na₂Ti₃O₇)

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Inorganic modification of layered silicates toward functional inorganic-inorganic hybrids

Cited by 42 publications

References 136 publications

The crystal structure of mineral magadiite, Na2Si14O28(OH)2∙8H2O

The crystal structure of mineral magadiite, Na2Si14O28(OH)2∙8H2O

Preparation of the Hybrids of Hydrotalcites and Chitosan by Urea Method and Their Antimicrobial Activities

Highly Efficient Indium(III) Collection from Water by a Reaction with a Layered Titanate (Na2Ti3O7)

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Highly Efficient Indium(III) Collection from Water by a Reaction with a Layered Titanate (Na₂Ti₃O₇)