Journal ArticleDOI
Structure of organoclays—an X-ray diffraction and thermogravimetric analysis study
Yunfei Xi,Zhe Ding,Hongping He,Ray L. Frost +3 more
- Vol. 277, Iss: 1, pp 116-120
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TLDR
High-resolution thermogravimetric analysis (HRTG) shows that the thermal decomposition of SWy-2-MMTs modified with the surfactant octadecyltrimethylammonium bromide takes place in four steps.Abstract:
X-ray diffraction has been used to study the changes in the surface properties of a montmorillonitic clay through the changes in the basal spacings of montmorillonite (SWy-2) and surfactant-intercalated organo-clays.
Variation in the d-spacing was found to be a step-function of the surfactant concentration. High resolution thermogravimetric analysis (HRTG) was used to study the thermal decomposition surfactant modified SWy-2-MMTs modified with the surfactant octadecyltrimethylammonium bromide. High resolution thermogravimetry shows the decomposition takes place in 4 steps. A mass loss step is observed at room temperature and is attributed to dehydration of adsorption water. A second mass loss step is observed over the 87.9 to 135.5 degrees Celsius temperature range and is also attributed to dehydration of water hydrating metal cations such as Na+ . The third mass loss occurs from 178.9 to 384.5 degrees Celsius and is assigned to a loss of surfactant. The fourth mass loss step is ascribed to the loss of OH units through dehydroxylation over the 556.01 to 636.35 degrees Celsius temperature range.read more
Citations
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Journal ArticleDOI
Organoclays: Properties, preparation and applications
TL;DR: In this article, the authors give an overview of properties, synthesis and applications of bentonite and polymer nanocomposites and describe the research performed until the present moment, including different synthesis techniques, modifications with several chemical compounds as quaternary alkylammonium salts and also biomolecules as enzymes that provide applicability in a variety of fields.
Journal ArticleDOI
Modification of the surfaces of Wyoming montmorillonite by the cationic surfactants alkyl trimethyl, dialkyl dimethyl, and trialkyl methyl ammonium bromides.
TL;DR: A range of surfactant molecular environments within the surface-modified montmorillonite are proposed based upon their thermal decomposition.
Journal ArticleDOI
Functional properties of wheat gluten/montmorillonite nanocomposite films processed by casting
TL;DR: In this article, a wheat gluten/montmorillonite (WG/MMT) nanocomposite films were prepared by casting and transmission electron microscopy observations showed that MMT nanoparticles were homogeneously distributed within the matrix but not completely exfoliated.
Journal ArticleDOI
Adsorption of hydrocarbons on organo-clays - implications for oil spill remediation
TL;DR: The use of organo-clays for cleaning up oil spills is feasible due to its many desirable properties such as high hydrocarbon sorption and retention capacities, hydrophobicity, and recyclability.
Journal ArticleDOI
Preparation, characterization of surfactants modified clay minerals and nitrate adsorption
TL;DR: In this article, an organic surfactants modified clay minerals are used as adsorbents for hydrophobic organic contaminants remediation; this work however has shown organoclays can also work as anionic contaminant immobilization, which is significant for providing mechanism for the adsorption of anionic contaminants from waste water.
References
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Journal ArticleDOI
Clay-organic complexes as adsorbents for phenol and chlorophenols.
TL;DR: Several clay-organic complexes were synthesized by placing quaternary ammonium cations on smectite by cation exchange and they were then examined for their ability to adsorb phenol and several of its chlorinated congeners as discussed by the authors.
Journal ArticleDOI
Hydrophobicity of siloxane surfaces in smectites as revealed by aromatic hydrocarbon adsorption from water
William F. Jaynes,Stephen Boyd +1 more
TL;DR: In this article, the authors measured the adsorption of aromatic hydrocarbons from water by organo-clays and found that the planar surfaces of the compounds adsorb directly to the clay surface.
Journal ArticleDOI
Pentachlorophenol sorption by organo-clays
TL;DR: Several clay organic complexes were prepared by placing organic cations on the exchange sites of smectite clays and studied as sorbents for pentachlorophenol (PCP) as discussed by the authors.
Journal ArticleDOI
Sorption of tannic acid, phenol, and 2,4,5-trichlorophenol on organoclays
TL;DR: In this article, the effect of pH on sorption of phenol, trichlorophenol, and tannic acid on montmorillonite-based sorbents was investigated.
Journal ArticleDOI
Trimethylphenylammonium-smectite as an effective adsorbent of water soluble aromatic hydrocarbons.
William F. Jaynes,Stephen Boyd +1 more
TL;DR: Results suggest the utility of TMPA-smectite as a liner material for petroleum storage containers and waste disposal reservoirs with the ability to impede the flow of water and to effectively adsorb dissolved organic contaminants.