Stability of Calcium Deficient Hydroxyapatite/Clay Mineral Nanocomposite in Solutions with Different pH

Pazourková, Lenka; Hundáková, Marianna; Peikertová, Pavlína; Thomasová, Barbora; Seidlerová, Jana; Martynková, Gražyna Simha

doi:10.1166/jnn.2019.15864

Cited by 2 publications

(1 citation statement)

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“…Usually, these materials are grouped based on the type of host (i.e., the layered mineral) and guest molecule involved in the interaction. Three main types of functionalized layer silicates can be identified, namely, (i) organoclays, which are layered silicates (typically smectites) bound to an organic molecule (or to an organo-metallic complex) that imparts peculiar properties to the modified minerals; − (ii) pillared clays, which are layered silicates intercalated with small organic or inorganic complexes (i.e., “pillars”), partially filling the interlayer space; − and (iii) clay mineral-nanocomposites, which are fine-particulate materials, heterogeneous at the nanoscale level, made at least from one clay mineral and from other materials such as polymers, pharmaceuticals, inorganic molecules, or carbon. − …”

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confidence: 99%

Gaseous Heptanethiol Removal by a Fe³⁺-Phenanthroline–Kaolinite Hybrid Material

et al. 2021

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Kaolinite functionalized by the μ-oxo Fe3+-phenanthroline complex (Fe+3Phen) was selected to test its ability to efficiently remove and store gaseous heptanethiol (HPT). Spectroscopic techniques, elemental analysis, and thermal analysis coupled with evolved gas mass spectrometry were employed to characterize the material before and after the exposure to the gas and to define the adsorption process. The amount of HPT trapped by the functionalized kaolinite after 60 days is 0.10940 moles per 100 g of kaolinite which, considering the amount of adsorbed Fe+3Phen (0.00114 moles per 100 g of kaolinite), means a thiol/Fe3+Phen molar ratio of about 100:1, a value much higher than those found in the past for Fe+3Phen functionalized montmorillonite and sepiolite. In addition, the process was found to be efficient also beyond 60 days. This significant removal of the smelly gas was explained by considering a continuous catalytic activity of Fe3+ toward the oxidation of thiol to disulfide.

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