Thermochemical data for n-alkylmonoamines functionalization into lamellar silicate Al-kanemite

Guerra, Denis L.; Airoldi, Cláudio

doi:10.1016/j.jct.2010.08.008

Cited by 7 publications

(1 citation statement)

References 30 publications

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“…The chemistry of intercalation is a research area that has been widely investigated and plays a very important part in applications in many academic and technological fields, such as those related to ion-exchange reactions and supports for catalytic methods [8,9]. The insertion process of organic neutral polar molecules into the nanospace void of sheets of layered insoluble nanocompounds leads to well-organized inorganic/organic structural layer materials with high crystallinity and porosity [11][12][13][14][15]. Important advances in the organofunctionalization processes field have been obtained by observing if any property of the lamellar nanocompound charges, by comparing these with those related to the host, as well as to the inserted guest molecules at the end of the process [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Equilibrium, thermodynamic, and kinetic of Cr(VI) adsorption using a modified and unmodified bentonite clay

Guerra

Mello

Freitas

et al. 2014

International Journal of Mining Science and Technology

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a b s t r a c tThe capacities of natural and modified Brazilian bentonite samples as adsorbents to remove hexavalent metal chromium were investigated under several conditions in batch and column methods. The raw material, Ca-bentonite, was modified by anchorament of 3-aminopropyltrietoxisilane (APS) and 3,2-aminoethylaminopropyltrimetoxisilane (AEAPS) in the surface of bentonite sample. This type of new occurrence of bentonite is suitable as a raw material for adsorption process. Adsorption behavior of three bentonite types was strongly depending on pH of adsorbate solution, contact time adsorbent/adsorbate, and initial concentration of Cr(VI). The results were confirmed by column method and reveals that the adsorption process of materials accorded by the Redlich-Peterson, Sips, Dubinin-Radushkevich, and Langmuir isotherm models. The exothermic enthalpic values reflected a favorable energetic process for chromium ions anchored in the material surfaces. The negative Gibbs free energy results supported the spontaneity of three adsorption reactions with Cr(VI) ions.

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