Lanthanide-based luminescent hybrid materials.

Activated carbons and low cost adsorbents for remediation of tri- and hexavalent chromium from water.

A joint experimental and computational systematic exploration of the driving forces that govern (i) encapsulation of active ingredients (solvent, starting material dehydration, drug/material ratio, immersion time, and several consecutive impregnations) and (i) its kinetics of delivery (structure, polarity, ...) was performed using a series of porous biocompatible metal–organic frameworks (MOFs) that bear different topologies, connectivities, and chemical compositions. The liporeductor cosmetic caffeine was selected as the active molecule. Its encapsulation is a challenge for the cosmetic industry due to its high tendency to crystallize leading to poor loadings (<5 wt %) and uncontrolled releases with a subsequent low efficiency. It was evidenced that caffeine entrapping reaches exceptional payloads up to 50 wt %, while progressive release of this cosmetic agent upon immersion in the simulated physiological media (phosphate buffer solution pH = 7.4 or distilled water pH = 6.3, 37 °C) occurred mainly depend...

Rationale of Drug Encapsulation and Release from Biocompatible Porous Metal−Organic Frameworks

Oil removal from aqueous state by natural fibrous sorbent: An overview

Chapter 225 – Rare-earth beta-diketonates

An overview about the homogeneous and heterogeneous methods of synthesizing silylating agents and applications of the organofunctionalized silica-gel samples was explored. The pendant molecules attached covalently to the inorganic surface displayed important properties to act as sequestrating agents for metals in aqueous and non-aqueous solutions. The large variety of basic centres anchored on organic molecules improve the capacity in adsorbing cations. The increase in adsorption is dependent on the number of basic atoms disposed on the pendant molecules on the surface. The combination of acidic and basicity properties favours the selectivity, such is exemplified by the thiol modified silicas towards mercury (II) cations.

/pdf/o-uso-de-silica-gel-organofuncionalizada-como-agente-34gmslean5.pdf

O uso de sílica gel organofuncionalizada como agente sequestrante para metais

This publication reports the adsorption of crude oil on vermiculite samples, expanded and hydrophobized with carnauba (Copernicia Cerifera) wax. The adsorption studies were performed by using columns filled with the vermiculite matrices and by dispersion of the vermiculite samples in an oil-water (50 ppm of oil) emulsion. The hydrate vermiculite exhibits a very low adsorption capacity against crude oil. On the other hand, anhydrous (expanded) and hydrophobized matrices show a high adsorption capacity. The 10% hydrophobized matrix show a 50% increased adsorption capacity, in comparison with the expanded one. For adsorption performed in the water-oil emulsion, saturation of the solid hydrophobized matrix is achieved after 60 min. The hydrophobized samples exhibit adsorption factors in the 0.7-1.0 range.

/pdf/adsorption-of-crude-oil-on-anhydrous-and-hydrophobized-nk8kdeuntl.pdf

Adsorption of crude oil on anhydrous and hydrophobized vermiculite

Synthesis of new compounds involving layered titanates and niobates with copper(II)

The intercalation of n-alkyldiamines into crystalline layered titanate

http://leandro.iqm.unicamp.br/leandro/shtml/publications/2003_j_phys_chem_solids.pdf

Robson F. de Farias

Papers

O uso de sílica gel organofuncionalizada como agente sequestrante para metais

Adsorption of crude oil on anhydrous and hydrophobized vermiculite

Synthesis of new compounds involving layered titanates and niobates with copper(II)

The intercalation of n-alkyldiamines into crystalline layered titanate

Synthesis, characterization and catalytic properties of sol-gel derived mixed oxides