Layered double hydroxides, containing Mg or Zn as divalent cations in the brucite - like layer and the derived mixed oxides obtained after the calcination process of the clays have been used to remove the anionic surfactant, sodium dodecylbenzenesulfonate, from aqueous solutions. The property of the layered clay to reconstruct its structure by using its structural “memory effect” has been used as a controlled variable parameter during the adsorption/

The coating of titanium and its alloys with hydroxyapatite (HA) by various methods was presented.

Gentamicin–hydrotalcite-like anionic clays nanocomposites were synthesized by using the direct co-precipitation method. XRD, XPS and FTIR analysis reveal that for the hydrotalcite-like sample, the drug is adsorbed only on the anionic clay surface, whereas for copper, partially substituted hydrotalcite gentamicin is detected also in the clay interlayer. The affinity of gentamicin to form complexes with some transition metals such as iron and copper

Chemical sensors utilizing immobilized enzymes and proteins are important for monitoring chemical processes and biological systems. Glucose oxidase (GOx) from Aspergillum Niger is a flavoenzyme that has been used to determine glucose. Among the conventional methods of enzyme deposition the main strategy consists in its entrapment in an inert matrix adsorbed on the electrode surface. We report here the synthesis and physical - chemical characterization

Copper and cerium partially substituted anionic clay was synthesized by the coprecipitation method. The XRD analysis and N-2 adsorption at 77 K indicated that calcination destroys the layered matrix of the clay, giving rise to mixed oxides having a high surface area and mesoporous characteristics; SEM analysis showed that the new formed mixed oxides consist of ensembles of highly agglomerated, interconnected nanoparticles. It results from XPS that

This work describes the preparation of a hydroxyapatite/polyurethane composite membrane and their characteristics. The porous hydroxyapatite/polyurethane composite membranes were made via solvent casting process. The deposited hydroxyapatite layers were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The data suggest that the method utilized in this work can be applied to obtain deposition of coating of crystalline

The membrane processes play a significant role in the water and wastewater treatment to remove dissolved solids, especially electrolytes. In this study, the asymmetric mixed matrix membranes based on polyurethane and SAPO-5 zeolite were used on electrolyte (NaCl) removal from water. Using a low operating pressure, the membrane performances (i.e., pure water permeation, flux and salt rejection) were measured. All membranes were showing an increase

Oleate/LDH composites have been obtain by calcination-reconstruction procedures by the successive uses of the anionic clay memory effect. XRD and FTIR analysis were used to study the structural characteristics of the hybrid samples. The amount of oleate in the hybrid formulation of the clay matrix is highest after the second calcination-reconstruction cycle. After the fourth cycle the clay structure is not recovered anymore. This result points out