The effect of the number of amino acid residues in L-glycyl-L-glycine and L-glycyl-L-glycylL-glycine on thermal stability of powders, the sorption properties and surface morphology of thin films has been found. Dipeptide forms the film coated with disk-shaped nano-objects on the hydrophilic substrate, while tripeptide self-organizes to the film coated with nano-crystals on the hydrophobic subst...

The use of raw sawdust, RSD, of locust bean tree (Parkia biglobosa), a low-cost, locally available agroforestry waste as an adsorbent for removing a ternary mixture of heavy metals comprising of copper, lead and nickel (TMS) from aqueous solution was examined. Equilibrium data obtained from batch adsorption experiments were analysed with Langmuir, Freundlich and Temkin isotherm models, with Lan...

A biomass agricultural waste material, olive stone (OS) was used for preparation of activated carbon (AC) by chemical activation using 50% phosphoric acid (PA5) carbonized at 800C and holding time 90 min (OSPA58).The prepared AC was used for sorption of La(III) ions from nitrate solution.The effect of various factors such as shaking time, pH, carbon dose, particle size and different temperature...

In this article, the pervaporation selectivity as a function of the membrane thickness is studied for the dehydration of acetic acid. From this study, it appeared that the selectivity of polysulfone (PSF) , poly (vinyl chloride) (PVC ) , and polyacrylonitrile (PAN) decreases with decreasing membrane thickness, below a limiting value of about 15 pm. However, in the case of gas separation, the se...

The first publication on the use of polyurethane foam (PUF) for sorption processes dates back to 1970, and soon after the material was applied for separation processes. The application of PUF as a sorbent for solid phase extraction of inorganic analytes for separation and pre-concentration purposes is reviewed. The physical and chemical characteristics of PUF (polyether and polyester type) are ...

A consistent thermodynamic model is developed for metal sorption on expanding 2:1 layer clays such as montmorillonite. The particle of clay, including lamellae and interlayers, is represented as a porous solid bearing a permanent negative charge (resulting from isomorphic substitution) with an infinite plane interface (i.e., edges) with the solution. Cation exchange occurs inside the clay parti...

In continuation to our recent study on the synthesis and characterization of starch-silica nanocomposite, in the present study the nanocomposite has been evaluated for the removal of Cd(II) from the aqueous solution. The conditions for the sorption have been optimized and kinetic and thermodynamic studies were performed to understand the adsorption behaviour of the composite. Though the cadmium...

In this article, the sorption of vapors various alcohols by cellulose samples has been studied. Isotherms all studied have a sigmoid shape combining multilayer surface adsorption and absorption with capillary condensation at final stage. To separate from condensation, thermodynamic equation was used describing only process. It found that methanol vapor performed via alcohol molecules accessible...

Abstract Sorption properties of Greek bentonites and zeolites were investigated in raw form after irradiation for removal Cs, Co Eu from aqueous solutions using 137 60 152 as tracers γ-spectroscopy. The sorption experiments undertaken under different conditions (pH, concentration, competitive ions temperature). structural changes the sorbents due to metal examined through XRD, FTIR SEM/EDS. iso...