A study of regeneration of the ion exchange resins using a sub-critical mixture of CO2-H2O solution was reported. The experimental data were obtained by measuring the outlet concentration of ions Cd eluated from a column packed with a commercial ion exchange resin Amberlite IRC-86 until the effluent reached the input concentration. The adsorption isotherm was also reported. The correlation of t...

Micellar-enhanced ultrafiltration (MEUF) of zinc ions (Zn2+) from aqueous solutions using single anionic surfactant sodium dodecyl sulphate (SDS) at low critical micelle concentrations (cmc) (0.2×cmc – 3×cmc) was investigated. When the initial SDS concentration was below the cmc, unexpectedly high rejection (97.5%) was obtained due to concentration polarisation occurring near the membrane-solut...

A new polymeric resin poly(maleic acid –acrylamide )-Cesium P(MA-AM)-Cs was prepared by gamma radiation-induced co-polymerization of maleic acid ( MA) with acrylamide (AM) in the presence of cesium chloride CsCl as a metal salt in aqueous solution route at 25 KGy to be used as a sorbent. The polymeric resin was characterized using Fourier transform infra-red spectroscopy (FTIR), simultaneous th...

In chromatographic separations involving elutes with large differences in the molecular size, the adsorption saturation capacities of the elutes may differ because of the differences in the degree of size exclusion. With uneven saturation capacities, isotherm crossovers may occur, which often results in selectivity reversal. In this work, a new multicomponent isotherm has been developed for thi...

A simple ion imprinted amino-functionalized sorbent was synthesized by coupling activated carbon with iminodiacetic acid, a functional compound for metal chelating, through cyanoric chloride spacer. The resulting sorbent has been characterized using Fourier transform infrared spectroscopy (FT-IR), elemental analysis, thermogravimetric analysis (TGA) and evaluated for the preconcentration and de...

An improvedmodel of the fundamental plasma emission of type III solar radio bursts is presented. It is shown that nonlinear conversion of a traveling Langmuir pump wave into an electromagnetic wave can occur via either convective or absolute hybrid modulational instabilities, resulting from the coupling of two wave triplets, with the Langmuir pump wave and ion-acoustic daughter wave common to b...

mercury is one of the most toxic heavy metals present in aquatic systems, exhibiting a complex behaviour in the environment, where it may persist for decades after the source of pollution is stopped. hence, it is important develop new techniques for its removal from the aquatic systems. in this context, a particularly promising line of research is the use of new materials capable of up taking m...

In this study, Fe(III)-cross-linked chitosan beads (Fe(III)-CBs) were synthesized and employed to explore the characteristics and primary mechanism of their hexavalent chromium (Cr(VI)) adsorption under low concentration Cr(VI) (less than 20.0 mg l-1) and a pH range from 2.0 to 8.0. Batch tests were conducted to determine the Cr(VI) adsorption capacity and kinetics, and the effects of pH and te...

The interaction of ions with interfaces and, in particular, the high specificity of these interactions to the particular ions considered, are central questions in the field of surface forces. Here we study the effect of different salts (NaI, NaCl, CaCl₂ and MgCl₂) on monolayers made of cholesterol molecules, both experimentally (surface area vs. lateral pressure isotherms measured by a Langmuir...

heavy metals such as cu(ii) and pb(ii) are among the hazardous pollutants that lead to severe ecological problems and have a toxic effect on living organisms. the removal of cu(ii) and pb(ii) by iranian bentonite experiment were conducted in single component and multi component systems. the bentonite from the birjand area was characterized by x-ray diffraction pattern and ftir spectroscopy. the...