Temperature effects in barium sorption on natural kaolinite and chlorite-illite clays

Abstract

The sorption of Ba 2+ ion on natural kaolinite and chlorite-illite clays was investigated at different initial concentrations and temperatures using the radiotracer method. The sorption data were well described by Freundlich and Dubinin-Radushkevich isotherms. Ba 2+ sorption on both clays showed an exothermic behavior with H° (kJ/mol) values being -7 and -5 for sorption on kaolinite and chlorite illite mixed clay, respectively. The G° values indicate that the sorption was spontaneous with sorption energies corresponding to ion-exchange type sorption. X-ray diffraction studies showed that no significant change in the matrix of the clays occurred upon Ba 2+ sorption.

A comparative study of microwave and chemically treated Acacia nilotica leaf as an eco friendly adsorbent for the removal of rhodamine B dye from aqueous solution

“…It can be used to describe adsorption on both homogenous and heterogeneous surfaces (Shahwan and Erten, 2004). The D-R equation can be defined by the following equation (Dubinin and Radushkevich, 1947;Gregg and Sing, 1982):…”

Sorption of radioactive cesium and barium ions onto solid humic acid

“…Freundlich isotherm model [3] is one of the most used non-linear model for describing the dependence of sorption on sorbate concentration. This model allows for several kinds of sorption sites on solid and represents properly the sorption data at low and intermediate concentrations on heterogeneous surfaces.…”

“…This radionuclide is a serious radiocontaminant, furthermore being a homologue of Ra, Ba 2+ is a suitable cation for the radiochemical study of Ra 2+ , which has several radioisotopes that are important in radioactive waste considerations. 133 Ba 2+ was chosen as a radiotracer in our studies because of its long half-life (T 1/2 = 10.7 yr) and a ␥-ray at 356 keV energy [3].…”

Adsorption and Reduction of Chromium(VI) from Aqueous Solution by Multiwalled Carbon Nanotubes

“…The D-R isotherm model is valid at low concentration ranges and can be used to describe adsorption on both homogeneous and heterogeneous surfaces [21]. The D -R equation has the general expression: (8) or in the linear form: 2 ln ln = m q q (9) where q m (mmol/g) is the D-R monolayer capacity, (mol 2 /kJ 2 ) is the constant related to the adsorption energy, and is the Polanyi potential, which equals to:…”