The removing zinc cation from aqueous solution by Ca-bentonite and Na-exchanged bentonite was studied. The factors such as the initial concentration of Zn, the liquid-to-solid ratio, pH, adsorption time, stirring speed, coexisting ions, temperature and bentonite particle size were investigated. The results show that the adsorption process of bentonite accorded with the Freundlich isotherm model...

Bentonite is montmorillonite type layered clay and has high cation exchange capacity (CEC) because of its typical silicate structure. The bentonite was treated with hydrochloric acid to obtain H-bentonite which further modified by incorporating Fe(Ⅲ) into it. Fe-bentonite characterized XRD FTIR analyses. specific surface area the adsorbent obtained from Methylene Blue Adsorption Method 598 m2/g...

the textile industry has long been one of the largest of water users and nolluters and there has been little success in developing low cost treatment methods , which the industry urgently needs to lessen the pollution loads it discharges to streams. the obiective of this preparatory study was to determinen the effects o f coagulants and aid coagulant s as alum, ferrous sulfate , ferric sulfate ...

The purpose of the work was to investigate sorptive capacity natural clay samples with respect 90 Sr and 137 Cs assess possibility using these as components protective barriers at radioactive waste isolation facilities. Bentonite clays Zyryanskoye Desyaty Khutor deposits high-melting Kampanovskoye deposit were selected for investigation. sorption through ionic exchange is characterized by value...

In this study, the analysis of study effect reagents upon receipt cargo was highlighted—nanocomposite bentonite sorbents using Sol–gel technology and results obtained were highlighted. The comparative surface calculated at 77 K a nitrogen adsorption isotherm. size pore catalysts determined from data on desorption isotherms, respectively, relative pressure R/ro=0.99 in accordance with BJH (Baret...

Studies on changes of unfrozen water content in calcium bentonite from Slovakia, with various concentrations copper ions, were carried out using the method differential scanning calorimetry (DSC). In this study, influence molar concentration copper(II) chloride solution (1 M, 0.5 0.25 0.1 M), used to saturate clay, was analyzed, as well impact ions contained and how affects versus temperature. ...

Abstract This paper presents a constitutive model that predicts the water retention behaviour of compacted clays with evolving bimodal pore size distributions. In line previous research, differentiates between present inside saturated pores clay aggregates (the microstructure) and macrostructure). A new formulation is then introduced to account for effect macrostructural porosity changes on soi...

Raw bentonite (RB), a known low-cost versatile clay was used as an adsorbent. RB was treated thermally and chemically to increase its adsorption capacity. For thermal treatment (TTB), the bentonite was heated at 400 °C for 60 min, and for the chemical modification, its surface was treated by cetyltrimethylammonium bromide (CTAB) to prepare organo-modified bentonite (CTAB-B). The removal of Cong...

tashtab mountain is located 25 km from the city of khur in northeastern isfahan province. several bentonite mines formed in this area as a result of the eocene volcanic alteration. these mines are classified as the khur bentonite horizon. studies on trace elements in parent rock and clays show that the studied bentonites formed from andesite-basaltic parent rocks. the xrd analysis shows that st...