RETRACTED: Designed pendant chain covalently bonded to analogue of heulandite for removal of divalent toxic metals from aqueous solution: Thermodynamic and equilibrium study

Adsorption of arsenic ions on Brazilian sepiolite: Effect of contact time, pH, concentration, and calorimetric investigation

“…The adsorption experiments were performed through the batchwise method by suspending a series of 20 mg samples of the solid, in 20.0 cm 3 aqueous solutions of cations at concentrations varying from 1.25 Â 10 À2 to 2.50 Â 10 À2 mmol dm À3 , under orbital stirring for 24 h at 298 ± 1 K [19,20]. Profiles of the obtained adsorption isotherms represented by the number of moles adsorbed (N f ), versus the number of moles at equilibrium per volume of solution (C S ), for series of isotherms, the data reveal that the adsorption process conforms to the Sips model.…”

Organofunctionalized Amazon smectite for dye removal from aqueous medium—Kinetic and thermodynamic adsorption investigations

“…The advances in the organofunctionalization field are closely associated with development of new silylating agents, which pendant organic chains can display non-hydrolyzable silicon-carbon bond, to prevent the leaching of the immobilized reagent to solution. However, as the pendant chains incorporate donor basic atoms, an improvement on adsorption and exchange properties are normally increased [2,3]. Various conventional and non-conventional adsorbents have been explored for removal of different metal ions from aqueous.…”

“…The possibility of an organofunctionalization reaction prior to dye adsorption would increase the capacity of adsorption by the chemically modified materials [8][9][10][11][12][13]. For this purpose, natural Amazon smectite was chosen as a source of layered silicate, since its surface contains a high degree of regularly distributed silanol groups in the space interlayer that favor organomodification reactions [3].…”