3 years ago

Ability of a montmorillonitic clay to interact with cationic and anionic dyes in aqueous solutions

Ability of a montmorillonitic clay to interact with cationic and anionic dyes in aqueous solutions
A montmorillonitic clay in raw and treated forms (size-fractionated, organoclay, Al pillared) was evaluated as adsorbent for cationic (toluidine blue – TB and malachite green – MG) and anionic (Congo red – CR) dyes. A thorough characterization using XRD, SEM-EDS, N2 adsorption, and FTIR of the considered samples was realized, all highlighting the structural changes after various treatments. UV–VIS analysis demonstrated the interaction between dyes and the adsorbent surface. The investigation of the effects of various experimental parameters using a batch adsorption technique showed that ON has a high adsorption potential for cationic dyes (33 and 39 mg/g in case of TB and MG, respectively). The kinetic study indicated that the adsorption process followed the pseudo-second-order model, while Freundlich isotherm showed a favorable adsorption. The calculated values of Gibbs free energy suggested also that the adsorption is spontaneous and is more favorable at higher temperatures.

Publisher URL: www.sciencedirect.com/science

DOI: S0022286017313698

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