The aim of this work was evaluate the adsorption properties of anionic dye Reactive Black 5 (RB5) and cationic dye Methylene Blue (MB) from salted aqueous solution using natural clay, aluminum pillared clay (Al-PILC) and activated carbon. The textural properties of the materials were obtained by N 2 adsorption at 77 K and structural properties of natural and pillared clays were determined by Xray diffraction. The effect of pH, contact time, initial concentration of dye and influence of the addition of NaCl were evaluated by batch adsorption. Adsorption isotherms of Al-PILC, in different salt concentration, were compared with natural clay and activated carbon. The adsorption isotherms were well fitted by Langmuir and Langmuir-Freundlich models. The process of pillaring only improved the adsorption of the anionic dye RB5. Depending on the system adsorbent/adsorbate analyzed, the salt concentration can either help or hinder dye adsorption. We found that a special morphology formed during the process of pillaring greatly increased adsorption of the MB cationic dye in the range of high salt concentrations. This unexpected result may help in developing new pillarization strategies to treat effluents with high salt content.

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Surface modified mesoporous nanocast carbon can promote aqueous sulfide oxidation adsorbing the produced polysulfides.