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Montmorillonite was employed as adsorbent to remove cationic and anionic dyes respectively and simultaneously. When the dye present singly, it only had a good effect to cationic dye removal. The experimental data well fitted to pseudo-second-order kinetic model, and the adsorption behavior followed the Langmuir model revealed that cationic dye adsorption was a monolayer coverage and charge-limited...