Breakthrough studies for Cr(VI) sorption from aqueous solution using exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite

Fixed bed adsorption column studies were carried out to assess the breakthrough performance of the polypyrrole-organically modified montmorillonite clay (PPy-OMMT NC) for removal of toxic Cr(VI) from water. The effects of bed mass, initial Cr(VI) concentration and flow rate on the bed performance were evaluated and a notable bed performance (3.2 L treated water) was achieved at high bed mass, low inlet Cr(VI) concentration and flow rate. Experimental data agreed well with the Thomas and Yoon–Nelson model. Based on performance data, it can be concluded that the PPy-OMMT NC is a competitive sorption media for Cr(VI) removal from aqueous environments.