Preparation of nano composite was reacted between Ca-bentonite and CuFe204 became CuFe204-Ca bentonite composite. The aimed of this research was to determined the optimum absorption of CuFe204-Ca bentonite composite to adsorb Cr(VI). Preparation of CuFe204 and CuFe204-Ca bentonite composites prepared by coprecipitation from CuCl2 and FeCb compounds with ratio of CuFe204 : Ca- bentonite = 2:1. C…