Removal of Cr(VI) from aqueous solutions by Zea mays rachis (ZMR) was studied. The BET surface area of the Zea mays material was 1.25 ± 0.01 m2g-1, with an average pore size of 4.71 nm. Experimental data show a 100% of Cr(VI) is removed in a period of 4 hours at pH between 1 and 3. A pH value of 3 was chosen for the adsorption studies, with a maximum adsorption capacity of 2 mg g-1 and a Cr(VI) adsorption percentage onto ZMR of 98.6%. The Freundlich model represented the equilibrium of the adsorption process better than Langmuir model. The adsorption kinetics of Cr(VI) onto ZMR were well defined using the pseudo-second order model. The results showed that ZMR is a potential biomaterial for Cr(VI) removal and pH has an important effect on metal adsorption capacity. The Cr(VI) reduction to Cr(III) was observed during the adsorption process.