Backgrounds and Objectives: Since chromium is considered as a major risk in skin ,lung cancer, kidney and liver disorders , so the aim of present study was investigation to the removal of Cr(VI) using zeolite clinoptilolite from aqueous solution. Material & Methods: In this study, the adsorption of Cr(VI) from aqueous solution has been studied onto pretreated zeolite clinoptilolite by using batch test. Potassium dichromate (K 2 Cr 2 O 7 ) was used as the aqueous source of Cr(VI) and stock

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... on prepared by distilled water. Residual concentrations of Cr(VI) were measured by spectrophotometer at 540nm. Results: The results showed that with increasing Cr(VI) concentration removal capacity increased but decrease the time of equilibrium. Whit decreasing pH of 4 to 10, removal efficiency increased. Also time for contact zeolite was 70 minute. In overall, among the aforementioned Pretreated Zeolites (i. e., Al3+ and Fe3+ -modified zeolites), raw zeolite whit adsorption 45‰ was particularly found to create adsorption media with high capacity and specificity for Cr(VI). Conclusion: In general, it can be concluded that raw zeolite clinoptilolite economical method to remove for Cr(VI) from groundwater but don't removal efficiency method.