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Introduction:Cr (VI) is a common and very toxic pollutant thus essential to be removed from contaminated wastewater before disposal into the environment. The aim of this study was removal of Cr (VI) from wastewater by granular and powdered seeds of Peganum Harmala. Methods: Peganum Harmala grains were first collected, cleaned and sieved. Then, Granular grains with 10 mesh size were used as the granular Peganum Harmala. Some Granular grains were powdered by grinder and 60 mesh size particles were used as powdered Peganum Harmala. A stock solution of Cr (VI) was prepared by K2Cr2O7 and a colorimetric method was used to analyze the Cr (VI) concentration using a UV/VIS T80+ spectrophotometer. The chemicals used in this study were obtained from Merck, Germany. Results: The result showed that the maximum removal of Cr (VI) was observed at pH 1.5 for both adsorbents, and with increasing amount of adsorbent, removal efficiency increased as well, but the adsorption capacity decreased. In all experiments the amount of chromium absorption by powdered Harmala Peganum was much more than the granular Harmala Peganum. Conclusion: The research results showed that the powdered seeds of Peganum harmala have the higher ability to absorb chromium. Thus, the powdered seeds of Peganum harmala can be considered as an inexpensive adsorbent in the removal of chromium

Keywords: : Peganum harmala, Chromium, Adsorbent

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