دانشگاه علوم پزشکی و خدمات بهداشتی درمانی شهید صدوقی یزد
Abstract
Background: Cr (VI) is a common and very toxic pollutant which it is essential to remove Cr (VI) from contaminated wastewater before disposal into the environment by an effective process. The aim of this study was Cr (VI) removal from wastewater by granular and powdered seeds of Peganum Harmala.
Materials and Methods: Peganum Harmala grains was collected and after separating and cleaning the Harmala grains done using a sieve. Thus, Granular grains with 10 mesh size were used as the granular Peganum Harmala. Some Granular grains 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 shows that the maximum removal of Cr (VI) was observed at pH 1.5 for both adsorbents, and with increasing amount of adsorbent was increased removal efficiency, but the adsorption capacity decreased. With increasing detention time and mixing speed was upside trend the absorption of chromium by both the absorbent, but with increasing initial concentration of chromium showed a downward trend. In all experiments the amount of chromium absorption by powdered Harmala Peganum was much more from the granular Harmala Peganum.
Conclusion: The research results shown that the powdered seeds of Peganum harmala ability to absorb chromium more grain than it is granular. Thus, the powdered seeds of Peganum harmal could be considered as an inexpensive adsorbent in the removal of chromium
