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دانلود مقاله Process Development for the Removal of Cr(VI) from Effluents Using Red Mud, an Aluminium Industry waste: Batch Studies فایل ورد (word) دارای 5 صفحه می باشد و دارای تنظیمات در microsoft word می باشد و آماده پرینت یا چاپ است

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توجه : در صورت  مشاهده  بهم ریختگی احتمالی در متون زیر ،دلیل ان کپی کردن این مطالب از داخل فایل ورد می باشد و در فایل اصلی دانلود مقاله Process Development for the Removal of Cr(VI) from Effluents Using Red Mud, an Aluminium Industry waste: Batch Studies فایل ورد (word) ،به هیچ وجه بهم ریختگی وجود ندارد

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سال انتشار: 1391
محل انتشار: دومین کنفرانس بین المللی آلومینیوم
تعداد صفحات: 5
چکیده:

Red mud is the waste material of alumina production industries. Hematite (Fe2O3) constituent of this material is an active component for adsorption of anion pollutants. In this study, removal of hexavalent chromium ions from aqueous solution using raw red mud (RRM) and chemically activated red mud (CARM) by nitric acid was investigated as an alternative to the conventional methods of Cr (VI) ions removal from industrial effluents. Raw and activated red muds were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The Results showed that activation of red mud by nitric acid resulted in an increase on the removal percentage of Cr (VI) ions from 55% to 97% for the following condition: initial pH of solution 2.5, activated red mud dosage of 10 g/L, contact time of one minute and initial Cr (VI) concentration of 10 mg/L at the temperature of 30 oC and mixing velocity of 500 rpm. The percentage of Cr (VI) ions removal increased with higher amounts of adsorbent and decreased with higher concentration of Cr (VI) ions. The results suggested that activated red mud could be used as effective and economical adsorbent for Cr (VI) ions removal from aqueous solutions.

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