فصلنامه علوم محیطی

فصلنامه علوم محیطی

حذف کروم شش ظرفیتی از آب های آلوده بوسیله برگ زرشک بعنوان جاذبی ارزان قیمت

نوع مقاله : Original Articles

نویسندگان
علیرضا پورخباز 1
نجمه بوسعیدی 2
مسلم جهانی 3
1 استادیار گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه بیرجند، بیرجند
2 دانشجوی کارشناسی ارشد آلودگی های محیط زیست، دانشکده منابع طبیعی، دانشگاه بیرجند، بیرجند
3 دانشجوی دکترای شیمی تجزیه، دانشکده شیمی، دانشگاه بیرجند،بیرجند
چکیده
    آلودگی محیط زیست توسط فلزات سنگین به خوبی به رسمیت شناخته شده است و می تواند برای موجودات زنده مضر باشد. فلزات انتقال یافته به محیط زیست ممکن است دستخوش تحولات شده و بر محیط­های آبی، سلامت عمومی و اقتصاد تاثیر بزرگی داشته باشند و با توجه به اثرات جدی زیست محیطی و بهداشتی فاضلاب حاوی کروم (VI) باید با آن قانونمند برخورد شود. در این مقاله هدف بررسی حذف کروم شش ظرفیتی از محلول های آبی توسط برگ زرشک می باشد. اثر پارامترهای مختلفی نظیر اسیدیته، زمان تماس، مقدار جاذب و غلظت اولیه در حالت ناپیوسته مورد بررسی قرار گرفته است. یافته های این بررسی نشان می دهد حداکثر فرایند جذب در اسیدیته برابر 2، غلظت اولیه 80 میلی گرم بر لیتر و دمای 25 درجه سانتیگراد با زمان تماس 10دقیقه و سرعت 200دور بر دقیقه صورت می گیرد. ارزیابی نتایج تجربی با مدل های ایزوترم وسینتیک نشان می­دهد که فرایند جذب با ایزوترم لانگمویر و مدل سنتیکی شبه مرتبه دوم بهترین تطابق را دارد.
کلیدواژه‌ها
محلول های آبی
حذف کروم
برگ زرشک
ایزوترم

عنوان مقاله English

Removal of Chromium (VI) from Polluted Water using Barberry Leaf as a Cheap Absorbent

نویسندگان English

Alireza Pourkhabbaz 1
Najme Boosaeidi 2
Moslem Jahani 3
1 Assistant Professor, Department of Environmental Science, Faculty of Natural Resources, University of Birjand, Birjand
2 MSc. Student of Environmental Pollution, Faculty of Natural Resources, University of Birjand, Birjand
3 PhD.Student of Analytical Chemistry, Faculty of Chemistry, University of Birjand, Birjand
چکیده English

It is now well recognized that heavy metals in the environment cause pollution that can be harmful to living organisms. Without control, heavy metals that are transferred to the environment may undergo significant changes and have a serious impact on aquatic environments, public health and economics. In view of the serious detrimental effect to the environment and health of wastewater containing Cr (VI), there is an urgent need for regulation. The objective of the present study was to investigate Cr (VI) removal from aqueous solutions using barberry leaves. The effects of parameters such as acidity, contact time, sorbent dose and initial concentration were evaluated for batch mode. Results showed maximum adsorption in an acidic medium at pH level 2; initial Cr(VI) concentration of 80 mg L−1 and temperature of 25◦C with a contact time of 10 min at 200 rpm stirring speed. Test results were analysed by adsorption isotherms and kinetics modelling and the best adaptation was made by the Langmuir isotherm and the second best by the para-stage synthetic model.

کلیدواژه‌ها English

Keywords:chromium removal
aqueous solutions
barberry leaves
Isotherm
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فصلنامه علوم محیطی
دوره 11، شماره 4
زمستان 1392