بررسی جذب زیستی کادمیم (II) از محیط آبی به‌وسیله زیست توده اصلاح شده سراتوفیلیوم دمرسوم (Ceratophyllum demersum L.)

آب و خاک

مقاله 4، دوره 32، شماره 3 - شماره پیاپی 59، تابستان 1397، صفحه 531-545  

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v32i3.66197

نویسندگان

حسین شکری پور¹؛ منا گلابی ¹؛ هادی معاضد¹؛ نعمت جعفرزاده حقیقی فرد²

¹دانشگاه شهید چمران اهواز

²دانشگاه علوم پزشکی و خدمات بهداشتی درمانی جندی شاپور اهواز

چکیده

در این تحقیق، اثر جاذب اصلاح شده سراتوفیلیوم دمرسوم بر حذف فلز سنگین کادمیم بررسی گردید. با استفاده از آزمایش‌های جذب ناپیوسته اثر اسیدیته (pH)، زمان تماس، مقدار جاذب و غلظت اولیه کادمیم بر میزان حذف کادمیم، هم‌چنین مدل‌های سینتیک و هم‌دمای جذب بررسی شدند. با افزایش pH از سه تا هشت، راندمان حذف ابتدا از 93% تا 97% افزایش، سپس به 85% کاهش یافت. ظرفیت جذب نیز از 04/7 تا 35/7 افزایش سپس تا 44/6 میلی‌گرم بر گرم کاهش و pH بهینه هفت به‌دست آمد. با افزایش زمان تماس از 5 تا 240 دقیقه، راندمان حذف از 67% تا 98%، تا زمان 180 دقیقه افزایش و سپس اندکی کاهش یافت. ظرفیت جذب نیز از 25/6 تا 13/9 میلی‌گرم بر گرم افزایش و سپس اندکی کاهش یافت و زمان تعادل 60 دقیقه به‌دست آمد. با افزایش مقدار جاذب از 02/0 تا 4 گرم بر لیتر، راندمان حذف 37% تا 99% افزایش یافت، ظرفیت جذب از 5/169 به 35/2 میلی‌گرم بر گرم کاهش یافت و مقدار جاذب یک گرم بر لیتر به‌عنوان مقدار بهینه به دست آمد. با افزایش مقدار غلظت اولیه کادمیم از 10 تا 200 میلی‌گرم بر لیتر، راندمان حذف از 96% به 31% کاهش، ظرفیت جذب از 18/9 به 7/59 افزایش و غلظت ده میلی‌گرم بر لیتر به‌عنوان غلظت اولیه بهینه انتخاب گردید. مدل سینتیک شبه درجه دوم با ضریب تعیین 99/0 و مدل لانگمویر نیز با ضریب تعیین 99/0، از برازش بهتری نسبت به سایر مدل‌ها برخوردار بود. نتایج تحقیق قابلیت بالای سراتوفیلیوم دمرسوم را، به‌عنوان جاذب زیستی برای حذف کادمیم، تأیید نمود.

کلیدواژه‌ها

جاذب؛ راندمان حذف؛ مدل سینتیک؛ مدل لانگمویر

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