مطالعه رفتار سینتیکی و تعادلی جذب یون کادمیم از محلول آبی با استفاده از نانو ذرات پوست تخم مرغ

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه مهندسی شیمی، واحد امیدیه، دانشگاه آزاد اسلامی، امیدیه، ایران

2 گروه مهندسی شیمی، واحد بوشهر، دانشگاه آزاد اسلامی، بوشهر، ایران

چکیده

فلزات سنگین درون محیط تجزیه ناپذیر بوده و می­توانند برای بسیاری از گونه­های جانوری خطرناک باشند. به همین دلیل، حذف یون فلزات سنگین از آب و فاضلاب به منظور سلامت عمومی و محیط زیست فرآیندی مهم محسوب می­شود. در این بررسی به منظور حذف یون کادمیوم از محلول آبی از نانوجاذب تهیه شده از پوست تخم مرغ استفاده شد. بر این اساس، اثر پارامترهای مختلفی مانند pH اولیۀ محلول آبی، دوز جاذب، زمان تماس، غلظت اولیۀ یون کادمیوم و همچنین سرعت اختلاط مورد بررسی قرار گرفت. بهترین بازدهی حذف یون کادمیوم1/99% تعیین شد که این بازدهی برای نانو پوست تخم مرغ در شرایط آزمایشگاهی نظیر دمای °C30، سرعت اختلاط rpm200، دوز جاذب g/L5، غلظت اولیۀ یون کادمیوم درون محلول آبی mg/L20 و pH 9 به دست آمد.به منظور بررسی رفتار سینتیکی جاذب از مدل­های سینتیکی شبه مرتبۀ اول و دوم استفاده شد که مدل سینتیکی شبه مرتبۀ دوم توانایی بیشتری برای توصیف رفتار سینتیکی نانوجاذب داشت. همچنین برای بررسی رفتار ایزوترمی از مدل­های لانگمویر و فرندلیچ استفاده شد که هر دو مدل توانایی بالایی برای توصیف رفتار ایزوترمی نانوجاذب نشان دادند. با توجه به نتایج به دست آمده، جاذب مورد نظر با توجه به فراوانی و ارزان بودن آن برای حذف فلز کادمیوم از محلول­های آبی بسیار مناسب است.

کلیدواژه‌ها


عنوان مقاله [English]

Equilibrium and kinetic studies of adsorption of Cd ions from aqueous solutions using egg shell nano particles

نویسندگان [English]

  • Behzad Shamsi zadeh fard 1
  • Hosein Esmaeeli 2
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