بررسی سینتیک و ایزوترم جذب کادمیم از محلولهای آبی توسط نانورس‌ها

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد عمران- محیط زیست، دانشکده علوم آب، دانشگاه شهید چمران، اهواز

2 دانشیار گروه مهندسی عمران- محیط‌زیست، دانشکده علوم آب، دانشگاه شهید چمران، اهواز

3 دانشیار گروه مهندسی بهداشت محیط و عضو مرکز تحقیقات فناوری‌های زیست‌محیطی، دانشکده بهداشت، دانشگاه علوم پزشکی جندی‌ شاپور، اهواز

4 دانشجوی دکترای عمران، دانشکده مهندسی، دانشگاه بوعلی سینا، همدان

چکیده

در این پژوهش به بررسی استفاده از نانورس کلوزایتNa+ برای حذف (Cd(II از محلولهای آبی پرداخته ‌شد. این مطالعه در مقیاس آزمایشگاهی در سیستم ناپیوسته و تحت شرایط محیطی مختلف از جمله تغییرات pH ، زمان تماس، مقدار نانورس و غلظت کادمیم در محلول پرداخته شده است. سینتیک‌های جذب کادمیم بر روی جاذب نانورس بر اساس مدل‌های هو و همکاران و لاگرگرن بررسی شد و ضرایب ایزوترم‌های جذب لانگمیر و فروندلیچ بر مبنای شرایط بهینه محاسبه گردید. نتایج نشان داد که با افزایش pH از 2 تا 8 کارایی جذب افزایش می‌یابد. افزایش زمان تماس باعث افزایش کارایی جذب شد و با افزایش مقدار جاذب کارایی افزایش یافت. همچنین داده‌های به‌دست آمده در این تحقیق برای جاذب نشان می‌دهد جذب کادمیم از مدل سینتیک هو و همکاران و لاگرگرن و همچنین از ایزوترم فروندلیچ تبعیت می‌کند. بر اساس یافته‌های به‌دست آمده از این پژوهش می‌توان نتیجه گرفت که نانورس جاذب بسیار خوبی برای حذف کادمیم از محیط‌های آبی، حتی در غلظتهای بالا است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Kinetics and Isotherms of Adsorption of Cd(II) Ions on Nanoclay from Aqueous Solution

نویسندگان [English]

  • farzaneh Motamedi 1
  • Hadi Moazed 2
  • Nematollah Hafarzadeh haghighifard 3
  • Mohammad Amiri 4
چکیده [English]

In the present work, adsorptive removal of Cd)II( from aqueous solution was studied by using nanoclay (Cloisite Na+). This study was implemented under laboratory conditions in single batch system by adsorption under various environmental conditions such as pH, contact time, adsorbent dose and adsorbate concentration. The kinetics of Cadmium adsorption was determined based on Ho et al & Lagergern. Then Langmuir and Freundlich coefficient were determined based on optimum conditions. The Result of this study was showed with increasing of pH from 2 to 8; the adsorption efficiency will be increased. With increasing contact time adsorption efficiency increased. It was also fundwith increasing amount of nanoclay adsorbent, efficiency increased. The results revealed that the results of this research for nanoclay adsorbent is closed to fit Ho et al and Lagergren kinetic and Freundlich isotherm Based on data obtained in this study it can be concluded that adsorption by nanoclay  is an efficient and reliable method for cadmium removal from liquid solutions.

کلیدواژه‌ها [English]

  • Nanoclay
  • Cadmium
  • Adsorption
  • Kinetic
  • Isotherm
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