1دانشیار گروه شیمی، دانشکده علوم پایه، دانشگاه سمنان
2دانشجوی کارشناسی ارشد شیمی کاربردی، دانشکده علوم پایه، دانشگاه سمنان
چکیده
در این مطالعه از γ-آلومینای نانو ساختار به‌عنوان جاذب مناسب و جدید برای حذف کادمیم (II) از محلولهای آبی استفاده شد. سیستم جذبی ناپیوسته مورد استفاده قرار گرفت. مقادیر جذب تعادلی تابعی از pHمحلول، دما، زمان تماس، مقدار اولیه یون‌های کادمیم و مقدار جاذب است. ایزوترم‌های جذب مختلفی از جمله لانگمیر، فروندلیچ و تمکین مطالعه شد. بهترین مدل تطبیق یافته با داده‌های آزمایش‌های تعادلی برای γ-آلومینای نانوساختار، مدل لانگمیر بود. با بهره‌گیری از معادله مدل لانگمیر، حداکثر ظرفیت جذب γ-آلومینای نانو ساختار محاسبه و برابر با 76/92 میلی‌گرم بر گرم تعیین شد. مدل‌های سینتیکی مختلف برای توصیف داده‌های سینتیکی به‌کار رفتند و مدل سینتیکی شبه درجه دوم با نتایج منطبق بود. پارامترهای ترمودینامیکی فرایند جذب Cd2+ مانند انرژی آزاد (ΔG0) ، آنتالپی (ΔH0) و تغییرات آنتروپی (ΔS0) اندازه‌گیری شدند و طبیعت فرایند جذب پیش‌بینی شد.
1Assoc. Prof. of Chemistry, Faculty of Sciences, Semnan University, Semnan
2M.Sc. Student of Applied Chemistry, Faculty of Sciences, Semnan University, Semnan
چکیده [English]
In this study the use of nano structured γ-alumina as a new and convince adsorbent for removal of cadmium ions from aqueous solution was investigated. The equilibrium adsorption level was determined as a function of the solution pH, temperature, contact time, initial adsorbate concentration and adsorbent doses. Adsorption isotherms of Cd(II) on adsorbents were determined and correlated with common isotherm equations such as Langmuir, Freundlich and Tempkin models. The isotherm data fitted well to the Langmuir isotherm. The maximum adsorption capacity for Cd(II) on nano structured γ-alumina was 76.92 mg g-1. The adsorption kinetics was investigated and the best fit was achieved by a second-order equation. The thermodynamic parameters such as free energy (ΔG0), enthalpy (ΔH0) and entropy changes (ΔS0) for the adsorption of Cd(II) were computed to predict the nature of adsorption process.
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