IJE TRANSACTIONS C: Aspects Vol. 27, No. 6 (June 2014) 839-854   

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R. O. Ajemba
( Received: August 10, 2013 – Accepted: December 12, 2013 )

Abstract    The adsorption of malachite green from aqueous solution using a local low cost adsorbent, acid activated Ntezi clay, was investigated. The low cost adsorbent was activated with different concentrations of sulphuric acid and the physicochemical properties of the adsorbent were determined and the structural properties were analyzed using XRF and XRD. The adsorption process was studied as a function of different process parameters such as temperature, adsorbent dosage, contact time, particle size and stirring speed. These process parameters were optimized using response surface methodology (RSM). The significance of the different process parameters and their combined effect on the adsorption efficiency has been established through a full factorial central composite design. The equilibrium modeling was analyzed using Langmuir, Freundlich, Dubini-Radushkevich and Temkin isotherm equation and the results of the experimental data follows the Langmuir adsorption isotherm. Adsorption kinetics follows the pseudo-second order with intra-particle diffusion as the rate-determining step. This investigation has shown that local clay mineral can be modified and used as a good adsorbent in the removal of impurities from contaminated water.


Keywords    Adsorption, Equilibrium, Kinetics, Isotherm, Optimization, Malachite green, Clay


چکیده    جذب مالاشیت گرین از محلول آبی با استفاده از جاذب کم هزینه محلی، خاک رس Ntezi فعال شده با اسید بررسی شده است. جاذب کم هزینه با غلظت های مختلف از اسید سولفوریک، فعال و خواص فیزیکو شیمیایی جاذب تعیین شد. خواص ساختاری با استفاده از XRF و XRD آنالیز شده است. فرایند جذب به صورت تابعی از پارامترهای مختلف فرایند از قبیل دما، مقدار جاذب، زمان تماس، اندازه ذره و سرعت همزن مطالعه گردید. پارامترهای فرایند با استفاده از روش پاسخ سطح (RSM) بهینه شد. اهمیت پارامترهای مختلف فرایندی و اثر ترکیب آنها روی بازده جذب از طریق طراحی ترکیب مرکزی فاکتوریل کامل پایه گذاری شد. مدل سازی تعادل با استفاده از معادلات لانگمویر، فرندلیچ، دوبینی- رادوشکویچ و ایزوترم تمکین آنالیز شد. نتایج آزمایشگاهی از ایزوترم جذب لانگمویر پیروی کرد. سینتیک جذب از معادله شبه درجه دوم با نفوذ خارج ذره ای به عنوان مرحله تعیین کننده سرعت پیروی کرد. این بررسی نشان داد که خاک رس معدنی محلی می تواند اصلاح شود و به عنوان یک جاذب خوب برای حذف ناخالصی ها از آب مورد استفاده قرار گیرد.



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