Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 31, No. 1 (January 2018) 1-11   

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  ADSORPTION OF MALACHITE GREEN FROM AQUEOUS SOLUTION BY NANOZEOLITE CLINOPTILOLITE: EQUILIBRIUM, KINETIC AND THERMODYNAMIC STUDIES
 
R. Heydari and M. Khavarpour
 
( Received: September 29, 2017 – Accepted in Revised Form: November 30, 2017 )
 
 

Abstract    The object of present study was to examine the adsorption potential of nanozeolite clinoptilolite (CP) for the removal of malachite green (MG) from aqueous phase in a batch equilibrium system. SEM, EDX, XRF, XRD and FT-IR techniques of characterization of zeolite were applied. The effects of initial pH solution, adsorbent dose, temperature, contact time and initial MG concentration on adsorption were evaluated. Adsorption experiments were conducted at initial concentrations in the range of 10–50 mg/L and temperatures at 25, 30 and 35°C. MG adsorption uptake was found to increase with an increase in contact time, initial MG concentration and solution temperature. The adsorption equilibrium data revealed the best fit with Koble-Corrigan model. The kinetics of MG on adsorbent followed the pseudo-second-order model. In addition, the assessment of kinetic data depicted that the adsorption rate was controlled by intraparticle diffusion mechanism. The negative values of standard Gibbs free energy represented the spontaneous adsorption at the stated temperature. The positive values of enthalpy and entropy changes also confirmed the increased randomness and endothermic nature of MG adsorption on nanozeolite CP adsorbent. Furthermore, the obtained activation energy showed the physical adsorption process.

 

Keywords    Adsorption Kinetics; Thermodynamics; Malachite Green; Nanozeolite Clinoptilolite; Isotherm Models

 

چکیده    هدف از مطالعه حاضر، بررسی پتانسيل جذب نانو زئولیت کلینوپتیلولیت (CP) برای حذف مالاچیت گرین (MG) از فاز آبی در یک سیستم تعادلی ناپیوسته است. تکنیکهای SEM، EDX، XRF، XRD و FT-IR برای مشخص کردن خصوصیات زئولیت استفاده شد. اثرات pH اولیه محلول، دوز جاذب، دما، زمان تماس و غلظت اولیه MG در جذب مورد بررسی قرار گرفت. آزمایش های جذب در محدوده غلظت های اولیه 10-50 میلی گرم در لیتر در دمای 25، 30 و 35 درجه سانتیگراد انجام شد. میزان جذب MG با افزايش زمان تماس، غلظت اوليه MG و دماي محلول افزايش يافت. داده های تعادلی جذب مناسب ترین تطابق را با مدل کوبل-کوریگان نشان دادند. سینتیک MG روی جاذب از مدل شبه درجه دوم پیروی کرد. علاوه بر این، ارزیابی داده های سینتیکی نشان داد که میزان جذب توسط مکانیسم نفوذ درون ذره ای کنترل می شود. مقادیر منفی انرژی آزاد گیبس استاندارد، جذب خود به خودی را در دماهای مورد مطالعه نشان داد. مقادیر مثبت تغییرات آنتالپی و آنتروپی نیز تصادفی بودن و طبیعت گرماگیر بودن جذب MG را بر روی جاذب نانوزئولیت CP تأیید می کنند. علاوه بر این، انرژی فعال به دست آمده، روند جذب فیزیکی را نشان می دهد.

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