کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
627492 | 1455465 | 2008 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The kinetic and thermodynamic studies of phenol-sorption onto three agro-based carbons
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In the present investigation, adsorption kinetics of phenol from aqueous media onto three agro-based adsorbents, namely Black Gram Husk (BGH), Green Gram Husk (GGH) and Rice Husk (RH), were carried out. The pseudo-first-order, Bhattacharya and Venkobachar, Natarajan and Khalaf, power function model, second-order kinetic model and intraparticle diffusion model were used to describe the kinetic data to estimate the rate constants. Free energy of adsorption (ÎG0), enthalpy (ÎH0), and entropy (ÎS0) changes were calculated to predict the nature of adsorption. The estimated values of ÎG0 for the agrowastes used were found to be low (-90.4267 kJ/mol K), thus, indicating spontaneity of the process. The negative value of ÎH0 (lowest BGH -42.36 kJ/mol and highest for RH - 34.31 kJ/ mol) will indicate the process is exothermic and the sorption behavior may be physio-sorption in nature. The positive values of ÎS0 of all the three agro-based adsorbents (range 0.11-0.14 J/mol K) shows the increased randomness at the solid/solution interface during the adsorption process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 225, Issues 1â3, 1 May 2008, Pages 220-234
Journal: Desalination - Volume 225, Issues 1â3, 1 May 2008, Pages 220-234
نویسندگان
V. Srihari, Ashutosh Das,