کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
625856 | 1455436 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Studies on Chromium (VI) adsorption on sulfonated lignite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Sulfonated lignite was prepared in order to study the adsorption behavior and the removal of Cr (VI) ions from aqueous solutions as a function of contact time, initial pH, using batch technique. Adsorption data of Cr (VI) on the sulfonated lignite were analyzed according to Langmuirï¼Freundlich and Temkin adsorption models. Thermodynamic parameters for the adsorption system were determinated at 293 K, 303 K and 313 K. (ÎH° = 14.16 kJ molâ 1; ÎGO =â4.43 toâ5.71 kJ molâ 1 and ÎS = 63.42 J Kâ 1 molâ 1). The numerical values obtained showed that Cr (VI) adsorption is a spontaneous, entropy-driven and endothermic process. The process kinetics was evaluated by pseudo-first, pseudo-second order and Elovich kinetic models. Elovich kinetic model exhibited the highest correlation with data. These results show that the sulfonated lignite could be considered as a potential adsorbent for chromium ions in aqueous solutions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 255, Issues 1â3, 31 May 2010, Pages 61-66
Journal: Desalination - Volume 255, Issues 1â3, 31 May 2010, Pages 61-66
نویسندگان
Runhu Zhang, Bo Wang, Hongzhu Ma,