کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1056873 1485315 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Batch and dynamic sorption of Ni(II) ions by activated carbon based on a native lignocellulosic precursor
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
Batch and dynamic sorption of Ni(II) ions by activated carbon based on a native lignocellulosic precursor
چکیده انگلیسی

Vinal-derived Activated Carbon (VAC) developed by phosphoric acid activation of sawdust from Prosopis ruscifolia native wood was tested for the adsorption of Ni(II) ions from dilute solutions in both batch and dynamic modes, comparing it with a Commercial Activated Carbon (CAC). Batch experiments were performed to determine adsorption kinetics and equilibrium isotherms for both carbons. It was possible to remove near 6.55 mg Ni g−1 VAC and 7.65 mg Ni g−1 CAC after 5 h and 10 h contact time, respectively. A pseudo second order equation fitted well with the kinetics of the process, and Langmuir adsorption model was used to adjust the experimental results concerning the adsorption isotherm. The parameters obtained indicate a stronger interaction between sorbent and sorbate for VAC (K = 26.56 L mmol−1) than for CAC (K = 19.54 L mmol−1). Continuous experiments were performed in a fixed-bed column packed with the investigated carbons, evaluating the influence of operational parameters such as flow rate, bed height and feed concentration on the breakthrough curves obtained. The breakthrough occurred more slowly for low concentrations of the metal ion in the feed, low flow rates and high bed height. The breakthrough curves were properly represented by Hall's model for both carbon types. Regeneration of the vinal activated carbon in column was tested, obtaining the same breakthrough curve in a new cycle of use. Finally, vinal-derived activated carbon can effectively be used to treat wastewater having until 30 ppm Ni(II).


► Vinal and commercial activated carbons were tested for adsorption of Ni(II) ions.
► In batch mode, both carbons present similar performance.
► In dynamic mode, vinal activated carbon showed a better performance.
► Vinal activated carbon can be used to treat wastewater having until 30 ppm Ni(II).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Management - Volume 97, 30 April 2012, Pages 109–115
نویسندگان
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