کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
222005 464268 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluating the use of activated carbon felts to remove Co2+, Ni2+ and Sr2+ from wastewater
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Evaluating the use of activated carbon felts to remove Co2+, Ni2+ and Sr2+ from wastewater
چکیده انگلیسی


• ACF metal affinity cannot be determined using only on single element sorption experiments.
• Single metal sorbed quantities on ACF vary as Ni2+ ≈ Co2+ > Sr2+.
• Batch competitive sorption of Ni2+, Co2+ and Sr2+ can be described by the SRS model.
• Metal competition sorbed quantities on ACF vary as Ni2+ ≈ Co2+ > Sr2+.
• Contrary to Ni2+, overshoot of Sr2+ and Co2+ concentrations is observed on column experiments.

As a result of numerous advantages such as high surface areas, rapid sorption rates and low hydrodynamic resistances, activated carbon felts (ACF) are interesting materials for applications in wastewater treatment. This paper studies the use of a polyacrylic acid grafted and a non grafted ACF in the sorption of Co2+, Ni2+ and Sr2+ from a synthetic solution (high NaNO3 concentration) representing a nuclear wastewater. Scanning electron microscopy and surface area analysis were employed to physically characterize both materials. Experimental results for the sorption of ternary mixtures allowed us to uncover a selectivity among the three cations that could not be deducted directly from the sorption isotherms of individual cations. In all cases, differences in the sorption capacity could be related to the electronegativity of the metal cations. Complementarily, removal of Co2+, Ni2+ and Sr2+ by a fixed bed column containing non grafted ACF was studied by means of monoelement and ternary sorption experiments. Only breakthrough curves of individual metals could be fitted by the Thomas model. Overshot of Sr2+ and Co2+ was observed on ternary sorption experiments. The set of results obtained indicate that ACF can potentially be employed in the treatment of nuclear effluents where a selective separation of Sr2+ from Ni2+ and Co2+ is required.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Chemical Engineering - Volume 2, Issue 3, September 2014, Pages 1705–1712
نویسندگان
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