کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
579427 1453141 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Selective sorption of divalent cations using a high capacity sorbent
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Selective sorption of divalent cations using a high capacity sorbent
چکیده انگلیسی
This manuscript describes the application of a novel sorbent, sodium titanate nanotube (STN) on partitioning of various divalent cations. Seven divalent cations, from alkaline earth, transition and post-transition groups, were used to determine the capacity and selectivity of STN. At pH 3 ± 0.02 and 0.1 M ionic strength, STN displayed high capacity for Pb and Cd (1.27 and 0.39 mmol/g, correspondingly). The affinity of divalent cations was in the order Pb ≫  Cd > Cu > Zn > Ca > Sr > Ni. For six of the tested cations, their sorption capacity can be linearly correlated to its hydrolysis constant and electronegativity. STN has unusually low affinity for Ni and correlations of sorption capacity of Ni falls outside the 95% confidence intervals. Furthermore, it exhibited sorption behavior similar to alkaline earth cations, significant uptakes occurred only when pH > point of zero charge. In competitive sorption tests, STN preferentially sorb Cd over other metals (Zn, Ni, Ca and Sr) which coexist in industrial wastewater. As such STN is a potential novel sorbent useful for partitioning Cd from other metals in industrial wastewater.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 187, Issues 1–3, 15 March 2011, Pages 96-100
نویسندگان
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