کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
580541 1453152 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Solid phase extraction of uranium(VI) onto benzoylthiourea-anchored activated carbon
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Solid phase extraction of uranium(VI) onto benzoylthiourea-anchored activated carbon
چکیده انگلیسی
A new solid phase extractant selective for uranium(VI) based on benzoylthiourea anchored to activated carbon was developed via hydroxylation, amidation and reaction with benzoyl isothiocyanate in sequence. Fourier transform infrared spectroscopy and total element analysis proved that benzoylthiourea had been successfully grafted to the surface of the activated carbon, with a loading capacity of 1.2 mmol benzoylthiourea per gram of activated carbon. The parameters that affect the uranium(VI) sorption, such as contact time, solution pH, initial uranium(VI) concentration, adsorbent dose and temperature, have been investigated. Results have been analyzed by Langmuir and Freundlich isotherm; the former was more suitable to describe the sorption process. The maximum sorption capacity (82 mg/g) for uranium(VI) was obtained at experimental conditions. The rate constant for the uranium sorption by the as-synthesized extractant was 0.441 min−1 from the first order rate equation. Thermodynamic parameters (ΔH0 = −46.2 kJ/mol; ΔS0 = −98.0 J/mol K; ΔG0 = −17.5 kJ/mol) showed the adsorption of an exothermic process and spontaneous nature, respectively. Additional studies indicated that the benzoylthiourea-anchored activated carbon (BT-AC) selectively sorbed uranyl ions in the presence of competing ions, Na+, Co2+, Sr2+, Cs+ and La3+.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 176, Issues 1–3, 15 April 2010, Pages 119-124
نویسندگان
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