کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
582798 | 877859 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sorption properties of the activated carbon-zeolite composite prepared from coal fly ash for Ni2+, Cu2+, Cd2+ and Pb2+
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Composite materials of activated carbon and zeolite have been prepared successfully by activating coal fly ash (CFA) by fusion with NaOH at 750 °C in N2 followed by hydrothermal treatments under various conditions. Uptake experiments for Ni2+, Cu2+, Cd2+ and Pb2+ were performed with the materials thus obtained from CFA. Of the various composite materials, that were obtained by hydrothermal treatment with NaOH solution (ca. 4 M) at 80 °C (a composite of activated carbon and zeolite X/faujasite) proved to be the most suitable for the uptake of toxic metal ions. The relative selectivity of the present sorbents for the various ions was Pb2+ > Cu2+ > Cd2+ > Ni2+, with equilibrium uptake capacities of 2.65, 1.72, 1.44 and 1.20 mmol/g, respectively. The sorption isotherm was a good fit to the Langmuir isotherm and the sorption is thought to progress mainly by ion exchange with Na+. The overall reaction is pseudo-second order with rate constants of 0.14, 0.17, 0.21 and 0.20 L g/mmol min for the uptake of Pb2+, Cu2+, Cd2+ and Ni2+, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 160, Issue 1, 15 December 2008, Pages 148-153
Journal: Journal of Hazardous Materials - Volume 160, Issue 1, 15 December 2008, Pages 148-153
نویسندگان
Vinay Kumar Jha, Motohide Matsuda, Michihiro Miyake,