کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
580788 | 1453156 | 2009 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Adsorption of acids and bases from aqueous solutions onto silicon dioxide particles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
The adsorption of acids and bases onto the surface of silicon dioxide (SiO2) particles was systematically studied as a function of several variables, including activation conditions, contact time, specific surface area, particle size, concentration and temperature. The physical properties of SiO2 particles were investigated, where characterizations were carried out by FT-IR spectroscopy, and morphology was examined by scanning electron microscopy (SEM). The SEM of samples showed good dispersion and uniform SiO2 particles with an average diameter of about 1-1.5 μm. The adsorption results revealed that SiO2 surfaces possessed effective interactions with acids and bases, and greatest adsorption capacity was achieved with NaOH, where the best fit isotherm model was the Freundlich adsorption model. The adsorption properties of raw SiO2 particles were further improved by ultrasonication. Langmuir monolayer adsorption capacity of NaOH adsorbate at 25 °C on sonicated SiO2 (182.6 mg/g) was found to be greater than that of the unsonicated SiO2 (154.3 mg/g). The spontaneity of the adsorption process was established by decreases in ÎGads0, which varied from â10.5 to â13.6 kJ molâ1, in the temperature range 283-338 K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 172, Issues 2â3, 30 December 2009, Pages 978-985
Journal: Journal of Hazardous Materials - Volume 172, Issues 2â3, 30 December 2009, Pages 978-985
نویسندگان
Huseyin Zengin, Belgin Erkan,