کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4572054 1332146 2010 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Adsorption of chromium(VI) ions on Brazilian smectite: Effect of contact time, pH, concentration, and calorimetric investigation
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Adsorption of chromium(VI) ions on Brazilian smectite: Effect of contact time, pH, concentration, and calorimetric investigation
چکیده انگلیسی

The original smectite clay mineral has been collected from Amazon region, Brazil. The compound 2-aminomethylpyridine (AMP) was anchored onto Amazon smectite surface by heterogeneous route. The natural (SMC) and modified (SMCAMP) smectite samples were characterized by elemental analysis, scanning electron microscopy, N2 adsorption, X-ray diffraction, and silicon-29 and carbon-13 nuclear magnetic resonance. Due to the increment of basic centers attached to the pendant chains, the metal adsorption capability of the final chelating material, was found to be higher than the precursor. The ability of these materials to remove Cr(VI) from aqueous solution was followed by a series of adsorption isotherms at room temperature and pH 4.0. The maximum number of moles adsorbed was determined to be 1.16 and 1.87 mmol g− 1 for SMC and SMCAMP, respectively. In order to evaluate the clay samples as adsorbents in dynamic system, a glass column was fulfilled with clay samples (1.0 g) and it was fed with 2.0 × 10− 4 mol dm− 3 Cr(VI) at pH 4.0. The energetic effects caused by metal cation adsorption were determined through calorimetric titrations. Thermodynamics indicated the existence of favorable conditions for such Cr(VI)–nitrogen interactions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: CATENA - Volume 82, Issue 1, 15 July 2010, Pages 35–44
نویسندگان
, , , , ,