کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1696233 1519127 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Adsorption of chromate and molybdate by cetylpyridinium bentonite
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Adsorption of chromate and molybdate by cetylpyridinium bentonite
چکیده انگلیسی

Bentonite was modified with cetylpyridinium bromide (CPBr) and investigated by elemental analysis, IR, X-ray diffraction, thermogravimetric analysis, specific surface area (BET) and electrokinetic mobility measurements. The surfactant was adsorbed on the montmorillonite in a bilayer structure. The organo-bentonite removed the oxyanions of Cr(VI) and Mo(VI) from aqueous solutions. The adsorption followed a pseudo-second-order kinetics and adsorption capacities of 0.7 and 1.4 mmol/g for Cr(VI) and Mo(VI) were recorded. Ea = 5.34 and 14.50 kJ/mol for the adsorption of Cr(VI) and Mo(VI) indicated an ion exchange mechanism. The standard free energy values (ΔG°) of − 2.11 and − 3.40 kJ/mol for Cr(VI) and Mo(VI) indicated a spontaneous adsorption process. Column studies showed the suitability of the organo-bentonite for operation in continuous flow systems.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 41, Issues 1–2, September 2008, Pages 73–84
نویسندگان
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