کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
612829 880708 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modification of silica gel by attachment of 2-mercaptobenzimidazole for use in removing Hg(II) from aqueous media: A thermodynamic approach
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Modification of silica gel by attachment of 2-mercaptobenzimidazole for use in removing Hg(II) from aqueous media: A thermodynamic approach
چکیده انگلیسی

The compound 2-mercaptobenzimidazole (MBI) was attached onto a silica gel surface by homogeneous and heterogeneous routes. Both silica modification methodologies resulted in similar products, named SiMhom and SiMhet, respectively. These materials were characterized by surface area, infrared, thermogravimetry, and 13C and 29Si NMR spectroscopy. The ability of these materials to remove divalent mercury from aqueous solution was followed by a series of adsorption isotherms adjusted to a modified Langmuir equation. The maximum number of moles adsorbed was determined to be 1.35±0.31.35±0.3 and 1.42±0.17 mmolg−1 for SiMhet and SiMhomt, respectively. These interactions were calorimetrically followed and the thermodynamic data showed the following exothermic enthalpic values: −23.04±1.4−23.04±1.4 and −20.08±1.2 kJmol−1 for SiMhom and SiMhet, respectively. All liquid/solid interface adsorptions were spontaneous in nature and enthalpically driven.

Hg(II) adsorption on silica modified with 2-mercaptobenzimidazole.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 311, Issue 1, 1 July 2007, Pages 1–7
نویسندگان
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