کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1419594 986051 2005 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrophobisation of active carbon surface and effect on the adsorption of water
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
پیش نمایش صفحه اول مقاله
Hydrophobisation of active carbon surface and effect on the adsorption of water
چکیده انگلیسی

A technique of surface hydrophobisation has been applied to two microporous carbonaceous adsorbents. A granular active carbon and an activated carbon fibre, both formerly chemically treated in order they preferentially present hydroxyl surface functions, were modified by action of vinyltrimethoxysilane (vtmos) in liquid phase. The resulting samples were characterised using sorption of nitrogen, FTIR, XPS and 29Si MAS-NMR spectroscopy, and elemental analysis. Their stability and heat treatment have also been investigated through thermal analysis.The efficiency of the hydrophobisation treatment was evaluated by static adsorption of water vapour and vapours of chlorinated volatile organic compounds (VOCs): dichloromethane and trichloroethylene. Grafting of the vtmos and development of a “coating” of polysiloxane onto the adsorbent induced a modification of the carbon surface but also a partial filling of the porosity. These modifications accounted for a decrease of both the amounts of water and VOC adsorbed by the hydrophobised materials. However, water uptakes were found to be much lower than those of the VOCs, evidencing an enhanced selectivity of the hydrophobised adsorbents toward VOCs.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 43, Issue 12, October 2005, Pages 2554–2563
نویسندگان
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