کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
143885 438915 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation of carbon aerogel microspheres by a simple-injection emulsification method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Preparation of carbon aerogel microspheres by a simple-injection emulsification method
چکیده انگلیسی


• Monodisperse carbon aerogel microspheres were successfully prepared using a simple-injection emulsification method.
• Perfectly spherical shape of carbon aerogel microspheres was obtained.
• Porous properties and mean diameter of carbon aerogel microspheres can be controlled by adjusting the processing conditions.
• The prepared carbon aerogel microspheres have a potential to be used as an adsorbent for removal of phenol.

Carbon aerogel microspheres were successfully prepared using a simple-injection emulsification method, employing sol–gel polycondensation of a resorcinol–formaldehyde solution containing sodium carbonate as a catalyst. This process was followed by solvent exchange using acetone, supercritical drying with carbon dioxide and carbonization in a nitrogen atmosphere. The effect of curing time before starting injection, injection rate and agitation rate of continuous phase on the particle size and the porous properties of the carbon aerogel microspheres was investigated. Adsorption of phenol by using the prepared carbon aerogel microspheres was also examined. The diameter of carbon aerogel microspheres was controlled in the range of 20–55 μm by varying injection rate and agitation rate. The mean diameter of carbon aerogel microspheres decreased with increasing the injection rate and the agitation rate, whereas their mean diameter was independent of the curing time. The BET surface area and total pore volume of carbon aerogel microspheres increased with increasing the curing time. In contrast, their BET surface area and total pore volume decreased with increasing the injection rate and the agitation rate. The BET surface area, total pore volume, mesopore volume and micropore volume of the carbon aerogel microspheres with a mean diameter of 45 μm were 903 m2/g, 0.60 cm3/g, 0.31 cm3/g and 0.27 cm3/g, respectively. The phenol-adsorption capacity of these carbon aerogel microspheres was 29.3 mg phenol/g adsorbent.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advanced Powder Technology - Volume 24, Issue 5, September 2013, Pages 891–896
نویسندگان
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