Study of the multiple modification of cocoanut activated carbon and its adsorption properties of CO2in simulated flue gas - Details

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Abstract：

Porous　cocoanut　activated　carbon　was　modified　using　tree　chemical　methods:　tetraethylenepentamine　(TEPA)　modified　directly　(AC),　firstly　oxidized　by　HNO3solution　(10%)　for　4　h　at　353　K　then　TEPA　modified　(HNO3+TEPA)　and　firstly　alkalified　by　KOH　solution　(5　mol/L)　for　4　h　at　353　K　then　TEPA　modified　(KOH+TEPA).　The　results　show　that　KOH　reduction　on　AC　improved　the　effect　of　the　modification,　HNO3oxidation　on　AC　has　no　significant　effect　on　modification.　The　CO2adsorption　capacity　of　OH-TEPA-AC　measured　using　a　thermogravimetric　analyzer　(TGA)　in　simulated　flue　gas　conditions　(10vol%　CO2,　90vol%　N2)　was　about　1.182　mmol/g　at　303　K,　the　dynamic　adsorption　capacity　was　between　1.192-1.215　and　0.970-1.152　mmol/g　with　or　without　the　presence　of　water　during　ten　cycles　of　adsorption/desorption.　Dynamics　analysis　shows　that　the　average　isosteric　heat　of　adsorption　was　about　-52　kJ/mol,　so　OH-TEPA-AC　was　likely　to　be　satisfactory　in　practical　applications　of　capturing　CO2.　©,　2015,　Journal　of　Functional　Materials.　All　right　reserved.

Keyword：

Activated carbon Adsorption Carbon dioxide Flue gases Nitric acid

Community：

[ 1 ] [Lin, Xiaoying]School of Chemical Engineering, Fuzhou University, Fuzhou, China
[ 2 ] [Lin, Xiaoying]College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou, China
[ 3 ] [Zhang, Huiyun]School of Chemical Engineering, Fuzhou University, Fuzhou, China
[ 4 ] [Liu, Yamin]College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou, China
[ 5 ] [Jiang, Mei]College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou, China
[ 6 ] [Liu, Minghua]College of Environment and Resources, Fuzhou University, Fuzhou, China
[ 7 ] [Bai, Shengjie]College of Environment and Resources, Fuzhou University, Fuzhou, China
[ 8 ] [Lin, Cheng]School of Chemical Engineering, Fuzhou University, Fuzhou, China