Enhancement of CO2 Adsorption on Activated Carbon
Prepared from Canarium ovatum Engl. Nut Shells
Marina G. Yao1,ж, Josie L. Pondevidaж, Chi-Feng Cheng§, and Drexel H. Camacho1,*
1Chemistry Department and Center for Natural Science and Ecological Research,
De La Salle University, 2401 Taft Avenue, 1004 Manila, Philippines
§Department of Chemistry and Center for Nanotechnology,
Chung Yuan Christian University, Chung-Li 320, Taiwan, R.O.C.
жIndustrial Technology Development Institute
Department of Science & Technology, Taguig City, Philippines
New sources of activated carbon (AC) are desired for CO2 capture. This study explored the potential of Philippine indigenous Pili tree (Canarium ovatum Engl.) waste nut shell as a source of new activated carbon. The charred sample has high fixed carbon content (86.81%), which upon activation, showed higher surface area (701 m2/g) and larger pore volume (0.45 cm3/g) compared to the unactivated sample. Modification of the carbon surface through impregnation of different amines resulted in lower surface areas, narrower pore volumes, and changes in morphology (from uniform geometric shape to spongy microstructures). The amine modified samples gave slight decrease in X-ray diffraction interlayer spacing (d(002)) resulting in formation of micro crystallites that may promote CO2 adsorption. Indeed, the modified AC samples had higher adsorption capacities for CO2 than the original AC. The amount of adsorbed CO2 on pentaethylenehexamine-modified AC was up to 2.380 mmol/g at 1 atm and 293 K, a 173% increase in comparison with that of the original AC.
The world is in search for technologies designed to reduce greenhouse gas emissions. Among the greenhouse gases, the gradual increase in the atmospheric concentration of carbon dioxide (CO2) due to burning of fossil fuel is very alarming (Boden et al. 2012). The most realistic short term technology, albeit a costly process, on the capture and sequestration of post-combustion CO2 is achieved by amine scrubbing of industrial flue gases (Rao & Rubin 2002). Several technologies for post-combustion CO2 capture (Figueroa et al. 2008) such as liquid solvent absorption (Chaffee et al. 2007), cryogenic techniques . . . . . read more
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