The effects of CO2 activation, on porosity and surface functional groups of cocoa (Theobroma cacao) - Shell based activated carbon

被引：35

作者：

Ahmad, Fisal ^{[1
]}

Daud, Wan Mohd Ashri Wan ^{[2
]}

Ahmad, Mohd Azmier ^{[3
]}

Radzi, Rosinah ^{[1
]}

Azmi, Amirul Azri ^{[1
]}

机构：

[1] Malaysian Cocoa Board, Chem & Technol Div, Nilai 71800, Negeri Sembilan, Malaysia

[2] Univ Malaya, Dept Chem Engn, Kuala Lumpur 50603, Malaysia

[3] Univ Sains Malaysia, Sch Chem Engn, Sps 14300, Pulau Pinang, Malaysia

来源：

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2013年 / 1卷 / 03期

关键词：

Cocoa (Theobroma cacao) shell; Pellet; Char; Activated carbon; Pore development;

D O I：

10.1016/j.jece.2013.06.004

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A series of activated carbon from cocoa shell (CSAC) was prepared from cocoa shell pellet (CS) by carbonization and followed by physical activation using CO2 as the activation agent. Carbonization was done in a flow of N-2 using a fixed-bed reactor at 400, 500, 600, 700, 800 and 900 degrees C with soaking time at the carbonization temperature for an hour. The selected char indicated completion of the aromatization process which suggests no structural changes beyond this temperature. Char monolith, carbonized at 800 degrees C were activated at 850 degrees C using a fixed bed reactor for different burn-offs. The drilling of the pores possibly occurred at burn-off below 60% which indicated by huge increase of absolute pore volume against the burn-off. The surface area at 48.5% burn-off was estimated at 366.26 m(2) g(-1). High burn-off product tends to develop larger micropore and moderate BET surface area. The largest surface area of CSAC was recorded at 558.25 m(2) g(-1). During activation, the aromatization of CSAC increased but the aliphacity decreased accordingly. (C) 2013 Elsevier Ltd All rights reserved.

引用

页码：378 / 388

页数：11

共 61 条

[1]

Ioannidou O., Zabaniotou A., Agricultural residues as precursors for activated carbon production - A review, Renew. Sustain. Energy Rev., 11, 9, pp. 1966-2005, (2007)

[2]

Mohamed A.R., Mohammadi M., Darzi G.N., Preparation of carbon molecular sieve from lignocellulosic biomass: A review, Renew. Sustain. Energy Rev., 14, 6, pp. 1591-1599, (2010)

[3]

Johns M.M., Marshall W.E., Toles C.A., Agricultural by-products as granular activated carbons for adsorbing dissolved metals and organics, J. Chem. Technol. Biotechnol., 71, pp. 131-140, (1998)

[4]

Lopez M., Labady M., Laine J., Preparation of activated carbon from wood monolith, Carbon, 34, pp. 825-827, (1996)

[5]

Malaysian Cocoa Monitor, Malaysian Cocoa Board, (2011)

[6]

Redgwell R., Trovato V., Merinat S., Curti D., Hediger S., Manez A., Dietary fibre in cocoa shell: Characterisation of component polysaccharides, Food Chem., 81, pp. 103-112, (2003)

[7]

Rodriguez-Reinoso F., Rodriguez-Valero M.A., Martinez-Escandell M., Molina-Sabio M., CO<sub>2</sub> activation of olive stones carbonized under pressure, Carbon, 39, pp. 320-323, (2001)

[8]

Nabais J.M.V., Nunes P., Carrotta P.J.M., Manuel M., Ribeiro Carrott L., Macias Garcia A., Diaz-Diez M.A., Activated carbons from coffee endocarp by CO<sub>2</sub> and steam activation, Fuel Process. Technol., 89, 3, pp. 262-268, (2008)

[9]

Rouquerol F., Rouquerol J., Sing K., Adsorption by Powders and Porous Solids, 439, (1999)

[10]

Pendyal B., Johns M.M., Marshall W.E., Ahmedna M., Rao R.M., Removal of sugar colorants by granular activated carbons made from binders and agricultural by-products, Bioresour. Technol., 69, 1, pp. 45-51, (1999)

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