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Title: Thermal behaviour of arsenic trioxide adsorbed on activated carbon
Authors: Cuypers, Frederic
DE DOBBELAERE, Christopher
VAN BAEL, Marlies
Helsen, Lieve
Issue Date: 2009
Citation: JOURNAL OF HAZARDOUS MATERIALS, 166(2-3). p. 1238-1243
Abstract: The thermal stability and desorption of arsenic trioxide (As2O3) adsorbed on activated carbon (AC) was investigated as this phenomenon is expected to influence the arsenic release during low temperature pyrolysis of chromated copper arsenate (CCA) wood waste. Firstly, a thermogravimetric (TG) experiment with arsenolite, an allotropic form of As2O3, was performed. The sample starts to sublime at temperatures lower than 200,C with a sublimation peak temperature of 271 degrees C. Subsequently, TG experiments with samples of As2O3 adsorbed on AC revealed that only very little (max. 6 +/- 3 wt%) As2O3 was volatilised at temperatures below 280 degrees C, while still 41.6 (+/- 5)wt% of the original arsenic concentration was retained at 440 degrees C and 28.5 (+/- 3) wt% at 600 degrees C. The major arsenic volatilisation occurred between 300 degrees C and 500 degrees C. The kinetic parameters of desorption, activation energy of desorption (E-d) and pre-exponential factor (A), were determined by fitting an Arrhenius model to the experimental data, resulting in E-d = 69 kJ/mol, A = 1.21 x 10(4) s(-1). It can be concluded that the adsorption of As2O3 on AC can contribute to the thermal stabilisation of As2O3, Consequently, during low temperature pyrolysis of CCA wood arsenic release may be prevented by adsorption of As2O3 on the coal-type product formed during the thermal decomposition of the wood. (C) 2008 Elsevier B.V. All rights reserved.
Notes: [Cuypers, Frederic; Helsen, Lieve] Katholieke Univ Leuven, Dept Mech Engn, Div Appl Mech & Energy Convers, B-3001 Heverlee, Belgium. [De Dobbelaere, Christopher; Hardy, An; Van Bael, Marlies K.] Hasselt Univ, Inst Mat Res, Lab Inorgan & Phys Chem, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/9799
DOI: 10.1016/j.jhazmat.2008.12.048
ISI #: 000266947000094
ISSN: 0304-3894
Category: A1
Type: Journal Contribution
Validation: ecoom, 2010
Appears in Collections: Research publications

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