Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 179, Issue 1-3, Pages 790-794Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2010.03.073
Keywords
Dichloromethane; Trichloromethane; Activated carbon; Metal ions; Interaction; Desorption activation energy; HSAB concept
Categories
Funding
- National Natural Science Foundation of China [20936001, 20606012]
- Natural Science Foundation of Guangdong Province
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The effects of loading Fe(3+), Mg(2+), Cu(2+) or Ag(+) on activated carbons (ACs) on interaction of the carbon surfaces with dichloromethane (DCM) and trichloromethane (TCM) were investigated. Temperature-programmed desorption (TPD) experiments were conducted to measure the desorption activation energy of DCM/TCM on the ACs separately doped with ions Fe(3+), Mg(2+), Cu(2+) and Ag(+). The absolute hardness and electronegativity of DCM and TCM were estimated on the basis of density functional theory. The influence of loading the metal ions on the ACs on the interaction of its surfaces with DCM/TCM was discussed. Results showed that the desorption activation energy of DCM and TCM on the modified ACs followed the order: Fe(III)/AC>Mg(II)/AC>Cu(II)/AC>AC>Ag(I)/AC. Both DCM and TCM were hard base. The loading of ion Fe(3+) or Mg(2+) on the surface of the ACs enhanced the interaction between DCM/TCM and the surfaces due to Fe(3+) and Mg(2+) being hard acid, while the loading of ion Ag(+) on the surface of the AC weakened the interaction between DCM/TCM and the carbon surfaces due to Ag(+) being soft acid. (C) 2010 Elsevier B.V. All rights reserved.
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