In: Journal of the Chemical Society, Faraday Transactions, 1997, vol. 93, no. 15, p. 2211-2215
A typical activated carbon, derived from olive stones, has been oxidized to different degrees with (NH4)2S2O8 and analysed by water vapour adsorption, immersion calorimetry, acid–base titration and temperature-programmed desorption of CO2 and CO monitored by mass spectrometry. These techniques led to a coherent description of the surfaces...
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In: Carbon, 1999, vol. 37, no. 8, p. 1215-1221
Active carbons of different origins have been oxidized with H2O2 and (NH4)2S2O8 and their oxygen surface complexes have been characterized by TPD, classical titration following Boehm's method and by neutralization calorimetry. The net enthalpies of neutralization, determined by immersion calorimetry into NaOH and HCl 2 N lead to...
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In: Langmuir, 2000, vol. 16, no. 14, p. 5967–5972
The interaction of methanol and ethanol with active carbons of different origins and containing between 0.81 and 7 mmol g-1 surface oxygen has been examined by immersion calorimetry and by vapor adsorption at 293 K, benzene being the reference. The results obtained by these independent techniques are in excellent agreement. With respect to pure carbons, the surface oxygen leads to...
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In: Langmuir, 2001, vol. 17, no. 11, p. 3301–3306
It is shown that the adsorption of phenol and 3-chlorophenol from aqueous solutions, by basic active carbons and at an equilibrium solution pH below that of dissociation of the phenols, can be described by an equation of the DRK type with exponent n = 4. The principle of temperature invariance is fulfilled between 283 and 313 K, which means that predictions can be made on the basis of a...
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