Kinetic modelling of wet peroxide oxidation with N-doped carbon nanotubes
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Carbon nanotubes (CNT) were tested as catalysts in the
removal of 2-nitrophenol (2-NP) by catalytic wet peroxide
oxidation (CWPO). The CNT materials were synthesized by
catalytic chemical vapour deposition in a fluidized-bed reactor,
as described elsewhere [1,2]. In order to synthesize a CNT with
different characteristics, ethylene and acetylene were feeding as
follows: 1) ethylene for 30 min (resulting in catalyst E30); 2)
acetonitrile for 20 min, followed by ethylene for 20 min
(A20E20); 3) acetonitrile for 20 min, followed by ethylene for
10 min (A20E10); 4) ethylene for 10 min, followed by
acetonitrile for 20 min (E10A20); or 5) acetonitrile alone for 30
min (A30). These CNT were tested in CWPO adopting the
experimental procedures reported in our previous studies [2-3]
and at the following operating conditions: 50 ºC, pH0 = 3.0, 0.25
g L-1 of catalyst, 0.5 g L-1 2-NP and 1.78 g L-1 of added hydrogen
peroxide (H2O2). Power-law kinetic equations were fitted to
experimental data, following a similar statistical regression
described elsewhere [4]. Results are depicted in Figure 1.
