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Advisor(s)
Abstract(s)
Catalytic wet peroxide oxidation (CWPO) uses H2O2 as a
source of hydroxyl radicals (HO) for the oxidation of organic
species. This process is regarded as a potential solution for the
treatment of aqueous effluents containing recalcitrant and toxic
organic pollutants, difficult to remove by conventional
biological processes, mainly if present at high concentrations (1-
10 g L-1) [1]. In a recent study, three magnetic carbon nanotube
(CNT) samples, named A30 (N-doped), E30 (undoped) and
E10A20 (partially N-doped), were synthesized by chemical
vapor deposition and tested in the CWPO process [2]. It was
revealed that N-doped hydrophilic surfaces promoted a fast
decomposition of H2O2 into non-reactive species (H2O and O2),
limiting the CWPO performance.
In the present study, the surface of the CNTs was modified
by introducing oxygenated surface groups (oxidation with
HNO3, samples CNT-N), and by heat treatment at 800 °C for the
removal of surface functionalities (samples CNT-HT). The
effect of these modifications was analysed during 24-hours-
CWPO-experiments of highly concentrated 4-nitrophenol
solutions (4-NP, 5 g L-1), at atmospheric pressure and 50 °C,
adjusting the initial pH to 3, using a catalyst load of 2.5 g L-1 and
the stoichiometric amount of H2O2 needed for the complete
mineralization of 4-NP. Given the magnetic properties of the Fe
nanoparticles encapsulated inside the CNTs (formed during the
CVD synthesis), catalyst separation
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Pedagogical Context
Citation
Martin-Martinez, Maria; Machado, Bruno; Serp, Philippe; Morales-Torres, Sergio; Silva, Adrián; Figueiredo, Jose Luis; Faria, Joaquim; Gomes, Helder (2018). Catalytic wet peroxide oxidation with modified carbon nanotubes. In CarboCat VIII - 8th International Symposium on Carbon for Catalysis. Porto. ISBN 978-989-8124-22-7