Pyrolysis of N-doped organic aerogels with relation to sorption properties |
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Authors: | Petra Veselá Václav Slovák |
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Institution: | (1) Department of Chemistry, Faculty of Science, University of Ostrava, 30. dubna 22, 701 03 Ostrava, Czech Republic |
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Abstract: | Resorcinol–formaldehyde aerogels (five samples, three of them with addition of nitrogen containing precursors—3-hydroxypyridine,
3-aminophenol and melamine) have been prepared by sol–gel polycondensation, subcritical drying and pyrolysis. The pyrolysis
of prepared organic aerogels has been studied by non-isothermal TG at constant heating rate. The process of pyrolysis has
been found to consist of three steps with the total mass loss 40.2–61.7% (room temperature—1,000 °C). The resulted carbon
aerogels have been tested as sorbents of Ni(II), Pb(II) and Cu(II) ions from aqueous solutions. Various relations have been
found among the results obtained from the pyrolysis experiments and properties affecting adsorption. Besides the expected
correlation between the mass loss gained from TG (isothermal step at 500 °C was applied) and from heating in the laboratory
oven, the relationship between the mass loss during pyrolysis and sorption capacities for all three metal ions has been found.
Other relations among pyrolysis behaviour, surface area and content of nitrogen have been also examined. Batch adsorption
experiments show (with an exception of one sample) that N-doped samples have higher adsorption capacity for metal ions. In
addition, changing of nitrogen functionalities during the pyrolysis has been considered and pyridinic-N (N-6) functionality
has been contemplated as a suitable structure for the adsorption process. |
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