Abstract
This work describes the use of the mixed oxide SiO2/TiO2/Sb2O5 (STSb) prepared by the sol-gel processing method. The material had an ion exchanger capacity of 2.0 mmol g−1 and was used to absorb a Co(II) methyl-pyridyl-porphyrin complex (CoTmPyP) by an ion exchange reaction. The resulting material, STSb/CoTmPyP, showed a specific surface area of 554 m2 g−1 and 84 μmol g−1 of adsorbed cobalt complex. A carbon paste electrode made with STSb/CoTmPyP showed that, in a cyclic voltammetry experiment, it can electrocatalytically reduce dissolved oxygen in water solution (pH between 3 and 6.8) under a cathodic potential of −170 mV. The electrode showed a linear response for dissolved O2 concentration in water between 1 and 10.1 ppm.
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