A composite material in the form of disk with a diameter of 40 mm was fabricated by mixing colloidal stable aqueous suspensions of alumina nanofibers (ANF) and detonation synthesized modified nanodiamonds (MND) at a 5:1 weight ratio of components followed by incubating at 32 °C and vacuum filtrating the mixture. It is assumed that the interaction of ANF and MND occurs due to the difference in their zeta-potentials which provides electrostatic attraction and binding of nanomaterials. Measurements showed that in aqueous suspensions MND have a negative zeta potential of -46.5 mV, while ANF is positive, 44 mV. Scanning and transmission electron microscopy data showed that the composite has a network structure in which clusters of nanodiamonds are distributed over the ANF surface. The results of low-temperature nitrogen adsorption experiments showed that in the network structure of the obtained ANF-MND composite an increase in pore size and specific surface area is observed compared with the control material from ANF. It was found that MND incorporated into the composite exhibit a catalytic function and ensure the formation of a colored product in the co-oxidation reaction of phenol and 4-aminoantipyrine in the presence of Н2О2. In model experiments the applicability of the ANF-MND composite for the multiple detection of phenol in an aqueous medium is shown.
nanodiamonds, aluminum oxide nanofibers, composite, catalyst, indicator system, phenol
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