SENSOR COMPOSITE γ-Al2O3 NANOFIBERS / NANODIAMONDS / Cu2+ WITH ENHANCED CATALYTIC ACTIVITY FOR DETECTION OF PHENOLS IN AQUEOUS MEDIUM
Author:
Ronzhin N.1, Posokhina E.1, Mikhlina E.1, Ryzhkov I.12, Bondar V.1
Affiliation:
1. FRC KSC SB RAS 2. Siberian Federal University
Abstract
A functionalized composite γ-Al2O3 nanofibers / nanodiamond / Cu2+ with improved sensor properties for the detection of phenols in an aqueous medium was obtained by chemical modification with copper ions of a new composite material based on alumina nanofibers and nanodiamonds. The chemical modification of the composite made it possible to increase its catalytic activity more than twice in the co-oxidation of phenols with 4-aminoantipyrine in the presence of H2O2. The obtained effect enabled to reduce the threshold of the minimum detectable concentration of analytes by half when they were tested using a functionalized composite. What was demonstrated by the example of the detection of phenol and 4-chlorophenol. It was shown that the obtained composite provides a linear response in a wide range of concentrations of phenol (0.25–100 μM) and 4-chlorophenol (0.5–25 μM). It is found that the adsorbed Cu2+ ions are firmly bound to composite surface, are not desorbed, and are not inactivated by co-oxidation reagents during repeated use of the composite. The applicability of a functionalized composite as a reusable sensor was shown in model experiments in the course of sequential multiple testing of phenol in aqueous samples. Comparative studies of the kinetics and isotherms of adsorption of Cu2+ ions on a composite material and an alumina matrix, and estimation their sorption capacity were also carried out in the work.
Publisher
RIOR Publishing Center
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