Preparation and characterization of a novel composite obtained through Zr(IV) isopropoxide and phosphoric acid for L-Glutathione detection

Full text: Composite materials are composed of two or more distinct phases in order to achieve a combination of properties that are not exhibited by any single material, and also to incorporate the best characteristics of each component material phases. Inorganic composites are those in which the matrix is a metallic or ceramic material [1]. In this work we report the preparation and characterization of composite Phosp hated Zirconia (Zr P) from aqueous phosphoric acid and Zirconium (IV) Isopropoxide Isopropanol Complex. Techniques such as, Fourier Transform Infrared Spectroscopy, ³¹P and ¹³C Nuclear Magnetic Resonance, Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy and Cyclic Voltammetry were used for characterization of this composite. Vibrational spectrum for Zr P, it was observed a broad band in the region of 3700 to 3000 cm^-1 which was attributed to symmetrical and asymmetrical -OH stretching, there is also a narrow band in 1632 cm^-1 that was assigned to H-O-H bond of water and a strong absorption at 1010 cm^-1 which was attributed to (P=O) stretching [2]. The results obtained by energy dispersive X-ray spectroscopy confirmed the presence of Zr, P and O in the formed composite, and any C has been detected in concordance of NMR of ¹³C in solid state, this is an indicative of preparation was conducted with success. As an application of new material, Zr P was reacted with silver ions and subsequent addition of potassium hexacyanoferrate (III) (ZrPAgH). The electrochemical behaviour of the ZrPAgH was verified by cyclic voltammetry using of a graphite paste electrode. The modified graphite paste electrode could be used in the electrocatalytic oxidation of L-Glutathione. References: [1] N. Saheb et al., Materials 7, 4148 (2014). [2] R. Thakkar and U. Chudasama, J. Sci. Ind. Res. 68, 312 (2009). (author)