A novel copper(ii) phthalocyanine (CuPc)-modified multiwalled carbon nanotube-based electrode was prepared for the sensitive electrochemical detection of bisphenol A, by the modification of a pencil graphite electrode via the adsorption method.
In this work, Ag doped nano TiO 2 photocatalysts were synthesized in powder form by hydrothermal method at 180 ºC in 120 min. using different reduction agents. The synthesized powders were characterized by powder X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), Surface area measurements (BET), Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analyses. The effect of reduction agents on the morphological properties of Ag doped nano TiO 2 has been studied. We have been observed that the use of different reduction agents affects the particle size and surface area. Ag doped nano TiO 2 photocatalysts were coated to the ceramic pellets by dip coating technique for photocatalytic study. Photocatalytic properties of the synthesized powder were examined in a circulating aquarium filled with indigo blue (IB) solution under UV irradiation. Periodical UV spectrophotometric analysis showed that indigo blue (IB) has been degraded and its concentration has decreased under UV irradiation by time.
In this study, we have focused on the use of a poly(L-cysteine) (PLC) modified pencil graphite electrode (PGE) as a sensor for determination of Sunset Yellow (SY). The performance of the modified electrode was studied using cyclic voltammetric and differential pulse voltammetric method. The modified electrode was characterized by electrochemical impedance spectroscopy, cyclic voltammetry and Fourier transform infrared spectroscopy. The surface of the modified electrode was examined by scanning electron microscope. The electrochemical behavior of SY in phosphate buffer solution (pH 7.0) was examined using unmodified PGE and PLC modified PGE (PLC/PGE). The results showed that the electrochemical response of PLC/PGE to SY was significantly developed. The PLC/PGE showed linear responses in the electrochemical oxidation of SY between the concentration values of 1.0 µM and 1000 µM. The sensor (PLC/PGE) showed a good response for SY with a detection limit of 0.125 µM (S/N=3). Analytical application of PLC/PGE was successfully tested in the determination of SY in food and beverage samples.
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