A novel magnetically recoverable, visible light active TiO-WO composite (FeO@SiO@TiO-WO) was prepared to enable the photocatalyst recovery after the degradation of bisphenol A (BPA) under simulated solar light. For comparison, the photocatalytic activity of other materials such as non-magnetic TiO-WO, FeO@SiO@TiO, TiO, and the commercial TiO P25 was also evaluated under the studied experimental conditions. The structure and morphology of the synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), and electron dispersion spectroscopy (EDS). Moreover, Brunauer-Emmett-Teller (BET) surface area and magnetic properties of the samples were determined. The FeO@SiO@TiO-WO and TiO-WO led to a BPA degradation of 17.50 and 27.92 %, respectively, after 2 h of the simulated solar light irradiation. Even though their activity was lower than that of P25, which degraded completely BPA after 1 h, our catalysts were magnetically separable for their further reuse in the treatment. Furthermore, the influence of the water matrix in the photocatalytic activity of the samples was studied in municipal wastewater. Finally, the identification of reaction intermediates was performed and a possible BPA degradation pathway was proposed to provide a better understanding of the degradation process. Graphical abstract ᅟ.
The voltammetric behavior of 4-methyl-N-8-quinolinybentenesulfonamide, closely related to the active component of the commercial extractant LM 34, has been studied in 0.1 M KC1/2j% methanol medium as a function of pH, using polarography and cyclic voltammetry techniques. The electrochemical behavior of the extractant in the presence of Cu (11) ions has also been described. The commercial LLX 34 product exhibits a similar behavior both in differential pulse polarography and cyclic voltammetry, and polarographic determination methods have been developed for both reagents. The relationship between reduction peak current and concentration is linear up to 1.96 X M for 4-methyl-N-8-quinolinylbenzenesulfonamide, and the corresponding function for LIX 34 indicates a low percentage of the active component in the commercial extractant.
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