Sintese e caracterização do compósito TixOy- MWCNT para fotodegradação de carbaril

In this study, a composite of titanium oxide (TixOy) and carbon nanotubes multi-walled (MWCNT) was synthesized on a titanium substrate using the sol-gel method. The electrode obtained (TixOy-MWCNT/Ti) was used to the photodegradation of Carbaryl. The morphology and structure of the TixOy-MWCNT composite were characterized by scanning electron microscopy (SEM), scanning electron microscopy by field emission (FEG-SEM) and X-ray diffraction (XRD). The electrode was evaluated for degradation of Carbaryl (0.9 mmol L-1) in phosphate buffer pH 6, and using chronoamperometry by applying a potential of +1,5 V for 1 h. Using the Ultraviolet-Visible test, the absorbance at 220 nm was collected every 15 min to calculate the percentage of Cabaryl´s degradation. Can be evaluated that the Carbaryl degradation using the TixOy-MWCNT/Ti electrode was 22% more efficient when compared with the electrode without the presence of titanium oxides (MWCNT / Ti)

Towards an understanding on the role of precursor in the synthesis of ZnS nanostructures

Wurtzite-structured ZnS nanostructures have been synthesized by means of a microwave-solvothermal method at 140°C using three precursors (chloride, nitrate and acetate). Different techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR) spectroscopy, ultraviolet–visible (UV–vis) absorption spectroscopy and photoluminescence (PL) measurements have been employed to characterize this material. The structure, surface morphology, chemical composition and optical properties were investigated as function of precursor. In order to complement experimental results, first principles calculations at DFT level were carried out in order to obtain the relative stability of the proposed intermediates along the formation mechanism. - See more at: http://www.eurekaselect.com/117237/article#sthash.GzvnCBTB.dpuf

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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