Utilization of Sn/Nb2O5 composite for the removal of methylene blue

Abstract

Recebido em 25/1/09; aceito em 2/10/09; publicado na web em 24/2/10In this work, the oxidation of methylene blue textile dye in the presence of hydrogen peroxide, using niobium oxide impregnated with different proportions of tin (1, 5 and 10% in mass) as catalyst was studied. The materials were characterized by TPR, XPS, XRD and FTIR. The oxidation tests monitored by ESI-MS showed that the composite containing the higher amount of tin was the most efficient in the removal of the dye. The XRD, XPS, and TPR data presented evidence of the formation of the tin-niobium oxide composite containing Sn 0 and supported SnO 2 .

Influence of niobium on carbon nanofibres based Cu/ZrO 2 catalysts for liquid phase hydrogenation of CO 2 to methanol

“…TPR peak at the same magnitude of temperature was also recorded by Courtois et al and attributed to reduction of bulk CuO [29]. Reduction of Nb 2 O 5 is generally reported in the temperature range of 800-900 • C in the literature [30][31][32]. Therefore in the current study, all the reduction peaks attribute to the CuO reduction.…”

Optical Properties of Cu_0.95Pt_0.05Fe_0.97Sn_0.03O₂ for <i>p</i>-Type Transparent Conducting Oxide Materials

“…The peaks display that the binding energies of the Sn3d 3/2 and Sn3d 5/2 signals stay 494.2 eV and 485.8eV, respectively. The XPS peaks confirm that the oxidation state for Sn ions of Cu 0.95 Pt 0.05 Fe 0.97 Sn 0.03 O 2 sample stably exists in Sn2+ state as corresponding to the articles of Li[10] and Cantão[11] whcih have reported the Sn3d 3/2 at 494.8 eV and the Sn3d 5/2 at 485.8 eV for Sn 2+ ion state.…”

Modulating the Surface Properties of Lithium Niobate Nanoparticles by Multifunctional Coatings Using Water-in-Oil Microemulsions

“…Fourier transform infrared spectroscopy (FTIR) was used to assess the efficiency of the coating method and to confirm the presence of the silica layer, as well as COOH or N 3 moieties at the NP surface ( Figure 1 ). All spectra were normalized with respect to the O-Nb-O asymmetric and symmetric bands (720 and 650 cm −1 , respectively) [ 68 , 69 , 70 ]. LNO@COOH NPs presented peaks related to the linear stretching of the O-Si-O bond at 1080 cm −1 and a band characteristic of the Si-CH 2 symmetric bending at 1200 cm −1 , indicating the formation of the silica coating layer.…”