Sonochemical Degradation of Reactive Black 5 with a Composite Catalyst of TiO

概要

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In the sonocatalytic process, composites of TiO<inf>2</inf>-carbon were used because carbon provides more adsorption sites and acts like an electron sink to prevent the recombination of an electron/hole. Therefore, in the present study, the characteristics of a TiO<inf>2</inf>/single-walled carbon nanotubes catalyst (TiO<inf>2</inf>/SWCNTs) have been investigated, and the optimal weight ratio of SWCNTs and the dose for degradation of reactive black 5 (RB5) were also evaluated. TiO<inf>2</inf>/SWCNT composite was characterized using Brunauer--Emmett--Teller analysis, scanning electron microscopy, energy-dispersive X-ray diffraction microanalysis and spectra, and X-ray diffraction patterns. The degradation rate constants of RB5 with the ratio of SWCNTs were found to depend on the adsorption phenomenon of a surface catalyst, light absorbance, and the recombination of electrons and holes. As a result, the optimal ratio of carbon in the sono-TiO<inf>2</inf>/SWCNTs process for degradation of RB5 was \text{TiO_{2}}:\text{SWCNTs}= 200:1. Additionally, the optimal dose of the catalyst was 0.5 g/L.
2013-07-25