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|Type:||Artigo de periódico|
|Title:||Deposition of titanium dioxide on Brazilian chrysotile fibres|
|Abstract:||The deposition of TiO2 particles on Brazilian chrysotile fibres from aqueous dispersions was studied as a function of: (i) the amount of particles and fibres present in the system, (ii) the time of contact between the materials, (iii) the temperature and (iv) the ionic strength. Our results show that a large quantity of TiO2 is deposited on chrysotile and that the deposition does not depend on the concentration of the fibres. A steady-state deposition is reached after about 20 minutes of contact between the TiO2 and the chrysotile. In the absence of an inert electrolyte, classical temperature-independent high-affinity isotherms are obtained. The presence of an inert electrolyte yields a large increase in the TiO2 deposition above a threshold concentration of 2.5 g/l TiO2. We found that the TiO2 particles are strongly attached on the ckrysotile fibres. TiO2 supported on chrysotile showed catalytic activity in the photodecomposition of the phenyl group of sodium dodecylbenzene sulphonate. (C) 1997 Elsevier Science S.A.|
|Editor:||Elsevier Science Sa Lausanne|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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