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Reducing copper leaching from treated wood by sol-gel derived TiO2 and SiO2 depositions
The antileaching efficacy of sol-gel-derived TiO2- and SiO2-based precursors has been evaluated through laboratory leaching trials with pine sapwood in two different ways. In a one-step process, wood was vacuum impregnated by the precursor solutions containing CuCl2. The copper (Cu) emission rates of the sol-gel-based impregnated woods were up to 70% lower than that of wood treated with pure CuCl2 solution at the same level of concentration. More improvement (80%) could be achieved in a two-step process, in which sol-gel precursors were introduced into an already CuCl2-treated wood. The refinement was attributed to several effects. In the one-step approach, Cu was embedded in the TiO2/SiO2 gels formed in the wood texture. During a two-step impregnation, gel layers that were formed in the wooden interior acted as an effective diffusion barrier. The sol-gel impregnations made wood more hydrophobic; therefore, the low amount of water that penetrated the cell wall was less efficient to leach out Cu.
Reducing copper leaching from treated wood by sol-gel derived TiO2 and SiO2 depositions
The antileaching efficacy of sol-gel-derived TiO2- and SiO2-based precursors has been evaluated through laboratory leaching trials with pine sapwood in two different ways. In a one-step process, wood was vacuum impregnated by the precursor solutions containing CuCl2. The copper (Cu) emission rates of the sol-gel-based impregnated woods were up to 70% lower than that of wood treated with pure CuCl2 solution at the same level of concentration. More improvement (80%) could be achieved in a two-step process, in which sol-gel precursors were introduced into an already CuCl2-treated wood. The refinement was attributed to several effects. In the one-step approach, Cu was embedded in the TiO2/SiO2 gels formed in the wood texture. During a two-step impregnation, gel layers that were formed in the wooden interior acted as an effective diffusion barrier. The sol-gel impregnations made wood more hydrophobic; therefore, the low amount of water that penetrated the cell wall was less efficient to leach out Cu.
Reducing copper leaching from treated wood by sol-gel derived TiO2 and SiO2 depositions
Mahr, Muhammad Shabir (author) / Hübert, Thomas (author) / Stephan, Ina (author) / Bücker, Michael (author) / Militz, Holger (author)
Holzforschung ; 67 ; 429-435
2013
7 Seiten, 33 Quellen
Article (Journal)
English
Holzimprägnierung , Sol-Gel-Methode , Kupfer , Imprägnierung , Zellwand , Titan-IV-oxid , Vakuum , Diffusionsbarriere , Precursor , SiO2 , Holz
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