Rate and extent of adsorption of ACQ preservative components in wood
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Dosyalar
Tarih
2005
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Walter De Gruyter & Co
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The adsorption of copper, [as Cu(II)], monoethanolamine (MEA) and didecylclimethyl ammonium chloride (DDAC) components of CuMEA and alkaline copper quaternary (ACQ) solutions impregnated into wood was followed by measuring the changes in solution concentrations in the wood over time. The rate and extent of copper and MEA adsorption were highly dependent on the solution strength and the conditioning temperature. Both copper and MEA were adsorbed by the wood structure with a rapid initial reaction, with higher relative amounts sorbed from lower concentration solutions. This was followed by a slower adsorption that still had not equilibrated after 7 weeks at 22 degrees C. Generally, the adsorption pattern was similar for copper and MEA, suggesting that they were adsorbed as a copper MEA complex, with an MEA/copper molar ratio close to the theoretical maximum of 4. At a higher conditioning temperature of 50 degrees C the reaction time was greatly reduced, with the adsorption after 1 week higher than after 7 weeks at 22 degrees C, suggesting faster and more complete reaction at higher temperatures. DDAC was adsorbed more quickly and to a higher degree than Cu(II) for all treatment solutions and should be preferentially removed from such solutions, especially if empty-cell treatments are used. There appeared to be higher Cu adsorption from the higher concentration solutions of CuMEA than from corresponding ACQ solutions, likely due to DDAC competition with copper for the same reaction sites.
Açıklama
Anahtar Kelimeler
Adsorption, Alkaline Copper Quaternary (ACQ), Didecyldimethyl Ammonium Chloride (DDAC), Fixation, Ion Chromatography, Monoethanolamine, Quaternary Ammonium Compounds, Stabilization, X-ray Fluorescence Spectroscopy
Kaynak
Holzforschung
WoS Q Değeri
Q1
Scopus Q Değeri
Q3
Cilt
59
Sayı
5
