Copper precipitation of Cu-monoethanolamine preservative in wood
-
Myung Jae Lee
and
Paul Cooper
Abstract
Copper precipitation is one of the important Cu fixation mechanisms of Cu-amine-treated wood. In the present work, possible pathways of Cu precipitation have been investigated via in vitro and in situ studies focusing on effects of pH and temperature and Cu species formed in Cu-monoethanolamine (Cu-Mea)-treated wood. Higher-concentration Cu-Mea solutions required a lower pH and higher amounts of acid for the precipitation because of the higher amount of free Mea in the preservative-wood system. For this reason, Cu fixation during wet conditioning of wood treated to high Cu retention (2.0% treating solution) resulted in only a slight pH decrease and low Cu fixation. When lower-concentration solutions (0.67% and 0.2%) were applied, the pH decreased enough for Cu precipitation, and the much higher Cu fixation rate was driven by both chemisorption and precipitation. Evaluation of leaching after wet conditioning and drying showed that additional Cu precipitation could occur during drying. Wet conditioning of Cu-Mea-treated wood at 50°C showed outwardly faster and higher Cu fixation, but resulted in higher Cu leaching. According to X-ray diffraction analysis, the in vitro precipitated Cu was a mixture of azurite and malachite, and possibly, Cu2O formed as a result of Cu-Mea decomposition.
©2012 by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
- Masthead
- Original Papers
- Proposed supramolecular structure of lignin in softwood tracheid compound middle lamella regions
- Degradation products of lignocellulosics in pulp mill effluents – comparison and evaluation of different gas chromatographic techniques for a comprehensive analysis
- Analysis of DCM extractable components from hot-pressed hybrid poplar
- Pretreatment of softwood dissolving pulp with ionic liquids
- Probing the chemical and surface chemical modification of vessel cell walls during bleaching of eucalyptus pulp
- Chemotaxonomical identification of Holocenic bogwood recovered after 2007 Niigataken Chuestsu-oki Earthquake
- Tensile creep and recovery of Norway spruce influenced by temperature and moisture
- Solvent-free chemical modification of wood by acetic and butyric anhydride with iodine as catalyst
- Synchrotron-based tomographic microscopy (SbTM) of wood: development of a testing device and observation of plastic deformation of uniaxially compressed Norway spruce samples
- Effects of polymeric matrix on accelerated UV weathering properties of wood-plastic composites
- Nano- and microstructures in stretched and non-stretched blend gels of cellulose and hemicelluloses
- Dimensional and hygroexpansive behaviors of cellulose microfibrils (MFs) from kraft pulp-based fibers as a function of relative humidity
- Effect of quat- and amino-silicones on fungal colonisation and decay of wood
- Copper precipitation of Cu-monoethanolamine preservative in wood
- Short Note
- Mode II critical stress intensity factor of wood measured by the asymmetric four-point bending test of single-edge-notched specimen while considering an additional crack length
- Erratum
- Treating birch wood with a switchable 1,8-diazabicyclo-[5.4.0]-undec-7-ene-glycerol carbonate ionic liquid
- Meetings
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