Rate and extent of adsorption of ACQ preservative components in wood
Rate and extent of adsorption of ACQ preservative components in wood
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DOI：
10.1515/hf.2005.094
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发表时间：
2005-09
期刊：
影响因子：
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通讯作者：
Cihat Taşçioğlu;P. Cooper;T. Ung
中科院分区：
文献类型：
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作者：
Cihat Taşçioğlu;P. Cooper;T. Ung
摘要铜的吸附，[作为Cu（II）]，单乙醇胺（MEA）和二癸基二甲基氯化铵（DDAC）组分的CuMEA和碱性铜季铵（ACQ）溶液浸渍到木材中，然后通过测量溶液浓度随时间的变化在木材中。铜和MEA吸附的速率和程度高度依赖于溶液强度和调节温度。铜和MEA都被吸附的木材结构与快速的初始反应，从较低浓度的溶液中吸附较高的相对量。随后是较慢的吸附，在22°C下7周后仍未平衡。通常，铜和MEA的吸附模式是相似的，这表明它们作为铜MEA络合物被吸附，MEA/铜摩尔比接近理论最大值4。在50°C的较高调节温度下，反应时间大大减少，在22°C下1周后的吸附高于7周后的吸附，表明在较高温度下反应更快和更完全。DDAC吸附更快，更高的程度比铜（II）的所有治疗方案，并应优先从这样的解决方案，特别是如果使用空细胞治疗。从较高浓度的CuMEA溶液中的Cu吸附量似乎高于相应的ACQ溶液，这可能是由于DDAC与铜竞争相同的反应位点。
Abstract The adsorption of copper, [as Cu(II)], monoethanolamine (MEA) and didecyldimethyl 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°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°C the reaction time was greatly reduced, with the adsorption after 1 week higher than after 7 weeks at 22°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.