Interaction of Copper-Containing Preservatives with Wood. Part 1. Mechanism of the Interaction of Copper with Cellulose
Interaction of Copper-Containing Preservatives with Wood. Part 1. Mechanism of the Interaction of Copper with Cellulose
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DOI：
10.1515/hf.2001.003
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发表时间：
2001-12
期刊：
影响因子：
--
通讯作者：
N. Druz;I. Andersone;B. Andersons
中科院分区：
文献类型：
--
作者：
N. Druz;I. Andersone;B. Andersons
摘要本工作通过电子自旋共振（ESR）、X射线光电子能谱（XPS）和能量色散X射线分析（EDXA）方法研究了不同pH值水溶液中纤维素吸收的铜离子的状态。研究表明，弱酸吸附剂的铜吸附曲线具有S形特征。在 ESR 光谱中的所有 pH 值下，都会记录到各向异性 Cu(II) 信号。当 pH > 4 时，ESR 光谱的各向异性降低。在 pH = 10 时，形成通过交换相互作用和抗磁性簇连接的复合物。样本浸出后，ESR 信号几乎消失。纤维素中铜含量的降低与光谱积分强度的变化不相关。浸出后含铜纤维素 ESR 光谱的变化可以通过 Cu(II) 抗磁性簇的形成来解释。
Summary In the present work, the state of the copper ions absorbed by cellulose from aqueous solutions with different pH values has been studied by electron spin resonance (ESR), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray analysis (EDXA) methods. It has been shown that the curve of copper sorption has a S-like shape characteristic for weak acid sorbents. At all pH values in ESR-spectra, an anisotropic Cu(II)-signal is registered. At pH > 4, the anisotropy of ESR-spectra decreases. At pH = 10, complexes connected by exchange interactions and diamagnetic clusters are formed. After the leaching of specimens, the ESR-signal practically disappeared. The decrease of the copper content in cellulose did not correlate with the change of the integral intensity of the spectra. The changes in ESR-spectra of copper-containing cellulose after leaching were explained by the formation of the Cu(II) diamagnetic clusters.