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The chemistry, morphology, crystal structure and hydrophilicity properties of wood fibers treated by a magnetic immobilized laccase-mediator system

机译:磁固定漆酶-介体系统处理木纤维的化学,形态,晶体结构和亲水性

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The aim of this study was to investigate the surface properties of wood fibers treated by a magnetic immobilized laccase-mediator system (ILMS), which had never previously been examined. ESR results revealed that stable phenoxy radicals were generated in ILMS-treated fibers. No significant chemical structure changes in the fiber surface were observed in FTIR spectra, which was due to the fact that the laccase oxidation reaction is limited to occur in the part of the fiber surface lignin during a short incubation time of 1 h. Increased O/C ratio of the fiber surface, and also a reduction in the surface coverage of lignin were calculated from XPS spectra, which could be ascribed to the ILMS-catalyzed degradation of fiber surface lignin. The ILMS treatment also revealed 9.5% increase in the crystallinity index (CrI) of treated fibers as compared to the control. The SEM observations indicated that the mediator had a positive effect on depolymerization of surface lignin. The surface hydrophilicity enhancement of the ILMS-treated fiber was confirmed according to the increasing of water-holding capacity (WHC). These results have suggested the separable characteristics of the magnetic immobilized laccase, providing a promising approach to control the oxidation degree of fiber surface efficiently.
机译:这项研究的目的是研究用磁性固定的漆酶-介体系统(ILMS)处理过的木纤维的表面性能,这以前从未进行过检查。 ESR结果表明,在ILMS处理的纤维中产生了稳定的苯氧基。在FTIR光谱中未观察到纤维表面的明显化学结构变化,这是由于在短时间的1小时温育中,漆酶氧化反应仅限于在纤维表面木质素的一部分中发生的事实。从XPS光谱计算得出,纤维表面的O / C比增加,木质素的表面覆盖率降低,这可以归因于ILMS催化的纤维表面木质素降解。 ILMS处理还显示与对照相比,处理过的纤维的结晶度指数(CrI)提高了9.5%。 SEM观察表明,该介质对表面木质素的解聚有积极作用。随着持水量(WHC)的增加,证实了经ILMS处理的纤维的表面亲水性增强。这些结果表明磁性固定漆酶具有可分离的特性,为有效控制纤维表面的氧化程度提供了一种有希望的方法。

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