Ionic Liquid Pretreatment of Poplar Wood at Room Temperature: Swelling and Incorporation of Nanoparticles
Ionic Liquid Pretreatment of Poplar Wood at Room Temperature: Swelling and Incorporation of Nanoparticles
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DOI：
10.1021/am100371q
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发表时间：
2010-08-01
影响因子：
9.5
通讯作者：
Rector, Kirk D.
中科院分区：
文献类型：
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作者：
Lucas, Marcel;Macdonald, Brian A.;Rector, Kirk D.
与玉米淀粉相比，木质纤维素生物质在生产生物燃料方面具有经济和环境优势。然而，由于木质素的耐化学性和复杂的细胞壁结构，其分级目前需要能量密集的预处理。最近，离子液体已被用于在高温下溶解生物质。采用离子液体（1-乙基-3-甲基咪唑乙酸盐）对白杨薄切片进行预处理，在室温下进行溶胀。当用去离子水冲洗时，样品收缩。木材结构的受控膨胀和收缩可用于将酶和催化剂深入到木材结构中，以改善预处理和加速纤维素水解。作为概念的证明，将直径范围为20至100 nm的银和金纳米颗粒掺入到高达4 μ m的深度。在不同深度的共焦表面增强拉曼图像显示，大量的纳米粒子被纳入到预处理的样品中，并且它们在冲洗后保留在样品上。定量X射线荧光显微分析表明，大多数纳米粒子的掺入发生在离子液体预处理小于1小时后。除了改进的预处理，将材料和化学品掺入木材和纸制品中可以实现同位素追踪，开发新的传感和成像能力。
Lignocellulosic biomass offers economic and environmental advantages over corn starch for biofuels production. However, its fractionation currently requires energy-intensive pretreatments, due to the lignin chemical resistance and complex cell wall structure. Recently, ionic liquids have been used to dissolve biomass at high temperatures. In this study, thin sections of poplar wood were swollen by ionic liquid (1-ethyl-3-methylimidazolium acetate) pretreatment at room temperature. The samples contract when rinsed with deionized water. The controlled expansion and contraction of the wood structure can be used to incorporate enzymes and catalysts deep into the wood structure for improved pretreatments and accelerated cellulose hydrolysis. As a proof of concept, silver and gold nanoparticles of diameters ranging from 20 to 100 nm were incorporated at depths up to 4 mu m. Confocal surface-enhanced Raman images at different depths show that a significant number of nanoparticles were incorporated into the pretreated sample, and they remained on the samples after rinsing. Quantitative X-ray fluorescence microanalyses indicate that the majority of nanoparticle incorporation occurs after an ionic liquid pretreatment of less than 1 h. In addition to improved pretreatments, the incorporation of materials and chemicals into wood and paper products enables isotope tracing, development of new sensing, and imaging capabilities.