Understanding changes in cellulose crystalline structure of lignocellulosic biomass during ionic liquid pretreatment by XRD.
Understanding changes in cellulose crystalline structure of lignocellulosic biomass during ionic liquid pretreatment by XRD.
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DOI：
10.1016/j.biortech.2013.10.009
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发表时间：
2014
影响因子：
11.4
通讯作者：
Jiafu Zhang;Yixun Wang;Liye Zhang;Ruihong Zhang;Guang-qing Liu;G. Cheng
中科院分区：
文献类型：
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作者：
Jiafu Zhang;Yixun Wang;Liye Zhang;Ruihong Zhang;Guang-qing Liu;G. Cheng
利用X射线衍射（XRD）研究了离子液体（ILs）与木质纤维素生物质中纤维素的相互作用。该实验的设计是以这样一种方式，在植物细胞壁中的结晶纤维素的溶胀和增溶的过程中，通过XRD跟踪。在50-130°C的温度下使用1-丁基-3-甲基咪唑乙酸盐（[C4 mim][0Ac]）预处理三种不同的原料柳枝稷、玉米秸秆和稻壳6小时。在5 wt.%生物质负载，增加预处理温度导致生物质结晶度指数（CrI）下降，这是由于结晶纤维素的溶胀。在大部分结晶纤维素被IL分子溶胀后，在预处理的样品中发现了低级结构。进一步升高温度后，由于纤维素在[C4 mim][OAM]中溶解并随后再生，预处理的生物质样品中开始形成纤维素II结构。
X-ray diffraction (XRD) was used to understand the interactions of cellulose in lignocellulosic biomass with ionic liquids (ILs). The experiment was designed in such a way that the process of swelling and solubilization of crystalline cellulose in plant cell walls was followed by XRD. Three different feedstocks, switchgrass, corn stover and rice husk, were pretreated using 1-butyl-3-methylimidazolium acetate ([C4mim][OAc]) at temperatures of 50–130°C for 6 h. At a 5 wt.% biomass loading, increasing pretreatment temperature led to a drop in biomass crystallinity index (CrI), which was due to swelling of crystalline cellulose. After most of the crystalline cellulose was swollen with IL molecules, a low-order structure was found in the pretreated samples. Upon further increasing temperature, cellulose II structure started to form in the pretreated biomass samples as a result of solubilization of cellulose in [C4mim][OAc] and subsequent regeneration.