Understanding changes in cellulose crystalline structure of lignocellulosic biomass during ionic liquid pretreatment by XRD
2013; Elsevier BV; Volume: 151; Linguagem: Inglês
10.1016/j.biortech.2013.10.009
ISSN1873-2976
AutoresJiafu Zhang, Yixun Wang, Liye Zhang, Ruihong Zhang, Guangqing Liu, Gang Cheng,
Tópico(s)Lignin and Wood Chemistry
ResumoX-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.
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