NaOH溶液处理甘蔗渣过程中纤维素晶体结构的变化
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摘要
使用傅里叶红外变换光谱仪(FT-IR)、X射线衍射仪(XRD)、扫描电镜(SEM)表征了经不同浓度的NaOH溶液处理的甘蔗渣的纤维素晶体结构的变化。结果表明:甘蔗渣纤维素的结晶度指数与NaOH溶液的浓度之间的相关性不是线性的,而是呈现先上升后下降的趋势。FT-IR表征甘蔗渣纤维素的结构能进一步证明甘蔗渣纤维素的晶体结构受NaOH溶液影响的程度很大。完整的处理过程大概分为两个阶段,即在低浓度的NaOH溶液范围内,甘蔗渣的结晶度值升高,当NaOH溶液浓度再升高时,甘蔗渣纤维素的结晶度值下降。低结晶度的甘蔗渣结晶区域被破坏,有利于甘蔗渣的进一步降解及应用,对工业中使用合适浓度的碱液处理甘蔗渣具有一定的指导意义。
Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD)and scanning electron microscopy(SEM)are used to characterize the changes of cellulose crystal structure of bagasse treated with different concentration of NaOH solution.The results show that the correlation between the crystallization index of bagasse cellulose and the concentration of NaOH solution is not linear,but increases firstly and then decreases.FT-IR characterization of bagasse cellulose further proves that the crystal structure of bagasse cellulose is greatly affected by NaOH solution.The complete treatment process can be divided into two stages:the crystallinity value of bagasse increases in the range of low-concentration NaOH solution,and decreases when NaOH solution concentration increases again.The destruction of crystalline zone of bagasse with low crystallinity is conducive to the further degradation and application of bagasse.It has certain guiding significance for industrial use of appropriate concentration of alkali liquor to treat bagasse.
Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD)and scanning electron microscopy(SEM)are used to characterize the changes of cellulose crystal structure of bagasse treated with different concentration of NaOH solution.The results show that the correlation between the crystallization index of bagasse cellulose and the concentration of NaOH solution is not linear,but increases firstly and then decreases.FT-IR characterization of bagasse cellulose further proves that the crystal structure of bagasse cellulose is greatly affected by NaOH solution.The complete treatment process can be divided into two stages:the crystallinity value of bagasse increases in the range of low-concentration NaOH solution,and decreases when NaOH solution concentration increases again.The destruction of crystalline zone of bagasse with low crystallinity is conducive to the further degradation and application of bagasse.It has certain guiding significance for industrial use of appropriate concentration of alkali liquor to treat bagasse.
引文
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[2]Cardona C A,Quintero J A,Paz I C.Production of bioethanol from sugarcane bagasse:status and perspectives[J].Bioresour Technol,2010,101:4754-4766.
[3]Martin C,Klinke H B,Thomsen A B.Wet oxidation as a pretreatment method for enhancing the enzymatic convertibility of sugarcane bagasse[J].Enzyme Microb Technol,2007,40:426-432.
[4]Cerqueira D A,Rodrigues G,Meireles C D.Optimization of sugarcane bagasse cellulose acetylation[J].Carbohydr Polym,2007,69:579-582.
[5]Pandy A,Soccol C R,Nigam P,et al.Biotechnological potential of agro-industrial residues I:sugarcane bagasse[J].Bioresour Technol,2000,74:69-80.
[6]舒雪梅,刘建本,刘红艳.甘蔗渣乙醇化预处理方法比较[J].吉首大学学报:自然科学版,2014,35(1):83-87.
[7]Andersson S,Serimaa R,Paakkari T,et al.Crystallinity of wood and the size of cellulose crystallites in Norway spruce(Picea abies)[J].Journal of Wood Science,2003,49(6):531-537.
[8]Lavoine N,Desloges I,Dufresne A,et al.Microfibrillated cellulose-its barrier properties and applications in cellulosic materials:a review[J].Carbohydrate Polymers,2012,90:735-764.
[9]Lee C,Dazen K,Kafle K,et al.Correlations of apparent cellulose crystallinity determined by XRD,NMR,IR,Raman,and SFG methods[J].Advances in Polymer Science,2016,271:115-132.
[10]Segal L,Creely J J,Martin A E,et al.An empirical method for estimating the degree of crystallinity of native cellulose using the X-ray diffractometer[J].Textile Research Journal,1959,29(10):786-794.
[11]Garvey C J,Parker I H,Simon G P.On the interpretation of X-ray diffraction powder patterns in terms of the nanostructure of cellulose I fibers[J].Macromolecular Chemistry and Physics,2005,206:1568-1575.
[12]Hult L E,Iversen T,Sugiyama J.Characterization of the supramolecular structure of cellulose in wood pulp fibers[J].Cellulose,2003,10(2):103-110.
[13]Ju X,Bowden M,Brown E E,et al.An improved X-ray diffraction method for cellulose crystallinity measurement[J].Carbohydrate Polymers,2015,123:476-481.
[14]Park S,Baker J O,Himmel M E,et al.Cellulose crystallinity index:measurement techniques and their impact on interpreting cellulase performance[J].Biotechnology for Biofuels,2010(3):1-10.
[15]Terinte N,Ibbett R,Schuster K C.Overview on native cellulose and microcrystalline cellulose I structure studied by X-ray diffraction(WAXD):comparison between measurement techniques[J].Lenzinger Berichte,2011,89:118-131.
[16]Mariana K M,Ricardo S,Sobral T,et al.Continuous pretreatment of sugarcane biomass using a twin-screw extruder[J].Industrial Crops and Products,2017,97:509-517.
[17]Oh S Y,Yoo D I,Shin Y,et al.Crystalline structure analysis of cellulose treated with sodium hydroxide and carbon dioxide by means of X-ray diffraction and FTIR spectroscopy[J].Carbohydrate Research,2005,340:2376-2391.
[18]Nelson M,O'Connor R T.Relation of certain infrared bands to cellulose crystallinity and crystal lattice type.Part II.A new infrared ratio for estimation of crystallinity in cellulose I and II[J].Journal of Applied Polymer Science,1964(8):1325-1341.
[19]Hurtubise F G,Krasig H.Classification of fine structural characteristics in cellulose by infrared spectroscopy:use of potassium bromide pellet technique[J].Analytical Chemistry,1960,32:177-181.
[20]Dadi A P,Varanasi S,Schall C A,et al.Enhancement of cellulose saccharification kinetics using an ionic liquid pretreatment step[J].Biotechnology and Bioengineering,2006,95(5):904-910.
[21]Goswami P,Blackburn R S,El-Dessouky H M,et al.Effect of sodium hydroxide pre-treatment on the optical and structural properties of lyocell[J].European Polymer Journal,2009,45:455-465.
[22]Sunghyun N,Alfred D,Brian D,et al.Segal crystallinity index revisited by the simulation of X-ray diffraction patterns of cotton celluloseⅠβ,and celluloseⅡ[J].Carbohydrate Polymers,2016,135:1-9.
[23]Gupta P K,Vanshi U,Sanjay N.Polymorphic transformation of celluloseⅠto celluloseⅡby alkali pretreatment and urea as an additive[J].Carbohydrate Polymers,2013,94:843-849.
[24]Hearle J W S.A fringed fibril theory of structure in crystalline polymers[J].Journal of Polymer Science,1958,28:432-435.
[25]Leitner J,Seyfriedsberger G,Kandelbauer A.Modifications in the bulk and the surface of unbleached lignocellulosic fibers induced by a heat treatment without water removal:effects on fibre relaxation of PFI-beaten kraft fibers[J].European Journal of Wood and Wood Products,2013,71(6):725-738.
[26]Zhao X B,Wang L,Liu D H.Peracetic acid pretreatment of sugarcane bagasse for enzymatic hydrolysis:a continued work[J].Journal of Chemical Technology and Biotechnology,2008,83(6):950-956.
[27]Zhu Z,Zhu M,Wu Z.Pretreatment of sugarcane bagasse with NH4OH-H2O2 and ionic liquid for efficient hydrolysis and bioethanol production[J].Bioresource Technology,2012,119:199-207.
[28]Schwanninger M,Rodrigues J C,Pereira H,et al.Effects of short-time vibratory ball milling on the shape of FT-IR spectra of wood and cellulose[J].Vibrational Spectroscopy,2004,36:23-40.
[29]Stubicar N,Smit I,Stubicar M,et al.An X-Ray diffraction study of the crystalline to amorphous phase change in cellulose during high-energy dry ball milling[J].Holzforschung,1998,52(5):455-458.
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[32]Liu W,Wang B,Hou Q,et al.Effects of fibrillation on the wood fiber's enzymatic hydrolysis enhanced by mechanical refining[J].Bioresource Technology,2016,206:99-103.