title: Limited adsorption selectivity of active carbon toward non-saccharide compounds in lignocellulose hydrolysate.
abstract: Prehydrolysis of lignocellulose produces abundant hemicellulose-derived saccharides (HDS). To obtain pure HDS for application in food or pharmaceutical industries, the prehydrolysis liquor (PHL) must be refined to remove non-saccharide compounds (NSC) derived from lignin depolymerization and carbohydrate degradation. In this work, activated carbon (AC) adsorption was employed to purify HDS from NSC with emphasis on adsorption selectivity. The adsorption isotherms showed the priority of NSC to be absorbed over HDS at low AC level. However, increase of AC over 90% of NSC removal made adsorption non-selective due to competitive adsorption between NSC and HDS. Size exclusion chromatography showed that the adsorption of oligomeric HDS was dominant while monomeric HDS was inappreciable. The limited selectivity suggested that AC adsorption is infeasibility for HDS purification, but applicable as a pretreatment method.
authors.affiliation: Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China. Electronic address: wzj@qlu.edu.cn.
authors.forename: Zhaojiang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
authors.forename: Jingshun
authors.initials: J
authors.lastname: Zhuang
authors.affiliation: Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
authors.forename: Zongquan
authors.initials: Z
authors.lastname: Li
authors.affiliation: Key Laboratory of Paper Science & Technology, Qilu University of Technology, Jinan 250353, China.
authors.forename: Yingjuan
authors.initials: Y
authors.lastname: Fu
authors.affiliation: Laboratory of Organic Chemistry, Taishan University, Taian 271021, China.
authors.forename: Menghua
authors.initials: M
authors.lastname: Qin
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry*; D009844:Oligosaccharides / Q000302:isolation & purification; D011134:Polysaccharides / Q000737:chemistry*; D032107:Populus / Q000737:chemistry; D014934:Wood / Q000737:chemistry
chemical_list: D009844:Oligosaccharides; D011134:Polysaccharides; C036909:lignocellulose; D002606:Charcoal; C007916:hemicellulose; D008031:Lignin
keywords: Activated carbon; Adsorption; Hemicellulose; Lignin; Saccharide