%A Qiulu CHU,Xueyan CHEN,Kai SONG,Jing WANG,Xiaodong ZHANG,Aiping SHI %T Effects of Two-stage Pretreatment on Enzymatic Hydrolysis of Poplar and Adsorption Performance of Lignin %0 Journal Article %D 2019 %J Chemistry and Industry of Forest Products %R 10.3969/j.issn.0253-2417.2019.06.009 %P 68-74 %V 39 %N 6 %U {http://www.cifp.ac.cn/CN/abstract/article_2624.shtml} %8 2019-12-28 %X

Effects on enzymatic hydrolysis of poplar and adsorption performance of lignin by two-stage pretreatment were established. The lignin content of raw biomass was 29.05%, while cellulose hydrolysis yield was only 15.24%. After steam explosion pretreatment, lignin content increased to 34.88%, and the acid group in biomass was 10.16 mmol/kg. As a result, the yield of cellulose by hydrolysis enhanced to 56.88%. However, lignin was hardly removed from biomass, which could not be recovered by acid precipitation to prepare lignin adsorbents.The lignin content decreased to 21.06% and 17.68%, incorporated with acid groups increased to 101.34 and 107.69 mmol/kg after alkaline oxidation-steam explosion and alkaline sulfonation-steam explosion pretreatment.And the yield of cellulose hydrolysis enhanced from 56.88% to 74.38% and 81.09%. Besides, around 50% of the original lignin was removed from biomass, which could be recovered as lignin adsorbents for Pb(Ⅱ) ions with adsorption capacity of 158.73 and 142.86 mg/g. The obtained results demonstrated that alkaline sulfonation-steam explosion pretreatment largely improved lignin removal and modification, which enhanced both the enzymatic hydrolysis of cellulose and the adsorption performance of lignin for holistic utilization of lignocellulosic biomass.