The changes of the structure and components of bamboo cell wall during chemical pretreatment
Bamboo,an abundant renewable biomass resource in Southern China,is traditionally applied for construction,pulping and papermaking,and chemical fiber products.The residues of bamboo may be considered as an attractive lignocellulosic substrate for biomass ethanol production through biorefinery because of its low content of ash(1%or less)and high content of holocellulose(64%-70%).Generally,a pretreatment process is needed to remove lignin resistance in bamboo for cellulose enzymatic hydrolysis,which is the key step for biomass converting to ethanol.In this study,the raw material,bamboo,was treated with acetic acid,and then hydrolyzed by enzymes.The effect of pretreatment with acetic acid or sodium hydroxide on the bamboo fiber cell wall structure was investigated.The changes of fiber components and cellulose crystallinity were measured during pretreatment.The cell wall structure of fibers dispersed from solids was analyzed by scanning electron microscopy(SEM).The result showed that more of hemicellulose degradation occurred during acetic acid treatment,while lignin dissolution mainly occurred under the sodium hydroxide treatment.The crystallinity of cellulose of bamboo increased in acetic acid treatmentwhile decreasedin sodium hydroxide treatment.The fiber bundle cells wall and parenchyma cells wall were thinned and collapsed after treatment.This phenomenon was noticeable for alkaline treatment.The sodium hydroxide treatment was more efficient than acetic acid treatment for bamboo to produce fermentable sugars.Cellulose enzymatic digestibility of substrates pretreated with 5%NaOH reached 87.3%.
Yangyag Peng Shiyu Fu Hao Liu Chunhui Zhang
State Kay Laboratory of Pulp and Paper Engineering,South China University of Technology Guangzhou,510640,China
国际会议
第五届制浆造纸新技术国际研讨会(ISETPP)暨第三届国际造纸与环境学术大会(IPEC)
广州
英文
1-6
2016-11-07（万方平台首次上网日期，不代表论文的发表时间）