摘要
为探讨γ射线辐照降解秸秆的机理,将微晶纤维素(MCC)作为模型化合物,利用扫描电镜(SEM)、拉曼光谱(FT-Raman)、气质联用(GC-MS)分别研究了0、200、400、600、800、1 000、1 200、1 400k Gyγ射线辐照对MCC物理、化学结构和小分子降解产物的影响。结果表明,MCC经辐照后孔隙增多,比表面积增加,MCC分子化学结构发生变化,新生成了羰基。MCC经高剂量辐照处理后产生大量小分子物质,其中至少包括20种脂肪酸、9种糖类和3种呋喃类物质。本研究结果为系统阐明辐照降解秸秆类生物质的机理提供了数据支撑。
To study the degradation mechanism of straw irradiated by γrays, microcrystalline cellulose （MCC） was used as a model substrate, the impacts of irradiation dose on the physical, chemical structure and irradiated-degradation components of MCC under 60 Co - γ irradiation （ 0,200,400,600,800,1 000,1 200,1 400 kGy） was comprehensively investigated. SEM analyses showed that, after irradiation, MCC became poriferous and its specific surface area increased, meanwhile, its chemical structure also changed, and FT-Raman analyses confirmed that irradiation resulted new carbanyl group. GC-MS results showed that there were large amount of small molecules including 20 aliphatic acids, 9 saccharides and 3 furan compounds in ethyl acetate extractives of MCC. This paper provides data basis for investigating degradation mechanism of lignoeellulose irradiated by γ rays.
出处
《核农学报》
CAS
CSCD
北大核心
2016年第9期1731-1737,共7页
Journal of Nuclear Agricultural Sciences
基金
湖南省作物种质创新与资源利用重点实验室开放研究项目(15KFXM17)
湖南省科技计划项目(2015WK3046)
