摘要
利用元素分析、功能基分析和傅里叶变换红外光谱(FTIR)对旧报纸漆酶/介体脱墨过程中木素结构的变化进行分析,并利用凝胶渗透色谱(GPC)测定木素的分子质量及其分布。元素分析及功能基分析结果表明,漆酶/介体处理后,木素C9单元分子质量降低,木素的酚羟基和甲氧基含量降低,羰基和羧基含量升高。红外光谱分析结果显示,漆酶/介体处理过程中存在木素结构的部分破坏与溶出。GPC测定结果表明,漆酶/介体处理后浆料中木素的数均分子质量、重均分子质量及多分散性均下降,说明木素受到了一定程度的降解。
Dioxane lignin was extracted from control sample and laccase-mediator system （LMS） deinked pulp of old newspaper. Their structures were analyzed by elemental analysis, functional groups determination, FTIR. Comparing with the lignin from the control pulp, phenolic hydroxy and methoxyl content of the lignin from LMS deinked pulp decreased, while content of carboxyl and carhonyl groups increased. FTIR results showed that part of lignin was degraded and dissolved during the LMS treatment. Gel permeation chromatogram was used to investigate the change of lignin molar mass. Number average molecular weight, weight average molecular weight and polydispersity of lignin from LMS deinked pulp were lower than those of lignin from the control pulp, which indicated that lignin was somewhat degraded during the LMS deinking.
出处
《中国造纸学报》
CAS
CSCD
2006年第2期26-30,共5页
Transactions of China Pulp and Paper
关键词
旧报纸
漆酶/介体
脱墨
木素
分析
old newspaper
laccase-mediator system
deinking
lignin
elemental analysis
fimctional groups
FTIR
GPC
