Research on FTIR Analysis of Populus nigra L. Lignin Structure Changes in Different Bleaching Processes

Abstract:

Article Preview

To study the bleaching mechanisms of H2O2 bleaching, H2O2 displacement bleaching and H2O2 /TAED bleaching, three kinds of lignin bleached with above processes were obtained. Three types of treated Populus nigra L lignins structure were identified and the functional groups were quantitied by FTIR. In contrast, the deacetylation and the breakage of ester bonds in H2O2/TAED bleaching system was much more significant. The total carbonyl group of H2O2 bleached lignin decreased 6.6% while displacement bleached lignin and H2O2/TAED bleached lignin decreased 9.2% and 15.8% respectively. The PT bleaching process had stronger oxidability to destroy the syringyl units in lignin. The breakage of ether bonds and alcoholic hydroxyl dehydration in side chain increased after bleaching. In contrast, the stronger destroyed effection on guaiacyl dialkyl ether bond with PT bleaching processes. The conclusions obtained may interpret H2O2 displacement bleaching and H2O2/TAED bleaching systems have better bleaching efficiency than H2O2 bleaching system.

Info:

Periodical:

Advanced Materials Research (Volumes 236-238)

Edited by:

Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao

Pages:

1283-1287

DOI:

10.4028/www.scientific.net/AMR.236-238.1283

Citation:

Q. Zhao et al., "Research on FTIR Analysis of Populus nigra L. Lignin Structure Changes in Different Bleaching Processes", Advanced Materials Research, Vols. 236-238, pp. 1283-1287, 2011

Online since:

May 2011

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.