Abstract
HO. radical is an aggressive reagent to abstract hydrogen from diverse substitutes and lead them to degradation, however, in reaction of active oxygen species with lignins, complex phenolic polymers, in dispersed lignocellulose such as pulp for environment-benign delignification, HO. radicals should be eliminated as more as possible to prevent cellulose from unfavorably concomitant degradation. A reaction system of O3 is constructed under UV laser flash irradiation, and HO. radicals are controlled efficiently by it. A new mechanism is proposed, for the first time, that O. radicals generated from reaction of O3 with UV laser flash irradiation might be the contributor to scavenge HO. radicals.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Gratzl, J. S., Chen, C. L., Chemistry of pulping: lignin reactions, in ACS Symposium Series 742, Lignin: History, Reactions and Materials (eds. Glasser, W., Northey, R. A., Schultz, T. P.), Washington DC: American Chemical Society, 1999, 392–421.
Hosoya, S., Nonchlorine bleaching in view of structures and reactions of residual lignin in kraft pulp, Tappi J., 1992, 46: 2–19.
Ragnar, M., Eriksson, T., Reitberger, T. et al., A new mechanism in the ozone reaction with lignin like structures, Holzforschung, 1999, 53: 423–428.
Gierer, J., Formation and involvement of superoxide (O −•2 /HO •2 ) and hydroxyl (OH.) radicals in TCF bleaching processes: An review, Holzforschung, 1997, 51: 34–46.
Ragnar, M., Eriksson, T., Reitberger, T., Radicals formation in ozone reactions with lignin and carbohydrate model compounds, Holzforschung, 1999, 53: 292–298.
Ni, Y., Kang, G. J., Van Heiningen, A. R. P., Are hydroxyl radicals responsible for degradation of carbohydrates during ozone bleaching of chemical pulp? JPPS, 1996, 22(2): 53–57.
Gierer, E. M. J., Jansbo, K., Reitberger, T., Study on the selectivity of bleaching with oxygen-containing species, Holzforschung, 1989, 43: 391–396.
Lin, L., Chen, J. X., Application of ultraviolet light into the process of pulping and bleaching, Paper and Paper-Making, 1997, 4: 36.
Qiu, Y. Q., Xu, S. Y., Yu, L. N., Relationship between free radicals and bleaching of pulps. (I) Production of free radicals and its role in the bleaching process, Acta of South China University of Technology, 2001, 29(1): 64–69.
Becka, S., Jansbo, K., Reitberger, T., Detection of hydroxyl radicals by a chemiluminescence method—A critical review, Holzforschung, 1997, 51: 557–564.
Capanema, E. A., Chen, C. L., Gratzl, J. S. et al., Structural analysis of residual and technical lignins by 1H-13C correlation 2D NMR spectroscopy, Holzforschung, 2001, 55: 302–308.
Chen, C. L., Characterization of milled wood lignins and dehydrogenative polymerisates from monolignols by Carbon-13 NMR spectroscopy, in ACS Symposium Series 697, Lignin and Lignin Biosynthesis (eds. Lewis, N., Sarkanem, S.), Washington DC: American Chemical Society, 1998, 255–275.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lin, L., Zhou, X. & Qiu, Y. Selective degradation of lignin and elimination of HO radicals in pulps by O3 and UV laser flash irradiation. Sc. China Ser. B-Chem. 45, 311–318 (2002). https://doi.org/10.1360/02yb9040
Received:
Issue Date:
DOI: https://doi.org/10.1360/02yb9040