Selective degradation of lignin and elimination of HO radicals in pulps by O_3 and UV laser flash irradiation  

作　　者：林鹿 周贤涛 邱玉桂 

出　　处：《Science China Chemistry》2002年第3期311-318,共8页中国科学（化学英文版）

基　　金：This work was supported by the Research Fund of Ministry of Education for Academic Institutionof Doctoral Education (Grant No. 2000056109) ; Research Fund for Returned Overseas Chinese Scholars (Grant No. 2000479).

摘　　要：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.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.

关 键 词：UV laser O3 BLEACHING SELECTIVE DEGRADATION of lignins. 

分 类 号：O644[理学—物理化学]