| Selective degradation of lignin and elimination of HO radicals in pulps by O_3 and UV laser flash irradiation |
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| 作者姓名： | 林鹿 周贤涛 邱玉桂 |
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| 作者单位： | LIN Lu ZHOU Xiantao & QIU YuguiState Key Laboratory of Pulp and Paper Engineering，College of Environment and Paper engineering，South China University of Technology，Guangzhou 510640，China |
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| 基金项目： | This work was supported by the Research Fund of Ministry of Education for Academic Institution
of Doctoral Education (Grant No. 2000056109)，Research Fund for Returned Overseas Chinese Scholars (Grant No. 2000479). |
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| 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.
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Selective degradation of lignin and elimination of HO·radicals in pulps by O3 and UV laser flash irradiation |
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| LIN Lu ZHOU Xiantao & QIU YuguiState Key Laboratory of Pulp and Paper Engineering,College of Environment and Paper engineering,South China University of Technology,Guangzhou ,China.Selective degradation of lignin and elimination of HO radicals in pulps by O_3 and UV laser flash irradiation[J].Science in China(Chemistry),2002,45(3). |
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| Authors: | LIN Lu ZHOU Xiantao & QIU YuguiState Key Laboratory of Pulp and Paper Engineering College of Environment and Paper engineering South China University of Technology Guangzhou China |
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| Institution: | State Key Laboratory of Pulp and Paper Engineering, College of Environment and Paper engineering, South China University of Technology, Guangzhou 510640, China |
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| 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. |
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| Keywords: | UV laser O3 bleaching selective degradation of lignins |
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