Regulation of superoxide anion radicals in bagasse alkali-oxygen pulping to enhance delignification selectively
Regulation of superoxide anion radicals in bagasse alkali-oxygen pulping to enhance delignification selectively
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DOI：
10.15376/biores.14.1.638-649
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发表时间：
2018-11
期刊：
影响因子：
1.5
通讯作者：
Xing Liang;Bing Sun;Y. Liu;Bao Zhang;Y. Shan;Xueping Song;Shuangxi Nie
中科院分区：
文献类型：
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作者：
Xing Liang;Bing Sun;Y. Liu;Bao Zhang;Y. Shan;Xueping Song;Shuangxi Nie
氧碱法制浆作为一种环境友好的制浆工艺受到了越来越多的关注，然而，由于碳水化合物的降解，所得纸浆的产率和性能都很低。研究了氧碱法制浆过程中超氧阴离子自由基（O2-·）对脱木素选择性的影响。采用BET、SEM和XRD对纸浆进行了表征。在1，2，3-三羟基苯自氧化体系中，添加2-蒽醌磺酸钠可通过调节O2-·来提高木素的脱除率，尤其是蒸煮120 min后的纸浆。添加2-蒽醌磺酸钠可促进超氧阴离子自由基的产生，提高氧碱法制浆的脱木素程度和选择性。结果表明，纤维素释放量的增加有利于O2-·与木质素的可接近性，有利于木质素的去除，而对纤维素的损伤较小，尤其是对结晶区的损伤较小。
Alkali-oxygen pulping has received increasing attention as an environmentally compatible pulping process; however, the resulting pulp has low yield and properties due to carbohydrate degradation. In this work, the effect of regulating superoxide anion radicals (O2-•) on delignification selectivity in alkali-oxygen pulping was investigated. The pulp was characterized by Brunauer-Emmett-Teller (BET) analysis, scanning electron microscope (SEM), and X-ray diffraction (XRD). Lignin removal was improved by the regulation of O2-• in the 1,2,3-trihydroxybenzene auto-oxidation system with addition of sodium 2-anthraquinonesulfonate, especially for the pulp from cooking time 120 min. The degree and selectivity of delignification were improved with alkali-oxygen pulping when sodium 2-anthraquinonesulfonate was added to facilitate the generation of superoxide anion radicals. The results showed that the increased fiber liberation was beneficial for the accessibility of O2-• to lignin, which would improve the removal of lignin with negligible damage on cellulose, especially with regards to crystal area.