木聚糖酶去除己烯糖醛酸以减少甘蔗渣浆二氧化氯漂白中可吸附有机卤化物的形成
Removal of hexenuronic acid by xylanase to reduce adsorbable organic halides formation in chlorine dioxide bleaching of bagasse pulp.
作者信息
Nie Shuangxi, Wang Shuangfei, Qin Chengrong, Yao Shuangquan, Ebonka Johnbull Friday, Song Xueping, Li Kecheng
机构信息
College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, PR China; Department of Chemical Engineering, University of New Brunswick, Fredericton, NB E3B5A3, Canada.
College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, PR China.
出版信息
Bioresour Technol. 2015 Nov;196:413-7. doi: 10.1016/j.biortech.2015.07.115. Epub 2015 Aug 4.
Xylanase-aided chlorine dioxide bleaching of bagasse pulp was investigated. The pulp was pretreated with xylanase and followed a chlorine dioxide bleaching stage. The ATR-FTIR and XPS were employed to determine the surface chemistry of the control pulp, xylanase treated and chlorine dioxide treated pulps. The hexenuronic acid (HexA) could obviously be reduced after xylanase pretreatment, and the adsorbable organic halides (AOX) were reduced after chlorine dioxide bleaching. Compared to the control pulp, AOX could be reduced by 21.4-26.6% with xylanase treatment. Chlorine dioxide demand could be reduced by 12.5-22% to achieve the same brightness. The ATR-FTIR and XPS results showed that lignin and hemicellulose (mainly HexA) were the main source for AOX formation. Xylanase pretreatment could remove HexA and expose more lignin, which decreased the chlorine dioxide demand and thus reduced formation of AOX.
研究了木聚糖酶辅助的甘蔗渣浆二氧化氯漂白工艺。该浆先用木聚糖酶预处理，然后进行二氧化氯漂白阶段。采用衰减全反射傅里叶变换红外光谱（ATR-FTIR）和X射线光电子能谱（XPS）来测定对照浆、经木聚糖酶处理的浆和经二氧化氯处理的浆的表面化学性质。木聚糖酶预处理后，己烯糖醛酸（HexA）可明显减少，二氧化氯漂白后可吸附有机卤化物（AOX）减少。与对照浆相比，经木聚糖酶处理后AOX可减少21.4-26.6%。为达到相同亮度，二氧化氯需求量可减少12.5-22%。ATR-FTIR和XPS结果表明，木质素和半纤维素（主要是HexA）是AOX形成的主要来源。木聚糖酶预处理可去除HexA并使更多木质素暴露，这降低了二氧化氯需求量，从而减少了AOX的形成。
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