Enzyme and Alkali-Aided ECF Bleaching of Kraft Bamboo Pulp

BioResources

Chengrong Qin¹  Shaungxi Nie¹  Yingying Du²  Xiannan Huang²  Xueping Song² 

[1] China;College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, PR China;

关键词: Alkaline treatment;    Xylanase;    AOX;    Laccase;    FTIR;    Surface lignin;   

DOI  :  10.15376/biores.10.4.7372-7385

来源: DOAJ

【 摘 要 】

Unbleached kraft bamboo pulp was pretreated by a xylanase and laccase (X/L) treatment, as well as a joint treatment of X/L and alkali, prior to element chlorine free (ECF) bleaching. In comparison with the control test, the joint treatment of X/L and alkali (X/L+0.1%) had more potential to reduce absorbable organic halide (AOX) levels (29.79%) and COD content (21.55%), in addition to improving bleached pulp properties (56.88% decrease in kappa number and 8.94 %ISO increased in brightness). Moreover, the treatment of X/L+0.1% removed more lignin and HexA than X/L treatment. The analysis of XPS indicated that the X/L treatment could noticeably remove the surface lignin of pulp, but the joint treatments of X/L and alkali could promote the production of superficial lignin. FTIR results showed that pretreatments only reduced part of the lignin and carbohydrate contents, but did not change their structures. The joint pretreatment of enzymes and diluted alkali (X/L+0.1%) had more appealing advantages to produce bleached kraft bamboo pulp.

【 授权许可】

Unknown