Fiber characterization of old corrugated container bleached pulp with laccase and glycine pretreatment

• Published in: Biomass conversion and biorefinery Vol. 13; no. 2; pp. 583 - 592
• Main Authors: Chen, Guozheng, Dong, Junjing, Wan, Jinquan, Ma, Yongwen, Wang, Yan
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.01.2023; Springer Nature B.V
• Subjects: Additives; Biotechnology; Bleaching; Coarseness; Containers; Energy; Fourier transforms; Gas chromatography; Glycine; Hydrogen peroxide; Infrared spectroscopy; Laccase; Lignin; Original Article; Pretreatment; Raw materials; Renewable and Green Energy; X-ray diffraction; Fiber morphology; Glycine; Physical properties; Optical properties; Laccase
• ISSN: 2190-6815; 2190-6823
• DOI: 10.1007/s13399-020-01200-3

In response to deal with the increasingly serious environmental problems and shortage of fiber raw materials, biological enzyme pretreatment is an effective way to replace a large number of chemical additives to improve the properties of waste paper fibers. Fiber characterization of old corrugated container bleached pulp with laccase and glycine (Lac/Gly) pretreatment was investigated by means of Fourier transform infrared spectroscopy (FTIR), headspace gas chromatography (HSGC), fiber quality measurements (FQA), X-ray diffraction method (XRD), and atomic force microscope (AFM). Results showed that, compared with the control pulp, the whiteness and brightness of the Lac/Gly-treated pulp increased by 16.17% and 7.41%, respectively. And the FTIR showed that Lac/Gly pretreatment promotes the effective removal of lignin by hydrogen peroxide (H 2 O 2 ) bleaching. The content of carboxyl groups in pulp increased remarkably by 21.92%. The paper physical analysis showed that the paper strength properties have improved remarkably. The fiber quality analyses indicated that the fiber length, coarseness, and curl index changed a little. The XRD analysis showed that the crystallinity decreased by 5.83% due to Lac/Gly treatment. The AFM analysis showed that through Lac/Gly treatment, the lignin and extracts over the fiber surface are decreased significantly.