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A compound enzyme with synergistic interaction to treat cotton stalk chemi-mechanical pulp to improve the properties of wastepaper pulp

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Abstract

In this work, a compound enzyme treated cotton stalk chemi-mechanical pulp (CE-CSCMP) that could improve the properties of wastepaper pulp was investigated. Firstly, according to whether the enzymes (cellulase, xylanase, pectinase and lipase) could promote the mechanical properties of cotton stalk chemi-mechanical pulp (CSCMP) paper, xylanase, pectinase and lipase were selected to prepare compound enzyme. Afterwards, the underlying mechanism of enzymatic treatment of CSCMP was elucidated through the loss of cellulose, hemicellulose and lignin. Single enzymes, such as xylanase, pectinase or lipase, could only directly act on one substrate when treating CSCMP, while non-enzymatic substrates could impede the hydrolysis of the substrate. Therefore, the exposure area of cellulose was small, and the improvement of CSCMP paper strength was limited. It is found that there was a synergistic interaction between the three components in the compound enzyme, leading to a higher hydrolysis efficiency compared to that of single enzyme. Consequently, the area available for hydrogen bonding on the fiber surface was greatly increased, and CE-CSCMP obtained the best paper properties. Finally, CSCMP were furnished with wastepaper pulp, which resulted obvious improvement of the tensile strength, tear strength and ring compressive strength of wastepaper pulp. In conclusion, CE-CSCMP was a high-yield pulp of non-wood raw materials with better performance and could be used to improve wastepaper pulp.

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Funding

This work was supported by National Key R&D Program of China, Grant No. 2019YFC1905900, the National Natural Science Foundation of China (Grant No. 32230070), Natural Science Foundation of Shandong Province of China (Grant No. ZR2021ZD38), Jinan Innovation Team (Grant No. 2021GXRC023), the QUTJBZ Program (No. 2022JBZ01-05), and Taishan Scholars Program.

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Contributions

ZX: Data curation, Writing—original draft. ZT and QZ: Data curation, Conceptualization, Supervision. X-XJ and DW: Writing-review & editing, Project administration, Funding acquisition. RW: Formal analysis, Investigation, Validation, Visualization.

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Correspondence to Xing-Xiang Ji.

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Xie, Z., Tian, Z., Zhao, Q. et al. A compound enzyme with synergistic interaction to treat cotton stalk chemi-mechanical pulp to improve the properties of wastepaper pulp. Cellulose 30, 9013–9026 (2023). https://doi.org/10.1007/s10570-023-05298-2

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  • DOI: https://doi.org/10.1007/s10570-023-05298-2

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