杨木心材白腐菌预处理及生物化机浆制浆性能研究

doi:10.3969/j.issn.0253-2417.2022.06.013

Abstract

Abstract:

The white-rot fungus Trametes sp.48424 was used to pretreat poplar heartwood for the biochemical-mechanical pulp(Bio-CMP). The laccase activity of white-rot fungus during pretreatment was measured, and the changes in the chemical composition of poplar heartwood before and after pretreatment were also analyzed. Moreover, scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FT-IR), carbon-13 nuclear magnetic resonance(¹³C NMR) were applied to intensively study the degradation mechanism of peplar heartwood by white-rot-fungus. Using Bio-CMP process, the changes of pulp fiber morphology and paper properties were discussed. The results showed that the white-rot fungus could perform solid-state fermentation well on the surface of the heartwood chips, and the laccase activity reached the maximum value of 1.3 IU/mL after 8 day of pretreatment. In the pretreatment stage, the white-rot fungus could lead to a porous and wrinkled surface structrue of the wood chip, and the degradation rate of Klason lignin was higher than that of holocellulose. White-rot fungus pretreatment could cleave β-O-4 side chain(δ 60.6, 72.7) substructure in milled wood lignin(MWL) effectively, while it had little effect on aromatic rings, reflecting that the degradation of lignin by white-rot fungus mainly happened on the lignin side chain. Compared with reference experiment, after poplar heartwood chips being pretreated by white-rot fungus, the fiber length and kinking index of the pulp increased, the content of fines reduced, and the paper strength enhanced obviously.

Key words: white-rot fungus, poplar heartwood, milled wood lignin, paper strength

CLC Number:

TQ35
TS743

Wenqi LUO, Yimin XIE, Gongxia ZHANG. Pretreatment of Poplar Heartwood by White-rot Fungus and Performance of Biological Chemi-mechanical Pulping[J]. Chemistry and Industry of Forest Products, 2022, 42(6): 91-98.

Figures/Tables 7

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References 26

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样品 samples	Klason木质素 Klason lignin	综纤维素 holocellulose	1% NaOH抽出物 1% NaOH extractive	苯-醇抽出物 benzene-alcohol extractive	丙酮抽出物 acetone extractive	热水抽出物 hot water extractive
心材heartwood	24.24	76.72	18.30	1.35	0.80	3.22
边材sapwood	21.46	79.21	15.66	1.21	0.65	1.68

浆料¹⁾ pulp	重均长度/mm weight average length	纤维宽度/μm fiber width	细小纤维/% fine	扭结指数 kink index
6%Bio-CMP	0.589	29.3	18.3	2.825
6%-CMP	0.571	29.7	22.9	2.664
8%Bio-CMP	0.665	28.1	14.0	3.047
8%-CMP	0.652	28.7	15.4	2.903
10%Bio-CMP	0.582	29.0	14.8	2.900
10%-CMP	0.576	29.6	19.2	2.733

浆料 pulp	紧度/(g·cm^-3) density	抗张指数/(N·m·g^-1) tensile index	环压指数/(N·m·g^-1) ring crush index	耐破指数/(kPa·m²·g^-1) bursting index	耐折次数/(MIT) folding endurance
6%Bio-CMP	0.515	35.2	8.6	1.67	1
6%-CMP	0.472	31.0	7.0	1.47	1
8%Bio-CMP	0.541	38.2	9.2	2.04	5
8%-CMP	0.519	32.9	7.9	1.82	3
10%Bio-CMP	0.505	35.3	8.2	1.90	4
10%-CMP	0.493	31.5	7.7	1.67	2

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Pretreatment of Poplar Heartwood by White-rot Fungus and Performance of Biological Chemi-mechanical Pulping

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