Biodeinking of mixed ONP and OMG waste papers with cellulase

Akbarpour, I; Ghasemian, A; Saraeian, A R

doi:10.1007/s10570-017-1641-y

Cited by 19 publications

(19 citation statements)

References 19 publications

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“…Additionally, the specific surface area of the fibers increased and more hydroxyl groups were exposed on the fiber surface, thus increasing the binding strength between the fibers. After xylanase treatment, the fiber length and aspect ratio increased, mainly because the part of the hemicellulose on the fiber surface and cell wall is easy to degrade, which is conducive to the absorption and expansion of the fiber, and is not easy to be cut off [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of Lipase and Xylanase Pretreatment on the Structure and Pulping Properties of Wheat Straw

et al. 2022

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Based on the reduction of environmental pollution, a biological enzyme assisted alkali-oxygen pulping method was explored to improve the delignification efficiency and fiber accessibility of wheat straw and improve the properties of wheat straw pulp. In this paper, lipase and xylanase were used to pretreat wheat straw and the effects of different enzyme types and enzyme dosage on the microstructure and pulp properties of wheat straw were investigated and experimented. The results showed that the lipase can remove fat and wax on the surface of wheat straw, while xylanase degraded the hemicellulose components, such as xylan, of wheat straw fiber, destroyed the structure of the lignin-carbohydrate complex, increasing lignin removal as a result and enhancing the impregnating, diffusion and penetration of alkali. Compared with wheat straw without enzyme pretreatment, the skeleton of wheat straw pretreated by enzyme became looser, the internal cavity appeared and the wall cavity became thin and transparent. The fines decreased obviously and the length of fibers increased. After combined pretreatment with lipase (15 U·g−1) and xylanase (15 U·g−1), the pulping performance of wheat straw was improved and the tensile index (97.37 N·m·g−1), brightness (40.9% ISO) and yield (58.10%) of the pulp increased by 12.9%, 19.9% and 9.9%, respectively. It can be seen that enzyme pretreatment is a green and effective approach to improving the alkali-oxygen pulping performance of wheat straw.

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Section: Resultsmentioning

confidence: 99%

Effects of Lipase and Xylanase Pretreatment on the Structure and Pulping Properties of Wheat Straw

et al. 2022

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“…Reaction time is crucial for the interaction of enzyme and ink particles on bre surfaces along with the proper enzyme dose (Akbarpour et al, 2018;Wang et al, 2018). The increase in residual ink count at 120 min might be due to the deposition of ink particles on bre pits during deinking reaction for a longer duration (Pelach et al, 2003;Vyas and Lachke, 2003).…”

Section: Effect Of Reaction Time On Pulp and Paper Properties After D...mentioning

confidence: 99%

Cellulase-assisted deinking approach for the recycling of mixed office waste papers and its quality improvement

Pathak

Sango

Sabharwal

et al. 2022

Preprint

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This study involves the evaluation of the potential of commercial cellulase enzyme for the deinking of mixed office waste paper. The pH and temperature optima for the enzyme were 6.0 and 50°C. Enzyme dose and reaction time for the deinking process were optimized. An optimum dose of 300 g/t and reaction time of 90 min for commercial cellulase enzyme significantly improved deinking efficiency (79.3%) than the control set (59.4%) and chemical deinking (75.7%). Strength properties (except tear index) like tensile index, breaking length, burst factor and double fold were improved at optimized conditions. Cleanliness of pulp in terms of dirt and specks contents was also improved up to a significant level after cellulase treatment. Thus, it was concluded that commercial cellulase enzyme-based deinking was better than chemical deinking of mixed office waste in terms of improved pulp and paper quality.

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“…Jin et al discussed the promotion of water-soluble lignin on cellulase hydrolysis [86]. In recent studies, cellulase has been used in the deinking process of mixed wastepaper of old newspapers and old magazine pulp to increase the deinking efficiency under mild conditions [87]. Jiang et al used lipase to treat wheatgrass and explored the relationship between biological enzymes and their characteristic information [88].…”

Section: Introductionmentioning

confidence: 99%

Effects of different amounts of cellulase on the microstructure and soluble substances of cotton stalk bark

Xie

Tian

Liu

et al. 2022

Adv Compos Hybrid Mater

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There are plant cuticle and complex cell walls on the outer surface of cotton stalk bark (CSB), which reduce the efficiency of liquid penetration of CSB. To increase the permeability of liquids, these barriers need to be broken. Cellulase can selectively hydrolyze cellulose into glucose, and its action conditions are mild. Therefore, cellulase treatment is one of the excellent ways to break the CSB liquid permeation barrier. This experiment studied the effects of different amounts of cellulase treatment on the enzymatic hydrolysis products and surface of CSB. Scanning electron microscopy (SEM) and nano-CT were used to observe the changes in the microscopic morphology of CSB. Ion chromatography and an ultraviolet–visible spectrophotometer were used to determine the dissolution of CSB. The results showed that the cuticle of CSB treated with cellulase was broken, and the cell wall of phloem fibers became thinner, which increased the accessibility of liquid. The content of monosaccharide and lignin in CSB treatment solution increased with the increase of cellulase dosage. Correspondingly, the proportion of polysaccharides on the outer surface of CSB continued to decline and eventually stabilized. These experimental results can provide a reference for improving the permeability of natural fibers and the subsequent treatment effects of biomass products. Graphical abstract The pretreatment of cotton stalk barks with cellulase destroyed the dense protective structure of cell wall, and the content of monosaccharide and lignin in the treated solution increased with the increase of cellulase dosage.

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Biodeinking of mixed ONP and OMG waste papers with cellulase

Cited by 19 publications

References 19 publications

Effects of Lipase and Xylanase Pretreatment on the Structure and Pulping Properties of Wheat Straw

Effects of Lipase and Xylanase Pretreatment on the Structure and Pulping Properties of Wheat Straw

Cellulase-assisted deinking approach for the recycling of mixed office waste papers and its quality improvement

Effects of different amounts of cellulase on the microstructure and soluble substances of cotton stalk bark

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