Chemical Study of Kraft Lignin during Alkaline Delignification of<i>E. urophylla</i>x<i>E. grandis</i>Hybrid in Low and High Residual Effective Alkali

Ribeiro, Robisnéa A.; Júnior, Sílvio Vaz; Jameel, Hasan; Chang, Hou‐min; Narron, Robert; Jiang, Xiao; Colodette, Jorge Luiz

doi:10.1021/acssuschemeng.8b06635

Cited by 6 publications

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References 39 publications

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“…Delignification via alkaline conditions is the most frequently used method to remove lignin from biomass, such as in traditional pulping processes. [81][82][83] Lignin solubility is significantly higher in alkaline media compared to (neutral) water media, where it is insoluble. This is due to the phenolic OHgroups deprotonation present in lignin.…”

Section: Delignification Of Woodmentioning

confidence: 99%

Delignified Wood from Understanding the Hierarchically Aligned Cellulosic Structures to Creating Novel Functional Materials: A Review

Kumar

Jyske

Petrič

2021

Advanced Sustainable Systems

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performance environmentally friendly materials. This is because new processes will be required that allow control on all hierarchical levels. Wood is well defined as a biological engineering material with a complex hierarchical structure of organic material based on cellulose fibrils embedded in a matrix of hemicelluloses and lignin. [1,2] Wood has long been used as a construction material, as well as for pulp and paper production. These applications are highly dependent on the properties of lignin in wood. Removal of lignin is the key step in pulp and paper production, in addition to the conversion of biomass to liquid biofuels. Lignin was first discovered in wood by Anselme Payen in 1839, [3] as the incrusting material that must be removed to isolate the useful fibers in wood. Research pertaining to wood nanotechnology or functional wood materials is a rapidly emerging field. Functional wood materials are mostly fabricated by treating hierarchical natural templates (wood cell wall) by chemical and thermal means. These treatments selectively modify the wood cell wall structure (fine pore spaces and inner lumen surface area) for different applications. [4] The pore region and inner lumen surface have actively been modified to enhance the bulk properties of wood using organic chemicals, [5] inorganic chemicals, organic-inorganic chemicals, [6,7] and thermal methods. [8] Hybrid wood scaffolds have been prepared for diverse applications such as magnetic wood, [9,10] as well as wood-mineral and wood-metal hybrids. [11] Recent research on delignified wood (DW) has emerged from the classical pulp production method. In the preparation of DW, the embedded lignin is removed from the wood cell wall structure, while maintaining the natural hierarchical cellulosic structure. [12] Initially, DW was prepared in order to understand the unknown ultrastructure of wood cell walls. However, since 2015, research in this area has rapidly expanded to focus on the development of wood-based functional scaffolds. Within the literature, DW is predominantly prepared using alkaline delignification methods such as Kraft pulping (a mixture of sodium hydroxide (NaOH) and sodium sulfite (Na 2 SO 3 )) heated to boiling temperature), followed by bleaching using hydrogen peroxide (H 2 O 2 ) to remove the lignin. DW is chemically hydrophilic due to the presence and exposure of hydroxyl groups and possible sites for DW functionalization. DW scaffolds have been functionalized

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Section: Delignification Of Woodmentioning

confidence: 99%