Extraction and Depolymerization of Lignin from Pine Sawdust and Pistachio Shells

Jadhav, Balawanthrao; Roy, Ranen; Rahman, Mustafizur; Raynie, Douglas E.

doi:10.3390/biomass2040023

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…Remarkable amount of absorbed water in both SL and PSL can be related to the hygroscopic functional groups such as phenolics forming hydrogen bonds with ambient water molecules. 79 A significant change can be observed starting from 100 o C when thermograms of SL and PSL are compared. While SL possessing a cross-linked structure showed thermal stability up to 300 o C (only ~%10 weight loss), PSL lost most of its weight (~73%) at that temperature.…”

Section: Resultsmentioning

confidence: 99%

Nature-inspired Depolymerization of Soda Lignin by Light-induced Free Radical Promoted Cleavage Using Organic Photocatalyst

Kaya

Atsay

Gündüz

et al. 2023

Preprint

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The development of sustainable valorization methods for lignin is a challenging task, because the vast majority of the reported methods require either harsh conditions or the use of expensive transition metal catalysts. Inspired from the natural-sunlight degradation of lignin, known as lignin yellowing, we report here the use of a commercially available cheap organic photocatalyst, namely, phenacyl bromide (PAB), for the efficient cleavage of lignin model compound 2-phenoxyacetophenone (2-PAP), and the depolymerization of soda pulped lignin (SL) under UV-A irradiation under ambient conditions. Real-time NMR investigations of the photoreaction between the model compound and PAB shed light on the possible reaction mechanisms involving different radical species, HBr, and molecular oxygen. Interestingly, combined spectral, chromatographic, powder X-ray diffraction and thermal studies of the photocatalytic reaction between PAB and SL indicated the formation of guaiacyl alcohol. The unprecedented catalytic performance of such a simple organic photocatalyst is attributed to the generation of phenacyl radicals, photolabile brominated species and HBr playing key roles in the cleavage of β-O-4 linkages. This study represents a new edge for lignin valorization under mild reaction conditions and offers the opportunity for large-scale environment-neutral production of valuable aromatics using technical lignins as feedstock.

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Section: Resultsmentioning

confidence: 99%

Nature-inspired Depolymerization of Soda Lignin by Light-induced Free Radical Promoted Cleavage Using Organic Photocatalyst

Kaya

Atsay

Gündüz

et al. 2023

Preprint

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show abstract

“…Remarkable amount of absorbed water in both SL and PSL can be related to the hygroscopic functional groups such as phenolics, forming hydrogen bonds with ambient water molecules. [ 37 ] A significant change can be observed starting from 100 ο C when thermograms of SL and PSL are compared. While SL possessing a cross‐linked structure showed thermal stability up to 300 ο C (only ≈%10 weight loss), PSL lost most of its weight (≈73%) at that temperature.…”

Section: Resultsmentioning

confidence: 99%

Nature‐Inspired Depolymerization of Soda Lignin: Light‐Induced Free Radical Promoted Cleavage of β‐O‐4 Bonds

Kaya,

Atsay,

Gunduz

et al. 2023

Advanced Sustainable Systems

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The development of sustainable valorization methods for lignin is a challenging task because the vast majority of the reported studies involve either harsh conditions or expensive transition metal catalysts. Inspired by the sunlight degradation of lignin compounds, known as lignin yellowing, the use of a commercially available cheap organic photoinitiator, namely, phenacyl bromide (PAB) is reported here, for the efficient cleavage of lignin model compound 2‐phenoxyacetophenone (2‐PAP) and for the depolymerization of soda pulped lignin (SL) under UV‐A irradiation and ambient conditions. Real‐time NMR investigations of the photoreaction between 2‐PAP and PAB shed light on the possible reaction mechanisms involving different radical species, HBr, and molecular oxygen. Interestingly, combined spectral, chromatographic, powder X‐ray diffraction, and thermal studies of the photoreaction between PAB and SL indicate the formation of guaiacyl alcohol as the main product. The unprecedented performance of PAB is attributed to the excess generation of phenacyl radicals, the generation of photolabile brominated species, and HBr playing key roles in the cleavage of β‐O‐4 linkages. This work represents a new edge for sustainable lignin valorization under mild reaction conditions and offers the opportunity for large‐scale production of valuable aromatics using technical lignins as feedstock.

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“…Additionally, the nipa frond biomass is comprised of the organic compounds lignin, hemicellulose, and cellulose. Nevertheless, regulating the influence of environmental variables on the biomass composition poses an arduous challenge due to their susceptibility to the fluctuations in weather patterns, water availability, temporal and spatial temperature differentials, and soil properties (11) . The chemical composition of nipa frond biomass collected from Pasuquin, Ilocos Norte.…”

Section: Initial Biomass Analysis Of Extractive-free Nipa Frond Biomassmentioning

confidence: 99%

Isolation of a - Cellulose from Nipa ( Nypa fruticans Wurmb) Frond using Physico-Chemical Treatment

Cariaga,

Domingo,

Santos

et al. 2023

IJST

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Objective: The aim of this research is to create a versatile approach to produce cellulose from nipa fronds, which are a sustainable resource. Methods: The study focuses on determining the amount of cellulose in nipa fronds, the effectiveness of a simplified physicochemical pretreatment, and the purity of the isolated nipa α-cellulose. The nipa biomass was pretreated using physical and chemical methods and analyzed through gravimetric analysis to determine its composition, delignification efficiency at varying concentrations of Sodium hydroxide (NaOH), and the purity of the isolated nipa α-cellulose (iNαC) using the National Renewable Energy Laboratory (NREL) protocol, "NREL/TP-510-42618". The data was statistically analyzed using One-way Analysis of Variance. Findings: The results showed that increasing the concentration of NaOH led to positive responses in delignification, decreased hemicellulose, and increased recovery of cellulose. The study found that as the concentration of NaOH increased, the amount of α-cellulose recovered also increased. Treatment 4 (15% NaOH) and Treatment 2 (10% NaOH) produced 79% w/w and 77.45% w/w of α-cellulose, respectively. While Treatment 4 was highly effective in breaking down nipa biomass, a statistical analysis revealed that Treatment 2 produced comparable results in terms of producing pulp from nipa frond biomass without requiring higher concentrations of NaOH. This led to a reduction in chemical waste, making Treatment 2 a more sustainable option.

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Extraction and Depolymerization of Lignin from Pine Sawdust and Pistachio Shells

Cited by 7 publications

References 29 publications

Nature-inspired Depolymerization of Soda Lignin by Light-induced Free Radical Promoted Cleavage Using Organic Photocatalyst

Nature-inspired Depolymerization of Soda Lignin by Light-induced Free Radical Promoted Cleavage Using Organic Photocatalyst

Nature‐Inspired Depolymerization of Soda Lignin: Light‐Induced Free Radical Promoted Cleavage of β‐O‐4 Bonds

Isolation of a - Cellulose from Nipa ( Nypa fruticans Wurmb) Frond using Physico-Chemical Treatment

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