CARBOHYDRATE POLYMERS
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2023
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IF 11.2
Jiran Dong,Jinsong Zeng,Pengfei Li,Jinpeng Li,Bin Wang,Jun Xu,Wenhua Gao,Kefu Chen
Lignin-containing cellulose nanopapers are emerging multifunctional materials in the fields of coatings, films, and packaging. However, the forming mechanism and properties of nanopapers with various lignin content have not been thoroughly studied. In this work, a mechanically strong nanopaper was fabricated based on lignin-containing cellulose micro- and nano-hybrid fibrils (LCNFs). The influence of lignin content and fibrils morphology on the formation process of nanopapers was investigated to understand the strengthening mechanism of nanopapers. LCNFs with high lignin content provided nanopapers with intertwined micro- and nano-hybrid fibrils layers with small layer spacing, while LCNFs with low lignin content offered nanopapers interlaced nanofibrils layers with large layer spacing. Although lignin was expected to interfere with hydrogen bonds between fibrils, the uniformly distributed lignin contributed to the stress transfer between fibrils. Due to the good coordination between microfibrils, nanofibrils and lignin (as network skeleton, filler and natural binder, respectively), the well-designed LCNFs nanopapers with lignin content of 14.5 % showed excellent mechanical properties, including tensile strength (183.8 MPa), Young's modulus (5.6 GPa) and elongation (9.2 %). This work deeply reveals the relationship between lignin content, morphology and strengthening mechanism of nanopapers, and providing theoretical guidance for employing LCNFs as structural and reinforcing materials to design robust composites.
研究领域:
材料科学
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林业工程
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生物质材料
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PubMed
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Nano Research
·
2023
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IF 9.9
Liu Guangyong,Lu Yumiao,Lu JunFeng,Wang Yanlei,Liang Shijing,He Hongyan,Jiang Lilong
Electrocatalytic depolymerization of lignin into value-added chemicals offers a promising technique to make biorefining sustainable. Herein, we report a robust trimetallic PdNiBi electrocatalyst for reductive C-O bond cleavage of different lignin model dimers and oxidized lignin under mild conditions. The reduction reaction proceeds with complete substrate conversion and excellent yields toward monomers of phenols (80%–99%) and acetophenones (75%–96%) in the presence of an ionic liquid electrolyte with operational stability. Systematic experimental investigations together with density functional theory (DFT) calculations reveal that the outstanding performance of the catalyst results from the synergistic effect of the metal elements, which facilitates the easier formation of a key C α radical intermediate and the facile desorption of the as-formed products at the electrode. The results open up new opportunities for lignin valorization through the green electrocatalytic approach.
研究领域:
化学工程
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可再生能源
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Haohe Huang,Chaojian Zheng,Chongxing Huang,Shuangfei Wang
Lignin is regarded as a potential solution for boosting the strength of cellulose-based products. However, the mechanism of co-solubilization for lignin and cellulose has not been investigated. In this study, the effect of lignin content on the interaction between lignin and nanocellulose during lignin/cellulose co-dissolution was examined. The results revealed that lignin binds to nanocellulose throughout the dissolution process to limit the degradation of cellulose and to prepare nanocellulose/lignin composites. Moreover, the S units in lignin were more likely to interact with cellulose during the dissolution process, whereas the G units were more likely to condense. However, when the lignin content exceeded 30 wt%, the excess lignin created a severe condensation reaction, which led to a decrease in the lignin content bound to cellulose, resulting in an unequal dissolution of cellulose. Thus, a small amount of lignin attached to cellulose during the co-dissolution of lignin and cellulose inhibits cellulose degradation and can be utilized to create nanocellulose/lignin to extend the potential applications of nanocellulosic materials.
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Nature Geoscience
·
2025
·Vol. 18
·期 9
·877-884
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IF 16.1
Liu Tuo,Li Lingyan,Xue Kai,Wang Xuemeng,Li Huiju,Wang Yanfen,Dong Xiuzhu
Lignin is a natural plant polymer that accounts for about one-third of the organic carbon in the biosphere. Global warming has led to shrub encroachment and increased lignin input into peatlands. Generally, lignin is recalcitrant to microbial degradation in anoxic environments. Here we report methane production from lignin and its constituent monophenols in a flooded peatland in China based on microcosm experiments. Methane production was higher in the moderate shrub-covered peatland soils that have greater lignin contents compared with those of herb-covered soils. Adding lower contents of lignin and its monophenols promoted methane production of herb soil microcosms, and lignin contributed approximately 1.2–14.2% of the total methane emissions. Isotope tracing and dynamic metabolomic analyses revealed that the methoxy group of vanillin was first converted to methane, and then the aromatic ring carbons were fermented into CO 2 , acetate, propionate and (iso)butyrate. Lignin and its monophenols enriched the methylotrophic methanogens Methanomassiliicoccus and Methanosarcina , suggesting their involvement in methoxydotrophic methanogenesis. We suggest that lignin should not be overlooked as a source of methane in peatlands, especially given increasing shrub encroachment under global warming.
研究领域:
生物地球化学
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微生物生态学
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环境微生物学
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气候变化
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土壤科学
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Cell Reports Physical Science
·
2022
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IF 7.832
Mingming Yang,Hailong Li,Jing Shen,Shujun Li,Shouxin Liu,Jian Li,Zhijun Chen,Meng Li,Tony D. James
Lignin is a significant byproduct from the pulp and paper industry. However, the conversion of lignin to a resource with added value is plagued by expensive processing. Here we report that the syringyl units (S) of sodium lignosulfonate (LS) exhibit phosphorescence in water with a lifetime of ∼2 ms and the lifetime can be prolonged up to ∼618 ms by encapsulation in Ca 3 (PO 4 ) 2 due to the formation of H-type dimers of the S units (LS@Ca 3 (PO 4 ) 2 ). Motivated by this, we develop afterglow paper through the in situ generation of LS@Ca 3 (PO 4 ) 2 in the paper matrix. The afterglow emission of the paper is sensitive to H 2 O 2 , enabling its application as a sensor for liquid/vapor H 2 O 2 . Moreover, the afterglow paper is shown to be suitable for use in anti-counterfeiting applications, enabling the development of a more sustainable pulp and paper industry.
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COMPOSITES COMMUNICATIONS
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2020
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IF 4.915
Dong Wang,Yang Wang,Wei Wang,Ting Li,Jie Jiang,Bihua Xia,Pingming Ma,Minqing Chen,Weifu Dong
For many years, it has remained a hot topic to create a ductile polylactic acid (PLA) composite, especially by the modified lignin. Herein, we demonstrated a facile method for modified alkaline lignin (LMP) which was a toughener for PLA in the presence of polyethylene glycol 400 (PEG400). The mechanical tests showed that in addition to a high extensibility of 328.8%, as-designed PLA/PEG400/LMP ternary blend exhibited excellent toughness of 65.4 MJ·m −3 and high notched impact strength of 10.9 kJ·m −2 , which were respectively 12 and 2 folds of those of neat PLA. Moreover, the toughening mechanism of LMP particles in PLA composites from the morphology study was demonstrated. More importantly, it was meaningful to turn industrial waste lignin into wealth.
研究领域:
材料科学
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生物化学
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INDUSTRIAL CROPS AND PRODUCTS
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2018
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IF 3.849
Lisha Zhao,Xinping Ouyang,Guanfeng Ma,Yong Qian,Xueqing Qiu,Tao Ruan
Alkali lignin (AL) was depolymerized by hydrogenation using Pd/C as the catalyst and formic acid as the hydrogen donor, and the antioxidant activity of hydrogenolysis products of alkali lignin (HPAL) was investigated. It was found that when the degree of depolymerization (DD) was 85.0%, the IC 50 of HPAL reached 25.2 ± 0.9 mg L −1 in terms of the DPPH radical scavenging activity, which was better than both AL (63.5 ± 0.6 mg L −1 ) and commercial antioxidant BHT (38.7 ± 1.0 mg L −1 ). There was a tight relationship between DD and antioxidant activity, indicating that a lower molecular weight of HPAL was beneficial for improving the antioxidant activity. The hydrogenolysis of lignin contributed to an obvious increase of phenolic hydroxyl content which was the essential for antioxidant activity, and hence hydrogenolysis improved the antioxidant activity of HPAL although the methoxyl content decreased slightly. In addition, phenolic structures with para -alkyl had higher antioxidant activity than those without alkyl substituent. However, the antioxidant activity of the phenolic compounds gradually decreased with an increase of the alkyl chain in para -position due to its lower solubility in a polar solvent. The significant improvement of antioxidant activity of lignin after hydrogenolysis may provide a promising approach to high valued utilization of lignin.
研究领域:
林产化学
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生物化学
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CHINESE CHEMICAL LETTERS
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2015
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IF 1.587
Xin-Ping Ouyang,Yun Yang,Guo-Dian Zhu,Xue-Qing Qiu
The lack of suitable lignin model compound limits the understanding of the characteristics of lignin, and hence hinders the efficient utilization of this kind of bioresource. A tetramer phenolic lignin model compound composed of 5-5, α - O -4 and β -5 linkages was prepared by a two-step of free radical reaction with hydrogen peroxide/horseradish peroxidase and S 2 O 8 2− /Fe 2+ as the initiator. Compared with enzymatic process, this synthetic process gives a higher yield of 33.8% within a shorter time. HRMS and 13 C NMR spectroscopy show that synthesized model compound contains phenylpropane structure linked by 5-5, α - O -4 and β -5 bonds, which can mimic some chemical characteristics of lignin.
研究领域:
生物化学
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材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Haonan Xue,Haihong Xia,Hui Li,Fei Ge,Wei Xu,Xiaohui Yang,Minghao Zhou
Lignin represents a significant source of aromatic hydrocarbons in the natural world. The production of high-value chemicals from lignin has the great potential to effectively address the issue of fossil energy scarcity. In this study, complex sulfides of nickel‑cobalt bimetallic catalysts were prepared via hydrothermal synthesis and subsequently employed in the catalytic hydrogenolysis of C O bonds present in lignin. A series of complex sulfides Ni 3 S 2 /Co 3 S 4 -CS n -x-T derived from lignin-MOF ( n = 0.5, 1, 1.5 and 2; x = 2, 4 and 6; T = 400, 500, 600 and 700 °C), were prepared under different conditions and subsequently employed in the catalytic hydrogenolysis of lignin model compounds. The optimal catalyst Ni 3 S 2 /Co 3 S 4 -CS 1 –4-500 exhibited the highest conversion rate of benzyl phenyl ether (BPE) (about 97.3 %), and the yields of toluene and phenol produced were 49.5 % and 43.6 %, respectively with isopropanol as the reaction solvent and no external H 2 . The introduction of element sulfur in catalysts could effectively inhibit the further hydrogenation of generated aromatic chemicals. The catalysts were well characterized, and the results demonstrated that the catalysts exhibited high catalytic activity with an increased loading of active components. This study provided some novel findings for the construction of biomass-based catalysts and the production lignin-derived aromatic chemicals.
研究领域:
生物质化学
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催化材料科学
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yujie Zhang,Changjian Wang,Jun Liang,Mengmeng Wang,Yingjuan Fu,Yongchao Zhang,Guoyu Tian,Zhaojiang Wang
This study explored the synthesis of lignin-polyol (LP) by liquefaction of Kraft lignin in polyethylene glycol and glycerol. LP23 (23 wt% lignin) and LP41 (41 wt% lignin) were obtained with remarkable liquefaction yields of 97.43 % and 93.75 %, respectively. LP-based polyurethane film (LP-PUF) was then fabricated by reacting LP23 and LP41 with hexamethylene diisocyanate. Mechanical properties and hydrophobicity of LP-PUF were optimized by varying NCO/OH molar ratios. LP23-PUF1.9 with NCO/OH of 1.9 showed excellent tensile strength of 34.28 MPa and Young's modulus of 233.27 MPa, while LP41-PUF2.0 with NCO/OH of 2.0 exhibited good tensile strength of 26.03 MPa and Young's modulus of 260.66 MPa. LP23-PUF2.0 displayed high hydrophobicity as indicated by the water contact angle of 96.8° and low surface free energy of 15.68 mN/m. Glass transition temperature (Tg) of LP-PUF varied depending on lignin content and NCO/OH molar ratio. Specifically, the increase of KL content from 23 % to 42 % induced big rise of Tg by 8 °C. The NCO/OH induced change of Tg was relatively weak, as indicated by the small increase of −2.71 °C of LP41-PU1.4 to −1.81 °C of LP41-PUF2.0. The results of this work offer insights for lignin utilization as structural component of high modulus and high strength polyurethane film.
研究领域:
材料科学
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化学工程
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高分子科学
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Qiyu Liu,Jiayue Lu,Lili He,Jingyu Wang,Haiping Guo,Junhao Long,Liheng Chen,Xueqing Qiu
Industrial lignin is an underutilized resource from the pulping industry due to its high heterogeneity. The transformation of industrial lignin into monodispersed lignin colloidal spheres (LCSs) for the preparation of advanced biomass photonic materials is particularly appealing, because of their unique biocompatibility. However, the LCSs synthesized from industrial lignin generally show a wide size distribution and thus limit this specific application. To address the issue, selective functionalization was carried out to convert phenolic and aliphatic −OH groups into ester groups, decreasing the LCS size distribution to a monodispersing degree. Simulation analysis revealed that the functionalization had narrowed the difference of C–O linkage electron cloud distribution and led to a lignin polarity decrease. Additionally, atomic force microscopy (AFM) quantification of lignin proved a force distribution index (FDI) decrease from 0.38 to 0.11, which was consistent with the LCS polymer dispersity index (PDI) decrease from 0.182 to 0.05. The photonic materials can be readily prepared from monodispersed LCSs with the color precisely adjusted by controlling LCS particle sizes.
研究领域:
材料科学
·
林业工程
·
化学工程
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PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Wang Xiang,Sien Yan,Weijie Wang,Ningwei Yang,Yan Wang,Tingting Kang,Linhuo Gan
As a high-quality carbon source, this study employed the gradient acid precipitation method to separate and extract bamboo lignin (BL) fractions from alkaline pulping black liquor, aiming to investigate the influence of BL fraction on the yield of lignin-derived carbon supported tin oxide (SnO x /LC) and its catalytic performance in the conversion of glucose to 5-hydroxymethylfurfural (5-HMF), utilizing various testing methods for detailed characterization. The characterization results revealed that SnO x /LC-2 was thermally stable with both Lewis acid and Brønsted acid sites, and the Sn element was uniformlmly dispersed on carbon carrier surface. In addition, with decreasing pH of black liquor, the molecular weight and polydispersity of BL fraction were significantly reduced, and its structural homogeneity was effectively improved. More importantly, the relative content of syringl unit and the content difference between phenolic hydroxyl and carboxylic acid groups in the structure of BL fractions both showed linear negative correlations with 5-HMF yield, which revealed the constitutive relationship between the molecular structural features of lignin and the catalytic performance of SnO x /LC, thus contributing to the high-value utilization of industrial lignin.
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