CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Tianyu Ren,Shengping You,Muyuan Zhang,Yuefei Wang,Wei Qi,Rongxin Su,Zhimin He
Herein, the lignin-to-fuel conversion process was studied using real lignin as feedstock. Unlike model compounds, real lignin poisons the catalyst, causing rapid deactivation. The problem of catalyst deactivation was analyzed in detail for improving the conversion efficiency. We found that heavy carbonaceous deposits on the inner surface of the catalyst were responsible for the fast deactivation encountered in the conventional one-step reaction process. Moreover, the ester structures in lignin, which have previously been neglected in research, were confirmed to considerably worsen catalyst deactivation because they induce easier polymerization and hinder lignin conversion. Based on these points, we developed a three-step method that eliminates serious catalyst deactivation in the lignin-to-fuel conversion process, involving depolymerization of lignin, extraction of lignin monomers and hydrodeoxygenation of lignin monomers. The fuel production was 8.1–17.6-times more efficient using this three-step method than using the one-step batch reaction.
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DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 14
·7911-7927
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IF 4.21
Li Mingfu,Yi Liu,Bin Luo,Zhang Qingtong,Song Junlong,Jiang Hongrui,Chen Changzhou,Wang Shuangfei,Min Douyong
Lignin, as a main factor inhibiting the enzymatic hydrolysis of lignocellulose, was investigated by comparing lignin isolated from untreated and pretreated lignocellulose to elucidate the differences in the enzyme adsorption ability. The nonproductive adsorption of cellulase on lignin was investigated by using a quartz crystal microbalance with dissipation. The results indicated that more cellulase adsorbed on the lignin isolated from autohydrolysis and green liquor-pretreated lignocellulose than on protolignin. Higher temperature and enzyme concentration increased the initial adsorption rate and the amount of enzyme adsorbed on lignin. A dynamic equation for enzyme adsorption on lignin was established. The adsorption of enzymes on lignin increased as the content of phenolic hydroxyl groups, and β-β and β-5 linkages in the lignin increased, attributed to enhanced hydrogen bonding and hydrophobic interaction. Consequently, inhibition of the enzymatic hydrolysis of cellulose was promoted by a higher phenolic hydroxyl group, β-β, and β-5 content. The adsorption of the enzyme components on lignin followed the order: β-glucosidase > xylanase > endo -glucanase > cellobiohydrolase, as revealed by polyacrylamide gel electrophoresis analysis. Electrostatic interaction increased the adsorption of β-glucosidase and xylanase on lignin, while synergistic hydrophobic interaction and hydrogen bonding increased the adsorption of endo -glucanase and cellobiohydrolase on lignin. The results indicate that the adsorption of enzymes on lignin is affected by the structure of lignin and the composition of the enzymes. The findings of the current study provide fundamental knowledge for improving the enzymatic conversion of lignocellulose.
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高影响因子
FUEL
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2018
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IF 4.908
Cheng Chen,Dongxue Jin,Xinping Ouyang,Lisha Zhao,Xueqing Qiu,Furong Wang
The structure of lignin is one of the key factors affecting its depolymerization into phenolic monomers . Four lignin fractions with different molecular weight were obtained by using ultrafiltration membrane technology , and the characteristics of lignin factions with different molecular weight were determined by gel permeation chromatography (GPC), potentiometric titration , FT-IR and NMR. It is found that wheat alkali lignin with low molecular weight contained more content of phenolic hydroxyl , methoxyl function groups, and β-O-4 linkages, which was relatively prone to depolymerize into phenolic monomers with a higher yield, although the more content of carbonyl was reported to facilitate the depolymerization of lignin. With the increase of molecular weight of lignin, the depolymerization was more difficult, and the YMC decreased. Lignin fraction with low molecular weight was favorable for depolymerization into syringyl and alkyl syringyl, while the high molecular weight lignin was prone to depolymerize into guaiacyl and alkyl guaiacyl products. Boric acid was proved effective to avoid repolymerization and improve the YMC, and the dosage of boric acid was determined by the content of hydroxyl groups in lignin.
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高影响因子
Journal of Cleaner Production
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2022
·
IF 11.072
Bin Wang,Xue-Fei Cao,Shi-Xin Yu,Zhuo-Hua Sun,Xiao-Jun Shen,Jia-Long Wen,Tong-Qi Yuan
The complex pollutants in wastewater, especially the highly toxic and carcinogenic azo-dyes, seriously endanger the water ecosystem and human health. Using renewable lignin to develop efficient flocculants is of great significance to environmental sustainability. Nevertheless, the preparation process of lignin-based flocculant is not only inefficient and cumbersome, but also brings serious pollution, making their development unsustainable. In this study, a new type of ultra-efficient Mannich-functionalized lignin-based flocculants was prepared by a simple, green strategy. Lignin-based flocculants were synthesized by copolymerizing lignin with acrylamide in a UV-induced aqueous copolymerization system and then modified by Mannich with formaldehyde and diethylenetriamine. Comprehensive considering the influence of molecular weight , charge density and amphiphilicity, herein, two different types of lignin-based flocculant (LBF1 and LBF2) could be precisely tuned by adjusting the dose of formaldehyde and diethylenetriamine. The results showed that the turbidity removal rate of LBF1 for kaolin suspension could be up to 99.31%, and the decolorization rate of Acid Black 1, Direct Red 80 and Reactive Red 2 solutions using LBF2 was more than 99.60%, which outperformed almost all other lignin-based flocculants reported in the previous reports. Moreover, LBF1 and LBF2 showed excellent resistance to the complex external environment, reflecting their outstanding universality.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Guochen Xia,Shixu Yu,Zezhou Yang,Jingyi Lian,Yimin Xie,Qinghua Feng
Natural wood has been highly valued for thousands of years due to its excellent strength, low density, and ease of processing. However, its poor water stability, which leads to swelling and deformation, limits its competitiveness. In response, we designed a reconstructed wood through a process involving pretreatment, TEMPO oxidation, lignin self-assembly, lignin melting, and densification. In this material, cellulose serves as the skeleton, while lignin with a phenylpropyl structure acts as both a filler and binder. The resulting wood exhibits outstanding water stability, with no changes after 60 days of water immersion and a water absorption rate as low as 8.32 %. This stability is achieved through the densification of lignin, which is enhanced by lignin melting and pressure during self-assembly. The reconstructed wood not only offers excellent water stability but also boasts superior UV resistance and thermal stability. Additionally, it can be hot-pressed into straws within a mold, providing better water stability and tensile strength compared to paper straws. This reconstructed wood, made from natural wood and corncob, is biodegradable and environmentally friendly, offering a new approach to wood water stability strategies.
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
·
IF 3.9
Fangbao Fu,Zhou Huang,Shuoyang Qiu
The low-cost and high-capacity SiOx is widely recognized as an ideal anode material for lithium storage; however, the challenges of low conductivity and significant volume expansion still need to be addressed. In this work, we incorporated SiOx into a lignin-derived carbon material with an elevated nitrogen content through a step-by-step carbonization strategy. Initially, the electrostatic assembly facilitated the formation of a complex comprising modified lignin and SiO2, which was subsequently subjected to carbonization and etching steps. Finally, due to zinc species inhibiting nitrogen decomposition, the cocarbonization of the lignin porous carbon/SiOx complex, zinc oxalate, and melamine enabled the construction of a nitrogen-enriched carbon/SiOx composite. The resulting carbon/SiOx composite exhibited a moderate specific surface area, abundant mesoporous channels, and an exceptionally high nitrogen doping content of 17.91 at. %. These characteristics effectively enhanced the storage and transportation of lithium ions while mitigating the volume expansion. As anodes in half batteries, the reversible specific capacity of the optimized carbon/SiOx reached 894 mAh/g during stable cycles, which was attributed to the enhanced ion diffusion rate and storage kinetics resulting from the high nitrogen content as well as the improved structural stability due to the encapsulated structure. Furthermore, the assembled lithium-ion capacitor demonstrated an energy density of 82 Wh/kg and maintained a capacity retention rate of 93.1% after undergoing 15,000 cycles. This work presents a novel concept for the synthesis of nitrogen-rich carbon matrixes but also offers insights into the structural optimization of silicon-based negative electrodes using green biomass.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2024
·
IF 5.6
Wenbin Zhang,Xiangsheng Han,Zhiqiang Qi,Hao Tan,Keyan Yang,Hongzhen Cai
Lignin-containing cellulose nanofibers (LCNFs) with promising sustainability and multiple functionalities are highly in demand while still limited by the high energy consumption and potential environment disruption in preparation. In this work, the super-base system (dimethyl sulfoxide/potassium hydroxide, DMSO/KOH) was firstly employed as pseudosolvent to swell melon vine powder by partially remove some non-cellulose components (such as extraction, lignin and ash) in plant cell wall, and facilitate the following production of LCNFs. Due to the strong nucleophilicity of DMSO/KOH, universal swollen effects toward corn husk , poplar, bagasse , rice husk, and cotton stalk were achieved, and the LCNFs from them were also successfully obtained (with yields of ∼78.75%, 55.60%, 51.33%, 46.13%, and 53.90%, respectively). Besides, this method resulted in high lignin content among LCNFs (∼19.54%), which endowed the resultant membranes with superior mechanical strength, thermal stability, and dye rejection performance (a rejection rate of ∼92.7%, and a flux of 15.16 L•m -2 •h -1 •bar -1 toward methyl violet at 250 ppm). Thus, this research paves a simple, efficient, and universal way to prepare LCNFs from various biomass.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Long Li,Hai-Lin Wei,Wen-Lei Wang,Ping-Hu Zhang,Fei Jing,Yong-Hong Zhou,Xiao-Hui Yang
Lignin, a renewable natural antioxidant and bacteriostat, holds promise as a versatile, cost-effective feed additive. However, traditional industrial lignin faces limitations, including low reactivity, poor uniformity, and unstable properties, necessitating chemical modification. Complex modification methods pose economic and toxicity challenges, so this study adopted a relatively simple alkali-catalyzed phenolization approach, using phenol, catechol, and pyrogallol to modify kraft lignin, and characterized the resulting products using various techniques. Subsequently, their antioxidant, antibacterial, adsorption properties for heavy metal ions and mycotoxins, growth-promoting properties, and antiviral abilities were assessed. The phenolation process led to lignin depolymerization and a notable increase in phenolic hydroxyl content, particularly in pyrogallol-phenolated lignin (Py-L), rising from 3.08 to 4.68 mmol/g. These modified lignins exhibited enhanced antioxidant activity, with over 99 % inhibition against E. coli and S. aureus , and remarkable adsorption capacities for heavy metal ions and mycotoxins. Importantly, Py-L improved the growth performance of mice and reduced influenza mortality. Furthermore, density functional theory calculations elucidated the mechanism behind the enhanced antioxidant properties. This study presents a promising avenue for developing versatile feed additives to address challenges related to animal feed antioxidant supplementation, bacterial control, and growth promotion.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
·
IF 21.1
Yun Tian,Jie Qu,Kejia Wu,Mengqiao Gao,Jinxing Long,Qiang Zeng,Wei Qi,Xuehui Li
Conversion of lignin to value-added chemicals with endogenous hydrogen is of great significance but highly challengeable. In this work, an external hydrogen-free strategy has been proposed for aqueous transfer hydrogenolysis of lignin launched by the chemo-splitting of water using a series of Ni-Co bimetallic catalysts. With Ni 0.2 Co 0.1 -MgAl-LDO, 82.7 % of lignin conversion was achieved, affording a 20.8 % yield of monophenols, and 62.0 % of which was identified as 4-ethylphenol (yield of 12.9 %). Further investigations demonstrated that the lignin hydrogenolysis was triggered by the water splitting, and enhanced by the tandem demethoxylation and subsequent aqueous reforming reaction. Intensive characterizations using TEM, XPS and XAFS, etc, illustrated that the formation of highly dispersed Ni-Co alloy nanoparticles exhibited a strong metal-support interaction with MgAl-LDO. The electronic transfer effect between Ni and Co components and the strong basic sites are responsible for its excellent catalytic performance of Ni 0.2 Co 0.1 -MgAl-LDO on the lignin hydrogenolysis. Therefore, this work provides novel insight into the catalytic transfer hydrogenolysis of lignin.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Ruige Qi,Meng Zhang,Yijiao Xue,Lihong Hu,Caiying Bo,Yonghong Zhou,Hailong Wang
Photothermal elastomers are intelligent soft materials that can rapidly and efficiently convert light energy into heat energy, and it is crucial to develop sustainable smart photothermal conversion materials using natural resources in the context of sustainable resources, carbon neutrality, and environmental protection. In this study, a high-content lignin-based polyurethane (LPU) photothermal elastomer was synthesized via a one-pot method by utilizing the unmodified membrane-filtered kraft lignin. The resulting LPU achieves high mechanical strength (25.6 MPa), toughness (51.8 MJ·m −3 ) and Young's modulus (692.0 MPa) due to the combination of abundant hydrogen bonds, crosslinked network and microphase-separated structure. Additionally, the presence of phenolic groups and conjugated structures in lignin endows LPU with a combination of desirable properties, including dual-mode photothermal conversion (both Xenon cold light and near-infrared) and excellent thermoresponsive and photoresponsive shape memory performance (a shape recovery rate of up to 99.9 %), which further broaden the potential applications of LPU in photothermalelectirc generators, light-controlled programmable shape memory, smart labels, and photothermal energy harvesters. This work provides a facial and green method for synthesizing a high-content lignin-based polyurethane that have great prospects in photothermal fields.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Zilin Zhao,Wangxi Fang,Youcai Chen,Shoujian Gao,Yuzhang Zhu,Jian Jin
Lignin, the second most abundant biomass resource, is widely utilized across various industries. Lye extraction is a prevalent approach for extracting lignin, but it needs to consume a lot of acid to neutralize the lye and precipitate the lignin products, resulting in a tremendous waste of acid and alkali. Direct separation of lignin and lye through nanofiltration technology can significantly reduce the consumption of acid and alkali. However, the development of nanofiltration membranes with sufficient alkali resistance for processing lignin and lye remains a challenge. Herein, we report the fabrication of polytertiary amine (PTA) nanofiltration membranes with exceptional alkali resistance via interfacial polymerization of piperazine and 1,3,5-tris-bromomethyl-benzene. PTA membranes maintained stable nanofiltration performance after immersion in alkaline solutions for 30 days and exhibited nearly unchanged lignin rejection even in NaOH solutions with concentrations of up to 5 mol L −1 . During the separation of lignin and lye, PTA membranes demonstrated high lignin rejection of 95 % and low NaOH rejection below 15 %, along with a high water permeance of 14 L m −2 h −1 bar −1 . Quantitative lignin/lye separation using the PTA membrane achieved 80 % recovery of the lye with a NaOH purity of 98.4 %, simultaneously concentrating the lignin sixfold. This work opens a new approach to developing durable nanofiltration membranes for sustainable lignin extraction and separation applications in alkaline environments.
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高影响因子
Materials Horizons
·
2025
·
IF 10.7
Qinfu Lu,Xinyue Wang,Miaoya Zhang,Zhen Wang,Xianan Qin,Baochang Sun,Shanshan Lv
Macroscopic assembly has been investigated to construct appealing materials. But it seems a question remains to be answered, i.e., is macroscopic assembly always one by one? In this study, a new kind of silk-based hydrogels were developed through incorporating lignin-related compounds via the 1-ethyl-3-(3-pyl)-carbodiimide/N-hydroxysuccinimide (EDC/NHS)-mediated coupling chemistry. Thanks to the hydrogen bond, hydrophobic and π-π interactions, the hydrogels processed capability of adhesive and macroscopic assembly, which could be further tuned by introducing iron ions, as Fe^(3+) can form coordination bonds with lignin. Examination on the three-body macroscopic assembly behavior of the silk/lignin-based hydrogels was conducted as an approach towards answering the above question. Under experimental conditions tested in this study, the answer is yes. Yet it would be reckless to draw a definitive conclusion to the question. This study intended to draw attention to this matter and evoke more interests and investigations using various macroscopic assembly systems.
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PubMed
高影响因子
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