INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Shengyu Wang,Weifeng Liu,Dongjie Yang,Xueqing Qiu
Highly resilient lignin-containing polyurethane (PU) foam was synthesized via using alkali lignin as a partial substitute for the petrochemical polyols. The flexible polyethylene glycol chains were first grafted onto alkali lignin, converting the phenolic hydroxyls on lignin to aliphatic hydroxyls and enhancing the reaction activity of lignin. The influence of the modified-lignin on the structure, mechanical properties and thermal stability of PU foams were analyzed. The grafted polyethylene glycol chains provided flexibility to the lignin-containing PU foams. All lignin-containing PU foams exhibited large elastic recovery higher than 93%. The compression strength of the PU foams increased with the lignin content while maintaining excellent resilient performance. This work gives a new approach for the application of biopolymer lignin in flexible and highly resilient polyurethane foams.
研究领域:
材料科学
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聚合物化学
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可持续材料
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Boyu Du,Changzhou Chen,Yang Sun,Ming Yang,Mengtian Yu,Bingyang Liu,Xing Wang,Jinghui Zhou
We reported a new approach for development of lignin-based carbon nanofibers (LCNFs) from two lignin-derived bio-oil (LB) obtained from catalytic depolymerization reaction combined with the organic solvent gradient separation process (including ethanol-soluble LB (EL) and tetrahydrofuran-soluble LB (TL)). This approach was particularly unique and translatable as it uses small molecule TL with high reactivity and low heterogeneity obtained via stalk lignin depolymerization to produce good morphologies and mechanical performances of LCNFs mixed with polyacrylonitrile under 85% high replacement rates. We first detailed characterization studies such as 2D-HSQC NMR, 31 P NMR, FT-IR, GPC , TGA and DSC were conducted to understand the properties of EL and TL. Then, the goal of the influence of EL and TL on the LCNFs morphologies and mechanical properties were accomplished by using SEM, XRD, Raman and material testing machine. As compared with EL, the TL had excellent linear structure with relatively less total phenolic–OH groups and heterogeneity, which could improve lignin structure with better alignment along PAN, and thus increased the lignin replacement rates and mechanical performances of LCNFs.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Changzhou Chen,Wei Chen,Mengqing Zhou,Yongzhi Xiong,Xialin Ji,Minghao Zhou,Liangliang Zhang,Xiaoping Rao,Jianchun Jiang
Large amount of lignin was produced annually as a byproduct in papermaking and pulping processes, the challenges in disposal methods had posed serious obstacles for advanced carbon materials and value-added chemicals. This study involved the preparation of kraft lignin (KL) loaded metal–organic framework (ZIF-67) material derived Co nanoparticles carbon using various methods to produce kraft lignin biochar-based carbon materials (Co@NPC-KLB). The novel and advanced carbon materials was utilized for lignin derived bio-oil hydrodeoxygenation to generate high value fuels and chemicals. It could achieve nearly 100 % vanillin (VAN) conversion and 88.49 % 2-methoxy-4-methylphenol (MMP) without the extra hydrogen at 240 °C in ethanol. The results demonstrated that highly active and stable Co nanoparticles, large specific surface area, smaller nano Co nanoparticles, strong metal-support interaction and rich Lewis acid sites on the surface of biochar support exhibited a positive promoting effect on VAN hydrodeoxygenation to generate MMP. Furthermore, density functional theory (DFT) also confirmed that synergistic effect of Co nanoparticles and kraft lignin biochar promoted a high adsorption energy of VAN on the surface of kraft lignin biochar, enhanced the catalytic ability of the hydrodeoxygenation process. This study provided a novel approach for utilizing kraft lignin in preparation functional catalysts, opening up new opportunities for designing efficient biochar-based materials for advanced carbon materials and high-value chemicals.
研究领域:
材料科学
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催化化学
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生物质转化
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产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 9
·967
·
IF 2.935
Si Gao,Ji Zhao,Xing Wang,Yanzhu Guo,Ying Han,Jinghui Zhou
This study focused on the structural differences of lignin after pyridine–acetic acid–water (PAW) and dioxane–acidic water (DAW) purification processes. These structural differences included the S/G ratio, condensed structure, weight-average (MW) molecular weights, β-O-4 linkages and sugar content. The chemical structure of the isolated crude lignin (CL), PAW purified lignin (PPL) and DAW purified lignin (DPL) was elucidated using quantitative13C NMR, 2D-HSQC NMR spectra, thermogravimetric analysis (TGA), gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR). The results showed that the PPL fractions contain fewer condensed structures, higher S/G ratios, more β-O-4 linkages, higher average MWand lower thermal degradation properties compared to the CL and DPL fractions. Furthermore, the PAW process was more selective in removing condensed units and enriching S-type lignin from CL compared to the DAW process. These results provide valuable information for understanding which purification process is more suitable to be applied for lignin.Keywords:lignin purification;structural recognition;condensed lignin;S/G ratio
研究领域:
植物化学
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生物质能源
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DOI
PubMed
高影响因子
ENVIRONMENTAL MICROBIOLOGY
·
2020
·Vol. 23
·期 1
·160-173
·
IF 4.933
Xiaopeng Wang,Lu Lin,Jizhong Zhou
Summary A major conundrum in the isolation of prokaryotes from open environments is stochasticity. It is especially difficult to study low abundance groups where very little biological information exists, although single-cell genomics and metagenomics have alleviated some of this bottleneck. Here, we report an approach to capture lignin-utilizing bacteria by linking a physical model to actual organisms. Extracellular enzymes, lignin degradation and cell growth are crucial phenotypes of lignin-utilizing bacteria, but their interrelationships remain poorly understood. In this study, the phenotypes of bacteria isolated from in situ lignocellulose enrichment samples in coastal waters were traced and statistically analysed. It suggested cell growth, dye-decolorizing peroxidase (DyP) and reactive oxygen species (ROS) were significantly correlated with lignin degradation, exhibiting a genus-specific property. The established models enabled us to efficiently capture lignin-utilizing bacteria and rapidly evaluate lignin degradation for Bacillus and Vibrio strains. Through the model, we identified several previously unrecognized marine bacterial lignin degraders. Moreover, it demonstrated that the isolated marine lignin-utilizing bacteria employ a DyP-based system and ROS for lignin depolymerization, providing insights into the mechanism of marine bacterial lignin degradation. Our findings should have implications beyond the capture of lignin-utilizing bacteria, in the isolation of other microorganisms with as-yet-unknown molecular biomarkers.
研究领域:
微生物学
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环境科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Guanghao Xu,Hao Sun,Xu Lin,Fulin Yang,Jingyan Liu,Defa Hou,Yuan Zou,Can Liu,Yunwu Zheng,Yanxi Lin,Fan Ren,Guanben Du
Although epoxidized natural rubber (ENR) and lignin have shown promise as components of biobased adhesives, their practical application still faces several technical challenges. The key challenge lies in promoting efficient reactions between the epoxy groups on the ENR molecular chain and the active functional groups of lignin, while avoiding complex chemical modifications or expensive catalysts, to form a stable, high-strength cross-linked network, thereby producing high-performance and environmentally friendly lignin-based adhesives. This study develops a highly reactive ENR/lignin composite adhesive system. The system uses ENR as the matrix and aminated lignin modified with silane coupling agent KH550 as the cross-linking agent, relying on the efficient reaction between epoxy groups and amino groups to achieve cross-linking. Experimental results show that the shear strength of the adhesive under dry conditions is 1.91 ± 0.20 MPa, and even after soaking in water at 63 °C for 3 h, the shear strength remains at 1.24 ± 0.04 MPa. Compared with traditional phenolic and urea-formaldehyde resins and other reported lignin-based adhesives, the ENR/aminated lignin composite adhesive not only exhibits superior bonding performance but also has stronger environmental benefits. All components are derived from renewable biomass resources, and the manufacturing process does not release formaldehyde. This work proposes a novel strategy for advancing green and efficient formaldehyde-free adhesive technologies.
研究领域:
材料科学
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高分子化学
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绿色胶粘剂
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可持续工程
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产品关联
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 17
·4005-4013
·
IF 7.804
Ying Kang,Xingmei Lu,Guangjin Zhang,Xiaoqian Yao,Jiayu Xin,Shaoqi Yang,Yongqing Yang,Junli Xu,Mi Feng,Suojiang Zhang
Graphical UV light on lignin : An efficient self-initiated radical photochemical strategy for degradation of lignin-derived aryl ethers and lignin through ionic liquids induction is developed. In the homogeneous system, the C−C/C−O bonds can be cleaved efficiently through a free-radical-mediated reaction, affording aromatic products in high yields under mild conditions. The degradation of lignin into aromatic products is very important, but harsh conditions and metal-based catalysts are commonly needed to cleave the inert bonds. Herein, an efficient self-initiated radical photochemical degradation for lignin-derived aryl ethers through ionic liquids (ILs) induction is demonstrated. The C−C/C−O bonds can be cleaved efficiently through free-radical-mediated reaction in the binary-ILs system 1-propenyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide [PMim][NTf 2 ] and the Brønsted acid 1-propylsulfonic-3-methylimidazolium trifluoromethanesulfonate ([PrSO 3 HMim][OTf]) under ambient conditions. [PMim][NTf 2 ] initiates the reaction by promoting the cleavage of the C β −H bond, and [PrSO 3 HMim][OTf] catalyzes the subsequent C−O−C bond fragmentation. Furthermore, alkyl, hydroxyl, and peroxy radicals are detected, which suggests degradation based on a photochemical free-radical process. Additionally, alkali lignin could also be degraded in the IL system. This work sheds light on sustainable biomass utilization through a self-initiated radical photochemical strategy under metal-free and mild conditions.
研究领域:
化学
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生物质能
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
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2020
·
IF 3.862
Bingqi Li,Shengping You,Wei Qi,Yuefei Wang,Rongxin Su,Zhimin He
Lignin sub-micro spheres have drawn wide attention because of their biodegradable, biocompatible and large surface area. However, the formation of stable and tunable lignin micro/nanospheres are limited by lignin source, preparation method and aggregation characteristics. Amphiphilic lignin tends to form aggregates in water under two tunable forces, including hydrophobic and hydrophilic interactions. Herein, we rationally modify the amphiphilic interface of corncob lignin (CL) with the chemical modification of four types of n-alkane to tune its amphiphilicity. Four alkylated CLs with similar chemical properties, but different interfacial interactions have been successfully synthesized. We find that n-alkane and aromatic skeleton contribute to the hydrophobic interactions to induce the aggregation of CL. The results show that modulating the hydrophobic and hydrophilic interactions can successfully promote the formation of CL sub-micro spheres (CLS) with tunable surface properties. The higher hydrophobic interactions and longer alkyl chain, the smaller size of CLS. The average diameters of CLS can be reduced from 400 nm to 100 nm by increasing the length of alkyl chain. What’s more, CLS can disperse stably in water for 60 days and in acid-base environment at pH 4–10 for 30 days.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2020
·
IF 4.982
Bingyang Liu,Boyu Du,Yang Sun,Mengni Zhu,Yingying Yang,Xing Wang,Jinghui Zhou
Lignin-first is a strategy for producing value-added phenolics and high-quality bio-oils from lignin. To contribute to this strategy, we investigated the effects of ultrasound acoustic cavitation on depolymerization of organosolv lignin to phenolic monomers and low molecular weight lignin bio-oils. We achieved the highest lignin bio-oil yield of 56.9 wt% at a temperature of 250 °C, a reaction time of 6 h, and an ultrasonic power of 90 W. Moreover, the obtained lignin bio-oils had low molecular weight, narrow molecular weight distribution and lack of ether linkages, which are the characteristics suitable as a source of liquid bio-oil fuels. Finally, the prominent phenolic monomers in liquid bio-oil, including phenol , 2-(1-methylethyl)-phenol and benzene, 1,2,3-trimethoxy-5-methyl, were identified in lignin bio-oil.
研究领域:
生物化学
·
可再生能源
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产品关联
DOI
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Liang Jiang,Guangyue Xu,Yao Fu
The conversion of lignin into value-added chemicals is one of the important ways for sustainable development. Herein, phytic acid, a biomass-derived chemical, was used as the phosphorus source and pore former to synthesize the AlPyOx support. After loading Ni, the Ni/AlPyOx catalysts were found to be highly active in the catalytic conversion of lignin model compounds to high-value-added chemicals under mild conditions. The benzyl phenyl ether (α-O-4 lignin model compound) could be completely converted into toluene and phenol with near-equivalent selectivity at 30 °C and 3 MPa H2. Diphenyl ether and 2-phenoxy-1-phenylethanol were also used as 4-O-5 and β-O-4 model compounds of lignin, respectively. The unique activity of Ni/AlP0.5Ox could be attributed to metallic Ni that interacts with AlP0.5Ox and the unique adsorption of substrates on the carrier. Lignin can also be degraded over Ni/AlP0.5Ox via selective cleavage of the C–O bond, and 26.60 wt % yield of identified monomers was obtained.
研究领域:
催化化学
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生物质能
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Jian Wei,Yucui Hou,Tianqi Huang,Aohua Zheng,Shuhang Ren,Weize Wu
Identifying the source of products in lignin hydro-liquefaction oil is crucial for assessing the lignin conversion efficiency. The utilization of hydrogen donor solvents (HDSs) complicates the determination of whether polycyclic aromatic hydrocarbons (PAHs) derive from lignin or HDS. Thus, identifying the source of PAHs in the oil can improve our understanding of lignin structures and enhance its utilization. To address this challenge, 1,2,3,4-tetrahydroquinoline (THQ) was used as an HDS to trace products within the oil. The results showed that (1) lignin could be completely liquefied in THQ under optimal conditions: a THQ/lignin mass ratio of 0.5, a reaction temperature of 450 °C, an initial H2 pressure of 8 MPa, a reaction time of 4 h, and a molybdenum sulfide/lignin mass ratio of 1; (2) PAHs with 2–6 rings were identified in the oil and confirmed to derive solely from lignin through qualitative and quantitative analyses via GC–MS rather than THQ.
研究领域:
能源化学
·
环境科学
·
生物质转化
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 2
·347
·
IF 4.2
Fangli Du,Xuequan Xian,Peiduo Tang,Yanming Li
A sulfonyl-chloride-modified lignin-based porous carbon-supported metal phthalocyanine catalyst was prepared and used to replace the traditional Fenton’s reagent for lignin degradation. The catalyst underwent a detailed characterization analysis in terms of functional group distributions, surface area, morphological structure, via FT-IR, XPS, BET, and SEM. The catalyst possessed a specific surface area of 638.98 m2/g and a pore volume of 0.291 cm3/g. The prepared catalyst was studied for its ability of oxidative degradation of lignin under different reaction conditions. By optimizing the reaction conditions, a maximum liquid product yield of 38.94% was obtained at 135 °C with 3.5 wt% of catalyst and 15 × 10−2mol/L H2O2; at the same time, a maximum phenols selectivity of 32.58% was achieved. The compositions and properties of liquid products obtained from lignin degradation using different catalyst concentrations were studied comparatively via GC-MS, FT-IR,1H-NMR, and EA. Furthermore, the structure changes of solid residues are also discussed.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）