INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Tian He,Fangeng Chen,Wenxiang Zhu,Ning Yan
There is a strong interest in developing environmentally friendly synthesis approaches for making polyurethane elastomers (PUE) with desirable mechanical performance and flame retardancy suitable for a variety of applications. Hence, in this study, a novel nano functionalized lignin nanoparticle (Nano-FL) containing nitrogen (N) and phosphorus (P) moieties was developed via mild grafting reactions combined with the ultrasound method. The Nano-FL incorporated in the PUE acted as both crosslinking agents and flame retardants. The novel Nano-FL showed good compatibility and dispersibility in the PUE matrix, thereby overcoming the weakening effect of adding traditional lignin flame retardants on the mechanical properties of the PUE materials. PUE/Nano-FL exhibited strong tensile properties. Compared with control neat PUE, with 10 wt% of Nano-FL addition, the PUE attained a limiting oxygen index as high as 29.8% and it also passed the UL-94 V-0 rating. Furthermore, Cone Calorimetry Test (CCT) showed that the addition of Nano-FL not only reduced the heat release rate and the total heat release but also decreased the total smoke production rate during combustion. The char residues of PUEs with Nano-FL showed a high oxidation resistance with dense and continuous structural morphologies. The combined barrier and quenching effects of the char layer provided excellent flame retardancy performance. The novel Nano-FL developed in this study showed excellent promises as green functional additives for enhancing mechanical, thermal and flame retardancy performance of a wide range of polymers.
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BIORESOURCE TECHNOLOGY
·
2022
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IF 11.889
Hailian Gao,Jiebin Wang,Meixuan Liu,Shunxin Wang,Wenbo Li,Qingda An,Kunlan Li,Ligang Wei,Chi Han,Shangru Zhai
The aerobic oxidation of lignin model 2-phenoxyacetophenone (2-PAP) in cooperative ionic liquid mixtures (CoILs) with 1-ethyl-3-methylimidazolium acetate ([C 2 C 1 im]OAc) and 1-benzyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([B Z C 1 im]NTf 2 ) was investigated. Complete degradation of 2-PAP was achieved with [C 2 C 1 im]OAc/[B Z C 1 im]NTf 2 molar ratio ( R IL ) of 1/1 and 1/2 at 100 °C for 2 h. The conversion and product yields from CoILs were higher than those in pure ILs, indicating the cooperative effects of [C 2 C 1 im]OAc/[B Z C 1 im]NTf 2 on cleaving aryl–ether bonds. [C 2 C 1 im]OAc promoted the catalytic cleavage of aryl–ether bonds and solvation, and [B Z C 1 im]NTf 2 induced the formation of alkyl radicals and enhanced the product selectivity. Accordingly, the highest conversion of alkali lignin (79.8%) was obtained with R IL of 5/1 at 100 °C for 2 h, and phenol monomers (306 mg/g) were selectively produced. The CoILs exhibited good catalytic capacities for oxidative depolymerization of lignin, which strongly depends on the changes in intermolecular interactions and structural organization with varying R IL .
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APPLIED ENERGY
·
2022
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IF 11.446
Tan Li,Jing Su,Huiyuan Wang,Cong Wang,Wen Xie,Kaige Wang
NiMo-doped catalysts were investigated for the conversion of lignin to drop-in fuel through catalytic hydropyrolysis. The influence of NiMo-doped catalysts with different carriers and Ni/Mo molar ratios on the hydropyrolysis product distribution were studied using both lignin and lignin model compounds. Two coefficients were proposed to qualitatively evaluate the catalytic performance of NiMo-doped catalysts. Low yield of methane (13.04c%) and high yield of condensable hydrocarbons products (25.82c%) with low selectivity of polyaromatics (4.37%) were obtained at 1.0 MPa H 2 and 400 °C catalytic temperature during lignin catalytic hydropyrolysis over Ni 1 Mo/ZrO 2 . The hydrodeoxygenation activity of Ni x Mo/ZrO 2 depends on Ni 0 , Mo 4+ , and Mo 3+ . The synergistic effect of Ni and Mo promotes the removal of the phenolic methoxy group. The increase in hydrogen pressure tends to make hydrogen to be consumed through hydrocracking and hydrogenation reactions. The influence of Ni 1 Mo/ZrO 2 on evolution of lignin hydropyrolysis volatiles was revealed. Ni shows strong activity in the removal of phenolic hydroxyl groups and benzene ring hydrogenation, while Mo tends to remove phenolic methoxy groups.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Riyang Shu,Linxuan Zhou,Zhengchen Zhu,Bowen Luo,Hongyun You,Zhuojie Zhong,Yao He
Enzymatic hydrolysis lignin is a kind of byproduct from the biorefinery process, and hydrogenolysis is a promising approach to valorize the lignin waste. This work proposed an efficient hydrogenolysis of enzymatic hydrolysis lignin over in situ prepared RuNi/C bimetallic catalyst . RuNi/C catalyst exhibited a much higher catalytic activity than Ru/C catalyst with the addition of Ni species. A series of characterizations were carried out to reveal the synergistic effect of the bimetallic catalyst . The results indicated that the interaction between Ru and Ni formed an electron transfer from Ru to Ni and resulted in intensified hydrogen adsorption, which was the crucial factor for the enhanced hydrogenolysis performance. The reaction condition of lignin hydrogenolysis was optimized, and 20.4 wt% monomer product yield was achieved at the temperature of 280 °C. This catalytic system is easy to realize and promising to be employed in the field of lignin utilization.
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RENEWABLE ENERGY
·
2022
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IF 8.634
Wei Lv,Xiaohong Hu,Yuting Zhu,Ying Xu,Shijun Liu,Peili Chen,Chenguang Wang,Longlong Ma
Herein, the catalysts of ruthenium and molybdenum oxide nanoparticles supported on activated carbon (AC) were synthesized by precursor stepwise impregnation and employed for the hydrodeoxygenation (HDO) of lignin oil. The XRD, TEM, XPS and NH 3 -TPD-MS result of RuMoO x /AC catalysts confirm that the method of loading molybdenum precursor before ruthenium precursor is advantageous for the MoO x and Ru nanoparticles high dispersion and the reduction of MoO x species enhance the amount of acidity of catalyst. Meanwhile, the reduction temperature of RuMoO x /AC-1-T catalysts could effectively regulate the MoO x species that determine the activity and product distribution of HDO. The conversion of aromatic monomers/dimers were up to 96% with high selectivity of hydrocarbon over RuMoO x /AC-1-350 catalyst at 160 °C and 30 bar H 2 . Which is attributed to the MoO 3 and Ru species possess the excellent activity of benzene ring deep hydrogenation, ether bond breaking and acid dehydration. The RuMoO x /AC-1-350 catalyst effectively converted lignin oil (from the depolymerization of cornstalk hydrolysis residue) into hydrocarbons (56.9 wt%) and cyclohexanol/ethers (18.7 wt%) under 280 °C and 3 bar H 2 . The durability of the RuMoO x /AC-1-350 catalyst for HDO of lignin oil was also investigated and showed that the RuMoO x /AC-1-350 catalyst had good stability, regenerability and repeatability.
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BIOMACROMOLECULES
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2022
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IF 6.978
Ajoy Kanti Mondal,Dezhong Xu,Shuai Wu,Qiuxia Zou,Fang Huang,Yonghao Ni
Preparation of natural polymer-based highly conductive hydrogels with tunable mechanical properties for applications in flexible electronics is still challenging. Herein, we report a facile method to prepare lignin-based Fe3+-rich, high-conductivity hydrogels via the following two-step process: (1) lignin hydrogels are prepared by cross-linking sulfonated lignin with poly(ethylene glycol) diglycidyl ether (PEGDGE) and (2) Fe3+ ions are impregnated into the lignin hydrogel by simply soaking in FeCl3. Benefiting from Fe3+ ion complexation with catechol groups and other functional groups in lignin, the resultant hydrogels exhibit unique properties, such as high conductivity (as high as 6.69 S·m–1) and excellent mechanical and hydrophobic properties. As a strain sensor, the as-prepared lignin hydrogel shows high sensitivity when detecting various human motions. With the flow of moist air, the Fe3+-rich lignin hydrogel generates an output voltage of 162.8 mV. The assembled supercapacitor of the hydrogel electrolyte demonstrates a high specific capacitance of 301.8 F·g–1, with a maximum energy density of 26.73 Wh·kg–1, a power density of 2.38 kW·kg–1, and a capacitance retention of 94.1% after 10 000 consecutive charge–discharge cycles. These results support the conclusion that lignin-based Fe3+-rich, high-conductivity hydrogels have promising applications in different fields, including sensors and supercapacitors, rendering a new platform for the value-added utilization of lignin.
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BIORESOURCE TECHNOLOGY
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2023
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IF 11.4
Qi Li,Ruiying Gao,Yucheng Li,Bo Fan,Cuiluan Ma,Yu-Cai He
Lignin is a critical biopolymer for creating a large number of highly valuable biobased compounds. Vanillin, one of lignin-derived aromatics, can be used to synthesize vanillylamine that is a key fine chemical and pharmaceutical intermediate. To produce vanillylamine, a productive whole-cell-catalyzed biotransformation of vanillin was developed in deep eutectic solvent − surfactant − H 2 O media. One newly created recombinant E. coli 30CA cells expressing ω-transaminase and L -alanine dehydrogenase was employed to transform 50 mM and 60 mM vanillin into vanillylamine in the yield of 82.2% and 8.5% under 40 °C, respectively. The biotransamination efficiency was enhanced by introducing surfactant PEG-2000 (40 mM) and deep eutectic solvent ChCl:LA (5.0 wt%, pH 8.0), and the highest vanillylamine yield reached 90.0% from 60 mM vanillin. Building an effective bioprocess was utilized for transamination of lignin-derived vanillin to vanillylamine with newly created bacteria in an eco-friendly medium, which had potential application for valorization of lignin to value-added compounds.
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高影响因子
Polymers
·
2023
·Vol. 15
·期 8
·1947
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IF 5
Linfei Zhou,Xiangyu You,Lingjie Wang,Shijie Qi,Ruichen Wang,Yasumitsu Uraki,Huijie Zhang
Lignin-based carbon fibers (LCFs) with graphitized structures decorated on their surfaces were successfully prepared using the simultaneous catalyst loading and chemical stabilization of melt-spun lignin fibers, followed by quick carbonization functionalized as catalytic graphitization. This technique not only enables surficial graphitized LCF preparation at a relatively low temperature of 1200 °C but also avoids additional treatments used in conventional carbon fiber production. The LCFs were then used as electrode materials in a supercapacitor assembly. Electrochemical measurements confirmed that LCF-0.4, a sample with a relatively low specific surface area of 89.9 m2g−1, exhibited the best electrochemical properties. The supercapacitor with LCF-0.4 had a specific capacitance of 10.7 F g−1at 0.5 A g−1, a power density of 869.5 W kg−1, an energy density of 15.7 Wh kg−1, and a capacitance retention of 100% after 1500 cycles, even without activation.Keywords:lignin;carbon fiber;catalytic graphitization;supercapacitor;electrochemical performance
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INDUSTRIAL CROPS AND PRODUCTS
·
2021
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IF 5.645
Feng Shu,Yingjie Guo,Lu Huang,Mingu Zhou,Guoyun Zhang,Hang Yu,Junhua Zhang,Fangxia Yang
Developing green and sustainable reagents and materials is of great significance for the lignin-containing nanocellulose (LNC) production. In this study, new green ternary deep eutectic solvents (DESs) pretreatment followed by microfluidization were used to prepare LNC from poplar. Under optimal pretreatment conditions (choline chloride: lactic acid: p -toluenesulfonic acid molar ratio of 2:10:1, 100 °C), ultrafine ribbon-like LNCs about 23.29 nm wide and 1.16 nm thick with uniformly distributed spherical lignin particles were obtained. The yield of the LNC reached 64.65%. The LNC exhibited cellulose I crystal structure, good dispersion stability in water and high lignin content of 27.65%. The LNC also possessed high thermal stability (T max = 370 °C). Additionally, the LNC suspensions showed high viscosity and strong gel-like behavior. The novel ternary DESs pretreatment combined with microfluidization process offers a promising route in converting hardwood biomass into value-added LNC.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Lingyan Zhu,Dongbing Li,Heng Lu,Shangkun Zhang,Hao Gao
The synthesis of lignin-based graphene quantum dots (GQDs) with excellent fluorescence stability, quantum yield , and biocompatibility for sensitive and selective detection of Fe 3+ and ascorbic acid (AA) has remained a challenging endeavor. Using an acidolysis process with 17.5% nitric acid followed by hydrothermal treatment at 200 °C, this study provided an improved synthesis route for the production of high-quality GQDs from alkali lignin. The nitrogen-doped GQDs exhibit remarkable fluorescence stability under a wide range of pH (3–10), duration (1–12 h), and [NaCl] (0–1000 mM) conditions, and have a high quantum yield of 28%. The GQDs or GQDs/Fe 3+ sensing systems ([GQDs] at 50 mg L −1 , [Fe 3+ ] at 500 μmol L −1 , and UV excitation at 370 nm) for fluorescence sensing of Fe 3+ or AA have excellent sensitivity, selectivity, and reproducibility. For Fe 3+ and AA, the limit of detection is 1.49 and 1.62 μmol L −1 , respectively. Mechanism investigation shows that photoluminescence quenching is caused by the formation of GQDs-Fe 3+ complexes, whereas fluorescence recovery is due to Fe 3+ reduction by AA.
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Materials Today Chemistry
·
2021
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IF 8.301
G. Yan,S. He,N. Ding,Y. Lee,Y. Sun,X. Tang,X. Zeng,L. Lin
Recently, conductive hydrogels with multifunctionality have attracted much attention for various applications such as soft robotics and stretchable bioelectronics. Nonetheless, it remains a grand challenge to prepare conductive hydrogels with high strength and toughness at room temperatures without any external energy input. Here, the free radical polymerization of a lignin-based conductive hydrogel simultaneously featuring strong, tough, transparent, and self-healing properties is efficiently induced by a catalytic system comprised of tin metal ions and lignin molecules at room temperature without any external energy input. The tin ions and catechol groups contained in lignin can generate large amounts of hydroxyl radicals under the effect of ammonium peroxydisulfate. These free radicals can trigger the rapid self-gelation of the hydrogels at mild conditions within a few seconds (∼10 s). The dynamic cross-linking between the tin ions and catechol groups of lignin molecules in the hydrogel network endows the material with a tensile strain up to ∼1800%, which is far superior to the hydrogels triggered by other metals such Fe 3+ , Co 2+ , Ni 2+ , and so on. Moreover, the obtained hydrogels exhibit high transparency (∼93.8%), excellent conductivity, and self-healing properties. The multifunctional hydrogels triggered by a simple yet effective self-catalysis strategy could find important applications in soft machines, sensing, and the inscription of information.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Xiaobo Xu,Yeyan Chao,Xiaozhen Ma,Hua Zhang,Jing Chen,Jin Zhu,Jing Chen
The construction of an effective antibacterial micro-environment to prevent infection and biofilm formation is critically important for the design of wound dressings. Herein, a novel hydrogel wound dressing was fabricated by embedding Au nanoparticles-decorated halloysite nanotubes (Au@HNTs) into the lignin-based hydrogel matrix containing polyvinyl alcohol and chitosan. The resulting composite hydrogel, noted as LPC-Au@HNTs, exhibited an excellent photothermal antibacterial activity owing to the embedded Au@HNTs in which Au nanoparticles were generously filled into the lumen of Halloysite nanotubes. The typical sample containing 4 wt% of Au@HNTs in the composite hydrogel (LPC-Au@HNTs4) had good mechanical and photothermal properties. The surface temperature of as-prepared hydrogel increased to 57.59 °C after 5 min upon NIR light irradiation (808 nm) at 1.0 W/cm 2 . The photothermal effect endowed the hydrogel dressing with excellent antibacterial activity, with significantly enhanced inhibition rates of Escherichia coli (99.00 %) and Staphylococcus aureus (98.88 %). Experiments in a mouse full-thickness skin defect wound model also showed that the hydrogel dressing had a facilitative effect on the repair of traumatic surfaces. This study provides a broadly appliable wound dressing for treating bacteria-infected wounds, greatly contributing to the design of photothermal antibacterial biomedical materials for wound healing.
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