BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Leping Zhang,Weiwei Zhang,Fenglun Zhang,Jianxin Jiang
Camellia oleifera shell (COS), a by-product of processing woody vegetable oil, is rich in hemicellulose and lignin. In this study, we investigated the effects of acid concentration, pretreatment temperature and reaction time on the concentration and yield of xylo -oligosaccharides (XOS) and the degree of polymerization (DP) distribution of XOS when pretreating COS with malic acid (MA). Under moderate condition (2 M MA, 120 ℃, 30 min), the maximum yield of XOS with DP 2–4 was 48.78% (based on the initial xylan) with low xylose, 5-hydroxymethylfurfural (HMF) and furfural, in which xylobiose (X 2 ), xylotriose (X 3 ) and xylotraose (X 4 ) concentrations were 5.22 g/L, 2.75 g/L and 2.91 g/L, respectively. In addition, acid-insoluble lignin (AIL) in the residue after MA pretreatment and milling wood lignin (MWL) were mainly composed of guaiacyl and syringyl. AIL has higher thermal stability than MWL, which can be the stabilizer for producing flame-resistant materials.
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高影响因子
POLYMER TESTING
·
2020
·
IF 3.275
Boyu Du,Changzhou Chen,Yang Sun,Mengtian Yu,Bingyang Liu,Xing Wang,Jinghui Zhou
We reported a new approach for development of lignin bio-oil-based electrospun nanofibers (LENFs) that had high substitution ratio (up to 80 wt%) and good morphology. This approach was particularly unique and translatable as it used small molecule lignin bio-oil with high reactivity and low heterogeneity obtained via lignin depolymerization reaction to produce well-oriented LENFs. Firstly, effects of various blends solutions ratios and electrospinning parameters on the characteristics of the obtained LENFs were analyzed. The results showed that the optimal parameters that resulted in the best electrospun nanofibers were as follows: blend solution ratio, the 20 wt% blend solution containing 80 wt% straw lignin bio-oil (SLB) and 20 wt% polyacrylonitrile (PAN), flow rate , 1 mL/h, voltage, 20 kV, rotational speed, 500 r/min and the distance between needle and collection screen, 20 cm. Secondly, used the best LENFs, we also applied to prepare lignin bio-oil-based carbon nanofibers (LCNFs) and estimated its properties by scanning electron microscope (SEM), X-ray diffraction (XRD) patterns, Raman spectroscopy and tension testing. Our results demonstrated that compared with pure PAN carbon nanofibers (PCNFs), the as-prepared LCNFs had similar smooth surfaces, similar crystallinity and similar mechanical properties. This work can promote the utilization of lignin depolymerization main-products to produce lignin-based materials, while also help to reduce use of high-cost PAN.
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高影响因子
Applications in Energy and Combustion Science
·
2021
·
IF 0
Huiyan Zhang,Bingbing Luo,Kai Wu,Han Wu,Jiajun Yu,Siyu Wang
Catalytic fast pyrolysis of lignin is easy to cause agglomeration and coking, resulting in low-yield aromatic hydrocarbons. Catalytic pyrolysis of modified lignin combined with metal-modified HZSM-5 was proposed to enhance the aromatic yield. The experiment results showed that chemical modification with Ca(OH) 2 not only inhibited the agglomeration behavior of lignin but also increased the yield of light phenolic compounds. Moreover, Ca 2+ -loaded lignin combined with metal-modified HZSM-5 was conducive to the formation of aromatics. The total yield of aromatics from the catalytic fast pyrolysis of Ca 2+ -loaded lignin over Zn/HZSM-5 was improved from 31.1 to 46.1 mg/g. The mechanism insight showed that Ca 2+ modification realized the chemical combination between Ca 2+ and the functional groups which are responsible for the agglomeration of lignin, and then the introduction of the Zn species suppressed the hydrogen transfer reaction and enhanced the dehydrogenation pathway, resulting in the increase of aromatic yield.
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Bioresource Technology Reports
·
2020
·
IF 0
Chunyan Yang,Houfang Lu,Yanchun Shi,Yingming Zhu,Kejing Wu,Yingying Liu,Changjun Liu,Bin Liang
In this study, Kraft lignin was efficiently converted into aromatic monomers of arenes, aromatic alcohols, and aromatic aldehydes over nano molybdenum carbides catalysts supported on porous ZSM-22, ZSM-5, USY, Beta, and IM-5 zeolites in ethanol. The results showed that ZSM-22 exhibited the highest performance with maximum aromatic yield of 0.609 g/g Kraft lignin at 280 °C for 3 h with 20% Mo loading, and the catalytic performance over ZSM-22 retained for 4 recycling runs without obvious aromatic yield loss. The high activity over ZSM-22 zeolite is attributed to the high dispersion of β-Mo 2 C particles with more exposed active sites and enhanced accessibility of lignin to β-Mo 2 C in large pores. Aggregation of β-Mo 2 C for higher Mo loading is unfavorable for Kraft lignin decomposition. The performances over differently pretreated ZSM-22 zeolites demonstrate that large pore size and external surface areas are key factors in determining the catalytic activity .
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Science China-Materials
·
2024
·Vol. 67
·期 3
·954-964
·
IF 6.8
Chen Jiayue,Cao Meilian,Yue Yiying
The high-value utilization of lignin meets the demand for the reclamation of wastes and is of great significance for achieving carbon neutrality. However, lignin is unstable and prone to melting and deformation at high temperatures, requiring a long period of stabilization. The carbon nanofiber (CNF) membrane prepared by electrospinning has advantages such as high aspect ratio, low density, good light absorption, and a large number of pores favorable for steam transportation. Based on co-electrospinning, a lignin-based CNF membrane material was prepared in this work. The preparation process of this material can not only save the stabilization time of lignin-based nanofibers but also improves the hydrophilicity and light absorbance of the membrane through zinc chloride activation and the addition of pore-forming agents (terephthalic acid and polymethyl methacrylate). As a photothermal layer of an interfacial solar evaporation system, the membrane has a light absorption of 94.3% over the whole sun spectrum. Furthermore, the interfacial solar evaporation system with the prepared CNF membrane as the photothermal layer has an evaporation rate of 1.43 kg m −2 h −1 under one sun, with an evaporation efficiency of 93.8%. In addition, the evaporator has good circulation and salt resistance ability. After 15 h of continuous illumination, it still maintains excellent evaporation rate. This type of CNF membrane with lignin as the main carbon source has great potential as a photothermal conversion material in future desalination applications.
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高影响因子
Science Advances
·
2020
·Vol. 6
·期 45
·
IF 13.117
Jiang Yan,Qinglei Meng,Xiaojun Shen,Bingfeng Chen,Yang Sun,Junfeng Xiang,Huizhen Liu,Buxing Han
Phenol is an important commodity chemical in the industry, which is currently produced using fossil feedstocks. Here, we report a strategy to produce phenol from lignin by directly deconstructing C sp2 –C sp3 and C–O bonds under mild conditions. It was found that zeolite catalyst could efficiently catalyze both the direct C sp2 –C sp3 bond breakage to remove propyl structure and aliphatic β carbon–oxygen (C β– O) bond hydrolysis to form OH group on the aromatic ring. The yield of phenol could reach 10.9 weight % with a selectivity of 91.8%. In this unique route, water was the only reactant besides lignin. A scale-up experiment showed that 4.1 g of pure phenol could be obtained from 50.0 g of lignin. The reaction pathway was proposed by a combination of control experiments and density functional theory studies. This work opens the way for producing phenol from lignin by direct transformation of C sp2 –C sp3 and C–O bonds in lignin.
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高影响因子
CHINESE CHEMICAL LETTERS
·
2018
·
IF 2.631
Feng Chen,Long Wu,Zeping Zhou,Jiajun Ju,Zhengping Zhao,Mingqiang Zhong,Tairong Kuang
Lignin is the most abundant and important macromolecule in organic matter and its yield is second only to cellulose. Lignin is abundant in source, low in price, and has a large number of active groups such as methoxy group and carboxyl group, so it has great utilization value. We used lignin as a carbon source to prepare porous carbon nanosphere (PCN) materials, and in-situ synthesized the MoS 2 on its surface. The high specific surface area (∼462.8 m 2 /g), large pore volume and good electron conductivity of the porous carbon scaffold facilitated the reversible electro-chemical reaction of S towards metallic Li, and thus the nano-hybrid showed a high specific energy and excellent cycle stability which still remained 520 mAh/g after 50 cycles.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhuoyu Han,Yitong Lu,Yuliang Li
Lignin has limited potential for transformation into high-value-added chemicals due to the non-polar nature and high bond dissociation energy of its intramolecular C-C bonds. Herein, we synthesized an N-doped Nb 2 O 5 photocatalyst with rod-shaped structure through hydrothermal method followed by calcination for C-C bonds cleavage of β-O-4 type lignin model compound under simulated sunlight. The comprehensive characterization results demonstrated that N doping and the resultant oxygen vacancies significantly enhance visible light response intensity of Nb 2 O 5 , while also altering the valence band and conduction band position. The enhanced reducibility at high conduction band position facilitated the rapid reduction of O 2 to generate superoxide radicals, accelerating the separation of carriers. The N-doped Nb 2 O 5 catalyst achieved 90% lignin conversion, surpassing pristine Nb 2 O 5 (59%), with stable performance over 5 consecutive cycles. This work provides a reference for developing efficient C-C bond selective cleavage photocatalysts through doping strategies.
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产品关联
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高影响因子
RSC Advances
·
2025
·Vol. 15
·期 45
·38294-38306
·
IF 4.6
Siqi Ren,Dongfang Fan,Qian Zhang,Yunhong Jiao,Jianzhong Xu,Jixing Xie
Lignin, a natural macromolecule rich in aromatic rings and hydroxyl groups, holds significant promise in environmentally friendly applications. In this study, a lignin-based flame retardant (lignin–diethylenetriamine–phytic acid, P2N-lig) was synthesized through a Mannich reaction between alkali lignin and diethylenetriamine to introduce nitrogen, followed by phosphorylation with phytic acid to incorporate phosphorus. When P2N-lig were added into PLA composites (T-PLA) which were toughened by TPU and MMT, the T-PLA/P2N-lig composites demonstrated enhanced physicochemical and flame-retardant properties. The 9 wt% T-PLA/P2N-lig formulation exhibited acceptable mechanical performance alongside significantly improved thermal stability and fire resistance, achieving a 39.27% reduction in peak heat release rate (pHRR), a 22.88% decrease in total heat release (THR), and a UL-94 V-0 rating. Further evaluation of 3D-printed specimens revealed that the 6 wt% P2N-lig formulation achieved a limiting oxygen index (LOI) >24%, a UL-94 V-2 classification, and minimal mechanical degradation, demonstrating suitability for 3D printing applications.
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DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Ziqi Zhu,Pei Yang,Wentao Huang,Xiaoyan Zhou
Modifications of urea-formaldehyde (UF) resin to achieve better bonding performance and lower formaldehyde emission are still an alluring task in the wooden composite industry. Herein, by strategically constructing a photocatalytic oxidation system relying on carbon dot-catalyzed peroxymonosulfate (PMS) activation, we confirmed that Kraft lignin can be readily oxidized to potent modifiers for improving the bonding performance of low-molar-ratio UF resin (F/U = 0.95). We found that the oxidation system consisting of carbon dots and PMS in a mass ratio of 1:20 revealed optimal efficiency in the oxidative valorization of lignin by primary cleavage of β–O–4 linkages, resulting in a remarkable reduction of molecular weight from 2026 to 679 Da. Meanwhile, lignin side-chain oxidation triggered by radicals (mainly involving sulfate radicals) also contributed largely to the transformation of S units to G and H units via demethoxylation, and the reaction patterns conferred the oxidation products an increased amount of aliphatic OH and phenolic OH. In comparison with untreated lignin, the lignin-degraded fragments promised relatively higher hydroxymethylation efficiency and enhanced chemical compatibility in the UF resin synthesis system, fostering the formation of copolymers containing phenolic-like moieties and branched polymer structures. Profiting from this structurally homogeneous modification of oxidized lignin, the copolymer resin not only revealed comparable storage stability to the UF resin but also possessed enhanced bonding performance on the premise of rather low formaldehyde emission, and plywood panels bonded with the lignin-modified resin exhibited a higher tensile shear strength of 0.81 MPa, which was a 58.8% increase with reference to the UF resin-bonded panels, and as a result complied with the relevant national standard (≥0.7 MPa). Overall, the lignin photocatalytic oxidation strategy proposed in our study would open a new avenue for providing biobased and potent modifiers in the production of wood adhesives.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Huirong Zhang,Yi Shen,Xiaokai Shi,Jinlei Cui,Baofeng Wang,Yanxia Guo,Dongke Zhang,Fangqin Cheng
Persistent environmental pollution by heavy metals, particularly Cr (VI), poses significant risks to ecosystems and human health due to its high toxicity and bioaccumulation potential. The development of high-performance, cost-effective adsorbents from sustainable materials remains a critical challenge in the field of Cr (VI) remediation. This study investigates the influence of pyrrolic-N (N-5) within nitrogen-doped hierarchical porous carbon (N-HPC) on its adsorption capacity. Results indicate that N-HPC variants with a higher N-5 content exhibit superior adsorption abilities. The optimal sample demonstrated an exceptional adsorption capacity of 386.2 mg/g for Cr (VI). Even after seven regeneration cycles, this N-HPC variant maintained a remarkable 77.8 % removal efficiency for Cr (VI), highlighting its robust stability and selectivity. The relationship between the physicochemical properties of N-5 and N-HPC was thoroughly examined, revealing that N-5 plays a crucial role in the adsorption process. Due to its high electronegativity, nitrogen-doping into the carbon framework generates a dipole moment, enhancing the electronegativity of N-HPC, altering its local electron density and polarity, increasing specific surface area, carbon defect density, and ion exchange capacity. These factors collectively contribute to significant improvements in pore filling, ion exchange efficiency, and electrostatic adsorption by N-HPC. The reduction complexation mechanism emerges as the dominant factor in the adsorption process. N-5 not only provides reducing electrons as an electron donor, facilitating the continuous conversion of Cr (VI) to Cr (III), but also acts as an adsorption active site, complexing Cr to the surface of N-HPC. This synergistic effect strengthens the reduction complexation, enhances adsorption performance, and improves the regeneration cycle and adsorption selectivity for Cr.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Wenfeng Li,Zhengtao Wei,Siquan Wu,Xuliang Lin
In sustainable materials engineering, designing rational and ecologically compatible ultraviolet (UV) protective materials to improve the efficiency of light protection is a major challenge. Sodium lignosulfonate (SL), a renewable biomass derivative possessing inherent UV-blocking and antioxidant properties, has been utilized as a foundational component in this research. Through one-pot synthesis approach, a light-colored sodium lignosulfonate zinc oxide composite (ZnO@SL) was successfully fabricated. The effective incorporation of ZnO within the SL matrix through systematic experimental characterization, while the preservation of the hexagonal wurtzite crystalline structure was concurrently preserved. Superior broadband UV attenuation is observed in the nanocomposite compared to pristine ZnO and SL through UV–visible spectroscopy and in vitro SPF evaluation. Through the complementary mechanisms combining physical scattering and chemical absorption, the excellent photoprotection enhancement is achieved, particularly when integrated with chemical sunscreens octocrylene (Oct) and avobenzone (Avo). The SPF value increases from 8.9 to 98.41 at a 2 wt% composite loading. The preserved π-conjugated system and oxygen-rich functional groups in SL are identified to facilitates charge transfer interactions with organic UV filters. This innovative engineering strategy establishes ZnO@SL as a dual-functional additive for the development of high-performance bio-based photoprotective formulations, offering enhanced light protection while reduced environmental impact.
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PubMed
高影响因子
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