CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Ying Zhu,Ruohong Bian,Yang Yu,Jiongjiong Li,Cheng Li,Yan Lyu,Xiaona Li,Jing Luo,Jianzhang Li
The conversion of industrial lignin into wood adhesives offers a solution to issues related to formaldehyde pollution and the reliance on petrochemical resources of traditional formaldehyde-based resins, while promoting environmental and energy sustainability. However, conventional methods for preparing lignin-based adhesives generally involve the use of materials like formaldehyde, organic solvents, and costly epoxy, hindering their industrial application. This study introduces a novel approach for producing eco-friendly lignin-based wood adhesives using aminated lignin-Cu nanoparticles. The lignin-Cu nanoparticles were synthesized in water as a single solvent through a sedimentation method. Amination modification was achieved by grafting amino-terminated hyperbranched polyamide onto the nanoparticles via a Schiff base reaction. The prepared adhesive demonstrated a remarkable bonding strength of 1.51 MPa and debonding work of 0.272 J, which were 2.75 and 6.33 times higher than those of the pure lignin adhesive, respectively. Moreover, the adhesive exhibited improved water resistance with a wet shear strength of 1.15 MPa and sustained mildew resistance for approximately 100 days. Notably, this adhesive was synthesized without the use of formaldehyde, phenol, acids, or organic solvents, minimizing reliance on fossil resources and lowering costs compared to many formaldehyde-based and biomass adhesives. This research opens up new avenues for the efficient utilization of industrial lignin and the production of formaldehyde-free, environmentally friendly adhesives, which holds significant promise for energy conservation, emission reduction, and sustainable development within the wood-based panel industry.
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Materials Today Communications
·
2024
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IF 3.7
Lijun Cao,Pengrui Chen,Bei Qi,Zhongyu Qi,Liang Chang,Junyue Shan,Ce Sun,Haiyan Tan,Yanhua Zhang
Currently, to address the performance deficiencies associated with high brittleness, inadequate thermal stability, and susceptibility to hydrolysis in polylactic acid (PLA), it is common practice to incorporate multiple or high proportions of additives. However, this approach raises concerns regarding interface compatibility, energy consumption, and environmental impact. In this context, we introduce an environmentally friendly, bio-based PLA modifier that is facile to prepare and facilitates multi-functional applications at a minimal dosage. The presence of a benzene ring structure in lignin endows the material with ultraviolet (UV) resistance, thermal stability, and hydrophobic characteristics, while the exceptional adhesion properties of polydopamine (PDA) enhance interfacial compatibility. A novel biomass polylactic acid modifier, designated as OL@PDA, has been synthesized by modifying low-molecular-weight lignin (OL) with PDA. Comparative analysis of OL@PDA/PLA composite materials reveals a 14.08 % increase in tensile strength and a 42.00 % enhancement in elongation at break relative to pure PLA. The incorporation of the lignin-derived benzene ring structure effectively transforms PLA from a hydrophilic to a hydrophobic material. Furthermore, the UV transmittance at 400 nm (T 400 nm %) is recorded at 65.8 % for pure PLA, which significantly decreases to below 5 % for OL@PDA/PLA composites. The integration of OL@PDA as a modifier in PLA materials yields comprehensively performance enhancements while maintaining a low additive concentration.
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Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Zhijie Jiang,Xutang Liu,Wei Zhao,Fei Wang,Mingyu Cui,Linyang Dong,Chong Liang,Dingkai Wang,Shuiyuan Fu
Photocatalysis, a sustainable development strategy, employed to produce value-added chemicals from lignin, has attracted much attention due to its low energy consumption and mild reaction conditions. Carbon quantum dots (CQDs) and tungsten oxide (WO 3 ) composite photocatalysts (CQDs/WO 3 ) were prepared by ultrasonic assisted wet impregnation method in this study. The CQDs/WO 3 nanosheets exhibit good optical properties and satisfactory performance of lignin depolymerization. Characterization results embody that the addition of CQDs significantly changes the morphology of WO 3 . Compared with bulk pure WO 3 , CQDs/WO 3 becomes a nanosheet structure in the size of ∼ 200 nm. Furthermore, CQDs can absorb photogenerated electrons as well as reduce the recombination of photogenerated electrons and holes. The strong oxidizing ability of n -type semiconductor WO 3 enables it to effectively break the typical bonds like C-O or C-C near polar functional groups in lignin. Due to this ingenious design, dealkaline lignin conversion was up to 34.21% as well as the highest yields of vanillin and vanillic acid in the form of lignin were 24.74 mg/g and 8.02 mg/g in 2 h at room temperature, visible light illumination and air atmosphere, respectively. And optimized CQDs/WO 3 also had satisfactory effects on three natural lignin (grass lignin, pine lignin and birch lignin), which proved its universality. Electron spin resonance experiments and mechanism investigation demonstrated that ·O 2 - and ·OH play a weighty role in photocatalytic depolymerization of lignin. This study provides a new gambit for converting lignin to high value-added chemicals (vanillin and vanillic acid) over modified WO 3 .
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WOOD SCIENCE AND TECHNOLOGY
·
2024
·Vol. 58
·期 3
·923-939
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IF 3.1
Gu Feng,Niu Xiuxue,Zhang Daquan,Cai Zhaosheng,Wang Wangxia,Song Junlong,Jin Yongcan,Xiao Huining
Developing a moisture-stable structural material with high toughness is essential for improving the stability of packaging and building materials. Wood is a pervasive structural material with naturally good mechanical properties. However, insufficient moisture stability and toughness compromises its safety and structural requirements. Herein, we constructed a moisture-stable wood veneer with high toughness by assembling the choline chloride-ethanolamine delignified wood with alkali lignin, followed by hot-pressing to densify the material. Lignin can be assembled into the microchannel of the delignified wood as a filler and binder for reducing molecular transportation and increasing internal bonding. The enhanced tensile strength (582.0 MPa) and strain (3.6%) are accompanied by a significant increase in the toughness to 11.1 MJ/m 3 , which is 37 times higher than that of natural wood. The excellent mechanical property can be preserved to a large extent after retaining in tropic moisture conditions (38 °C, 90% RH) with retention of 66.2% and 60.8% for tensile strength and toughness, respectively. A stable water contact angle on the surface and limited water adsorption of reconstructed wood indicate a lowered water infiltration velocity, suggesting highly improved moisture stability as needed for structural materials.
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NEW JOURNAL OF CHEMISTRY
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2024
·Vol. 48
·期 47
·19797-19810
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IF 2.7
Meng Lu,Lei Zhong,Yin Wang,Xiaohui Yang,Minghao Zhou
With the emergence of new standards for fire prevention, phenolic foam has attracted increasing attention due to its satisfactory cleanliness and flame retardancy. With the increasing exhaustion of fossil energy and environmental problems, finding renewable energy sources to replace petroleum-derived phenol has become a new research hotspot. Lignin is an ideal renewable resource, which can be used to partially replace phenol in phenolic foam due to its structural similarity to petroleum phenolic compounds. In this paper, lignin sulfate was used as a raw material, an aldehyde group was introduced from an external source, and on this basis, nitrogen and phosphorus modification was carried out to prepare lignin-based flame retardants, which were used to replace phenol in the production of phenolic foam. The nitrogen and phosphorus modification was conducted to prepare the lignin-based flame retardants. It was found that when the amount of flame retardant replaced was 5–20%, the compressive strength of the modified phenolic foam was better than that of pure phenolic foam. The LOI of the modified phenolic foam also improved significantly (to about 59.6%). In addition, the heat release rate, total heat release and total smoke release of the modified phenolic foam decreased obviously. This paper provides an effective method for lignin utilization to prepare bio-based phenolic foams with improved flame retardancy and mechanical properties.
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CONSTRUCTION AND BUILDING MATERIALS
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2024
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IF 7.4
Bole Ma,Zhengtao Wei,Liheng Chen,Shiqiang Tu,Xueqing Qiu
The development of superhydrophobic coatings for wood protection using biomass materials signifies a trend in future advancements. However, ensuring the durability of biomass-based superhydrophobic coatings under harsh conditions remains a formidable challenge. Here, rod-like ZnO/lignin nanosphere (LNS) composites are obtained using co-assembly, followed by changing the addition time of LNSs to control their sizes. The composites demonstrate good performance in visible-light photocatalysis test, about 47 % of the degradation of methylene blue solution within 150 min. A robust and multifunctional superhydropphobic coating is further fabricated by as-prepared ZnO/LNS composites on wood surface, with a contact angle of 163.7 ± 0.5° and a sliding angle of 2.1 ± 0.2°. Owing to the reinforcing effect imparted by rod-like ZnO, the coating demonstrated resistance to 20 cycles of abrasion and withstood 240 cycles of tape peeling. The coating also shows robustness against other mechanical and chemical damages. Furthermore, through the synergistic effect of ZnO and LNSs, the coated wood demonstrates outstanding visible light-driven photocatalytic activity and flame retardation for practical application. This study aims to facilitate the improvement and development of inorganic/lignin composites, thereby offering a novel pathway for the fabrication of modified wood products with high-performance.
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高影响因子
FUEL
·
2024
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IF 6.7
Fa-Peng Wu,Le-Le Qiu,Yun-Peng Zhao,Zong-Pin Fu,Jing Liang,Jian Xiao,Jian Li,Fang-Jing Liu,Jing-Pei Cao
Hydrogenolysis of β-O-4 linkages in lignin to produce aromatic compounds is attractive but challenging. Currently, external hydrogen source like hydrogen gas or hydrogen-donor solvent is necessary during hydrogenolysis, leading to high cost and low selectivity of products. Herein, a NiCu/Al 2 O 3 catalyst was prepared for self-hydrogen transfer hydrogenolysis (SHTH) of C β -O bond using inherent C α H-OH structure as H-source. A β-O-4 model compound, 2-phenoxy-1-phenethanol, was completely transformed into acetophenone and phenol at 220 ℃ under 1 MPa N 2 for 2h. The SHTH reaction proceeded through a dehydrogenation reaction followed by a hydrogenolysis reaction. Hydrogen radicals released from C α H-OH group generated a “hydrogen pool” on the catalyst surface, which inserted into the formed β-O-4 ketone intermediate to cleave the C β -O bond. The catalyst presented outstanding reusability and universality during the SHTH reaction. Moreover, the methoxy groups at aryl positions impeded the SHTH process, and the steric effect was related to the amount and position of methoxy groups. This study realizes the utilization of structural hydrogen from lignin model compounds for its C β -O bond cleavage , providing an economical and sustainable method toward lignin valorization.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Yuan Zhu,Tian-Xiao Yang,Hang Li,Qing-Sheng Zhao,Bing Zhao
Herein, we investigated the synergistic effects of jet milling (JM) and deep eutectic solvent (DES) pretreatment on the fractionation of grapevine lignin and the consequent enhancement of enzymatic hydrolysis . Grapevine, a substantial byproduct of the wine industry, was subjected to JM pretreatment to produce finely powdered particles (median diameter D 50 = 98.90), which were then further treated with acidic ChCl-LA and alkaline K 2 CO 3 -EG DESs. The results revealed that the combined JM + ChCl-LA pretreatment significantly increased the cellulose preservation under optimal conditions (110 °C, 4 h, and 20 % water content), achieving removal rates of 74.18 % xylan and 66.05 % lignin, respectively. The pretreatment temperature and inhibitor production were reduced, resulting in a remarkable threefold increase in glucose yield compared to untreated samples. Moreover, the structural analysis of the pretreated lignin indicated an enrichment of phenolic units, leading to enhanced antioxidant and antibacterial activities, particularly in the JM pretreated samples. These findings underscore the promising potential of the synergistic JM and DES pretreatment in facilitating the efficient utilization of grapevine lignocellulosic biomass for sustainable biorefinery technologies.
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PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2024
·
IF 5.6
Meichen Zhang,Syed Zaheer Ud Din,Jianzhen Mao,Zongwei Guo,Feng Xu
This study presents a readily synthesized deep eutectic solvent composed of guanidinium hydrochloride and lactic acid (GH/LA) for refining various industrial xylose residues (delignification and non-delignification), addressing industrial challenges caused by the accumulation of residues. Under mild conditions (120 °C for 2 h), lignin was efficiently extracted, leaving cellulose intact in the solid fraction. The isolated cellulose exhibited a theoretical sugar yield of 100 % within 48 h, which was attributed to the optimal lignin content (6.15 %) remaining in the cellulose residue. The recovered lignin demonstrated high purity (93.36–97.95 %), low molecular weight (2786–3089 g/mol), moderate polydispersity (2.29–2.37), remarkable thermal stability, and potent antioxidant activity (IC 50 =1.25 mg/mL). Comprehensive analysis confirms GH/LA DES pretreatment as a simple and effective method for efficient industrial waste utilization.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xialin Ji,Mengqing Zhou,Yongzhi Xiong,Changzhou Chen,Jianchun Jiang
Utilization of biomass derived raw material to create advanced and high value carbon biochar have attracted tremendous attention, the exploration and functionalization of novel biomass derived raw material have presented serious challenges to contemporary chemical industry. Therefore, a new renewable biomass-derived hollow carbon sphere derived from eco-friendly and environmental-friendly puffball loaded different active sites was designed to generate Co 8 M 2 /BC catalysts. The novel biomass puffball derived catalysts exhibited an excellent catalytic efficiency in hydrodeoxygenation of biomass derived phenols to obtain value-added chemicals and fuels. In this work, Vanillin (VAN) was used as a model substrate to estimate the catalytic efficiency of as-prepared Co 8 M 2 /BC catalysts. The results showed that the Co 8 Mo 2 /BC catalyst exhibited excellent catalytic activity for the VAN hydrodeoxygenation reaction to achieve achieved 99.24% conversion of VAN and 92.79% yield of 2-methoxy-4-methylphenol (MMP) under the optimal reaction conditions (240°C, 4 h, 1 MPa H 2 and 15 mL isopropanol). The uniquely shaped hollow sphere carbon, large specific surface area and synergistic catalytic effect of the Co-Mo alloy was the key reasons for the perfect hydrodeoxygenation ability. H 2 temperature program reduction (H 2 -TPR) illustrated the strong interaction between biochar and active sites and the NH 3 temperature programmed desorption (NH 3 -TPD) demonstrated a suitable amount of acid sites was responsible for high catalytic hydrodeoxygenation performance. In addition, the possible reaction mechanization of VAN hydrodeoxygenation was also proposed in the end of the study. This work provided new sights in preparation of advanced biomass derived biochar catalysts for catalytic hydrodeoxygenation of biomass derived phenols to produce high value chemicals and fuels.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Shibo Han,Guangying Huang,Han Han,Xilai Yan,Jie Xie,Hongshen He,Ajoy Kanti Mondal,Weijie Lin,Fang Huang
Currently, most polyols used in polyurethane foam (PUF) synthesis are derived from petrochemicals. However, lignin as the most abundant aromatic biopolymer rich in hydroxyl groups, is a suitable filler for synthesizing polyurethane foam. Therefore, in this study, Kraft lignin (KL) was utilized as a partial substitute for flexible polyethylene glycol 400 (PEG400). After adding 15 % KL, NaCl was introduced as a medium for synthesizing LFPUF and Polydimethylsiloxane (PDMS) was used as a foam stabilizer. Lignin-based flexible polyurethane foam (LFPUF) with high elasticity was synthesized. The aromatic ring structure of KL acted as a reinforcement for the foam, while the flexible PEG400 provided excellent flexibility to LFPUF. Na + interacts with oxygen atoms in the long chain of PEG to form a cyclic crown ether structure. This promotes proximity and ordering of the hydroxyl groups, thereby facilitating proton transfer and optimising the cell size of the foam. Ultimately, the foam synthesized with 3 % NaCl (LFPUF-3%NaCl) exhibited an average cell size and hole size of 484.1 and 183.6 μm, respectively, significantly smaller than those of the foam synthesized without NaCl (843.5 and 249.3 μm, respectively). The foam resilience and elastic recovery of LFPUF-3%NaCl were 39.56 and 99.03 %, respectively, which was higher than that of the foam synthesized without NaCl (20.36 % and 97.08 %, respectively). In addition, LFPUF-3%NaCl maintained a high elastic recovery of 97.61 % after 20 cycles of compression. The egg drop test demonstrated that the foam effectively provided protective cushioning for fragile items.
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Polymers
·
2025
·Vol. 17
·期 4
·474
·
IF 4.9
Zhipeng Yu,Yang Min,Qi Ouyang,Yuting Fu,Ying Mao,Shuanglin Xiang,Xiang Hu,Liuyun Jiang
It is a great challenge to obtain an ideal hydrogel for the clinical treatment of intrauterine adhesion (IUA) disease. Here, a novel injectable chitosan–lignin/poloxamer hydrogel loaded with platelet-rich plasma (CL-PF127@PRP) was prepared by self-assembly at room temperature. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), rheological analysis, and injectable writing were used to characterize the structure of the hydrogel. The results confirmed that the amino group of chitosan and the sulfonic group of sodium lignosulfonate were ionic-crosslinked by electrostatic attraction, which stabilized the three-dimensional structure of the PF127 hydrogel loaded with PRP, and PRP made the porous structure gradually become tight. Moreover, the CL-PF127@PRP hydrogel displayed good injectability and a solid state. The soaking experiment showed that the CL-PF127@PRP hydrogel had suitable degradation at pH = 7 and a good PRP release rate (PRP release 70% at 96 h). Cell experiments in vitro demonstrated that the CL-PF127@PRP hydrogel possessed good biocompatibility, an anti-inflammatory function, and pro-angiogenic activity. Furthermore, an animal experiment of skin wound and IUA confirmed that the skin wound closure rate of the CL-PF127@PRP hydrogel was over 50% on the seventh day. PRP improved the thickness of the endometrium and uterus receptivity, suggesting that the CL-PF127@PRP hydrogel offers great promise for the clinical treatment of IUA.
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