MACROMOLECULAR MATERIALS AND ENGINEERING
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2019
·Vol. 304
·期 10
·1900257
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IF 3.038
Chang Fang,Weifeng Liu,Xueqing Qiu
Lignin-containing polyurea coating with good ultraviolet (UV) resistance is prepared by partially substituting polyetheramine with enzymatic hydrolysis lignin. Lignin is first grafted by polyetheramine chains via Mannich reaction, which improves its interfacial compatibility with polyurea matrix. The influences of the modified lignin on the chemical and corrosion resistance, UV-aging property, and thermal stability of the polyurea coatings are studied. It is demonstrated that lignin-containing polyurea coatings exhibit excellent UV-aging properties. Aminating lignin with polyetheramine improves its dispersion in the polymer matrix. This work offers a novel method for the high-value utilization of biomass lignin in anti-UV polyurea coatings.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Liyunlong Wang,Zongwei Guo,Daliang Guo,Jiao Li,Srinivas Janaswamy,Guihua Yang,Xingxiang Ji,Gaojin Lyu
Using renewable materials as primary components for constructing superhydrophobic coatings is an effective strategy for enhancing the environmental sustainability of anti-icing technologies. Alkali lignin, a by-product of the pulp and paper industry, was graft-modified with 1H, 1H, 2H, 2H-perfluorooctyltrichlorosilane to create a robust and multifunctional superhydrophobic coating for effective anti-icing. The results demonstrated that the industrial lignin-based coating achieved a contact angle of 162.1°. Its robustness was evidenced by the fact that the contact angle showed no significant change after 400 vertical drop hammer impacts (with 100 g weights) and 900 cm of abrasion with 800-grit sandpaper. Furthermore, the coating versatility was confirmed through excellent self-cleaning properties, ultraviolet (UV) aging resistance, high-temperature durability, and substrate applicability. These characteristics provided a solid foundation for use of anti-icing coatings in extreme environmental conditions. More importantly, the superhydrophobic aluminum alloy samples exhibited outstanding anti-icing properties, as confirmed by low-temperature freezing delay and durability tests. The freezing time of the water droplets on the aluminum alloy sample was extended threefold, and the coating remained superhydrophobic for 10 days at −24 °C. This study offers new insights into the development of environmentally friendly anti-icing coatings and the value-added utilization of industrial lignin.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
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2016
·
IF 2.75
Genkuo Nie,Xiangwen Zhang,Peijuan Han,Junjian Xie,Lun Pan,Li Wang,Ji-Jun Zou
Biofuels are important alternative for fossil-based fuel but they have either relatively low density or high freezing point and viscosity. Here we reported a simple and efficient route to synthesis biofuel with density comparable to widely used JP-10 fuel as well as good low-temperature properties. Substituted diphenyl methane was synthesized by acid catalytic alkylation of lignin-derived phenols (phenol, anisole, guaiacol) with benzyl ether or benzyl alcohols, and MMT-K10 exhibits better activity than HPW, Amberlyst-15, and Al-MCM-41, due to the modest acid strength and open lamellar structure. High selectivity along with good-to-excellent conversion was obtained under optimized conditions regardless of different reactant used. Then the alkylated product was subjected to hydrogenation with the presence of Pd/C and HZSM-5, and interestingly, intramolecular cyclization reaction occurred to produce a large amount of perhydrofluorene as well as dicyclohexylmethane. Subsequently, biofuel with density as high as 0.93 g/mL and freezing point as low as −40.0 °C was obtained, which surpasses the state-of-art of biofuel reported.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2016
·
IF 3.138
Hong Niu,Dan Song,Haibo Mu,Wuxia Zhang,Feifei Sun,Jinyou Duan
Mushroom Inonotus obliquus ( I. obliquus ), a folk medicine, has been widely used to treat several human malicious tumors since 16th century. In this study, three homogenous biomolecules (designated IOA1, IOA2 and IOA3) were prepared from the alkali extract of I. obliquus . Their molecular weights were measured to be 6.1 × 10 4 , 2.9 × 10 4 and 3.5 × 10 4 g/mol respectively and all of them were characterized as lignin–carbohydrate complexes mainly comprised lignin as well as −25% carbohydrates. Antioxidant assays indicated that all of them exhibited pronounced reductive power and strong scavenging activities on DPPH and hydroxyl radicals in vitro . Immunological tests showed that they could also significantly stimulate nitric oxide production and phagocytic activity in RAW 264.7 macrophages. These results implied that the lignin–carbohydrate complexes extracted from I. obliquus might be used as novel natural antioxidants or immunostimulants in functional foods or pharmaceutical candidates.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 17
·13797-13802
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IF 3.289
Xiao-Qin Hu,De-Zhan Ye,Jin-Bo Tang,Lin-Jie Zhang,Xi Zhang
Blend films of poly(vinyl alcohol) (PVA) and a graft copolymer (GL) of acrylic acid (AA) with eucalypt lignosulfonate calcium (HLS) were prepared by using a solution casting method. The structure of GL/PVA blend films was confirmed by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM), which indicate that GL/PVA is a homogeneous system due to the strong interactions between PVA and GL. Differential scanning calorimetry (DSC) results indicate that only one glass transition temperature (Tg) can be seen over the entire blending ratio. Meanwhile, the Tg was enhanced and the melting point (Tm) was depressed when GL was added to PVA. With the addition of 3 wt% GL, the onset decomposition temperature (To) was increased by 102 °C compared to that of PVA. Compared with pure PVA, the GL/PVA exhibited a remarkable improvement in mechanical properties: the tensile strength and Young’s modulus of GL/PVA with 5 wt% GL were 39% and 285% higher than that of pure PVA, respectively. These results show that a new melt-processing method of PVA may be developed by the addition of GL in PVA.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 134
·期 10
·
IF 1.866
Yanming Li,Bingzheng Li,Fangli Du,Yong Wang,Lixia Pan,Dong Chen
This study aimed to produce phenolic formaldehyde (PF) adhesives using the liquefaction product of bagasse lignin (LPBL) as a partial substitute for petroleum-based phenol. Lignin was extracted from bagasse using 93% acetic acid solution and was rapidly degraded in hot-compressed water by microwave heating using oxalic acid as catalyst. The liquefaction yield reached 78.69% under the optimal reaction condition. Gas chromatography–mass spectrometry (GC/MS) analysis showed that the main chemical compounds of the liquefaction product included mono-substituted and bis-substituted phenols, such as 2,6-dimethoxyphenol, 4-hydroxybenzaldehyde, and so on. The LPBL was employed to replace a portion of phenol at varying ratios from 0 to 20 wt % in the preparation of PF adhesives. The molecular weight, viscosity, and adhesive strength of LPBL-PF adhesives were found to be lower than those of pure PF adhesives. With the phenol replaced by LPBL up to 20%, the viscosity and adhesive strength of the resin were 4.046 Pa s and 1.017 MPa, respectively. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44510.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 3
·1736-1742
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IF 1.395
Jun Liu,Hai-Feng Liu,Li Deng,Bing Liao,Qing-Xiang Guo
In this article, we report the enhanced anti-aging and mechanical properties of waterborne polyurethanes (WPUs) modified by lignin amines, which were prepared from lignins, formaldehyde, and diethylenetriamine via a Mannich reaction. When we introduced amino groups into the lignin, its solubility in water and reactivity with isocyanate was obviously improved. Consequently, the interaction between WPU and the lignin additive were promoted; this provided a higher mechanical performance, that is, a higher tensile strength and elongation at break. More importantly, the intrinsic antioxidative activity of lignin also benefitted the modified WPU in terms of aging resistance. According to artificial accelerated aging tests, mechanical measurement, attenuated total reflectance–Fourier transform infrared spectroscopy, and scanning electron microscopy analysis, the lignin amine modified WPU did not show any evidence of degradation after 2 months of artificial accelerated aging, whereas the pure WPU was obviously degraded. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1736–1742, 2013
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Green Processing and Synthesis
·
2017
·Vol. 6
·期 4
·363-370
·
IF 0.782
Zhihao Li,Zhihao Bi,Lifeng Yan
As the major composite of biomass, lignin can be utilized as feedstock for valuable chemicals, especially phenols. Catalysis hydrogenation of lignin is an attractive route for the conversion. However, most of them require hydrogen gas under high pressure which is dangerous. Hydrogen transfer reaction provides an alternative route to degrade and hydrogenate lignin or its units to small molecular compounds. Here, a two-step method has been employed using Raney Ni and Pd/C catalysts consecutively for hydrogen transfer catalysis for lignin. The results reveal that lignin can be degraded efficiently about 90% during conversion, and the major products are phenols with ~30% in yield. It provides a new green method for converting natural lignin to valuable chemicals.
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JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Zhang Wen,Xu Yucheng,Lin Jian
MnO 2 has been proven to be highly reactive to HCHO, but the form of powder limits its application. The problems of easy agglomeration and difficult recovery of MnO 2 powder can be solved by loading it onto fibrous materials, and improved its catalytic efficiency. However, the loading amount and stability are the challenges encountered in application. In this study, MnO 2 nanosheets were in-situ grown on lignin fiber (LFs) pads by a simple impregnation method, and the morphology and chemical structure of the synthesized MnO 2 -LFs composites were characterized. The results show that the fibers prepared by centrifugal spinning have a smaller diameter than traditional fibers, allowing for more MnO 2 loading. Due to the presence of abundant functional groups on the LFs surface, strong Mn–O and hydrogen bond interactions promote robust MnO 2 anchoring, achieving uniform distribution of MnO 2 on the LFs surface. Subsequently, δ-MnO 2 formed on the LFs surface after 72 h of impregnation in KMnO 4 solution exhibited the best HCHO degradation performance. After 2 h of reaction, the HCHO removal rate was as high as 80.14%, and it had good stability and reusability. Therefore, LFs are expected to be used as carrier materials for MnO 2 in the purification of indoor air HCHO.
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ENERGY & FUELS
·
2025
·
IF 5.3
Xiaoyu Lin,Gaojie Shi,Wenbin Ding,Bochao Yan,Suping Zhang
The rational modification and assembly of catalysts with regulable active sites for selective conversion of lignin to phenolic monomers remain challenging. In this work, a new modified spinel catalyst (NixCo3–xO4–Mo2C) is proposed for the selective production of phenolic monomers from Kraft lignin. The performance of the catalysts is greatly improved by the synergistic effect on Mo2C and NixCo3–xO4 spinel. The NiCo2O4–Mo2C catalyst achieved an outstanding catalytic conversion (up to 86.2 wt %) for the Kraft lignin depolymerization and excellent selective cleavage for phenolic monomers to 34.9 wt %. The characterization of the catalyst shows that Mo2C provided more acidic sites and improved the hydrogenation performance by changing the arrangement of spinel. Additionally, the hydrogenolysis of lignin model compounds further confirmed the outstanding performance of the modified spinel catalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shiyang Chen,Yao Zheng,Jianyu Gong,Shuhua Mo,Yuechen Ren,Junran Xu,Minsheng Lu
Widespread occurrence of sulfides in domestic and industrial wastewater contributes to environmental pollution and poses risks to human health. Therefore, the development of highly selective, sensitive, and rapid sulfur ion (S 2− ) detection probes in aquatic ecosystems is of paramount importance. In this study, lignin-stabilized silver nanoprisms (EHL@AgNPRs) were prepared using the seed growth and self-assembly methods. Based on this, a novel, high-performance, and environmentally friendly S 2− colorimetric detection method was proposed. Lignin is believed to coat the surface of AgNPRs through cation-π and electrostatic interactions, acting as an excellent dispersant and stabilizer to prevent aggregation and shape deformation. This allows AgNPRs to maintain localized surface plasmon resonance (LSPR) characteristics and superior colorimetric sensing sensitivity towards S 2− even after 30 d. The EHL@AgNPRs exhibited remarkable selectivity towards S 2− with a minimum detection limit of 41.3 nM. The conjugation of lignin with AgNPRs offers a highly promising approach for the rapid detection of S 2− in natural aquatic environments and for the valorization of lignin.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xiaoyan Zhang,Chunmei Gan,Kaiwei Huang,Fuying Li,Malin Cui,Kewei Liu,Xiaowan Yu,Da-Peng Yang
Bacterial infection has become the second leading cause of death in the world. Exploring a new highly antibacterial catalyst to replace traditional antibacterial agent is crucial for the society development of human beings. In this study, CuFe 2 O 4 /Lg-based carbon composited catalysts were rationally constructed by facile hydrothermal method. Lignin-derived carbon with enormous oxygen-containing functional group was beneficial to anchor CuFe 2 O 4 nanoparticles. The close contact interface between CuFe 2 O 4 and Lignin-based carbon material was expected to extend the range of optical absorption and promote the separation and transportation of photogenerated carriers. Under NIR (980 nm, 1.5 W/cm 2 ) light irradiation, the as-prepared CuFe 2 O 4 /Lg (20 μg/mL) exhibited excellent photo/photothermal synergetic in vitro (against Escherichia coli and Staphylococcus aureus ) and in vivo (against Staphylococcus aureus -infected mouse wound model) antibacterial performance. Furthermore, the cell count assay kit 8 (CCK-8 kit) demonstrated the good biocompatibility of this material. On the basis of the experimental results, a possible antibacterial mechanism based on the synergetic photothermal and photodynamic therapies was proposed. This work presented a lignin- derived carbon-based highly efficient antibacterial disinfection agent with desirable biosafety.
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