Journal of Energy Chemistry
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2016
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IF 2.322
Qi Wang,Neeraj Gupta,Guodong Wen,Sharifah Bee Abd Hamid,Dang Sheng Su
Vanillyl alcohol, which is made up of an aromatic ring , an alcoholic hydroxyl group, a phenolic hydroxyl group and a methoxy group, was selected as the model molecule of lignin. Various carbon materials supported Pd catalysts were chosen to catalyze the HDO of vanillyl alcohol. The catalysts were characterized via TEM, TPD, XRD, XPS and CO-chemisorption. It was found that different carbon materials could obviously influence the particle sizes, dispersion and distribution of Pd or PdO particles. Palladium and carbon can synergistically catalyze the room-temperature HDO of vanillyl alcohol even at room temperature, and the carboxyl group was found to be the effective active acid site during the reaction. Possible reaction mechanism was also proposed. The existence of the effective active acid sites on the carbon supports could obviously lower the reaction temperature without decreasing the selectivity, as a result, making the production of renewable fuels by HDO much more economically feasible, which is of much importance.
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RSC Advances
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2016
·Vol. 6
·期 111
·110229-110234
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IF 3.289
Yangyang Ma,Zhongtian Du,Fei Xia,Jiping Ma,Jin Gao,Jie Xu
Lignin is the primary source of aromatic chemicals in nature. Selective aerobic oxidation has provided a promising approach for breaking lignin into smaller aromatics. During VO(acac)2-catalyzed oxidation of lignin model compound 2-phenoxy-1-phenylethanol, benzaldehyde was unexpectedly observed as a product, in contrast to the results reported previously. The reaction pathway was studied, and a hemiacetal-like intermediate was found to be involved, and the similar intermediate was also observed during oxidation of model compound benzyl phenyl ether. Compared with direct C–O bond cleavage, prior formation of hemiacetal-like structures via oxidation would be expected to facilitate the cleavage of the aryl ether bond in aralkyl aryl ethers under mild reaction conditions.
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INDUSTRIAL CROPS AND PRODUCTS
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2024
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IF 5.6
Fengxiang Cao,Changjiang Sun,Yecheng Xu,Jianzhang Li,Zhen Fang,Zhuhui Qiao
Soybean protein isolate (SPI), a promising biomass resource to substitute petroleum-based chemicals, has been widely employed to prepare biobased board adhesives due to abundant availability, environmental compatibility, and rich functionality. However, pure SPI-based adhesives exhibit poor mechanical properties and high water absorption, which limit their practical application. In this work, dopamine-functionalized hexagonal boron nitride (PDA-BN) and carboxymethylated lignin (CAL) were introduced to serve as fillers and reinforcers to cross-link with SPI. The wet and dry shear strength of resultant adhesive increased by 172% and 64.3% to 1.58 MPa and 2.07 MPa, respectively, compared to the pure SPI-based adhesive, surpassing the performance of a vast of different SPI-based adhesives. The SPI-based adhesive also demonstrated enhanced water resistance, flame retardancy, and mildew resistance. These improvements can be attributed to the dense covalent and noncovalent intermolecular interactions and improved compatibility between PDA-BN and the SPI matrix.
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DESALINATION
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2024
·
IF 8.3
Jinsong He,Wenjie Liu,Fan Ni,Dong Tian,Yongjia Lei,Jianmei Zou,Yanzong Zhang,Fei Shen,Xiaochan An
Sacrificed template strategy has become a promising pathway to construct high performance loose nanofiltration (LNF) membranes for dye-containing wastewater treatment. However, few studies have been conducted on the recycling of templates in the LNF membrane preparation. In this study, lignin nanoparticles (LNPs) with abundant biomass sources, low cost, renewable ability, were attempted to be used as a recycled sacrificed template for the first time. The LNPs were easily renewed by concentration and NaOH dialysis with smaller nano-size and more hydrophilic surface. The optimized P-LNF-50 membrane prepared by pristine LNPs templates exhibited high water permeability of 146.24 LMH·bar −1 , excellent separation of dye/salt (i.e. rejection: 97.79 % for CR, 0.48 % for Na 2 SO 4 , 0.25 % for NaCl), and superior long-term stability. Interestingly, the R1-LNF-70 membrane prepared by 1 st recycled LNPs templates can still maintain high water permeability of 132.97 LMH·bar −1 and excellent separation of dye/salt (i.e. rejection rate: 98.31 % for CR, and 1.27 % for Na 2 SO 4 ). While the 2 nd recycled LNPs can not produce satisfied LNF membranes due to its poor figuration and easy aggregation. The inherent relationships between LNPs templates and selective layers were deeply explored. Importantly, the Sankey chart of recycling LNPs template technique and cost analysis indicated that the LNPs could be used as green templates for two cycles with comparable permeability and selectivity of dye/salts. Overall, our study paves the way for recycling of sacrificed templates for the scalable fabrication of high performance LNF membranes.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2024
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IF 3.7
Sien Yan,Linhuo Gan,Kui Wang,Kang Sun
5-Hydroxymethylfurfural (5-HMF) is one of the important bio-based platform compounds, and the catalytic conversion of glucose to 5-HMF is a highly desirable approach that is receiving increasing attention. Herein, we reported the synthesis of lignin-derived carbon supported tin oxides (SnO x /LC) catalyst via a two-step hydrothermal-pyrolytic method using wheat straw alkali lignin as a cost-effective carbon source with high carbon content. The key preparation conditions of catalyst and its catalytic conditions for the conversion of glucose to 5-HMF were investigated, respectively. Results show that under the preparation conditions of tin tetrachloride dosage of 3.0 mmol and pyrolysis temperature of 500°C, the optimized catalyst (3.0-SnO x /LC-500) with a high yield of 63.4% exhibits good catalytic performance of 5-HMF yield of 50.1% and reaction selectivity of 86.0% under the optimum conditions of reaction temperature and time of 190°C and 3 h, initial glucose concentration of 10 wt%, 3.0-SnO x /LC-500 dosage of 100 mg in a biphasic solvent system of volume ratio of water to tetrahydrofuran of 1:4. In addition, 3.0-SnO x /LC-500 exerts an excellent reusability in five-cycle experiment. Furthermore, SnO x /LC was characterized in detail using X-ray diffraction patterns (XRD), X-ray Photoelectron Spectroscopy (XPS) Brunauer-Emmett-Teller (BET), ammonia temperature-programmed-desorption (NH 3 -TPD), pyridine adsorption infrared spectroscopy (Py-FTIR), scanning electron microscope (SEM) and thermal gravimetric analysis (TGA). Results indicate that Brønsted acid sites and Lewis acid sites coexist on 3.0-SnO x /LC-500, and more Sn 4+ as well as proper ratio of weak acidity to medium acidity are conductive to its catalytic performance in glucose-to-5-HMF reaction.
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IRANIAN POLYMER JOURNAL
·
2025
·
IF 2.8
Chen Shuhua,Wang Shufeng,Yue Lichun,Li Xiuping
Improving the piezoelectric and mechanical properties of polymer piezoelectric materials is an urgent research work for their application as piezoelectric materials. Thus, in this work, a new polymer piezoelectric material, esterified lignin-modified polyacrylonitrile (PAN/CEHL-PTMG), is successfully synthesized and the related piezoelectric composite nanofiber membrane is prepared by electrospinning. The structure of the membranes is well characterized by Fourier transform infrared spectrometer (FTIR), X-ray diffractometer (XRD), field emission scanning electron microscopy (SEM). The output voltage can reach as high as 1.47 V (64.63% higher than that of the pure polyacrylonitrile membrane) by optimizing the spinning solution (2% esterified lignin). The results indicated that the piezoelectric property of polyacrylonitrile (PAN) is remarkably improved by the incorporation of esterified lignin (CEHL-PTMG). In addition, a simple energy-conversion performance test is conducted, through which the prepared piezoelectric elements with PAN/CEHL-PTMG show the mechanical movement of the arm and finger. It is verified that the PAN/CEHL-PTMG piezoelectric element can complete the energy conversion well in practical application. The results indicated that an appropriate amount of CEHL-PTMG was conducive to the transformation of the planar sawtooth conformation in the microstructure of the polyacrylonitrile nanofibers. Meanwhile, mechanical tests exhibited that the CEHL-PTMG also could effectively enhance the tensile strength and elongation of the membranes. Graphical abstract
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Dezhan Ye,Jinfeng Kong,Shaojin Gu,Yingshan Zhou,Caoxing Huang,Weilin Xu,Xi Zhang
Even with outstanding radical capturing ability, the utilization of lignin as a natural antioxidant in polypropylene (PP) still has been pended. Usually, the compatibility of its blends is improved based on the reaction of hydroxyl content, thus leading to the decreasing content of phenolic hydroxyl (Ph-OH) group and inferior thermal-oxidative stability of lignin blends. Here, the selective aminolysis of acetylated Kraft lignin (pyr-KL) was investigated, which structures were characterized using FTIR, 31 P-NMR and GPC. The Ph-OH group of acetylated KL could be released by the addition of pyrrolidine; however the aliphatic hydroxyl group is still blocked. With the control of reaction conditions, the highest oxidation induction time of pyr-KL/PP (0.5 wt% loading) reaches up to 22.6 min, almost 2.6 times than that of pure PP. More importantly, the mechanical properties of PP were also maintained under the loading of pyr-KL, which is much better than that of curde KL/PP.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Danning Wang,Yuanjie Gu,Long Cheng,Shijing Sun,Weisheng Yang,Shuijian He,Shaohua Jiang,Hongqi Dai,Qinglin Wu,Huining Xiao,Jingquan Han
Traditional electrode materials for supercapacitors often face issues like high toxicity, cost, and non-renewability. To address these drawbacks, biomass-based alternatives are being explored, aligning with green development trends. Herein, carbonized wood (CW) with rich pore structure and redox-active lignin are combined to fabricate an all-wood-based sustainable supercapacitor electrode material. Due to its inherent porous structure, CW provides a larger surface area for accommodating active materials ion, enabling the electrode to achieve a higher lignin loading capacity of 2.82–11.68 mg/cm 2 . Furthermore, the utilization of lignin as a substitute for conventional transition metal-based pseudocapacitor material functionalized CW endows the electrode with exemplary electrochemical performance while guaranteeing the comprehensive sustainability of the electrode. This synergy confers the electrode with exceptional electrical performance, yielding an areal capacitance of 960.7 mF/cm 2 at a current density of 1 mA/cm 2 . The symmetric supercapacitors (SSC) manufactured by this composite electrode can achieve a notable areal energy density of 0.14 mWh/cm 2 and a power density of 15.98 mW/cm 2 , while maintaining an outstanding capacitance retention rate of 81 % after 50,000 cycles at 20 mA/cm 2 . The manufacture of CW-lignin electrode underscores the potential of utilizing renewable biomass resources as alternatives for developing high-performance energy storage applications, thereby reducing negative environmental impacts.
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Molecular Catalysis
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2024
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IF 3.9
Yin Wang,Haihong Xia,Fei Ge,Yanrong Wang,Xiaohui Yang,Jianchun Jiang,Minghao Zhou
The catalytic conversion of 5-hydroxymethylfurfural (5-HMF) to value-added chemicals was quite vital for the conversion and utilization of biomass resources. The development of novel and efficient catalysts was of great significance. In this work, a series of tannic acid doped catalysts (Ni-Co/TA@C) were prepared by hydrothermal self-assembly method using lignosulfonate as a building block and coordinating with metal ions Ni 2+ and Co 2+ . The effects of different preparation conditions and reaction conditions on the performance of the catalysts were investigated, and the optimal conditions for catalytic transfer hydrogenation were also explored. The results showed that the conversion of 5-HMF was 99.97% and the yield of 2,5-dimethyl furan (DMF) was as high as 87.10% with Ni 2 Co/TA@C as catalyst under mild reaction conditions (240 °C, 2 MPa N 2 , 4h). The surface morphology, surface area and composition of the catalysts were characterized in detail. The Ni 2 Co/TA@C catalyst had higher total acidity and larger amount of strong acid sites, which was conducive to highly selective catalytic transfer hydrogenation (CTH) of DMF, and the larger specific surface area also promoted the dispersion and loading of Ni and Co. This study provided some novel findings for the construction of catalysts for biomass conversion.
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IRANIAN POLYMER JOURNAL
·
2024
·
IF 2.4
Shi Liang,Shen Xue,Qi Hongyun,Zhang Xiaomei,Shu Ruiwen
A novel lignin-based magnetic composite was synthesized using a facile method, with epichlorohydrin (ECH) serving as a cross-linker to bond amino-functionalized magnetic nanoparticles (AMNP), polyethyleneimine (PEI), and sodium lignosulfonate (LS). The synthesized composite (AMNP/LS-PEI) was subjected to characterization through multiple analytical techniques, namely FTIR, XRD, BET, TG, VSM, XPS, FE-SEM, EDS, HRTEM, and TEM. Following the synthesis, a thorough investigation was conducted into the composite’s adsorption capabilities for methylene blue (MB) and methyl orange (MO) dyes through batch adsorption, taking into account pivotal factors, including pH, contact time, solution concentration, and temperature. The experimental data suggested that the adsorption of MO and MB onto AMNP/LS-PEI was in good accordance with the Langmuir isotherm model. The AMNP/LS-PEI demonstrated maximum adsorption capacities ( Q max ) of 482.7 mg g −1 for MO and 375.6 mg g −1 for MB, respectively. The MB and MO-adsorption kinetics onto AMNP/LS-PEI closely fit the pseudo-second-order model. Furthermore, the thermodynamic analysis revealed that the adsorption process of dyes onto AMNP/LS-PEI was an endothermic one. Upon six adsorption–desorption cycles, AMNP/LS-PEI demonstrated sustained adsorption capacity, achieving removal rates of 81.3% for MB and 77.1% for MO, respectively. The potential advantage for practical applications lied in its highly selective adsorption capability for mixed solutions of MB and MO. Specifically, at a pH of 4, MO was preferentially adsorbed, whereas at a pH of 8, MB was favored for adsorption. In addition, the adsorption mechanism of AMNP/LS-PEI toward dyes was explored using FTIR and XPS, and was found to be mainly ascribed to the electrostatic interaction, hydrogen bonding interaction, and cation exchange. Graphical abstract
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MOLECULES
·
2025
·Vol. 30
·期 3
·494
·
IF 4.6
Zhihao Ding,Rui Wang,Guoli Pang,Lili Dong,Tingzhou Lei,Suxia Ren
Porous carbon holds great potential for application in supercapacitors due to its rich pore structure and high specific surface area. In this research, lignin served as the starting material for the production of lignin-derived carbon materials via a carbonization-activation process. The resulting porous carbon materials underwent rigorous characterization using SEM, BET, Raman, XRD, and XPS to uncover their morphological and structural intricacies. Notably, the optimal product, achieved with a mass ratio of lignin to KOH and KCl at 1:2:0.5 and activation temperature at 700 °C, emerges as an excellent electrode material for high-performance supercapacitors. This superior carbon material boasts a remarkable specific surface area of 2730 m2g−1, demonstrating an electrochemical capacitance up to 406 F/g at 1 A/g, its high performance surpasses many existing carbon materials. To further investigate the potential application of ELC in electric double-layer capacitors, the electrochemical properties of ELC in 6 M KOH, 1 M Na2SO4, and 1 M Et4NBF4/PC electrolytes were investigated, the reasons for the differences in ELC’s electrochemical performance in different electrolytes are discussed and analyzed in detail, and the advantages and disadvantages of ELC’s performance in capacitor devices of different systems are compared and analyzed. This was performed to compare the electrochemical performance of ELC and commercial YP-50F capacitor carbon in an electric double-layer capacitor, and to investigate the potential application of ELC.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
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IF 8.5
Yuan He,Haichuan Ye,Haichao Li,Guohua Miao,Yucheng Hu,Xianhai Zeng,Tingting You,Feng Xu
Lignin nanoparticles (LNPs) are gaining attention for their renewability and environmental friendliness in advanced nanomaterials. To establish a new sustainable value chain, it is vital to fully utilize lignin resources and thoroughly examine the effects of LNPs size and structure on performance. Herein, a two-step fractionation scheme is engineered via combining sequential organic solvent fractionation and acid precipitation methods to obtain four lignin fractions (denoted as F1, F2, F3, and F4) with low heterogeneity, suitable hydroxyl content and the syringyl (S)/guaiacyl (G) ratio for LNPs fabrication. Up to 88.7 % of alkali lignin was collected to prepare LNPs, and the LNPs showed controllable sizes (100–500 nm, denoted as F1-LNP, F2-LNP, F3-LNP, and F4-LNP). The size gradually decreased from F1-LNP to F4-LNP with increasing specific surface area of LNPs, contributing to superior antibacterial and antioxidant properties. Notably, a higher S/G ratio with enriched p -hydroxyphenyl (H) units resulted in a smaller size of LNPs, possibly resulting from the greater attraction and larger binding energy between S-S and H-H than G-G. This work gives insights into the full utilization of technical lignin to nano-particles to meet specific performance requirements, which will particularly broaden the commercialization and high-value utilization of lignin.
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