BIOMASS & BIOENERGY
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2022
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IF 5.774
Jie Zhang,Danyang Cao,Shanshan Wang,Xin Feng,Jiahua Zhu,Xiaohua Lu,Liwen Mu
In this study, heteroelement-rich groups (N and B elements, tris (2-hydrazinylethyl) borate) were successfully synthesised on lignin by microwave amination. The reaction between lignin and heteroelement-rich groups was confirmed using several characterization techniques, including fourier transform infrared (FT-IR) spectroscopy, thermogravimetric (TG) analysis, and X-ray photoelectron spectroscopy (XPS). A lignin model compound (2-phenoxyacetophenone (L-M)) was used to study the bond-breaking mechanism of lignin depolymerization , and the amine group, which acted as a nucleophile , attacked the C–C bond to form an amide bond with the lignin. As an effective additive, modified lignin can increase the viscosity of poly (ethylene glycol) 200 (PEG200), reducing the wear volume and friction coefficient in the friction test. Theoretical calculations showed that the polarity of the modified lignin increased, which allowed the modified lignin to form a strong physical adsorption on the metal surface. In addition, the reciprocal hydrogen bonding between the modified lignin and PEG200 contributes synergistically to the enhanced lubrication film strength , and thus, the better tribological properties of these new lubricants.
研究领域:
高分子化学
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材料科学
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绿色化学
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表面工程
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能源材料
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可持续技术
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高影响因子
Molecular Catalysis
·
2023
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IF 4.6
Haoquan Guo,Xinyu Lu,Yue Yang,Jinhe Wei,Lizhi Wu,Li Tan,Yu Tang,Xiaoli Gu
Alkyl phenol is an essential chemical intermediate that is in high demand in the chemical industry. The synthesis of alkyl phenols from lignin-derived molecules is one of the most promising routes for utilizing biomass resources. Herein, we report the catalytic hydrodeoxygenation (HDO) of dihydroeugenol (DHE) to alkyl phenols over a highly dispersed Pd/α-MoC catalyst with a substrate conversion of 98% and a selectivity of 96% to alkyl phenols. The Pd/α-MoC catalyst prepared by co-precipitation and temperature-programmed carbonization exhibits exceptional HDO activity under mild conditions with a low H 2 pressure (1–10 bars). The characterizations of the catalyst suggest that Pd are highly dispersed on the α-MoC matrix. The reaction mechanism was investigated using the substrate scope experiments. Under ambient pressure, the abundant oxygen vacancies and acidity sites on Pd/α-MoC enable the selective hydrodeoxygenation of lignin monomers.
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INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Qiufeng Deng,Rui Zhai,Baohua Chen,Xiaoxiao Jiang,Haixiang Li,Chen Li,Mingjie Jin
Developing value-added lignin-based biomaterials for enzyme immobilization has drawn great attention. This study developed a cost-effective and eco-friendly one-pot strategy to synthesize the rod-like lignin@zeolitic imidazolate framework-8 (ZIF-8) hybrid nanomaterial by using lignin derived from lignocellulosic biofuel production. The incorporation of lignin into the ZIF-8 network not only altered the morphology, but also modified the surface properties of the material, making it an ideal support for enzyme immobilization. The synthesized nanoscale hybrid materials were used to immobilize beta-glucosidase (BG) with high immobilization capacity and about 92–166 mg/g of BG was immobilized through physical adsorption. The immobilized BG exhibited good stability, catalytic activity and recycling properties, and was reused under acidic conditions for more than 8 cycles with more than 60% activity kept. The as-prepared hybrid material can serve as a great carrier for immobilizing various biomolecules.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 17
·e53786
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IF 3
Yue Gong,Lingying Fu,Zhiqiang Ou,Qi Zhou,Xin Rao,Songbin Wang,Chunqing Huo,Xueyu Du
As a key byproduct from alkaline pulping industry, alkaline lignin (AL) exhibits tremendous potentials for the development of high-value-added biomaterials, ascribed to its renewability and unique polymeric structure. In this study, the alkaline lignin was first oxidized and then modified with aminated nano-silica. After further hydrophobic modification with a silane coupling agent, a novel lignin-based filler was finally prepared and applied for property enhancement of PLA-based composite films. As revealed from SEM results that, a uniformed state of filler distribution could be achieved if the filler content is no more than 1%. Under this condition, the thermal stability of composite film could be effectively improved, as well as the enhancement of tensile strength (50.7 MPa) and Young's modulus (2847 MPa). Notably, the composite films also exhibit selective resistance against UV lights rather than visible lights, especially at higher filler content.
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Polymers
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2023
·Vol. 15
·期 7
·1693
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IF 5
Shuai Gao,Guoyu Tian,Yingjuan Fu,Zhaojiang Wang
Apple wood waste (AWW), mainly tree trucks, is collectible lignocellulosic biomass from orchard rotation. The biorefinery of AWW is challenging because of the hard and dense structure. In the present work, chemical composition determination and microstructure observation was performed for the first time on AWW. Alkali-preimpregnation-assisted soda cooking (APSC) was developed to separate cellulose a pulp and lignin from AWW. APSC attained pulp yield of 34.2% at 23% NaOH, showing a 13.2% improvement compared to conventional soda cooking (SC). Fiber length analysis showed APSC-AWW pulp consisted mainly of medium and short fibers, which means blending with long-fibered pulp to enhance the physical strength of pulp sheets. A blend of APSC-AWW pulp and long-fibered pulp in the proportion of 80:20 attained comparable physical strength to hardwood kraft pulp. ASPC-AWW lignin was separated from spent liquor by acidification and then purified by dialysis desalination. The purified ASPC-AWW lignin showed a weight-average molecular weight of 4462 g/mol, similar to softwood kraft lignin but more uniform. Structural analysis revealed that ASPC-AWW lignin was composed of a syringyl unit (S), guaiacyl unit(G), andp-hydroxyphenyl unit (H), and an S unit was dominant with an S/G/H ratio of 74.5:18.2:7.3. It is believed the utilization of fruit tree wood waste as the feedstock of biorefinery is attractive to countries without sufficient forestry resources. Furthermore, the developed APSC is based on conventional SC, which ensures the feasibility of an industrial application.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Lijun Guo,Liangqiong Peng,Jiheng Li,Wenhua Zhang,Bi Shi
Thorium (Th) and uranium (U) separation remains a huge challenge due to their high similarity in chemical behavior. In this study, lignin-derived magnetic biochar (AL-Fe/BC), which can provide functional sites for adsorbing Th(IV) and U(VI), was synthesized for the selective extraction of Th(IV) from the binary U(VI)-Th(IV) matrix. Characterizations results confirm the successful zero-valent iron loading, and the AL-Fe/BC exhibited a developed polyporous structure, high surface area, stable crystallinity, high defects degree, and advantageous magnetic feature of expedient recovery from water without energy consumption. The optimist AL-Fe/BC-800 showed an outstanding adsorption capacity with a maximal Th(IV) uptake of 2000 mg/g, and a small absorption of 3 mg/g of U(VI) (Th(IV) = 180 mg/L, U(VI) = 20 mg/L, AL-Fe/BC-800 = 0.05 g/L). Moreover, the separation factor of Th(IV) from the Th(IV)-U(VI) matrix reached 90,000 even concomitant with high a concentration of co-existing ions. The active adsorption sites on AL-Fe/BC-800, such as COOH, C-OH, C=O, pyridinic N, graphitic N, and pyrrolic N, exhibited a stronger binding affinity with Th(IV) than U(VI), achieving selective Th(IV) adsorption via a chemisorption process on the basis of competitive adsorption. In summary, AL-Fe/BC-800 is a potential adsorbent in industrial application for the superefficient separation of Th(IV) and U(VI) with high-performance magnetic recovery, promoting the sustainable development of nuclear industry, especially considering the necessary development of Th(IV) fuel.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Boyu Du,Hongwei Zhu,Jingyu Xu,Yating Bai,Qingyu Wang,Xing Wang,Jinghui Zhou
Recently, multifunctional lignin-based materials are gaining more and more attention due to their great potential for low-cost and sustainability. In this work, to obtain both an excellent supercapacitor electrode and an outstanding electromagnetic wave (EMW) absorber, a series of multifunctional nitrogen-sulphur (N-S) co-doped lignin-based carbon magnetic nanoparticles (LCMNPs) had been successfully prepared through Mannich reaction at different carbonization temperature. As compared with the directly carbonized lignin carbon (LC), LCMNPs had more nano-size structure and higher specific surface area. Meanwhile, with the increase of carbonization temperature, the graphitization of the LCMNPs could also be effectively improved. Therefore, LCMNPs-800 displayed the best performance advantages. For the electric double layer capacitor (EDLC), the optimal specific capacitance of LCMNPs-800 reached 154.2 F/g, and the capacitance retention after 5000 cycles was as high as 98.14 %. When the power density was 2204.76 W/kg, the energy density achieved 33.81 Wh/kg. In addition, N-S co-doped LCMNPs also exhibited strong electromagnetic wave absorption (EMWA) ability, whose the minimum reflection loss (RL) value of LCMNPs-800 was realized −46.61 dB at 6.01 GHz with an thickness of 4.0 mm, and the effective absorption bandwidth (EAB) was up to 2.11 GHz ranging from 5.10 to 7.21 GHz, which could cover the C-band. Overall, this green and sustainable approach is a promising strategy for the preparation of high-performance multifunctional lignin-based materials.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
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IF 8.2
Boyu Du,Lanfang Chai,Qian Zheng,Ying Liu,Xing Wang,Xiaohong Chen,Shangru Zhai,Jinghui Zhou,Run-Cang Sun
Multifunctional lignin-based adsorbents, which have shown great application prospect, have attracted widespread attention. Herein, a series of multifunctional lignin-based magnetic recyclable adsorbents were prepared from carboxymethylated lignin (CL), which was rich in carboxyl group (-COOH). After optimizing the mass ratio of CL to Fe 3 O 4 , the prepared CL/Fe 3 O 4 (3:1) adsorbent showed efficient adsorption capacities for heavy metal ions. The kinetic and isotherm nonlinear fitting studies revealed that the adsorption process followed the second-order kinetic and Langmuir models, and the maximum adsorption capacities (Q max ) of CL/Fe 3 O 4 (3:1) magnetic recyclable adsorbent for Pb 2+ , Cu 2+ and Ni 2+ ions reached 189.85, 124.43 and 106.97 mg/g, respectively. Meanwhile, after 6 cycles, the adsorption capacities of CL/Fe 3 O 4 (3:1) for Pb 2+ , Cu 2+ and Ni 2+ ions could keep at 87.4 %, 83.4 % and 82.3 %, respectively. In addition, CL/Fe 3 O 4 (3:1) also exhibited excellent electromagnetic wave absorption (EMWA) performance with a reflection loss (RL) of −28.65 dB at 6.96 GHz under the thickness of 4.5 mm, and its effective absorption bandwidth (EAB) achieved 2.24 GHz (6.08–8.32 GHz). In short, the prepared multifunctional CL/Fe 3 O 4 (3:1) magnetic recyclable adsorbent with outstanding adsorption capacity for heavy metal ions and superior EMWA capability opens a new avenue for the diversified utilization of lignin and lignin-based adsorbent.
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高影响因子
RENEWABLE ENERGY
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2022
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IF 8.634
Riyang Shu,Hao Jiang,Long Xie,Xiaozhou Liu,Tao Yin,Zhipeng Tian,Chao Wang,Ying Chen
Hydrodeoxygenation (HDO) is an effective technology for the conversion of bio-oil to high quality liquid fuels, in which an active and stable catalyst is crucial to gain a high reaction efficiency. In this work, a novel bifunctional catalyst of different Ru-based biochar catalyst coupled with silicotungstic acid (HSiW) was proposed to conduct the HDO of lignin-derived phenolic compounds under mild reaction condition. Ru/C-bamboo catalyst exhibited a better HDO performance than other Ru-based biochar catalysts and commercial Ru/C catalyst. Catalyst characterizations showed that Ru/C-bamboo catalyst possessed a rich mesoporous structure of 0.06 cm 3 /g mesopore volume and 0.07 cm 3 /g micropore volume, with a large specific surface area of 209 m 2 / g. A high metal dispersion and a good hydrogen adsorption ability were achieved in Ru/C-bamboo catalyst. And Guaiacol can be completely converted to cyclohexane with 87.7% selectivity at the temperature of 140 °C. Other typical phenolic compounds were also transformed into corresponding cycloalkanes with high yields above 90% in most cases. Besides, the lignin-oil also had a great improvement on the stability and the heat value after upgradation, with an increase of hydrocarbon content from 9.7% to 31.9%. This result indicated the potential of the bifunctional catalyst in the field of lignin-oil valorization.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Zhenjiang Zhou,Sheng Li,Yiyuan Zou,Lin Lei,Yun Zhou,Damao Wang,Fayin Ye,Guohua Zhao
In the present work, lignin nanospheres (LNS, average diameter 166.43 nm) were prepared and the affecting parameters, the absorbed types, and mechanisms of their interactions with type-A gelatin (AG) were explored. The findings demonstrated that upon AG coating, the ζ -potential of LNS sharply decreased and concluded a negative-to-positive shift, while the average diameter and polydispersity index increased significantly. AG presented the highest coating capacity (0.32 mg/mg, db) onto LNS (0.5 mg/mL) at an optimum pH of 4.0 and an AG concentration of 1.0 mg/mL. The adsorption of AG onto LNS could be well described by the Hill model ( R 2 = 0.9895), which was characterized as positive synergistic adsorption by the Hill coefficient (1.32) and physical adsorption by the free energy (3.70 kJ/mg). The spectral analysis revealed that the interactions between AG and LNS were mainly driven by electrostatic forces (Δ G < 0, Δ H < 0, and Δ S > 0) together with the assistance of hydrogen bonds and hydrophobic interactions, which companied a decrease of α -helix (4.04 %) and β -turn (0.60 %) and an increase of β -sheet (3.10 %) and random coil (1.53 %) of the secondary structure of AG. The results herein certainly favored the hydrophilic/hydrophobic change of LNS/AG and the quality control of a binary system consisting of lignin and gelatin.
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Journal of Water Process Engineering
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2023
·
IF 7
Shilin Chen,Qizhao Shao,Ling Hu,Zhenrong Tan,Dafeng Zheng
Oil leakage has caused great damage to the marine aquatic environment. Cellulose aerogels can be used to separate oil/water mixture, but the low strength and recyclability have restricted its application. In order to improve the performance of cellulose-based aerogels , hydrophobic and magnetic modification with ultrasound enhancement was carried out. Firstly, hydroxyethyl cellulose-lignin aerogel (CL-aerogel) was synthesized by combining hydroxyethyl cellulose with lignin through sol–gel method with freeze-drying. The incorporation of lignin endowed the aerogel with a 3D porous network and enhanced mechanical properties. Then CL-aerogel was modified with n-dodecyl mercaptan (NDM) and Fe 3 O 4 NPs through ultrasound enhancement to obtain HMCL-aerogel. The results disclosed that with the increase in NDM usage and ultrasound time, the hydrophobicity and magnetic responsiveness of aerogel was enhanced. Furthermore, HMCL-aerogel had good oil absorption capacity with high selectivity . The HMCL-aerogel could be easily recycled by an external magnetic field and could be reused through a simple extrusion treatment. Meanwhile, the aerogel exhibited effective separation of oil/water mixture with a flux as high as 2986 L‧m −2 ‧h −1 even in corrosive conditions and maintained over 99 % separation efficiency after 10 separation cycles. Therefore, the hydrophobic and magnetic hydroxyethyl cellulose-lignin aerogel could potentially serve as an intriguing candidate for practical oil-polluted wastewater remediation.
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Catalysis Science & Technology
·
2022
·Vol. 13
·期 2
·468-478
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IF 6.177
Xinyu Lu,Xiaoli Gu
The chemical demand for alkyl phenols (mainly extracted from fossil-derived resources) has been increasingly growing, which has accelerated global energy shortages. Due to the inherent aromaticity of lignin, its effective conversion into alkyl phenols is central to its adoption as a sustainable precursor to produce biochemicals. In this study, catalytic transfer hydrogenation (CTH) of alkali lignin was carried out in a mixed medium (isopropanol/formic acid) at 240 °C for 8 h over a series of bimetallic Ni based catalysts. The acidity and reducibility of the as-prepared catalysts are enhanced via WO3 introduction (to form a WO3–Al2O3 mixed support) and a bimetallic synergistic effect, respectively, leading to improved catalytic activity and selectivity towards alkyl phenols. Different kinds of phenolic compounds (e.g., those with substitutions of methoxyl, alkyl, alkenyl, carbonyl, carboxyl, or hydroxyl groups) were generated over these bimetallic Ni based catalysts with various combinations of Ni + Fe/Zn/Co/Mo/Cu, which was due to their own catalytic promotion of certain reactions (e.g., hydrogenation, deoxygenation, and/or hydrogenolysis). Reaction mechanisms of lignin depolymerization were proposed according to the distribution of phenolic compounds. This work provides a comprehensive investigation on yielding alkyl phenols from lignin CTH over a series of inexpensive bimetallic Ni based catalysts (Ni/(Fe/Zn/Co/Mo/Cu)–WO3/Al2O3), and undertook a catalytic evaluation of the bimetallic synergistic effects on improving the chemical selectivity towards alky phenols, which is beneficial for lignin valorization.
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