CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Bole Ma,Fuquan Xiong,Hang Wang,Yan Qing,Fuxiang Chu,Yiqiang Wu
Exploring the tailorable and scalable production method of lignin micro-nanospheres (LMNS) have a significant meaning for expanding their application field. In this study, the fabrication of LMNS with a wide size-controlled range (∼30 nm to ∼3 μm) and high solid content (8 mg mL −1 ) by dynamics regulation in a γ-valerolactone/water binary system was reported. The LMNS could be controllably fabricated from nano to micron-scale by synergistically regulating four main dynamics factors, i.e., initial lignin concentration, lignin solution/water ratio, temperature of lignin solution and water, and sonication time. Moreover, the uniformity of the LMNS was effectively improved by centrifugation. The as-fabricated LMNS were further used to fabricate functional superhydrophobic coating on the surface of wood, with a water contact angle of 164.4° and a sliding angle of 5°. The coating showed excellent mechanical and chemical stability in a series of tests, especially good resistance to organic solvent. The coating also exhibited great photothermal effect, suggesting potential application in high-efficient deicing and antibacterial. This study not only provides a green and effective strategy for tailorable and scalable production of LMNS, but also presents an innovative concept for LMNS to fabricate the functional superhydrophobic coatings with organic solvent resistance and photothermal effect.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Kai-Li Wu,Wen-Wen Zhang,Tong-Bao Jiang,Ming Wu,Wei Liu,Han-Min Wang,Qing-Xi Hou
As a green sustainable material, lignin-derived porous carbon (LPC) exhibits great application potential when used as the anode material in lithium-ion batteries (LIBs), but the applications are limited by the heterogeneity of the lignin precursor. Therefore, it is crucial to reveal the relationship among lignin properties, porous carbon structure and the kinetics of lithium-ion storage. Herein, LPCs from fractionated lignin have been prepared by an eco-friendly and recyclable activator. The structure of the LPCs was regulated by adjusting the molecular weight, linkage abundance and glass transition temperature ( T g ) of lignin macromolecules . As the anode material of LIBs, the prepared 3D flower-like LPC E70 could achieve a reversible capacity of 528 mAh g −1 at a current density of 0.2 A g −1 after 200 cycles, 63 % higher than that of commercial graphite. Furthermore, kinetic calculations of lithium-ion storage behavior of LPCs were firstly used to confirm the contribution ratio of diffusion-controlled behavior and capacitive effect. Lignin with a high linkage abundance could yield LPC E70 with the largest interlayer spacing and specific surface area to maximize lithium-ion storage from both diffusion-controlled and capacitive contributions of specific capacities. This work provides a green, facile and effective pathway for value-added utilization of lignin in LIBs.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Jing Chen,Jialong Wu,Yinyan Zhong,Xiaozhen Ma,Wanrong Lv,Honglong Zhao,Jin Zhu,Ning Yan
Superwettability can affect the performance of oil separation from water during the treatment of oily wastewater. Among various types of materials developed for cleaning oil pollution, foam is a popular choice due to its attractive lightweight properties and adjustable porosities. Foams with superwetting surfaces (superhydrophilic/superoleophobic underwater) are ideal for oil/water separations. In this study, lignin-based polyurethane foams (LPUFs) were synthesized first, and then polydopamine particles were deposited on the surface of the foam by in situ polymerization under weak alkaline conditions to increase its surface roughness. Afterwards, phytic acid was used to modify the foam to achieve surface superhydrophilicity and underwater superoleophobicity. Successful loading of polydopamine (PDA) particles and coating of phytic acid (PA) onto the foam was demonstrated by SEM, EDS, FTIR, XPS, and thermogravimetric analysis measurements. It was shown in the cyclic compression tests that LPUFs had good mechanical properties. Under 75 % compression strain, the maximum stress in the first cycle of LPUF/PDA/PA was 105.92 kPa. After 30 cyclic compression tests, the maximum stress of LPUF/PDA/PA under 75 % compression strain was 105.63 kPa, demonstrating a high mechanical stability. The contact angle of the foam modified by PDA and PA was 0° for water, 166.7° for chloroform, and 158.4° for hexane, which also demonstrated excellent underwater anti-oil adhesion performances. Oil-water separation tests by using PDA and PA modified lignin-based foam with mixtures of water and n -hexane, cyclohexane, toluene, and pump oil indicated a separation efficiency of over 99 % for the types of mixtures tested together with excellent repeatability. In addition, the PDA and PA modified lignin-based foams were able to adsorb 67.1 mg/g of methylene blue, 96.1 mg/g of rhodamine B, and 98.2 mg/g of copper sulfate. The lignin-based foam could completely degrade under weak alkaline conditions after usage. This study highlighted a novel strategy for synthesizing environmentally friendly high-performance adsorbents to efficiently treat polluted wastewater using lignin as a raw material.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Shuai Wang,Dayi Guo,Rui Kang,Junfeng Feng,Hui Pan
A series of mesoporous carbon/magnesium oxide composites (LDMC@MgO-x) with different Mg doping ratios were synthesized by using alkali lignin as the carbon source, potassium chloride as the salt template and magnesium nitrate as the catalytic site precursor, respectively. The BET, FTIR, SEM, and TEM analyses indicated that the as-prepared LDMC@MgO-x possessed a unique hierarchical porous structure with high specific surface area, rich functional groups, and uniformly distributed MgO nanoparticles. Among them, LDMC@MgO-20%, as an optimized base catalyst, could realize effective isomerization of glucose with a maximum fructose yield of 34.4 % in water at 130 °C for only 5 min under microwave assistance. In addition, the activation energy of glucose isomerization catalyzed by LDMC@MgO-20% was estimated to be about 43.6 kJ·mol −1 , which was lower than that of most Lewis acid-catalyzed systems.
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高影响因子
FUEL
·
2023
·
IF 7.4
Zhuojie Zhong,Bowen Luo,Chengyin Lin,Tao Yin,Zhipeng Tian,Chao Wang,Ying Chen,Yanxue Wu,Riyang Shu
An ultrafast preparation method that coupled the photochemical method with the microfluidic technology to synthesize the highly dispersed Ru/TiO 2 catalyst within only 1 min was proposed. This method had an enhanced electron excitation and a high electron transfer efficiency during the preparation process due to the small dimension of the microchannel, which enabled to shorten the preparation time greatly. Much higher metal reduction efficiency was obtained than that of the single photochemical method, and a high Ru metal dispersion on the TiO 2 surface can be achieved. Moreover, a strong interaction between the metal site and the support was formed, resulting in more spillover hydrogen. This Ru/TiO 2 catalyst presented a high activity on the HDO of phenolic compounds. Guaiacol was converted into cyclohexane with 97.6 % selectivity at 260 °C. The raw lignin-oil also can be upgraded efficiently, with the hydrocarbon content increased from 6.7 % to 69.4 %.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Jianglin Liu,Linjun Wu,Dalang Chen,Quanzhou Xu,Liheng Chen,Xuliang Lin,Yanlin Qin
The electrocatalytic hydrogen production technology using green energy can reduce the dependence on traditional fossil fuels and the net emission of carbon dioxide. However, the high overpotential and low efficiency of the oxygen evolution reaction (OER) on the anode limit the overall water splitting. Here, carboxylic acid ligands with coordination function were designed and synthesized by modifying the surface functional groups of lignin. Bimetallic functionally-doped lignin-derived carbon materials (Fe 4 Ni 4 @NC) were synthesized by continuous ion layer adsorption and pyrolysis process using Fe and Ni transition metals as source and template. The catalyst requires only 214 mV of overpotential to produce 10 mA·cm −2 , which has much faster catalytic kinetics. Theoretical calculation shows that the energy barrier of rate-determining step in OER is reduced by appropriate feed ratio and nano-size. The facile strategy opens up an economical and efficient solution for designing OER electrocatalysts with high catalytic activity and excellent stability.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Jiubing Zhang,Yuanyuan Ge,Zhili Li
Constructing an advanced catalytic system for the purposeful liquefaction of lignin into chemicals has presented a significant prospect for sustainable development. In this work, the catalytic process of mesoporous homologous biochar (HBC) derived from alkali lignin supported copper catalysts (Cu/HBC) was reported for catalytic liquefaction of alkali lignin to monophenols. The characterization results revealed HBC promoted the formation of metal-support strong interaction and the generation of oxygen vacancies , enhancing the acid sites of Cu/HBC. Under the optimal conditions (0.2 g alkali lignin, 280 °C, 0.05 g Cu/HBC, 6 h, 18 mL water), the monophenol yield reached 75.01 ± 0.76 mg/g, and the bio-oil yield was 57.98 ± 1.76%. The copious mesopores, high surface area, and rich acidic sites were responsible for the high activity of Cu/HBC, which significantly outperformed the controlled catalysts, such as HBC, commercial activated carbon (AC), and reported Ni/AC, Ni/MCM-41, etc. In four consecutive runs, the catalytic performance of Cu/HBC was only reduced by 3.65% per cycle. Interestingly, catechol was selectively produced with Cu/HBC, which provided an effective strategy for the conversion of G/S-type lignin to catechyl phenolics (C-type). These findings indicate that the Cu/HBC will be a promising substitution of noble metal-supported catalysts for conversion biomass into high value-added phenolics.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
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IF 4.1
Zhong Dai,Yazeng Zhang,Yin Ma,Ying Wu,Chuyu Miao,Yuchun Li
The development of multifunctional composites is a challenging but necessary path for the miniaturization and integration of electronic products. Herein, versatile bimetal hydroxide (NiCo 2 (OH) 6 ) nanowires coated on TiO 2 modified lignin based carbon nanofibers (CNFs/TiO 2 @NiCo 2 (OH) 6 ) have been prepared successfully by the method of electrospinning followed by hydrothermal treatment . The loading of NiCo 2 (OH) 6 , the doping of N, and the modification of TiO 2 endow the CNFs/TiO 2 @NiCo 2 (OH) 6 with multifunctional application in energy storage and microwave absorption (MA). The abundant pores and active sites result in an excellent electrochemical performance with a high specific capacitance of 752.47 F g −1 at 1 A g −1 . More importantly, the assembled supercapacitor exhibits a maximum energy density of 60.64 Wh kg −1 and a superior stability of 90.2 % even after 4000 cycles at the current density of 10 A g −1 . Moreover, considering the unique porous layered-structure as well as eminent electromagnetic matching properties, as-prepared composites display an excellent MA property , which possesses a minimum reflection loss (RL min ) of −46.48 dB and a maximum effective absorption bandwidth (EAB, RL < 10 dB) of 2 GHz (covering 47.62 % of X-band frequency). This work simultaneously delivers the potential application in the field of energy storage and MA.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 36
·17072-17079
·
IF 3.3
Hongmei Xie,Guozhi Zhu,Dawei Ye,Weiquan Cai,Junjie Zhang,Kangping Huang,Yuliang Mai,Bing Liao,Jiazhi Chen
Catechyl lignin (C-lignin) is a unique and attractive natural biopolymer used as raw material for the production of chemicals and materials due to its homogeneous linear aromatic structure. Tung nutshells, an important component of industrial solid waste, are rich in C/G-type Lignin. Herein, for the first time, we report that the catalytic oxidation strategy is effective for the conversion of Tung nutshell lignin to value-added C/G-type aromatic monomers using the commercially available CuCl2 catalyst. The reaction conditions, including solvent, temperature, and catalyst dosage, were comprehensively investigated. The optimal yield of 60.8 mg g−1 (or 12.9 wt% Klason lignin) C/G-type aromatic aldehydes and acids was obtained using the CuCl2 catalyst in the CH3CN/H2O (8/2, v/v) solvent mixture at 190 °C for 4 h. The C-type aromatic monomers were formed with an yield of 7.7 mg g−1 (or 1.6 wt%) in the initial 0.2 h and gradually decreased as the reaction progressed. The less amount of C-type lignin-derived aromatic monomers can be attributed to their lower thermal stability under oxidative conditions. The structural evolution study of lignin by GPC and HSQC NMR reveals that the C/G units are effectively depolymerized and transformed into aromatic aldehydes and acids by the CuCl2/CH3CN/H2O catalytic oxidative system.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Yong Liu,Xinghua Zhang,Lungang Chen,Jianguo Liu,Qi Zhang,Longlong Ma
This study explores the efficacy of a cost-effective Cu-ZnO-Al 2 O 3 catalyst for one-pot hydrodeoxygenation of guaiacol into hydrocarbons. Notably, complete conversion of guaiacol was achieved, yielding a 99.6% hydrocarbon over the robust Cu(6)Zn(3)Al(1) catalyst under the conditions of 4 MPa H 2 , 300 °C, and 8 h with a catalyst/guaiacol ratio of 0.5 g/1.0 g. In-depth catalyst characterizations unveiled the presence of oxygen vacancies within the ZnO surface layer, acting as pivotal active sites that facilitated the hydrodeoxygenation of guaiacol. Furthermore, Density Functional Theory (DFT) calculations were employed to evaluate several potential active sites, revealing that the oxygen vacancy of ZnO on the Cu surface played a crucial role. This vacancy enhanced the adsorption of intermediate cyclohexanol and markedly reduced the energy barrier for the rate-limiting step. This comprehensive investigation sheds light on the catalytic pathway and offers insights into designing efficient and sustainable biofuel production processes.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Pengfei Tang,Zhiqiang Wang,Chao Wen,Chuantao Yin,Yuxian Xing,Haoming Tai,Feng Jiang
With the increasing concern about global environmental issues, reducing the carbon footprint to achieve carbon neutrality has been particularly important. Sustainable multiblock copolymer elastomers (MBCPEs) have received tremendous interest due to their unprecedented performance and huge potential applications. However, complex multistep polymerization and postpolymerization processes are needed to design MBCPEs. In this work, a series of MBCPEs, in which vanillin acrylate (VA) derived from lignin was selected as the renewable rigid segments for the glassy block, while methyl acrylate (MA) was chosen as the soft segments for the rubbery block, were prepared by two successive reversible addition–fragmentation chain transfer (RAFT) polymerization processes with polytrithiocarbonate (PTTC). These thermally stable MBCPEs exhibit distinct microphase-separated morphology, where the hard poly(vanillin acrylate) (PVA) blocks self-assemble into discrete glassy domains serving as the physical cross-linking points in the soft poly(methyl acrylate) (PMA) matrix. The macroscopic mechanical performance, such as tensile strength, stretchability, toughness, and elastic recovery, can be adjusted well by changing the molecular weights and PVA contents. Moreover, these sustainable MBCPEs can be applied as strong adhesives and excellent UV-shielding materials, broadening their potential applications. This novel strategy is convenient and robust by combining RAFT polymerization and renewable resources toward high-performance MBCPEs, which can open a new avenue for the development of sustainable biobased elastomers.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Dan Meng,Hailiang Wang,Yuchun Li,Jian Liu,Jun Sun,Xiaoyu Gu,Haiqiao Wang,Sheng Zhang
A multifunctional lignin derivative nanoparticle (C-P-Lignin) was synthesized by grafting phenyl dichloro sphosphineoxid and 1, 4-dimethoxyacetylene stepwise on the lignin, then it was applied to prepare the thermoplastic polyurethane (TPU) composite with improved mechanical properties, oxidation resistance, and flame retardancy. The tensile strength , the elongation at break, and the toughness of the TPU/2C-P-Lignin sample reached 28.3 MPa, 941 %, and 139.0 MJ/m 2 respectively, which were increased by 39.0 %, 3.4 %, and 33.9 % respectively compared with that of the control TPU sample. The anti-fatigue property was also improved. More importantly, the mechanism of the improved mechanical properties was also calculated and simulated by FTIR and Materials Studio software. The TPU/2C-P-Lignin sample exhibited superior oxidation resistance during the process of photoaging and thermal oxidative aging. Furthermore, the peak heat release rate and the smoke production rate for theTPU/2C-P-Lignin sample was reduced by 50.0 % and 53.8 % compared with that of the control TPU. The reason was that the C-P-Lignin is conducive to the formation of uniformly distributed carbon layers. It is expected that this work can provide a new method for expanding the utilization of waste wood as a multifunctional lignin-based filler to improve fire safety and extend the service life of TPU polymers.
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高影响因子
危险品化学品经营许可证（带存储）