ADVANCED FUNCTIONAL MATERIALS
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2023
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IF 19
Yong Zheng,Hai Liu,Li Yan,Haiyue Yang,Lin Dai,Chuanling Si
Room-temperature liquid metals (RTLMs) have excellent shape reconfiguration capabilities, which make them ideal for flexible electrodes, sensors, and energy devices. However, due to the high surface tension and weak adhesion of RTLM, the types of printing substrates, patterning, and recovery processes are limited. It is essential to develop advanced encapsulation techniques for the patterning of RTLMs. Lignin has great potential for promotion as nanodispersants and nanocarriers because of its abundant hydroxyl groups and good self-assembly properties. In this work, a green and facile encapsulation method using industrial lignin is reported for stable, uniform, and reproducible patterning of eutectic gallium–indium (EGaIn). Lignin-encapsulated EGaIn particles exhibit good stability and can be patterned on the surface of various substrates with a simple ballpoint pen. The electrical resistance of the conductive tracks shows little change under bending and twisting (720°) conditions. More importantly, the lignin-encapsulated system can be easily dissolved and regenerated, which is also supported by molecular dynamics simulations and density functional theory calculations. 96.9% of the EGaIn can be recovered from the system. These characteristics make it very environmentally friendly throughout the preparation process and find applications in flexible sensors, transient circuits, and many other areas.
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高影响因子
FUEL
·
2023
·
IF 7.4
Deshi Yang,Jianpeng Huang,Zhipeng Hu,Yuanyuan Miao,Fengqiang Wang,Zhijun Zhang,Yanjun Xie,Shouxin Liu,Qingwen Wang,Charles U. Pittman
Lignin is the most abundant aromatic biopolymer. Thus, preparation of BTX (benzene, toluene and xylenes) by catalytic fast pyrolysis (CFP) of lignin is attractive. Ni-Al mixed metal oxide (MMO) catalysts, derived from pyrolyzing Ni-Al layered double hydroxides (LDH), were prepared for the catalytic fast pyrolysis of lignin. The effects of catalyst Ni/Al ratio, catalyst dosage and pyrolysis temperature on the liquid products were investigated by Py-GC/MS. The Ni 3 Al 3 -MMO produced the best liquid product distribution from lignin at 700 ℃. The selectivity of Ni 3 Al 3 -MMO for aliphatic hydrocarbons and monocyclic aromatic hydrocarbons (MAHs) was 18.0% and 78.2%, respectively. The selectivity to polyaromatic hydrocarbons (PAHs) was 3.8%. No phenols and phenolic derivatives were produced. This is related to the mesoporous catalytic structure (pore size of 14.37 nm), large external surface area (134.74 m 2 /g) and strong acidity (4.92 mmol NH3 /g) of Ni 3 Al 3 -MMO. In addition, a mechanistic study was performed with the lignin model compound (guaiacol) showing that Ni 3 Al 3 -MMO exhibits strong deoxygenation activity for aromatic C–O bond cleavage of lignin.
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高影响因子
Molecular Catalysis
·
2023
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IF 4.6
Donglin Huang,Wulin Song,Hongmei Zhao,Meng Li,Liang Wei,Hongxi Zhang
There are limited renewable sources of aromatic chemicals, with lignin being one of the most prominent, accounting for approximately 30% of the planet's organic carbon. Due to its intricate and irregular structure, lignin is recalcitrant to chemical conversion, often resulting in low yields of mixtures of products when it is depolymerized. This study synthesized a CeO 2 /AC catalyst via an impregnation technique and then explored its ability to depolymerize lignin via an oxidation-reduction strategy. The CeO 2 /AC catalyst efficiently depolymerized lignin by an oxidation-reduction strategy. At 200 °C, an argon pressure of 1 MPa, and a reaction time of 4 h, the conversion of the lignin model compound reached 98.5%. When using lignin derived from poplar, birch, pine, and cotton stalk, the total yields of phenolic monomers were 36.2 wt.%, 31.2 wt.%, 17.4 wt.%, and 12.1 wt.%, respectively. The CeO 2 /AC catalyst exhibited a higher surface oxygen vacancy concentration than CeO 2 , which was crucial for facilitating the hydrogenolysis of lignin.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
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IF 6.6
Min Guan,Xingye An,Zhengbai Cheng,Haibing Cao,Junwei Li,Liqin Liu,Hongbin Liu
The heterogeneity of lignin, due to its intricate chemical composition and inconsistent molecular weight distribution across various sources, would result in inconsistent materials with unpredictable characteristics, thus presenting a significant obstacle and impeding the advancement of lignin-based products. The need for innovative rosin/lignin-based sizing agents for liquid packaging board (LPB) products has yet to be fulfilled, stimulating ongoing research efforts in this area. Herein, to tackle the urgent challenge posed by the lignin inhomogeneity and its effect on sizing performance, we propose a comprehensive approach for the production of fractionated lignin-modified rosin sizing agents for liquid packaging board (LPB) with improved sizing characteristics. This study first fractionated three lignin components from wheat straw-derived lignin and utilized them as adaptable surfactants in the manufacture of cationic dispersion rosin sizing agents. The resulting agents were analyzed and evaluated for their utilization in LPB sizing process, exhibiting improved homogeneity, molecular weight, and hydrophilic group content. The obtained fractionated lignin-modified rosin sizing agents displayed outstanding sizing performance and desirable stability. Additionally, these agents enhance the mechanical and optical properties of LPB products. This study proposed a novel and valorized approach to apply lignin biomass with a fractionation and sustainable method to prepare series lignin-modified rosin sizing agents and their great potential in liquid packaging board applications.
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高影响因子
JOURNAL OF POLYMER SCIENCE
·
2023
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IF 3.4
Jun He,Nan Lan,Huaibo Yu,Dayue Du,Hanna He,Chuhong Zhang
Lignin, a biomass derived polymer, has gained considerable recognition as a highly promising precursor of hard carbon primarily due to its ample reserve, eco-friendliness, and cost-effectiveness. However, lignin-derived hard carbon via direct carbonization generally yields suboptimal performance for sodium storage due to the unsuitable microstructure. Herein, a simple phytic acid activation combined high-temperature annealing strategy is proposed to regulate the microstructure of lignin-derived hard carbon for high-performance sodium-ion batteries (SIBs) anode. Phytic acid activation not only reduces the ordering and creates abundant closed pores through improving the crosslinking degree and thermal stability of lignin but also introduces P heteroatoms to effectively expand the interlayer spacing of the derived hard carbon. High-temperature carbonization further increases the size of closed pores, leading to a more favorable sodium storage in the plateau region. Consequently, the optimal phytic acid activating lignin derived hard carbon (PLHC 1300) delivers a high capacity of 380.3 mAh g −1 with an enhanced plateau capacity ratio of near 68.1% at 30 mA g −1 , and achieves a capacity retention of near 100% after 150 cycles at 1 A g −1 . This work significant advances the application of lignin in energy storage and contributes to the progression of commercial SIBs. Graphical
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高影响因子
RENEWABLE ENERGY
·
2021
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IF 8.001
Feng Lin,Yulong Ma,Yonggang Sun,Kanghe Zhao,Tingting Gao,Yingbo Zhu
Due to the inertness and structural complexity of lignin, upgrading lignin to biofuels and fine chemicals still faces great challenges. In this paper, a one-pot method was used to catalyze straw lignin with H-ZSM-5 supported by Ni and Ru bimetals, and the lignin conversion rate reached 88.1%. The yield of monophenol was 19.5%, of which the yield of 4-ethylphenol and 4-ethylguaiacol was 4.9% and 3.8%, respectively. The 2D HSQC NMR analysis confirmed that the Ni–Ru/H-ZSM-5 catalyst had an obvious activity of breaking C β -O bonds before and after the reaction. The result showed that after loading metal Ni and Ru, the Lewis acid of the catalytic system was greatly increased, which caused electron transfer between Ni and Ru. 3Ni-1.5Ru/H-ZSM-5 had the strongest activity due to the largest synergy among Ni, Ru and H-ZSM-5. The synergy was the key factor leading to the cleavage of C–C and C–O bonds in straw lignin and the high-performance catalytic degradation of lignin. Besides, the effect of reaction solvent and hydrogen resource on upgrading lignin to fine chemicals over 3Ni-1.5Ru/HZSM-5 catalyst was also intensively investigated. This research developed a method for the direct conversion of lignin into valuable monophenols.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Haixu Wang,Dongjie Yang,Wenlong Xiong,Weifeng Liu,Xueqing Qiu
Nano silica (SiO 2 ) is usually used as a common reinforcing agent in polymer materials, in which the interfacial interaction greatly affects the mechanical properties of the composites. The reinforcement effect of silica on non-polar polymer is restricted due to their poor compatibility. In this work, amphipathic lignin modified by quaternization and alkylation was used as a modifier for silica to prepare hydrophobic lignin/SiO 2 nanoparticles by in-situ one-pot co-precipitation method. In alkaline solution, hydrophobic lignin and SiO 2 (from Na 2 SiO 3 ) were self-assembled to form nanospheres through electrostatic and hydrophobic interactions. The results showed that the lignin/SiO 2 nanoparticles were highly hydrophobic nanospheres with macropores in the surface. When the lignin/SiO 2 nanoparticles (10 wt%) were added to reinforce high-density polyethylene (HDPE), the mechanical properties of HDPE were improved with the strength of 24.5 MPa and the elongation of 1096%, which were increased by 10.4% and 14.3% compared with the control HDPE, because of the good compatibility and large bonding area. This work puts forward a new solution for the application of lignin in reinforcement of non-polar polymers.
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PubMed
高影响因子
LANGMUIR
·
2021
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IF 3.882
Yingying Chai,Yuefei Wang,Bingqi Li,Wei Qi,Rongxin Su,Zhimin He
In this work, lignin/chitosan nanoparticles (Lig/Chi NPs) with controlled structures were synthesized in a simple and scalable microfluidic system. When the positively charged chitosan and the negatively charged lignin solution were blended in a microreactor, Lig/Chi NPs were rapidly formed via the electrostatic coassembly between the amino groups of chitosan and the carboxyl groups of lignin. The ζ potential changes from negative (−13 mV) to positive (+54.5 mV) for Lig NPs and Lig/Chi NPs, respectively. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results demonstrated that Lig/Chi NPs have an average particle size of about 180 nm, which can be used as nanocarriers for drug delivery. The anticancer drug nanoparticles with docetaxel (DTX) and curcumin (CCM) were prepared by coassembly with Lig/Chi NPs in a microreactor, which had good drug loading efficiency, biocompatibility, and can release drugs in response to pH in the weakly acidic environment of the tumor. The drug release amounts in acidic solutions that simulated the tumor microenvironment were 51% (DTX@Lig/Chi NPs) and 50% (CCM@Lig/Chi NPs), respectively, which were better than the release amounts at pH 7.4, and have an obvious killing effect on HeLa cells.
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高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 133
·期 1
·371-382
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IF 2.081
Song Wenjing,Song Mengxue,Jiang Xingmao,Yi Xiaodong,Lai Weikun
Hydrolytic cleavage of C–O bond was systematically studied in acidic/alkaline aqueous solution. For phenethoxybenzene (PEB) hydrolysis, 2-phenylethanol and phenol were formed as main products in AlCl 3 solutions, whereas styrene was preferred with Na 2 CO 3 . After a quantitative evaluation of the kinetics of elementary steps, it was concluded that both AlCl 3 and Na 2 CO 3 promoted protons assisted C–O bond scission in H 2 O, whereas alkaline enhanced the dehydration of produced 2-phenylethanol. Kinetic and isotope labeling experiments demonstrated that the hydrolytic rates of PEB were first order with respect to substrate concentrations, hydrolytic cleavage of C–O bond was rate-determining step. The study shed light on the promotional effects and hydrolytic mechanism over acid/base-catalyzed lignin depolymerization in water. Graphic abstract
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
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IF 5.645
Xiaotong Fu,Hairui Ji,Xiaohui Liu,Wenyuan Zhu
Herein, a physicochemical pretreatment method, namely, a combination of recyclable acid hydrotrope ( p -toluenesulfonic acid, p -TsOH) treatment and ultrasonic treatment (10 s), was employed to extract lignin-containing fibers (LFs) from wood material ( poplar ). The LFs were used to produce reinforced polyvinyl alcohol (PVA) hydrogels via a dissolution-regeneration process in LiBr⋅3H 2 O solution. After coating the produced hydrogel on the end face of a single-mode fiber (SMF), a fiber-optic relative humidity sensor (FORHS) was fabricated to monitor environmental humidity. A high sensitivity (4.7 dB) and good repeatability ( R 2 = 0.98, the confidence factor) were found within a humidity range from 45 % to 80 %. Therefore, this study provides a sustainable approach for valorization of lignocellulosic biomass.
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高影响因子
ACS Applied Energy Materials
·
2021
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IF 6.024
Xiangchen Kong,Chao Liu,Baolong Wang,Weicong Xu,Yuyang Fan,Ming Li,Rui Xiao
A complex copper acid catalyst (SA-Cu/CuMgAlOx) was developed with boosted catalytic activity for the hydrodeoxygenation (HDO) of lignin-derived phenolics. Remarkably, the yields of total monomers and cyclohexanes from the HDO of lignin pyrolysis bio-oil were significantly improved after the catalyst modification with salicylic acid, which increased by 17 and 40%, respectively, at 300 °C for 8 h. The catalyst characterizations revealed that acidic oxygen-containing functional groups (−OH and −COOH) were introduced onto the catalyst surface without corrosion to the metallic framework. The acidic groups contributed to the formation of surface Brønsted acid sites, which participated in the hydrogenolysis and dehydroxylation reactions of the phenolics in bio-oil. The catalyst was deactivated after four cycles of bio-oil HDO and could be recovered after the removal of carbon deposits and the reactivation of Cu species. The results offered appealing opportunities for tailoring more efficient copper-containing catalysts for the HDO of lignin-based phenolics.
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高影响因子
MOLECULES
·
2021
·Vol. 26
·期 1
·218
·
IF 4.412
Tong Luo,Chao Wang,Xingxiang Ji,Guihua Yang,Jiachuan Chen,Srinivas Janaswamy,Gaojin Lyu
Lignin nanomaterials have wide application prospects in the fields of cosmetics delivery, energy storage, and environmental governance. In this study, we developed a simple and sustainable synthesis approach to produce uniform lignin nanoparticles (LNPs) by dissolving industrial lignin in deep eutectic solvents (DESs) followed by a self-assembling process. LNPs with high yield could be obtained through nanoprecipitation. The LNPs were characterized by dynamic light scattering (DLS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC). Distinct LNPs could be produced by changing the type of DES, lignin sources, pre-dropping lignin concentration, and the pH of the system. Their diameter is in the range of 20–200 nm and they show excellent dispersibility and superior long-term stability. The method of preparing LNPs from lignin–DES with water as an anti-solvent is simple, rapid, and environmentally friendly. The outcome aids to further the advancement of lignin-based nanotechnology.Keywords:lignin;nanoparticles;deep eutectic solvents;nanoprecipitation;size-controlled
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高影响因子
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