BIOMACROMOLECULES
·
2022
·
IF 6.978
Xuhai Zhu,Cong Zhang,Haixia Ma,Fang Lu
The hydrogen bond (H-bond) is essential to stabilizing the three-dimensional biological structure such as protein, cellulose, and lignin, which are integral parts of animal and plant cells; thus, stereo-recognition of the H-bond is extremely attractive. Herein, a methodology combining the variable-temperature 1H NMR technique with the density functional theory was established to recognize the underlying H-bonding patterns in lignin diastereomers. This method successfully classified the intramolecular and intermolecular H-bonds with slope values varying between 50.2–201.5 and 221.9–655.4, respectively, from the natural logarithm of the hydroxyl proton chemical shift versus the inverse of the temperature plot. Moreover, this slope was found to be correlated with the interaction distance between the H-bond donor and acceptor. Finally, it was proposed that the stereo-preferential formation of the β-O-4 structure (erythro vs threo form) during lignin biomimetic synthesis was probably influenced by their intramolecular H-bonding patterns, thus making it easier to reach thermodynamic equilibrium.
研究领域:
生物化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Haifeng Jiang,Haipeng Liu,Baolin Liu,Yu Zhang,Shu Li,Jie Chen
This work studied the effect of cellulose–lignin interactions under potassium formate (HCOOK) and nickel formate (Ni(HCOO)2) on behavior and product distributions. The results indicated that the presence of HCOOK affected the whole thermal decomposition process, while the effect of Ni(HCOO)2 was mainly manifested before 339 °C. The interaction under the action of HCOOK favored the generation of carbonyl compounds, and the catalytic pyrolysis with Ni(HCOO)2 was better for formating phenols. The high peak intensities of CO and CH4 were achieved by adding nickel formate and potassium formate, respectively. It was obviously different from noncatalytic pyrolysis. The evolution of a char structure further revealed that different formate salts had different effects on the interactions. The statistical method according to the distribution of the liquid component confirmed that HCOOK had the strongest effect for reducing the cellulose–lignin interactions.
研究领域:
生物质能
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Runzhen Lai,Jun Hu,Yahui Sun,Ping Lu
Activated carbons (AC) were prepared from the three major components (cellulose, xylan , and lignin) of lignocellulosic biomass by H 3 PO 4 activation. Physicochemical characterizations reveal that as compared with AC from lignin (AC-L), AC from carbohydrates, especially AC from xylan (AC-X), have higher-developed porous structure, more disordered carbon, and more active O-containing and P-containing functional groups. The adsorption of methylene blue (MB) on all ACs followed Langmuir isotherm and pseudo-second-order kinetic models . Primarily due to its superior porosity, AC-X possessed the highest adsorption capacity for MB of 666 mg/g. AC from cellulose (AC-C) and AC-L followed with the adsorption capacities of 498 mg/g and 395 mg/g. The adsorption of MB was endothermic and AC-X had the highest feasibility and spontaneity. AC-X also exhibited superior adsorption capacities for the adsorption of typical heavy metals, although the superiority is much weaker as compared with that for MB. This research suggests the positive impact of carbohydrates, especially hemicellulose , in the precursors of the ACs on their adsorption performances.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Sijia Chen,Hao Cheng,Shubin Wu
In this paper, kraft lignin (KL) was fractionated by organic solvent method, and different lignin fractions were characterized by Gel permeation chromatography (GPC) and 1 H– 13 C HSQC NMR. The active functional groups content was analyzed by 31 P NMR and headspace gas chromatography (HS-GC). The results showed that fractionation could efficiently separate different molecular weight lignin fractions and the linkage bonds of lignin fractions F1 to F3 changed as follows: non-condensed linkages ( β -O-4) and condensed linkages ( β -5 and β - β ) both decreased. Moreover, some active functional groups such as phenolic hydroxyl groups and methoxy groups increased by fractionation. The thermochemical properties and volatiles formation rule of fractionized kraft lignin during pyrolysis were studied by thermogravimetric (TG), kinetics analysis, in situ Fourier-transform infrared spectroscopy (FT-IR) and U-type tube closed system pyrolysis experiment. The result showed that low-molecule lignin fractions were easier to depolymerize than that with high-molecule. Low-molecule lignin fractions had better selectivity of S-type monomer products while high-molecule fractions had better selectivity of G-type monomer products, and pyrolysis conducted at a relatively higher temperature was beneficial to the generation of G-type monomer products.
研究领域:
生物质能
·
林产化学工程
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 14
·7911-7927
·
IF 4.21
Li Mingfu,Yi Liu,Bin Luo,Zhang Qingtong,Song Junlong,Jiang Hongrui,Chen Changzhou,Wang Shuangfei,Min Douyong
Lignin, as a main factor inhibiting the enzymatic hydrolysis of lignocellulose, was investigated by comparing lignin isolated from untreated and pretreated lignocellulose to elucidate the differences in the enzyme adsorption ability. The nonproductive adsorption of cellulase on lignin was investigated by using a quartz crystal microbalance with dissipation. The results indicated that more cellulase adsorbed on the lignin isolated from autohydrolysis and green liquor-pretreated lignocellulose than on protolignin. Higher temperature and enzyme concentration increased the initial adsorption rate and the amount of enzyme adsorbed on lignin. A dynamic equation for enzyme adsorption on lignin was established. The adsorption of enzymes on lignin increased as the content of phenolic hydroxyl groups, and β-β and β-5 linkages in the lignin increased, attributed to enhanced hydrogen bonding and hydrophobic interaction. Consequently, inhibition of the enzymatic hydrolysis of cellulose was promoted by a higher phenolic hydroxyl group, β-β, and β-5 content. The adsorption of the enzyme components on lignin followed the order: β-glucosidase > xylanase > endo -glucanase > cellobiohydrolase, as revealed by polyacrylamide gel electrophoresis analysis. Electrostatic interaction increased the adsorption of β-glucosidase and xylanase on lignin, while synergistic hydrophobic interaction and hydrogen bonding increased the adsorption of endo -glucanase and cellobiohydrolase on lignin. The results indicate that the adsorption of enzymes on lignin is affected by the structure of lignin and the composition of the enzymes. The findings of the current study provide fundamental knowledge for improving the enzymatic conversion of lignocellulose.
研究领域:
生物化学
·
可再生资源工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Tianyu Ren,Shengping You,Muyuan Zhang,Yuefei Wang,Wei Qi,Rongxin Su,Zhimin He
Herein, the lignin-to-fuel conversion process was studied using real lignin as feedstock. Unlike model compounds, real lignin poisons the catalyst, causing rapid deactivation. The problem of catalyst deactivation was analyzed in detail for improving the conversion efficiency. We found that heavy carbonaceous deposits on the inner surface of the catalyst were responsible for the fast deactivation encountered in the conventional one-step reaction process. Moreover, the ester structures in lignin, which have previously been neglected in research, were confirmed to considerably worsen catalyst deactivation because they induce easier polymerization and hinder lignin conversion. Based on these points, we developed a three-step method that eliminates serious catalyst deactivation in the lignin-to-fuel conversion process, involving depolymerization of lignin, extraction of lignin monomers and hydrodeoxygenation of lignin monomers. The fuel production was 8.1–17.6-times more efficient using this three-step method than using the one-step batch reaction.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 22
·7955
·
IF 4.927
Hongzhi Ma,Penglu Fu,Jihua Zhao,Xingxing Lin,Wenyu Wu,Ziqiang Yu,Changlei Xia,Qunhui Wang,Ming Gao,Jun Zhou
In order to increase the fractionation efficiency of the wheat straw, a deep eutectic solvent (DES) system consisting of chlorine/lactic acid was used in this study for wheat straw pretreatment. The outcomes exhibited that DES pretreatment significantly enhanced the capability to extract lignin, retain cellulose, and remove hemicellulose. The best condition for the pretreatment of wheat straw was 150 °C for 6 h. The process retained most cellulose in the pretreated biomass (49.94–73.60%), and the enzymatic digestibility of the pretreatment residue reached 89.98%. Further characterization of lignin showed that the high yield (81.54%) and the high purity (91.33%) resulted from the ether bond cleavage in lignin and the connection between hemicellulose and lignin. As for application, the enzymatic hydrolysis of the best condition reached 89.98%, and the lignin also had suitable stability. The investigation exhibited that DES pretreatment has the potential to realize an efficient fractionation of lignocellulosic biomass into high-applicability cellulose and lignin of high-quality.
研究领域:
生物化学
·
可再生能源
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 23
·14863
·
IF 6.208
Huiyang Bian,Xuan Shu,Wenhao Su,Dan Luo,Maolin Dong,Xiuyu Liu,Xingxiang Ji,Hongqi Dai
The exploration of functional films using sustainable cellulose-based materials to replace plastics has been of much interest. In this work, two kinds of lignin nanoparticles (LNPs) were mixed with cellulose nanofibrils (CNFs) for the fabrication of composite films with biodegradable, flexible and ultraviolet blocking performances. LNPs isolated fromp-toluenesulfonic acid hydrolysis was easily recondensed and deposited on the surface of composite film, resulting in a more uneven surface; however, the composite film consisting of CNFs and LNPs isolated from maleic acid hydrolysis exhibited a homogeneous surface. Compared to pure CNF film, the composite CNF/LNP films exhibited higher physical properties (tensile strength of 164 MPa and Young’s modulus of 8.0 GPa), a higher maximal weight loss temperature of 310 °C, and a perfect UVB blocking performance of 95.2%. Meanwhile, the composite film had a lower environmental impact as it could be rapidly biodegraded in soil and manmade seawater. Overall, our results open new avenues for the utilization of lignin nanoparticles in biopolymer composites to produce functional and biodegradable film as a promising alternative to petrochemical plastics.
研究领域:
材料科学
·
环境科学
·
林业工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Wei Fang,Sen Yang,Tong-Qi Yuan,Adam Charlton,Run-Cang Sun
Anionic, cationic, and nonionic surfactants with varying concentrations (0.2–1.2%) were introduced to neutralize beads on lignin nanofibers by decreasing the surface tension of spinning dopes. The surfactants used in this work were sodium dodecyl sulfate (SDS), N,N,N-trimethyl-1-dodecanaminium bromide (DTAB), and Triton X-100 (TX-100). The effects of viscosity, rheological properties, surface tension, and conductivity of the solutions on the morphology and physicochemical performances of fibers were investigated. As expected, the presence of certain amounts of surfactants eliminated the beads and resulted in the formation of smooth and bead-free fibers with small diameters. Furthermore, the gravimetric capacitance of the carbon mat with 1% SDS was slightly improved from 66.3 to 80.7 F g–1. The results suggested that the surfactants benefit from the electrospinning of lignin and allow for the control over nanofiber morphology without compromising their performance as supercapacitor electrodes.
研究领域:
高分子材料
·
纳米纤维技术
·
能源材料
·
电化学
·
表面科学
·
生物基材料
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2018
·Vol. 13
·期 1
·59-69
·
IF 2.643
Yang Dongjie,Wang Shengyu,Zhong Ruisheng,Liu Weifeng,Qiu Xueqing
A simple method using a water soluble lignin quaternary ammonium salt (LQAS) and TiO 2 has been developed for the preparation of lignin/TiO 2 nanocomposites in an aqueous medium under mild conditions. The LQAS/TiO 2 nanocomposites contain well-dispersed small particles with excellent ultraviolet (UV) shielding abilities and good compatibilities with waterborne polyurethane (WPU). When the LQAS/TiO 2 nanocomposites were blended with WPU, the UV absorbance and the tensile ductility of the WPU increased significantly. The composite WPU hybrid film containing 6 wt-% LQAS/TiO 2 nanocomposite had the highest visible light transmittance and had excellent ultraviolet aging properties. After 192 h of UV light irradiation, the tensile strength of the composite film was above 8 MPa and the elongation at break was 800%. This work highlights new possibilities for the utilization of alkali lignin.
研究领域:
高分子材料
·
纳米复合材料
·
表面涂层技术
·
紫外线防护
·
绿色化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Jiawen Gao,Hanxiao Zhang,Qiannan Zhang,Siqi Li,Bin Luo,Jiulong Sha,Hongbin Liu
Harvesting energy from water flow using fiber-shaped fluidic nanogenerators (FFNGs) based on liquid-solid contact electrification has practical significance. Challenges remain in the fabrication of conformal FFNGs with favorable durability and a large strain range. Herein, a robust, flexible, and stretchable FFNG is fabricated using carbonized lignin and thermoplastic polyurethane via wet-spun approach. A maximum output direct current voltage of 420 mV is generated when the saline solution flows over a 6-cm-long FFNG. The output voltage of the FFNG shows excellent stability and repeatability in multiple cyclic tensile tests . Furthermore, the excellent mechanical properties and high stretchability of FFNG enable it to be woven into fabric, proving its tremendous potential for use in conformal electronics. The robust FFNG can also act as a self-powered wave sensor, which provides basic information on the wave conditions.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Ying Yuan,Zhiqiang Tang,Zhihao Yang,Xiluan Wang
Functional hydrogel sensors have shown explosive growth in the health and medical fields. However, the uniform adhesion and the complicated polymerization process of hydrogels seriously hinder their further development. Herein, inspired by the layered structure of human skin, we prepare a Janus gel using in-situ polymerization. Based on the lignin-Fe 3+ dual catalytic system, the rapid polymerization of the gel was achieved at room temperature. By tailoring the mass ratio of lignin and Fe 3+ in the precursor, the adhesion of the upper and bottom layers can be easily adjusted. In addition, hydrophobic association is introduced into the upper layer to improve the gel's mechanical properties. The obtained asymmetric bilayer gel has a significant difference in adhesion (7 times), and exhibits excellent mechanical properties in the elongation at break (1437 %) and the breaking strength (463.2 kPa). Moreover, the bilayer gel also has good freezing and UV resistance. We use the bilayer gel as a wearable strain sensor, which shows a wide strain detection range of 0–800 % (maximum gauge factor = 5.3). The proposed simple strategy avoids UV irradiation and heating processes, which provides a new idea for the rapid polymerization of multifunctional Janus hydrogels with adjustable performances.
研究领域:
材料科学
·
化学工程
·
生物医学工程
·
传感器与执行器
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）