Nanomaterials
·
2020
·Vol. 10
·期 3
·594
·
IF 4.324
Chenyan Guo,Haitong Ma,Qingtong Zhang,Mingfu Li,Hongrui Jiang,Changzhou Chen,Shuangfei Wang,Douyong Min
MnO2-deposited lignin-based carbon fiber (MnO2-LCF) mats are fabricated for supercapacitor applications. LCF mats are produced from alkali lignin via electrospinning followed by stabilization and carbonization. The carbonization process is carried out at 800, 900, and 1000 °C, and the corresponding mats are denoted as MnO2-LCF-800, MnO2-LCF-900, and MnO2-LCF-1000, respectively. The LCF mats are immersed in a KMnO4solution at room temperature for 72 h to obtain MnO2-LCF mats. The scanning electron microscopy and X-ray diffraction analysis confirm the deposition of MnO2on the LCFs. The Brunauer–Emmett–Teller analysis, X-ray spectroscopy, and Raman spectroscopy reveal that MnO2-LCF-800 mat possesses a large number of mesopores and Mn vacancies as compared to MnO2-LCF-900 mat and MnO2-LCF-1000 mat. Consequently, MnO2-LCF-800 mat possesses the best electrochemical properties with a specific capacitance of 131.28 F∙g−1, an energy density of 14.77 Wh∙kg−1, and a power density of 135.01 W∙kg−1at a specific current of 0.3 A∙g−1. Hence, MnO2-LCF-800 mat shows high potential to be used as a high-performance supercapacitor.Keywords:electrospinning;lignin;carbon fiber;mno2;supercapacitor
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Huan Wang,Yuanyuan Wang,Fangbao Fu,Yong Qian,Yonghao Xiao,Dongjie Yang,Xueqing Qiu
In this work, a novel lignin/titanium dioxide (QAL/TiO 2 ) hybrid composite with regular microstructure and synergistically enhanced UV absorption properties was synthesized by a simple hydrothermal method using lignin and butyl titanate. The prepared QAL/TiO 2 composite is hybrid structure in which lignin and TiO 2 is uniformly embedded, and has strong chemical bond bonding force. The QAL/TiO 2 hybrid composite particles were used for doping modification of waterborne polyurethane (WPU), which had good interfacial compatibility and dispersibility in WPU. The obtained WPU + QAL/TiO 2 film shows excellent UV shielding performance and great mechanical properties, the tensile strength and elongation at break are significantly improved compared with pure WPU film. And it also has excellent anti-UV aging property, that the mechanical performance basically remains unchanged after 96 h of high power ultraviolet irradiation. This work not only provides a kind of lignin/TiO 2 hybrid composite with neat structure, good dispersion and excellent optical properties, but also has great significance for the high-valued utilization of biomass resources.
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HOLZFORSCHUNG
·
2019
·Vol. 74
·期 5
·513-521
·
IF 2.579
Yijie Zhou,Yong Qian,Senyi Wu,Xiaowen Zhong,Jinhao Huang,Xueqing Qiu
Aiming to improve the poor miscibility between lignin and non-polar materials, alkali lignin (AL) was self-assembled into lignin reverse micelles (LRM) and blended with high-density polyethylene (HDPE) to fabricate composite films. The particle size of AL increased from 3.5 nm to 130 nm after forming LRM, showing a uniform spherical morphology. The water droplet contact angle increased from 54° to 89°. Optimal and rheological analysis revealed that composite films exhibited good transparency, ultraviolet (UV)-blocking performance and low viscoelasticity after adding the nano LRM. Under the optimal dosage of 5 wt% LRM, the composite film can screen 93% UV rays, and the apparent viscosities, complex viscosities, storage and loss modulus of the mixture were the lowest. Atomic force microscopy (AFM) was used to investigate the molecular interactions between lignin and HDPE. The average adhesion force between LRM and HDPE in dry air was 1.07 mN m −1 , while that between AL and HDPE was 0.77 mN m −1 . AFM experiments fundamentally demonstrated better compatibility between LRM and HDPE, which was beneficial for the improvement of UV-blocking, rheological properties, as well as their processability of LRM/HDPE films.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Kejing Wu,Chunyan Yang,Yingming Zhu,Junbo Wang,Xueting Wang,Changjun Liu,Yingying Liu,Houfang Lu,Bin Liang,Yongdan Li
Molybdenum carbide catalysts over activated carbon with different crystal phases were synthesized under controllable carburization atmospheres and temperatures for transfer hydrogenation of Kraft lignin in ethanol to aromatic monomers. Single α-MoC1–x and crystal transformation of α-MoC1–x to β-Mo2C are observed under a CH4/H2 mixture and H2 carburization atmospheres, respectively. The mixed crystal phases of α-MoC1–x and β-Mo2C with different crystallinities under a N2 carburization atmosphere exhibit higher activity with a maximum aromatic yield of 0.5163 g/g Kraft lignin when carburized at 700 °C. The dehydrogenation reaction and Kraft lignin hydrogenation are proposed to explain the synergistic effect of β-Mo2C, base, and α-MoC1–x for the base-promoted transfer hydrogenation process in ethanol, which is confirmed by in situ Fourier transform infrared analysis. This highly efficient process is suitable for the conversion of different lignin feedstock.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
·
IF 3.927
Zuguang Liu,Xiang Lu,Junkang Xie,Bo Feng,Qiaoning Han
In current work, lignin-based multi-arm star copolymer phenolated kraft lignin-graft-poly (2-methacryloyloxyethyl) trimethyl ammonium chloride (PKL-g-PDMC) was designed and synthesized as a new kind of cationic flocculant via Steglich esterification of PKL and subsequent RAFT polymerization with DMC, and its flocculation performance in the removal of kaolin particles from simulated wastewater was evaluated. The star PKL-g-PDMCs with varying graft density and arm length of PDMCs chains were characterized by 1 H NMR, 31 P NMR, GPC and TGA. The effects of graft density and arm length, PKL-g-PDMC dosage, suspension pH and settling time on flocculating performance were investigated by measuring residual turbidity of the settled suspension. The treatment was effective, as demonstrated by 96.4% efficiency of turbidity removal. Above all, the chemical structure of the copolymers, including graft density and the arm length, can be designable and tunable by simply changing feeding ratios of Steglich esterification and subsequent RAFT polymerization, and thus the best flocculation performance can be obtained. This work provides a blueprint for the design, synthesis and use of novel lignin-based multi-arm star copolymers for wastewater treatment with tunable properties.
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AMB Express
·
2018
·Vol. 8
·期 1
·1-16
·
IF 1.719
Duan Zihong,Shen Rui,Liu Binjie,Yao Mengwei,Jia Rong
Irpex lacteus F17 is well-known for its ability to degrade recalcitrant aromatic pollutants, which mainly results from the action of the manganese peroxidase (MnP) that it is able to produce. Recently, the genome sequencing and annotation of this strain provided comprehensive picture of the ligninolytic peroxidase gene family. In addition to revealing the presence of 13 MnPs, genes for five dye-decolorizing peroxidases (DyPs) were also discovered in the I. lacteus F17 genome, which are unrelated to the fungal class II peroxidases. In the present study, amino acid sequences of five DyPs and 13 MnPs, representing two different families of heme peroxidases, were analyzed. Of these, two enzymes, a DyP (Il-DyP4) and a MnP (Il-MnP6) were expressed respectively in Escherichia coli, and were characterized by comparing their molecular models, substrate specificities, and catalytic features. The results showed that Il-DyP4 possessed a higher catalytic efficiency for some representative substrates, and a stronger decolorizing ability to a wide range of synthetic dyes in acidic conditions. Based on electrochemical measurements, Il-DyP4 was found to have a high redox potential of 27 mV at pH 3.5, which was superior to that of Il-MnP6 (− 75 mV), thereby contributing to its ability to oxidize high redox potential substrates, such as veratryl alcohol and polymeric dye Poly R-478. The results highlighted the potential of Il-DyP4 for use in industrial and environmental applications.
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CELLULOSE
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2018
·Vol. 26
·期 3
·2075-2085
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IF 3.809
Li Yaping,Li Bo,Mo Wenxuan,Yang Wenjing,Wu Shubin
Abstract Recycled pulp can be used as a potential and sustainable resource for production of fermentable monosaccharides. In this work, the effects of residual lignin and thermal drying on ultrastructure, physical properties and further enzymatic digestibility of chemical pulps were investigated. The results showed that drying process (at 105 °C for 24 h) did not significantly change the functional groups but it resulted in increased cellulose crystallinity and fibril aggregation, pore shrinkage and decreased swelling ability of fibers. On the other hand, residual lignin (~ 3%) in unbleached pulp restrained partially the deterioration of those properties during drying, compared to bleached pulp (lignin content 0.3%). Compared with once-dried bleached pulp, the unbleached pulp after drying had a slightly higher proportion of amorphous region, higher average pore size and specific surface area, and lower hornification degree, which are favorable for enzymatic hydrolysis. Moreover, the fibrils may have wrapped the lignin when they aggregated, reducing the unfavorable adsorption of lignin to cellulase. Enzymolysis also showed that the once-dried unbleached pulp was much easier to digest, and yielded 66% glucose after 12-h hydrolysis, which was much higher than the yield (54%) of the once-dried bleached pulp and should have good prospects. Graphical abstract
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RSC Advances
·
2015
·Vol. 5
·期 121
·100030-100038
·
IF 3.84
Ruihua Li,Baoyu Gao,Shenglei Sun,Hui Wang,Yingxue Liu,Qinyan Yue,Yan Wang
To recycle papermaking sludge, a novel lignin-based flocculant with high cationic degree and molecular weight was introduced. The product, lignin–diallyl dimethyl ammonium chloride–acrylamide (LDA) was combined with polyferric chloride (PFC) to treat simulated humic acid (HA) solution. To identify its flocculation mechanisms, coagulation efficiencies and floc properties under different dosing methods and pH conditions were studied. Results showed that LDA was superior to polyacrylamide, poly diallyldimethylammonium chloride as well as lignin–acrylamide with regards to dissolved organic carbon (DOC) and turbidity removal efficiencies, which demonstrated its significant flocculating efficiency. Compared with single PFC, the addition of LDA enhanced the coagulation performance and floc properties, including floc size, growth rate and the recovery ability within the investigated pH range. The dosing sequence also had an effect on the coagulation mechanism and performance. When PFC was dosed first, negatively charged Fe(III) hydrolysates-colloids were neutralized and bridged by LDA. On the contrary, colloids–LDA complexes with slight negative charge were destabilized by the entrapment and sweeping effect of Fe(III) hydrolysates. As a result, coagulation efficiencies were in the following order: PFC dosed firstly (PFC + LDA) > LDA dosed firstly (LDA + PFC) > PFC. PFC + LDA achieved the maximum floc size and growth rate, whereas flocs with the most open structure was formed by LDA + PFC. Moreover, the effect of solution pH on coagulation behavior was noteworthy due to the variance of hydrolyzed Fe species. PFC was more sensitive to pH with regards to coagulation efficiencies and flocs structure. The variations caused by different pH values decreased after the addition of LDA. Regardless of the coagulant types, the optimal coagulation performance and floc characteristics were achieved under acidic conditions, especially at pH 6. Overall, LDA could introduce strong charge neutralization and adsorption bridging effect within a relatively wider pH range and offer a positive effect on coagulation behavior and flocs properties.
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RSC Advances
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2016
·Vol. 6
·期 96
·93894-93904
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IF 3.289
Jianming Pan,Jialu Luo,Jun Cao,Jinxing Liu,Wei Huang,Wenli Zhang,Lili Yang
Hydrophilic urea-formaldehyde macroporous foams (UFMF) were simply synthesized by templating oil-in-water Pickering high internal phase emulsions (HIPEs) solely stabilized by lignin particles. Morphology and structure of the UFMF can be easily tailored by varying the experimental compositions of Pickering HIPEs and polymerization time. Due to their porous matrix, hydrophilic surface, and high content of binding groups (such as hydroxyl groups and carbonyl groups), as-prepared UFMF was adopted for the removal of three phenolic compounds (PCs) from aqueous solution. The influences of pH, solution temperature, contact time, and initial concentration of 2,4,5-trichlorophenol (2,4,5-TCP), 2,4,6-trichlorophenol (2,4,6-TCP) and 4-nitrophenol (4-NP) on adsorption capacity and competitive adsorption of multi PCs were investigated via the batch mode experiments. The adsorption kinetics and adsorption isotherms fit well by a pseudo-second-order model and Langmuir model, respectively. The max adsorption capacity of 2,4,5-TCP, 2,4,6-TCP and 4-NP at 25 °C are 116.3 mg g−1, 78.74 mg g−1, 29.41 mg g−1, respectively, and their adsorption rate follows the order 2,4,5-TCP > 2,4,6-TCP > 4-NP. Moreover, the group type and position effects both influence the adsorption, and follow the order: 2,4,5-position substitution of chloride > 2,4,6-position substitution of chloride > 4-position substitution of nitro-group, showing that the substitution with the more groups has the higher adsorption affinity.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Pei-Ru Zhou,Xiao-Ping Zheng,Ya-Peng Du,Yu Chai,Yu-Cang Zhang,Yan-Zhen Zheng
In this study, polyethylene glycol 200 (PEG200) was employed as hydrogen bond acceptor, while organic acids served as hydrogen bond donors, to formulate poly-deep eutectic solvents (PDESs), which were utilized to pretreat tea stem. Specially, combining PEG200 and oxalic acid (OA) exhibited a notably high cellulose retention (82.03 %) and most efficient hemicellulose (97.02 %) and lignin removal (70.89 %). The removal of amorphous lignin enhanced the crystallinity of the residues and improved the conversion efficiency of cellulose into levulinic acid. Additionally, the structural alterations in lignin samples were analyzed in comparison to milled wood lignin (MWL). The PEG200-OA system facilitated the cleavage of β-O-4 and β-5 linkages and resulted in the degradation of S-type lignin, accompanied by increased condensation of G units. The resulting lignin displayed a reduced molecular weight (Mw of 1283 g/mol, Mn value 531 g/mol) and nanoscale particle size (D 50 212 nm). Furthermore, fluorescent lignin was synthesized through simple oxidation and was used to detect metal ions. Density functional theory (DFT) calculations supported that both PEG200 and OA played a significant role in lignin dissolution, with the weak interactions between DES and lignin primarily driven by hydrogen bonding (characterized as weak, closed-shell, and electrostatic) and van der Waals forces.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xiaoxue Zhao,Xin Xu,Zhe Ling,Caoxing Huang,Chenhuan Lai,Qiang Yong
Developing green pretreatment technologies that prioritize the selective separation of lignin is of significant importance for the industrialization of biorefining. This work employed H 2 SO 4 -catalyzed γ-valerolactone (GVL) pretreatment on masson pine sawdust (GAM) to investigate process conditions and the enzymatic hydrolysis performance of masson pine. The results indicated that the lignin removal rate was 87.2% under the optimal pretreatment conditions (150ºC, 75 mM H 2 SO 4 ). The synergistic effect of the H 2 SO 4 catalyst and GVL pretreatment resulted in an enzymatic hydrolysis yield for GAM (76.8%) nearly six times higher than that of other non-synergistic systems (5.7%∼13.0%). Furthermore, the enzymatic hydrolysis yield increased to 97.3% upon the addition of bovine serum albumin . Microscopic visualization was used to analyze the morphological changes of cells and the micro-distribution of lignin within GAM cell walls after pretreatment. Additionally, structural changes in the molecular weight , functional groups, and linkage contents of GAM lignin were analyzed. This research provides valuable insights for masson pine in producing fermentable monosaccharides and acquiring lignin with enhanced processing properties.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Keyu Lian,Shengdu Yang,Dianheng Lu,Wei Tang,Junhua Zhang
Substantial interest in producing thermosets and photoresponsive chemicals from bioresources is garnering, yet moderate performance drastically confines their applicability in electronic packaging material. Herein, several thermosetting epoxy building blocks from lignin-derived monomers (vanillyl alcohol and eugenol) were constructed, and a range of lignin-based enhanced photocurable resins were further developed using acrylic acid and tetrahydrophthalic anhydride as modifiers by an one-pot synthesis method. The comprehensive performance of lignin-based functionalized photocurable resins was systematically investigated, such as their photopolymerization behavior, thermal–mechanical properties, and electrical breakdown properties. As a result, the biobased thermosetting resin stemming from vanillyl alcohol monomers fulfilled fascinating heat resistance (Tg ≈ 103.9 °C) and tensile strength (28.89 ± 4.39 MPa). Additionally, inspired by a tunable chain-extending tactic, the toughness and electrical breakdown strength of the biobased photo-cross-linked films were further intensified by the insertion of flexible alkyl chain segments between cross-linked sites. As proof of concept, the formulated EAAT green ink, consisting of photocurable resin and inorganic, demonstrated a superior patterning ability after alkali development. The rationally designed lignin-derived photo-cross-linked network strengthening mechanism reported here offers an important and universal strategy for significantly enhancing the comprehensive properties of biobased photocurable materials.
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危险品化学品经营许可证（带存储）