CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yiwen Zhang,Bo Yuan,Yuqing Zhang,Qiping Cao,Chao Yang,Yao Li,Jinghui Zhou
Trees are made of cellulose, hemicellulose and lignin linked by covalent bonds and supramolecular interactions. Among them, the lignin with three-dimensional structure plays a role in supporting the structure of the tree. Inspired by the nature of the tree, we have designed and synthesized a novel lignin/poly(ionic liquids) composite hydrogel dressing with excellent mechanical strength, self-healing properties, bactericidal activity, and antioxidant activity. This self-healing hydrogel dressing is obtained by the supramolecular interactions between the lignin/poly(ionic liquids) compounds. The introduction of lignin can effectively improve the mechanical properties of the hydrogel dressing. And the bactericidal poly (ionic liquid) modified on the lignin surface through covalent bonds endows this hydrogel dressing good antibacterial activity and self-healing properties. Wound healing model of rats and histomorphological evaluation results suggest that this hydrogel dressing promotes wound healing. Furthermore, the hydrogel dressing still maintains its excellent performances after simple high-temperature disinfection, and can be reused for many times.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Riyang Shu,Rongxuan Li,Yong Liu,Chao Wang,Peng-Fei Liu,Ying Chen
The synergistic effect of two metal species in bimetallic catalysts can promote the catalytic performances significantly, and the enhanced adsorption properties by the interaction between two metal species play an important role. In this study, we investigated the hydrodeoxygenation (HDO) performance of a bimetallic RuCo/SiO 2 -ZrO 2 catalyst, paying close attention to its adsorption properties based on the experimental and modeling study. RuCo catalyst presented a strong interaction between two metal species and electrons transfer from Ru to Co, which led to a higher spin-up d -band center value of surface atoms and thereby a different adsorption property from the monometallic catalysts. The good adsorption of hydrogen and substrate in RuCo catalyst played a crucial role on triggering the occurrence of HDO reaction for a better performance, which was also confirmed by the DFT calculation. This catalyst performed well on the HDO of guaiacol, other phenolic compounds and raw lignin-oil.
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高影响因子
Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 14
·3744-3754
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IF 6.367
Wangda Qu,Zizhu Zhao,Jie Wang,Fengying Dong,Hui Xu,Xinzhi Sun,Hong Jin
A facile and additive-free approach was developed to synthesize pure lignin-derived porous carbon for highly flexible supercapacitor electrodes. Lignin was simply melted on a carbon cloth, and then subjected to direct laser writing (DLW). It was found that lignin was transformed into 3D porous graphene while bonding on the carbon cloth. The fabricated materials (LCE) under different laser powers were all confirmed as having a sharp (002) peak with small d002 spacing from the XRD profile, and a high IG/ID ratio from Raman spectra. The LCEs showed promising capacitive behaviors in electrochemical testing. The best LCE (i.e., LCE40) possesses a CA of 786 mF cm−2, and it was further characterized by XPS and HRTEM to determine its compositional and structural information. Moreover, LCE40 had super flexibility attributed to carbon cloth as the substrate. The CA of the LCE after bending remained at 93–97% under different current densities. When assembled into symmetric solid-state supercapacitors, the LCE40-based device showed an areal capacitance of 148.6 mF cm−2, which is much superior to all other reported laser-induced lignin-derived carbon. This one-step process is innovative and simpler than any other porous carbon fabrication and provides a method for fabricating lignin-derived flexible supercapacitors.
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Junxian Xie,Junjun Chen,Zheng Cheng,Shiyun Zhu,Jun Xu
This study investigated the process intensification strategies for the pretreatment of Radiata Pine with the green deep eutectic solvent (DES) system composed of benzyltrimethylammonium chloride/formic acid (BTMAC/FA). The results showed that DES pretreatment drastically improved the delignification and hemicelluloses-removal capacity. The conducted process acceptably remained most of the cellulose in pretreated biomass (88.3%–91.8%). Benefiting from the overcoming of recalcitrance, the enzymatic digestibility of pretreated residues reached 92.4%. The efficient conversion was mainly ascribed to the lignin and hemicelluloses co-extraction. Meanwhile, the lignin yield and enzymatic saccharification was still largely maintained after five reuses. Further structural characteristics of lignin nanoparticles revealed that the lignin possessed high purity (95.19–97.51%), medium molecular weight (9600 to 6495 g/mol), and low polydispersity (ca 2.0), which was attributed to cleavage of ether bonds in lignin as well as linkages between lignin and hemicelluloses. Overall, this study illustrated that DES pretreatment was promising to achieve an efficient fractionation of woody biomass into fermentable glucose and high-quality lignin.
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PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 46
·期 2
·1469-1485
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IF 2.064
Yu Xin,Peng Lincai,Pu Qiuyu,Tao Ruili,Gao Xueying,He Liang,Zhang Junhua
The preparation and application of biorenewable carbon-based catalyst are attracting increasingly attention in the field of green and sustainable chemistry. Here, a facile and low-cost lignosulfonate-based carbonaceous solid acid (LSS) was availably prepared via directly sulfonating lignosulfonate that was from sulfite pulping industry, and used to catalyze biomass-derived furfuryl alcohol to yield versatile butyl levulinate. The fabrication and properties of LSS were highly sensitive to the sulfonation conditions (i.e., lignosulfonate-to-H 2 SO 4 ratio and temperature). The physicochemical properties of the as-prepared LSS were well characterized using BET surface area, acid–base titration, SEM, XRD, FT-IR, XPS, and TGA techniques. The LSS contained –SO 3 H, –COOH and phenolic –OH groups and was ideal to perform the reaction of furfuryl alcohol with n-butanol to obtain butyl levulinate in yield higher than 95% at 110 °C for 8 h with catalyst dosage of 15 g/L. Meanwhile, the catalyst deactivated increasingly with a recycle number that was attributed to the adsorption of formed polymeric by-products on the active catalyst sites, and the slightly deactivated catalyst after plain sulfonation treatment was found to remain active with an almost unchanged product yield in consecutive cycles. This work highlights an economic, eco-friendly, sustainable and promising protocol for catalytic upgrading of bio-based compounds.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2019
·
IF 3.571
Mingsong Zhou,Dongping Wang,Ruifen Peng,Dongjie Yang,Xueqing Qiu,Yong Qian
4-Amion-2,2,6,6-tetramethylpiperidine (Temp) was grafted into sodium lignosulfonate (SL) to obtain hindered amine-modified lignosulfonate (SL–Temp). Then, the polymer surfactant (SL–Temp–CTAB) was prepared using cetyltrimethylammonium bromide (CTAB) and SL–Temp. Obtained SL–Temp–CTAB was used as an emulsifier to prepare a green emulsifiable concentrate (EC) of avermectin (AVM), which shows good emulsifying property and storage stability. The prepared AVM green EC can form AVM-loaded microspheres with nanometer particle size distribution after emulsification in water. After ultraviolet irradiation for 70 h, the AVM retention rate of the green EC prepared using SL–Temp–CTAB was 75.8%, which is much higher than that of commercial EC (0.4%) and the green EC prepared using unmodified SL (31.4%). Moreover, the AVM green EC prepared using SL–Temp–CTAB has slow-release performance, and the release equilibrium time is 5.3 times the commercial EC. Therefore, the newly prepared AVM green EC using a lignin-based functional emulsifier shows good antiphotolysis and slow-release performance compared to the traditional EC.
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PubMed
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 5
·1141-1151
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IF 9.405
Cheng Cai,Yu Bao,Xuejuan Zhan,Xuliang Lin,Hongming Lou,Yuxia Pang,Yong Qian,Xueqing Qiu
The conversion of lignocelluloses into fermentable sugars by enzymatic hydrolysis is a key step in biorefining. However, there are still some bottleneck problems such as low hydrolysis efficiency, high cost of cellulase and low utilization of lignin. In this work, the nonionic surfactant monomethoxy polyethylene glycol (MPEG) was grafted on enzymatic hydrolysis lignin (EHL) to obtain a pH-responsive polymer (EHL-MPEG). EHL-MPEG could achieve rapid dissolution–precipitation conversion by the ionization and protonation of carboxyl groups. By adjusting the grafting amount of MPEG, EHL-MPEG could not only enhance the enzymatic hydrolysis of lignocelluloses, but also efficiently recover cellulase after hydrolysis. Adding 3 g L−1 EHL-MPEG40 (the mass ratio of MPEG to EHL was 40%) could increase the glucose yield of corncob residue (CCR) and pretreated eucalyptus from 79.4% and 48.3% to 92.5% and 89.5%, respectively, which was comparable to the effect of the nonionic surfactant PEG4600. By simply adjusting the pH of solutions, more than 85% of cellulase proteins could be recovered by EHL-MPEG40 with almost complete recovery of β-glycosidase, exoglucanase V and xylanase. Compared with a pH-responsive lignin amphoteric surfactant (pH-LAS) obtained by grafting ionic groups on lignin, EHL-MPEG40 had a more sensitive pH response and a stronger cellulase recovery ability. In the enzymatic hydrolysis of CCR, a pH-LAS could save about 50% of cellulase, while EHL-MPEG40 could save more than 60% of cellulase. Furthermore, approximately 96% of EHL-MPEG40 could be reused. This new method can not only evade the process of immobilization, but also avoid the activity loss and component change of cellulase through immobilization. Using recyclable EHL-MPEG to improve glucose yield and recover cellulase during lignocellulosic hydrolysis is of great significance for improving the enzymatic saccharification process, reducing the cost of cellulase and realizing comprehensive utilization of lignocelluloses.
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高影响因子
FUEL
·
2019
·
IF 5.128
Xiangping Li,Jianguang Zhang,Bin Liu,Juping Liu,Chuanbin Wang,Guanyi Chen
Non-noble metal(s)-based mesoporous catalysts are one of the promising catalysts for aqueous phase hydrodeoxygenation of lignin-derived phenols to produce hydrocarbons. In this paper, Ni/Al-SBA-15 was prepared through incipient wetness impregnation method and the performance of eugenol hydrodeoxygenation over Ni/Al-SBA-15 was studied. The effect of incipient wetness impregnant on the performance of eugenol hydrodeoxygenation over Ni/Al-SBA-15 was investigated. The materials were characterized by XRD, N 2 -sorption, TEM, FTIR, Py-FTIR, XRF and ICP-MS. In comparison with the traditional incipient wetness impregnation using water as solvent, the activity of Ni/Al-SBA-15 was significantly improved by using ethanol as solvent during the process of incipient wetness impregnation. For Ni/Al-SBA-15, the quantity of total acid was decreased after loading nickel species which was mainly due to the decrease of Lewis acid sites. The strength of Lewis acid in Ni/Al-SBA-15 prepare with ethanol as impregant was enhanced. The yields of propyl cyclohexane and propylbenzene from aqueous phase hydrodeoxygeation of eugenol over Ni/Al-SBA-15-E were increased. The super catalytic behavior of Ni/Al-SBA-15-E was attributed to the synergistic effect between the stronger Lewis acid sites and the intact framework structure of Ni/Al-SBA-15-E.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Fuhang Mai,Zhe Wen,Yunfei Bai,Zewei Ma,Kai Cui,Kai Wu,Fei Yan,Hong Chen,Yongdan Li
A WO3/γ-Al2O3 catalyst prepared by an incipient-wetness impregnation method is employed in the selective conversion of enzymatic hydrolysis lignin (EHL) into various alkylphenols in supercritical ethanol. In the reaction, EHL is completely dissolved and converted into aliphatic and aromatic compounds with a total yield of 363.4 mg/g lignin at 320 °C for 8 h. The yield of aromatic compounds is 315.8 mg/g lignin, accounting for 86.9% of the total yield of the products, and the overall selectivity of alkylphenols reaches 67.5%. Compared to WO3 and H2WO4, the WO3/γ-Al2O3 shows a higher activity for the conversion of EHL in supercritical ethanol. Besides, ethanol is found to be the most effective solvent for the depolymerization of EHL with the WO3/γ-Al2O3 catalyst. The WO3/γ-Al2O3 keeps the high catalytic activity in three reuses.
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高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Bingxing Jiang,Jun Hu,Yiheng Qiao,Xiaoxiang Jiang,Ping Lu
Performance of Ni–Pd bimetallic catalysts on depolymerization of lignin into monomeric phenols was investigated using isoproponal as an in situ hydrogen source. The performance of catalysts and the effects of temperature and starting lignins were extensively examined. Ni50Pd50/SBA-15 exhibited the best performance in the depolymerization of cellulolytic enzyme corn stalk lignin, affording the highest total monophenols yield of 8.14 wt % which was 1.96 times that of Ni/SBA-15 and 1.44 times that of Pd/SBA-15. For the depolymerization of acid-extracted birch lignin, 18.52 wt % monophenols were obtained over Ni50Pd50/SBA-15 at 245 °C for 8 h, and 4-propylsyringol had 8.89 wt % yield with 47.97% selectivity. The physicochemical characteristics of the catalysts were elucidated with ascanning electron microscopy, high-resolution transmission electron microscopy, nitrogen adsorption/desorption, X-ray diffraction, and X-ray photoelectron spectroscopy. The bimetallic catalyst had the characteristics of narrow distribution of metal particles with a small size, well-retained hexagonal pore structure of SBA-15, higher dispersion of Pd, and more Pd0 and Ni0 as compared with monometallic catalysts. The properties of the bimetallic catalyst provide more contact opportunities between the abundant active centers and lignin fragments, and therefore significantly promote the hydrogenolysis process to produce monomeric phenols.
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高影响因子
MOLECULES
·
2019
·Vol. 24
·期 9
·1834
·
IF 3.06
Feifei Wu,Xin Jia,Lijun Yin,Yongqiang Cheng,Yuxin Miao,Xiuqing Zhang
Lentinus edodes, whose polysaccharides possess diverse bioactivities, commonly grows on hardwood sawdust composed of hemicellulose, lignin and cellulose. In this study the effect of hemicellulose and lignin on the growth of mycelia, as well as the physicochemical properties of polysaccharides fromL. edodesmycelia (LEPs) were investigated. The antioxidant properties of LEPs were evaluated through radical scavenging assays in vitro and through theCaenorhabditis elegansmodel in vivo. The results showed that hemicellulose at a concentration of 4% increased the yield of the mycelia biomass to twice that of the control group. Meanwhile, when cultured with 4.0% hemicellulose, the polysaccharide content of the mycelia was raised by 112.2%. In addition, the appropriate concentration of lignin could stimulate mycelia growth and polysaccharide biosynthesis inL. edodes. Monosaccharide composition analysis showed that a higher content of xylose was found when mycelia were cultured with higher concentrations of hemicellulose. The molecular structure, including the molecular weight distribution and configuration type, was affected by hemicellulose and lignin. Antioxidant assays indicated that LEPs supplemented with hemicellulose and/or lignin possessed higher radical scavenging abilities in vitro and exhibited a thermal resistance effect onC. elegans, implying that the antioxidant effect is potent in vivo. In summary, the addition of hemicellulose and lignin improved the biosynthesis and bioactivity of LEPs.Keywords:Lentinus edodes;polysaccharide;hemicellulose;lignin;antioxidant activity;Caenorhabditis elegans
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PubMed
高影响因子
Molecular Catalysis
·
2018
·
IF 0
Jiang Li,Hui Sun,Jia-xing Liu,Jun-jie Zhang,Zhen-xing Li,Yao Fu
Lignin has recently attracted much attention as a promising resource to produce fuels and aromatic chemicals. The selective cleavage of C O bond while preserving the aromatic nature has become one of the major challenges in the catalytic valorization of lignin to aromatic chemicals. In this work, we report that the selective reductive cleavage of C O bond in lignin model compounds can be successfully achieved through heterogeneous iron catalysis. The hydrogenolysis of α-O-4 model linkage shows that the iron catalyst prepared by the simultaneous pyrolysis of iron acetate and 1,10-phenanthroline on activated carbon at 800 °C is the most active iron catalyst, affording phenol and toluene with yields of 95% and 90%, respectively. This aromatics selectivity is found to be much higher than that obtained over noble metal catalysts. The presence of N⋯Fe species as the active center of heterogeneous iron catalyst was confirmed by various technologies especially XPS and H 2 -TPR. For the β-O-4 model linkage, the vicinal OH group was essential for the iron-catalyzed hydrogenolysis of ether linkage. The oxidation of the α-carbon in the β-O-4 model compounds can significantly decrease the bond dissociation energy of ether linkage, giving depolymerization products in moderate to excellent yields.
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危险品化学品经营许可证（带存储）