FUEL
·
2022
·
IF 8.035
Tao Liu,Zhipeng Tian,Weijie Zhang,Bowen Luo,Libin Lei,Chao Wang,Jianping Liu,Riyang Shu,Ying Chen
Selective hydrodeoxygenation (HDO) of phenolic compounds derived from the pyrolysis lignin-oil to desired products is a promising route in the high-value utilization of biomass-derived products. Cyclohexanol, as one of the important chemical materials, is an intermediate of catalytic HDO of guaiacol. Controllable selective HDO is conducted to improve the cyclohexanol selectivity over RuFe bimetallic catalyst prepared by ethylene glycol reduction method in this work. 99.99% guaiacol conversion and 81.35% cyclohexanol selectivity are obtained over optimized 2Ru2.5Fe/Al 2 O 3 -EG catalyst, which is better than those over 2Ru/Al 2 O 3 -EG catalyst. The mild catalyst preparation method gives it a high dispersion and uniform distribution of Ru and Fe species on the support. Various characterizations have proved that the intimate contact between Ru and Fe 2 O 3 species contributes to the improvement of cyclohexanol selectivity. Partial blockage of Ru sites by Fe 2 O 3 species slightly reduces the hydrogen adsorption capacity while the addition of Fe helps enhancing the hydrogenolysis of C-OMe bond. The reciprocal effect facilitates the removal of methoxyl groups and hinders the dehydroxylation of cyclohexanol to cyclohexane. Besides, other phenolic compounds and pyrolysis lignin-oil as substrates also show good selective HDO reactivity to corresponding alkyl cyclohexanols, implying potential application in the transformation from lignin-oil to high-value products.
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高影响因子
ACS Omega
·
2023
·
IF 4.1
Yajie Zuo,Siying Zhu,Yi Liu,Jingjing Zhao,Shiyi Zhang,Chongmin Zhong
Efficient O-alkylation of phenols and carboxylic acids has essential applications in organic synthesis. A mild alkylation method for phenolic and carboxylic OH groups is developed using alkyl halides as alkylation reagents and tetrabutylammonium hydroxide as a base, and lignin monomers can be fully methylated in quantitative yields. Additionally, phenolic and carboxylic OH groups can be alkylated by different alkyl halides in one pot in different solvent systems.
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PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
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IF 5.9
Si Hong,Peng-Fei Wang,Ming-Zhao Xiao,Xiao-Jun Shen,Jia Liu,Xue-Fei Cao,Tong-Qi Yuan
Deep eutectic solvent (DES) pretreatment of lignocellulose is an appealing and green approach for efficient lignin extraction. However, the process of lignin regeneration and DES recovery was time-consuming and labor-intensive. Herein, without any separation and purification after the DES pretreatment of Eucalyptus , the lignin/DES mixture was firstly used to fabricate hierarchical porous carbon materials through DES-thermal carbonization (DTC) and activation. Results revealed that the DTC processing involved degradation, condensation, aromatization, and aggregation, which significantly improved the carbonization degree and thermostability of carbon materials. X-ray photoelectron spectroscopic results confirmed the introduction of nitrogen atom from the choline chloride/lactic acid DES into the fabricated carbon materials during the DTC processing. This phenomenon can generate extra pseudocapacitance and thus increase the specific capacitance of supercapacitors. The capacitance retention of the resultant porous carbon materials (AC-200–12) reached above 95% after 10,000 charge-discharge cycles, which was much superior to commercial activated carbon. This facile and sustainable methodology overcomes traditional complex and expensive methods for preparing carbon materials from hardwood, which show promising potential to be used as electrode materials in a supercapacitor.
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2023
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IF 5.7
Jing Zhao,Wenjie Zhang,Dekui Shen,Huiyan Zhang,Zhanghong Wang
Lignin-based porous carbon materials are estimated as promising CO 2 capture adsorbents with thanks to their charateristics as abundant distribution, low-cost preparation and high stability. In this work, a series of porous carbon materials were synthesized from the pulping waste (black liquor lignin) through chemical activation and template method . The morphological structure, porosity and surface chemical properties of the obtained porous carbon materials identified by SEM, XRD , Raman, BET and XPS were highly influenced by the synthesis methods . The porous carbon material prepared by KOH activation (C-BLL-KOH) possessed the most disorder carbon structure, along with the largest BET surface area up to 1336.5 m 2 /g and the highest microporosity accounting for 93.2% of the total pore volume, which is beneficial for capturing CO 2 . The sulfur-contained functional groups in chemically-activated carbon materials were dominated by oxidized sulfur species and oxygen element was mainly in the form of hydroxyl groups. CO 2 adsorption performance of these lignin-based porous carbon materials was carried out at different temperatures (0 °C, 25 °C and 50 °C) to investigate the effect of synthesis method. The most remarkable CO 2 capture capacity was achieved for C-BLL-KOH, which was up to 5.20 mmol/g at 0 °C, 3.60 mmol/g at 25 °C and 2.23 mmol/g at 50 °C at a CO 2 partial pressure of 100 kPa. This result suggested the KOH activation was an effective route to convert black liquor lignin to porous carbon materials as potential absorbents for CO 2 capture.
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高影响因子
Biotechnology for Biofuels and Bioproducts
·
2022
·Vol. 15
·期 1
·1-12
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IF 0
Hu Yueli,Zhang Chen,Zou Lihua,Zheng Zhaojuan,Ouyang Jia
Background The conversion of lignin-derived aromatic monomers into valuable chemicals has promising potential to improve the economic competitiveness of biomass biorefineries. Pinosylvin is an attractive pharmaceutical with multiple promising biological activities. Results Herein, Escherichia coli was engineered to convert the lignin-derived standard model monomer cinnamic acid into pinosylvin by introducing two novel enzymes from the wood plant: stilbene synthase from Pinus pinea (PpSTS) and 4-Coumarate-CoA ligase from Populus trichocarpa (Ptr4CL4) . The expression of Ptr4CL4 drastically improved the production of pinosylvin (42.5 ± 1.1 mg/L), achieving values 15.7-fold higher than that of Ptr4CL5 (another 4-Coumarate-CoA ligase from Populus trichocarpa ) in the absence of cerulenin. By adjusting the expression strategy, the optimized engineered strain produced pinosylvin at 153.7 ± 2.2 mg/L with an extremely high yield of 1.20 ± 0.02 mg/mg cinnamic acid in the presence of cerulenin, which is 83.9% ± 1.17 of the theoretical yield. This is the highest reported pinosylvin yield directly from cinnamic acid to date. Conclusion Our work highlights the feasibility of microbial production of pinosylvin from cinnamic acid and paves the way for converting lignin-related aromatics to valuable chemicals.
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PubMed
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Linghong Yin,Pengyu Hu,Chen Liang,Jie Wang,Ming Li,Wangda Qu
Lignin is a renewable biomacromolecule that can be used as precursors for carbon materials. In this work, highly flexible lignin-based carbon nanofibers with abundant ultra-micropores are constructed via electrospinning, oxidative stabilization and carbonization. The results indicate that replacing PAN with 80 % lignin is feasible in regulating ultra-micropores. The synthesized L4P1-CNFs possess many attractive properties (e.g., pore size distribution , electrochemical and deionization property) compared with that produced from other non-renewable precursors or more-complexed processes. It shows excellent electrochemical double-layer capacitance in 6 M KOH (233 to 162 F g −1 at 0.5 to 5 A g −1 ) and 1 M NaCl (158 to 82 F g −1 at 0.5 to 5 A g −1 ) electrolytes. Upon assembling into CDI cells, the average salt adsorption rate could reach 1.79 mg g −1 min −1 at 1.2 V and 3.32 mg g −1 min −1 at 2 V in 500 mg L −1 . Benefiting from the excellent flexibility, we innovatively stack four layers of L4P1-CNFs to improve the areal electrosorption capacity to 0.0817 mg cm −2 at 500 mg L −1 , significantly higher than that of traditional carbon-based electrodes. The good desalination property makes lignin-based carbon nanofibers ideal for practical, low-cost capacitive deionization applications.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Jianhua Huang,Haixu Wang,Weifeng Liu,Jinhao Huang,Dongjie Yang,Xueqing Qiu,Liang Zhao,Fengchao Hu,Yuexia Feng
Using cheap and green lignin as a partial substitute for petroleum-based polyols is highly attractive for sustainable development of polyurethane elastomers (LPUes). However, the traditional synthesis process of LPUes inevitably uses toxic solvents that are difficult to remove or carcinogenic. Here, we reported a solvent-free synthesis method to prepare lignin-containing polyurethane elastomers (SF-LPUes) with high strength, high toughness and high elasticity. Most of the hydroxyl groups of lignin reacted with isocyanates to form a strong chemical cross-linking network, while the unreacted ones formed a dynamic hydrogen bond network with polyurethane matrix, contributing to the in-situ formation of lignin nanoparticles to build a nano-micro phase separation structure. Consequently, a dual-crosslinking network structure was formed and endowed SF-LPUes with excellent mechanical properties. Especially, the SF-LPUes prepared from low molecular alkali lignin possessed a tensile strength as high as 38.2 MPa, a maximum elongation at break of 1108 %, and an elastic recovery ratio of up to 98.7 %. Moreover, SF-LPUes showed impressing reprocessing performance and aging resistance. This work provides an industrial application prospect for the synthesis of lignin-containing polyurethane elastomers via a solvent-free synthesis process.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Rabia Jalil Khan,Chun Yin Lau,Muhammad Usman Farid,Md Khairul Islam,Alicia Kyoungjin An,Jiang Yi,Shao-Yuan Leu
The application of renewable and functional group-enriched lignin has recently gained massive popularity in wastewater treatment applications. Herein, woody biomass-derived organosolv lignin nanoparticles (LNPs) with uniform colloidal spherical morphology and average particle size (⁓150 nm) were synthesized via a simple and facile anti-solvent nanoprecipitation technique and used for the fabrication of ultrafiltration nanocomposite membrane. Upon the addition of LNPs to polyether sulfone (PES) matrix, the LNPs-impregnated membrane exhibited a thinner surface layer that induced low resistance to water flow, high pore density (83.2 ± 0.9%) with uniformly distributed pores, wider and well-connected internal macrovoids with higher sub-layer porosity, and a higher negative surface charge (−29.8 mV). These structural features hence contributed to high stable permeation flux (92.3 L m −2 h −1 ) and higher removal efficiencies (> 95%) for treating cationic (methylene blue) and anionic (methylene orange) dyes over a wide range of environmentally relevant pH conditions . The electrostatic interactions between the charged membrane surface and dye species revealed the underlying mechanism for higher dye rejection through the PES-LNP membrane. Finally, the structural stability analysis confirmed the complete incorporation/immobilization of LNPs within the PES matrix, making it ready for real-world applications in wastewater treatment.
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高影响因子
BIOMASS & BIOENERGY
·
2023
·
IF 6
Xiaoqi Lin,Kaisen Jiang,Xuebin Liu,Hongyan Bi,Tianya Li,Dezhi Han,Qinqin Zhang
The chemical transformation of lignocellulosic biomass into platform chemicals is one of the most efficient utilization methods for agricultural wastes . In this work, a one-pot strategy for the conversion of corn stalk to ethyl levulinate and further extraction of valorizable lignin catalyzed by ILs was proposed. With the optimized catalyst of [C 3 H 6 SO 3 Hmim]HSO 4 , corn stalk of 92.45% was transformed into ethyl levulinate with a favorable yield of 24.72% at 200 °C for 90 min. Furthermore, the lignin extraction was substantially influenced by co-solution system. A high lignin yield of 79.94% was achieved with ethanol content of 75% (v/v) in the ethanol-water system. The analysis on morphology, thermal stability and functional group showed that condensation of lignin occurred during the liquefaction process, the two-dimensional heteronuclear single quantum correlation (2D-HSQC) investigation demonstrated that the stable structure of lignin provides a favorable foundation for its valorization. Overall, this work proposed a feasible biorefinery strategy for effective conversion and utilization of lignocellulosic biomass.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaoya Zhou,Encheng Liu,Jinze Li,FengFeng Chen,Yan Zhang,Kai Chen,Dongming Qi
The application of high internal phase emulsions (HIPEs) in food, medicine, and cosmetics has been greatly limited due to lack of anti-ultraviolet and anti-oxidant structures. Herein, a series of rodlike TiO2/lignin nanoparticles were prepared by using TiO2 as a hardcore and modified lignin as a coating and dispersion stabilizer. SEM images show that samples have well dispersity and present a rodlike morphology. However, the aspect ratio (AR) values of samples have significant differences due to the presence of different contents of carboxyl and hydroxyl groups in lignin derivatives. Subsequently, their emulsification was predicted by the spreading coefficient and adsorption energy. The results show that the higher AR value of samples, the lower dispersion coefficient and the higher adsorption energy, indicating better emulsification activity. The emulsification test suggests that 0.16 wt % TiO2/arginine-modified lignin with highest AR value could stabilize HIPEs with 90 vol % oil phase volume due to a strong bridging effect. Existing literature shows that the dosage of nanoparticles in HIPEs is the lowest value of other biomass emulsifiers, which shows good biocompatibility. Meanwhile, the oil phase volume of HIPEs in this work is the highest value of other HIPEs prepared with biomass-based particles, which means that these HIPEs would have a higher load capacity for active substances and longer shelf life due to the low water content. The antioxidant experiment shows that TAML could completely clear the •OH, and the scavenging efficiency is 17 times that of pure TiO2. The UV-protection test indicates that the sun protection factor value of TAML reached 149.5, which is the highest value of other lignin-based sunscreen particles. This work provides a method for the preparation of high-performance and multifunctional emulsifiers, which expands the application of lignin and enhances the application potential of HIPEs in medicine, food, cosmetics, and other fields.
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高影响因子
RENEWABLE ENERGY
·
2023
·
IF 8.7
Shanshuai Chen,Puxiang Yan,Xiaona Yu,Wanbin Zhu,Hongliang Wang
The development of a highly active and robust catalyst for the conversion of lignin, the largest volume of renewable aromatic resource in nature, to value-added aromatics is of great importance in sustainable chemistry. However, the condensation of lignin depolymerization intermediates into recalcitrant macromolecules restricts high yields of desired products, and this remains a great challenge in lignin valorization. Here, a serious of bifunctional Ru–ZnO/SBA-15 catalysts were synthesized for lignin conversion to aromatics. Roles of Ru and ZnO in these catalysts for lignin conversion were in-depth analyzed. The effect of the ratio of Ru to ZnO was studied. Other reaction conditions including temperature and time were systematically optimized. More than 51.3% yields of aromatics were obtained over Ru–10ZnO/SBA-15 at 240 °C for 4 h. Structure-activity relationship research of the catalyst revealed that the high yield of product could be attributed to the following three reasons: 1) the Lewis acidic sites on Ru/SBA-15 are significantly improved after ZnO modification, and thus promotes the C–O bond cleavage ; 2) the oxophilic ZnO is beneficial to absorb the substrate and reaction intermediates, and therefore enhances the hydrodeoxygenation activity of the adjacent Ru; 3). The interaction between Zn and Ru in Ru–ZnO/SBA-15 changes Ru electronic properties and leads to the formation of highly active catalytic sites with high electron density. These results indicated that the bifunctional Ru–ZnO/SBA-15 catalyst with high catalytic activity could be a good choice for lignin conversion to high-yield aromatics.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Jialong Wu,Xiaozhen Ma,Pitchaimari Gnanasekar,Fan Wang,Jin Zhu,Ning Yan,Jing Chen
Superhydrophobic polyurethane foam is one of the most promising materials for oil-water separation. However, there are only limited studies prepared matrix superhydrophobic foams as adsorbents. In this paper, SiO 2 modified by 1H, 1H, 2H, 2H-perfluorododecyl trichlorosilane (F-SiO 2 ) was added into the lignin-based foam matrix by a one-step foaming technique. The average diameter of F-SiO 2 was about 480 nm with an water contact angle (WCA) of 160.3°. The lignin-based polyurethane foam with F-SiO 2 had a superhydrophobic water contact angle of 151.3°. There is no obvious change in contact angle after 100 cycles of compression or after cutting and abrasion. Scanning electron microscopy (SEM) analysis showed that F-SiO 2 was distributed both on the surface and inside of the foam. The efficiency for oil-water separation reached 99 %. Under the light intensity of 1 kW/m 2 , the surface temperature of the lignin-based foam rose to 77.6 °C. In addition, the foam exhibited self-cleaning properties and degraded within 2 h in an alcoholic alkali solution. Thus, in this study, we developed a novel matrix superhydrophobic lignin-based polyurethane foam with an excellent promise to be used as oil water separation adsorbents in industrial wastewater treatment and oil spill clean-up processes.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）