FUEL
·
2022
·
IF 8.035
Zhi Yang,Bowen Luo,Riyang Shu,Zhuojie Zhong,Zhipeng Tian,Chao Wang,Ying Chen
Hydrodeoxygenation (HDO) is an indispensable reaction in the field of fuel and chemical production, and the synergistic effect of metal–acid sites in the catalyst makes great influence to it. Herein, a bifunctional catalyst of Ru/C combined with phosphotungstic acid (HPW) was employed for the hydrodeoxygenation (HDO) of lignin-derived compounds to make full use of the synergistic effect of active metal–acid sites. HPW possessed a temperature-controlled phase-transfer behavior, which made it dispersed well on the surface of Ru/C catalyst and resulted in a close integration of acid site with metal site. Ru/C-HPW catalyst also owned the advantage of high reaction rate and good recyclability, which exhibited no obvious catalytic activity loss after 5 runs. Lignin-derived phenolic compounds including monomers and dimers enabled to obtain an efficient transformation to cycloalkanes at the temperature of 200 °C. Moreover, a high HDO reaction efficiency of raw lignin-oil was also observed in this study, with the increasing hydrocarbon content from 5.5% to 78.9%. This novel catalytic system can achieve a high HDO efficiency under mild conditions.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yiying Yue,Yu Wang,Yun Bai,Jingquan Han,Wanli Cheng,Guangping Han,Qinglin Wu,Jianchun Jiang
Solar interfacial evaporation has received widespread attention as an emerging and sustainable approach to solve freshwater scarcity. However, traditional photothermal conversion materials, which are crucial components of solar evaporators, are mostly petroleum-based and are thus non-eco-friendly and expensive. This paper reports the application of aminated phenolated lignin as an efficient photothermal material and elucidates the photothermal conversion mechanism of lignin. By regulating the number of grafted conjugated structures in a simple process, a controllable and efficient photothermal conversion efficiency can be obtained. The biodegradable loofah is utilized as a water transmission layer, and thus an all-biomass solar evaporator was successfully obtained. Additionally, the evaporator enabled an all-day-round seawater desalination by releasing thermal energy stored in the polyethylene glycol loaded in the loofah sponge. The obtained evaporator did not only exhibit a high evaporation efficiency of up to 97.6% with an evaporation rate of 1.75 kg m −2 h −1 under 1 sun, but also showed excellent cost-effectiveness (280 g h −1 $ −1 ), which is superior to that of previously reported evaporators. Furthermore, the evaporator delivered an excellent salt-resistant performance after 25 cycles, which is conducive to long-term practical applications. The prepared evaporator with the characteristics of cost effectiveness, energy conservation, environmental friendliness, ease of preparation, stability, great evaporation efficiency has a great potential in solar evaporation applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Lili Zhang,Yuefeng Huang,Jiaqing Zhang,Enqing Zhu,Jinxia Ma,Zhiguo Wang
A combination of multiple methods can greatly intensify the removal efficiency of hazardous substances. Herein, the synergistic utilization of adsorption and catalysis achieved for the highly efficient removal of hexavalent chromium (Cr 6+ ). A paper-based palladium nanoparticles/UiO-66-NH 2 (PdNPs/UiO-66-NH 2 /LP) composite catalyst was prepared using lignocellulose paper-based material (LP) for the loading of UiO-66-NH 2 MOFs materials, with the lignin in LP as the reducer for the in-situ synthesis of PdNPs (12.3 nm) on UiO-66-NH 2 MOF materials. Lignocellulose paper-based materials with high strength (82 N·m/g) realized low-cost and environmentally friendly preparation and guaranteed the practicability of PdNPs/UiO-66-NH 2 /LP composite catalyst. The prepared PdNPs/UiO-66-NH 2 /LP achieved high-efficiency catalytic activity for hazardous Cr 6+ removal through a constructed adsorption-catalytic synergistic system, in which the removal efficiency of Cr 6+ in 10 min was increased by 2 times compared with a composite catalyst without MOFs loading. Finally, the PdNPs/UiO-66-NH 2 /LP composite catalyst demonstrated the great efficiency and practicality of water pollution treatment through synergistic adsorption enrichment and catalytic reduction.
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PubMed
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 21
·8869-8884
·
IF 9.8
Tian Gao,Shengnan Guo,Jiaojiao Zhang,Jintao Chen,Shiru Yin,Na Peng,Qun Cai,Huan Xu,Yi Liu
The synthesis of low-cost and high-efficiency multicolour emitting graphene quantum dots (GQDs) is of utmost importance for their prospective applications. Lignin, a renewable biomass, contains aromatic compounds that are well-suited for the preparation of polycyclic aromatic GQDs. In this study, we successfully synthesized red, yellow, green, and blue light-emitting single-layered GQDs with high crystallization using hydrothermal methods, thereby covering the full spectrum of visible light. High-resolution transmission electron microscopy (HRTEM) images revealed the presence of a two-dimensional crystal lattice with the 100 (0.21 nm) and 002 (0.24 nm) facets of graphite, indicating the high crystallization of the synthesized GQDs. Additionally, the average height of all GQDs was found to be below 1 nm, confirming their single-layered structure. This observation supports the notion that mono-benzene compounds tend to form fused polycyclic arenes under high pressure and temperature conditions. Moreover, by analyzing X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared (FT-IR) spectra, we investigated the formation mechanism of GQDs derived from lignin at the molecular level. The cleavage of ether bonds, aldol condensation, benzylic acid rearrangement, and dehydration were identified as vital intermediate processes. Furthermore, we successfully demonstrated the application of multicolour-emitting GQDs derived from lignin in light-emitting diodes (LEDs). This synthetic strategy for producing multicolour-emitting GQDs from lignin opens up a new path for the conversion of sustainable biomass into high-value nanomaterials.
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INDUSTRIAL CROPS AND PRODUCTS
·
2021
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IF 5.645
Qing Zhang,Ruoteng Ma,Lisha Ma,Lili Zhang,Yimin Fan,Zhiguo Wang
It is important to improve the interface compatibility between lignocelluloses (LCs) and biodegradable polylactic acid (PLA) for the preparation of strong composite materials. In the current study, esterified lignocellulose nanofibers (LCNFs) with high yield were prepared from LCs with different lignin contents (0.83–17.45 %) by swelling with a lactic acid/choline chloride deep eutectic solvent (LA/ChCl DES) at 100 ℃ for 3 h followed by mechanical colloid milling. Esterification occurred along with nanofibrillation of the LCs to obtain LCNFs having ester bonds with diameters mostly less than 100 nm. Lignin remained in the LCNFs with various contents. Uniform LCNF/PLA composites were prepared by a direct blending method. Lignin in the esterified LCNFs acted as an interface adhesive and played a key role in increasing the LCNFs interface compatibility with PLA, as well as strengthening the mechanical properties of the composites. The optimized flexural properties of the composites reached a maximum value of 204.5 MPa when 20 % LCNF (containing 10.92 % lignin) was added, which was 120.6 % higher than that of pure PLA. The prepared high-strength biodegradable composites have broad application prospects and great potential to replace non-degradable plastics.
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FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Zhe Xiong,Yimin Xiong,Qiaoling Li,Hengda Han,Wei Deng,Jun Xu,Long Jiang,Sheng Su,Song Hu,Yi Wang,Jun Xiang
The vapor-/solid-phase interactions are the inevitable phenomenon in biomass pyrolysis process , which significantly affects the formation of heavy components (molecular weight > 200 Da) in bio-oil (HCO). In this study, to deeply understand the mechanism of the formation of HCO during biomass pyrolysis, the effects of the vapor-/solid-phase interactions among cellulose , hemicellulose , and lignin (biomass three components) on the formation of HCO during pyrolysis were studied in a fixed-bed reactor system. The HCO were analyzed by the FT-ICR MS spectrometer and the UV-F spectrometer. The results showed that the vapor-phase interactions mainly promoted the formation of heavy phenolic compounds at a slow heating rate , and the total content of HCO was increased. The vapor-phase interactions decreased the total content and the O content of HCO obviously at a fast heating rate; meanwhile, the highly reactive compounds (e.g., furans, acids, and ketones) generated from the pyrolysis of cellulose and hemicellulose could interact with the phenol monomers . Thus the phenolic compounds were transformed into large aromatic compounds via the vapor-phase interactions. The solid-phase interactions facilitated the transformation of O-containing structures of the HCO into the char via cross-condensation reaction, decreasing the yield of HCO, especially the phenolic compounds and the saccharides .
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BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Bochao Yan,Xiaoyu Lin,Zhihui Chen,Qinjie Cai,Suping Zhang
Lignin is an abundant renewable source of bio-aromatics and its valorization is of great importance. In this work, an efficient non-precious carbon based metal-Mo 2 C catalytic system for selective production of phenolic monomers (PMs) from organosolv lignin depolymerization is proposed. With the optimized catalyst of Ni-Fe-Mo 2 C, 89.56% of liquefaction and 35.53% of PMs yields were achieved under 260 ℃ for 4 h with water-methanol (4:1 v/v) solvent. Characterization of the catalysts shows that the induction of Ni-Fe species was favor for the formation of β-Mo 2 C, and efficiently promoted the lignin liquefaction. The decoration of Ni/Fe can also change the side chain hydrogenolysis ability of the catalyst and exhibite high yield for 4-ethylphenol (14.77%) production. Methanol, used as co-solvent, was found to play an important role in PMs production and lignin depolymerization. These results demonstrated that the Ni-Fe-Mo 2 C catalytic system has potential to produce valuable phenolic monomers from lignin under mild conditions.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Boqiang Gao,Qianqian Chang,Hu Yang
A series of actinia-shaped lignin-based adsorbents (LNAEs) featuring lignin (LN) as the core and grafted poly(acrylic acid) (PAA) as the tentacle were designed and fabricated. Two fluoroquinolones (FQs) with similar molecular structures, ofloxacin (OFL) and ciprofloxacin (CIP), were used as targets to study the selective adsorption performance of LNAEs associated with the structural effects of the LN-based adsorbents in FQs binary aqueous system. The adsorption of the two FQs by LNAEs complied with the competitive Langmuir isothermal model, and showed selective removal of CIP over OFL due to the additional negative charge-assisted hydrogen bond (CAHB) formed between the carboxyl group of LNAEs and the secondary amino group of CIP, in addition to the effects of electrostatic attraction and normal hydrogen bonds, according to quantitative studies and density functional theory analysis. A binary nonlinear model based on phenomenological theory was applied to study the effects of PAA branched-chain length and distribution on the selective adsorption performance of the LN-based adsorbents. Accordingly, the branched-chain distribution played a more important role and higher distribution density of branched PAA could expose more adsorption sites on LNAEs' surface and improve the adsorptive selectivity . This study offers a well understanding of the structure–activity relationship of the surface grafting-modified adsorbents in binary pollutant systems and fundamental guidance for the exploitation and design of novel and efficient adsorbents.
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FUEL
·
2020
·
IF 5.578
Wenliang Wang,Xubiao Wang,Zhenhao Ma,Chao Duan,Shiwei Liu,Hailong Yu,Xinping Li,Liping Cai,Sheldon Q. Shi,Yonghao Ni
Lignin is considered as a renewable and sustainable resource for producing value-added aromatic chemicals and functional carbon materials. Herein, we develop a one-step catalyst-free depolymerization strategy to convert lignin into aryl monomers and carbon nanospheres simultaneously. Importantly, microwave-assisted depolymerization (MAD) in conjunction with dichloromethane (CH 2 Cl 2 ) vapors is developed. The total mass yield of guaiacols reached the highest amount of 225.1 mg/g at 600 °C, and the highest yields of phenols (49.0 mg/g) and aromatic hydrocarbons (155.1 mg/g) were obtained at 700 °C. Hydrogen radicals and hydrogen chloride (HCl) are in-situ formed from CH 2 Cl 2 , significantly decreasing the activation barrier and reforming pyrolysis vapors to promote the formation of aryl monomers. Interestingly, uniform carbon nanospheres with an average size of 140 nm were produced as co-products at 700 °C. The microwave “hot-spots”, allied with the continuous surface erosion and the decrease in surface energy of lignin-derived carbon precursors by CH 2 Cl 2 vapor, can be considered the driving force for the ultimate formation of carbon nanospheres. The CH 2 Cl 2 /MAD system produces aryl monomers (26.8 wt% yield) and carbon nanospheres (36.6 wt% yield) at 700 °C. We provide a facile, intriguing and scalable approach to convert lignin to valuable aryl monomers and sustainable carbon materials that can be applied in the chemistry, energy and environmental fields.
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BIOMACROMOLECULES
·
2021
·
IF 6.988
Zhongzheng Ma,Jiake Wang,Yongqi Deng,Yan Wang,Lifeng Yan
A new strategy has been developed to synthesize deep eutectic solvent (DES)-based lignin eutectogels by the chemical crosslinking of homogeneously dispersed lignin with poly(ethylene glycol)diglycidyl ether (PEGDE) in a ternary DES of choline chloride (ChCl)/urea/glycerol. The as-prepared lignin eutectogels have high ionic conductivity, high strength, and extreme temperature stability, which can be used as sensors for flexible electronics. N-doped hierarchical porous carbons (HPCs) are prepared when the eutectogels were solvent-replaced and sintered in the atmosphere of N2 and CO2, which results in the formation of porous carbon with a sufficient specific surface area and a three-dimensional framework composed of a hierarchical porous structure. They were used as electrodes with excellent capacitance performance attributed to the synergy of reasonable pore size distribution and excellent nitrogen doping efficiency. The electrode displayed a significantly enhanced specific capacitance (270 F g–1 at a current density of 1.0 A g–1 in a three-electrode system and 224 F g–1 at 0.5 A g–1 in a two-electrode system) and high-performance stability (7% capacitance loss over 10,000 cycles at 8 A g–1) as a supercapacitor electrode. It indicates the great promise of the lignin eutectogels for both sensing and energy storage applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Huihui Xie,Hui Zhang,Xinxin Liu,Shenglong Tian,Yunsi Liu,Shiyu Fu
A lignin-based PU coating was prepared for paper-based green packaging. Two representative diisocyanate were used to prepare the coatings. Due to the rigid aromatic, the physical properties of the TDI system reached the maximum below the lignin content of 40%. The HDI that contains flexible aliphatic chains alleviated the brittleness of coating, and it showed physical advantages when the lignin content was more than 50%. Owing to the high lignin content, the coating presented enhanced thermal stability . After coated with the lignin-based PU coatings, the dry tensile strength of coated paper was improved by 126%. Amazingly, the wet strength was increased from 0.31 to 12.6 MPa with an improvement nearly 40 times. Based on the coordination of lignin, Ag + was introduced into the PU matrix, which imparted the coating with excellent antibacterial ability. The colony forming units of E. coli and S. aureus were both less than 1. However, no inhibition halo was observed, which indicated that the Ag was firmly anchored on the coating and the antibacterial ability is only available when the bacterial contact the coating surface. The lignin-based PU coating with favorable sustainability and properties shows great potential in paper-based green packaging fields.
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ACS Catalysis
·
2018
·
IF 11.384
Huifang Liu,Hongji Li,Jianmin Lu,Shu Zeng,Min Wang,Nengchao Luo,Shutao Xu,Feng Wang
Photocatalysis is a potentially promising approach to harvest aromatic compounds from lignin. However, the development of an active and selective solid photocatalyst is still challenging for lignin transformation under ambient conditions. We herein report a mild photocatalytic oxidative strategy for C–C bond cleavage of lignin β-O-4 and β-1 linkages using a mesoporous graphitic carbon nitride catalyst. Identifications by solid-state NMR techniques and density functional theory (DFT) calculations indicate that π–π stacking interactions are most likely present between the flexible carbon nitride surface and lignin model molecule. Besides, low charge recombination efficiency and high specific surface area (206.5 m2 g–1) of the catalyst also contribute to its high catalytic activity. Mechanistic investigations reveal that photogenerated holes, as the main active species, trigger the oxidation and C–C bond cleavage of lignin models. This study sheds light on the interaction between complex lignin structures and the catalyst surface and provides a new strategy of photocatalytic cleavage of lignin models with heterogeneous photocatalysts.
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