ENERGY & FUELS
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2023
·
IF 5.3
Yingbo Zhu,Nan Ma,Yulong Ma,Yonggang Sun,Liqiong Wang,Yuanyuan Li,Tingting Gao,Feng Lin
To obtain value-added fuels and chemicals from lignin, it is necessary to explore an efficient catalytic system for hydrodeoxygenation (HDO). In this study, a highly efficient and magnetically separable Ni@C catalyst was synthesized for conversion of lignin-derived phenols. Detailed results showed that the pyrolysis temperature played a crucial role in the difference of the carbon-defect degree, which increased the metal dispersion and the strong electronic metal–support interactions. Meanwhile, we revealed that the differentiated pyrolysis temperature induced the appropriate presence of Ni2+ as Lewis acid sites and Niδ+ as heterohydrogen cleavage sites, which provided an acceleration effect for the HDO reaction. The results displayed that higher reactivity of lignin-derived phenols into C6+ cycloalkanols was achieved over the Ni@C catalyst (100% conversion and 87.19% selectivity). Moreover, the high selectivity of C6+ cycloalkanes was achieved after adding H-ZSM-5 as Brønsted acid sites (100% conversion and 100% selectivity). This investigated work offers an efficient strategy for conversion of lignin-derived aromatics into value-added chemicals.
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高影响因子
ChemSusChem
·
2022
·Vol. 16
·期 5
·e202202071
·
IF 9.14
Xiaozhen Ma,Shuqi Li,Fan Wang,Jialong Wu,Yeyan Chao,Xun Chen,Peng Chen,Jin Zhu,Ning Yan,Jing Chen
Graphical A catalyst-free dynamic covalently cross-linking polyurethane was successfully prepared by a one-step method using untreated lignin. And by adjusting the lignin content and the isocyanate index, the properties of LPUs could be adjusted. Mechanical properties of LPUs could be significantly improved by extrusion. In addition, it exhibited editable shape memory function. Therefore, this paper can provide new ideas for the structural design of lignin-based polyurethanes. Here a new strategy of catalyst-free direct synthesis of covalent adaptable network polyurethanes (LPUs) from lignin with editable shape memory effect is reported. Using unmodified lignin, PEG, and isocyanate under the condition of the isocyanate index less than 1.0 (NCO/OH<1.0), a variety of LPUs are obtained. When NCO/OH=0.8, a stable cross-linked network can be formed (ex. the gel content of LPU50-0.8 was 98±0.3 %). The activation energy ( E a ) value of LPUs is similar to that of polyhydroxyurethanes (PHUs), at around 110 kJ mol −1 . With an increase of lignin content, the LPUs show a transition from ductile fracture to brittle fracture mode. And the mechanical properties of LPUs are significantly enhanced after extrusion processing, with the maximum modulus reaching 649±26 MPa and the maximum toughness up to 9927±111 kJ m −3 . The improvement in mechanical properties is due to the homogenization of complex cross-linked network under the powerful external force of the extruder and the lignin that originally was free in the system participated in the exchange reactions. Moreover, LPUs can also be prepared continuously in one step by using an extruder as the reactor. In addition, LPU50-0.8 has an editable shape memory effect. This study develops a novel method for the synthesis of LPU from lignin with NCO/OH<1.0, showcasing new possibilities for value-added utilization of lignin, and expands the bio-based products portfolio from biomass feedstock to help meet future green manufacturing demands.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Enmin Zong,Runfang Fan,Hao Hua,Jiayao Yang,Shengtao Jiang,Jinfeng Dai,Xiaohuan Liu,Pingan Song
It has been always attractive to design a sustainable bio-derived adsorbent based on industrial waste lignin for removing organic dyes from water. However, existing adsorbent strategies often lead to the difficulties in adsorbent separation and recycling. Herein, we report a novel magnetically recyclable bio-adsorbent of Mg(OH) 2 /Fe 3 O 4 /PEI functionalized enzymatic lignin (EL) composite (EL-PEI@Fe 3 O 4 -Mg) for removing Congo red (CR) by Mannish reaction and hydrolysis-precipitation. The Mg(OH) 2 and PEI functionalized EL on the surface act as active sites for the removal of CR, while the Fe 3 O 4 allows for the easy separation under the help of a magnet. As-obtained EL-PEI@Fe 3 O 4 -Mg forms flower-like spheres and has a relatively lager surface area of 24.8 m 2 g −1 which is 6 times that of EL. The EL-PEI@Fe 3 O 4 -Mg exhibits a relatively high CR adsorption capacity of 74.7 mg g −1 which is 15 times that of EL when initial concentration is around 100 mg L −1 . And it can be easily separated from water by applying an external magnetic field. Moreover, EL-PEI@Fe 3 O 4 -Mg shows an excellent anti-interference capability according to the results of pH values and salt ions influences. Importantly, EL-PEI@Fe 3 O 4 -Mg possesses a good reusability and a removal efficiency of 92 % for CR remains after five consecutive cycles. It is illustrated that electrostatic attraction, π-π interaction and hydrogen binding are primary mechanisms for the removal of CR onto EL-PEI@Fe 3 O 4 -Mg. This work provides a novel sustainable strategy for the development of highly efficient, easy separable, recyclability bio-derived adsorbents for removing organic dyes, boosting the efficient utilization of industrial waste lignin.
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PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Lei Jiang,Zeng Liu,Jia Liu,Shu He,Xing Wu,Wei Shao
A supramolecular lignin-containing hydrogel was constructed via host-guest interaction and dynamic redox system. The dynamic redox reaction between Ag + and polyethylene glycol-lignosulfonate (PEG-LGS) could trigger free radical polymerization. The host-guest interaction between α-cyclodextrin and PEG-LGS could effectively enhance the adhesiveness and mechanical properties. The hydrogel exhibited a typical three dimensional structure with uniformly distributed silver nanoparticles . It exhibited an elongation at break of 1390%, a fracture stress of 171 kPa. The hydrogel displayed strong adhesiveness towards various surfaces that the adhesion strength of the hydrogel to aluminum reached as high as 48 kPa. The hydrogel displayed great conductivity as high as 2.71 S/m and good self-healing behavior. The hydrogel could be applied as strain sensor and pressure sensor. Most importantly, this hydrogel sensor exhibited high sensitivity over a wide strain range with the GF values of 3.06, 5.92, and 10.38 in the strain ranges of 0–80%, 80%–240%, and 240%–1000%, respectively.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Tingting Xu,Huanli Gao,Jiahuan Zhou,Ming He,Xingxiang Ji,Hongqi Dai,Orlando J. Rojas
There is an urgent need to develop materials to prevent bacterial infection and the deleterious effects of endotoxins. In this study, we introduce a one-step electrodeposition method to prepare films composed of chitosan/Ag/polypyrrole and layer-by-layer self-assembly to introduce lignin sulphonate (LS) to obtain chitosan/Ag/polypyrrole/LS films. Antibacterial effects against both E. coli and S. aureus are shown by bacterial growth profiles and observation of bacteriostatic zones. Meanwhile, the addition of self-assembled LS improved the antibacterial effect of the film. For E. coli , the inhibition zone diameter was 0.93 cm, while for S. aureus , the inhibition zone diameter was 0.72 cm. Rapid and efficient endotoxin adsorption effects were shown whereby the electrostatic interactions between chitosan and endotoxin molecules played a major role. After adsorption for 1 h, in initial concentration of 1 EU/mL endotoxin solution, the adsorption efficiency could reach up to 85 %, while in initial concentration of 5 EU/mL endotoxin solution, the adsorption efficiency could reach up to 87.6 %. The results suggest chitosan/Ag/polypyrrole/LS films for their capability as a new type of antibacterial film with intrinsic endotoxin adsorption activity.
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PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Yuan He,Hai-Chuan Ye,Ting-Ting You,Feng Xu
The natural biopolymers hold substantial prospects as food packaging materials due to the integrated advantages of excellent film-forming properties, biodegradability and appropriate mechanical properties. However, it remains a challenge to simultaneously endow antimicrobial, UV-shielding, water vapor and oxygen barrier properties of films. Herein, sustainable and multifunctional films were fabricated by constructing ε-polylysine (ε-PL) antimicrobial surface on the phenolated lignin/cellulose films (RCPL30). It is found that the fine control of electrostatic interactions and hydrogen bonding in anionic phenolated lignin/cellulose and cationic ε-PL is efficient for tailoring the structure and films performance. The addition of ε-PL effectively enhanced the antibacterial property , hydrophobicity, water vapor and oxygen barrier ability of the phenolated lignin/cellulose films. Antibacterial cellulose-lignin films with a high lignin content (30%) were developed. In particular, the bactericidal rate reached almost 100% when the ε-PL concentration was 3% (LRCPL30-3). The water vapor permeability and oxygen permeability of LRCPL30-3 were as low as (3.21 ± 0.06) × 10 −11 g m −1 s −1 Pa −1 , (4.15 ± 0.13) × 10 −16 cm 3 cm/cm 2 s Pa, respectively. Moreover, the phenolated lignin provided an exceptional UV shielding properties (100% for UVB and 99.91% for UVA for LRCPL30-3 sample) with high thermal stability and antioxidant activities . More importantly, the as prepared LRCPL30-3 still showed high tensile strength (75.90 MPa). Based on these outstanding properties, LRCPL30-3 were used for shrimp package, which effectively extended shelf-life. Overall, the study highlights the benefits of biopolymers valorization and provides evidence of potential applicability of sustainable films (specially LRCPL30-3) as candidates for active food packaging.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Banglun Xiong,Sen Ma,Binglin Chen,Yunchao Feng,Zhiqing Peng,Xing Tang,Shuliang Yang,Yong Sun,Lu Lin,Xianhai Zeng,Yong Chen
A large number of bamboo waste is produced from bamboo processing industries. Bamboo waste, with high biomass yield and rich in xylan and glucan , is a promising material for the coproduction of xylo-oligosaccharides and glucose. In this work, a formic acid-facilitated hydrothermal pretreatment of bamboo was investegated to increase the yield of xylo-oligosaccharides by controlling the severity factor (SF) and formic acid concentration. The maximum xylo-oligosaccharides yield was 68.04 % (of initial xylan) and the concentrations of X 2 , X 3 , X 4 , and X 5 were 4.56, 3.08, 2.30 and 2.58 g/L, respectively. The highest enzymatic hydrolysis yield reached 93.05 % at 45 FPU/g cellulase dosage. Additionally, lignin isolated after formic acid pretreatment (FA-lignin), and lignin from alkali extraction (AE-lignin) had better thermal stability than milling wood lignin (MWL), which could be used in fire-retardant material applications. The techno-economic analysis predicts a revenue of 118.86 USD by processing 100 kg of waste bamboo combined with enzyme cost analysis. To conclude, xylo-oligosaccharides (12.56 kg), xylose (4.81 kg), glucose (22.37 kg) and lignin (13.28 kg) were produced from bamboo (100 kg, 18.37 % xylan, 44.29 % glucan, 27.23 % lignin). The results can give insights into establishing an efficient acid pretreatment of bamboo waste to produce xylo-oligosaccharides, glucose and lignin.
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高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Zhaosong Hu,Yingchun Liu,Jinxin Lin,Haohan Wu,Bowen Liu,Weiqi Guo,Xuliang Lin,Liheng Chen,Xueqing Qiu,Yanlin Qin
High-thermal-conductivity (λ) nanocomposites have been thought to resolve thermal management issues in electronic development. However, use of these is still challenging due to the easy aggregation of micro/nanofillers in a matrix. Here, a high-efficiency, low-cost, environmental strategy was developed wherein pyrene-functionalized alkali lignin (AL-PPBA) dispersants were employed to disperse hydroxylated boron nitride nanosheets (BNNS) by π–π conjugation in a cellulose nanofiber (CNF) solution, following which a nanocomposite film was prepared via the vacuum-assisted self-assembly method. Experimental and simulation results show that an efficient interfacial interaction between AL-PPBA and BNNS was achieved successfully and a stable aqueous dispersion solution was obtained. The as-prepared nanocomposites thus show λ as high as 18.27 W m–1 K–1 with the loading of 10.4 vol % of BNNS and superior anisotropy. A potential thermal management capability was demonstrated when using nanocomposites as heat sink components for light-emitting diode (LED) chips. This study provides a route to promote the dispersity of micro/nanofillers via a noncovalent cross-linking strategy and address heat management issues.
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高影响因子
FUEL
·
2023
·
IF 7.4
Xiaoqi Wang,Xinhua Qi,Mo Qiu,Feng Shen,Jirui Yang,Boxiong Shen
Herein, a Ni/Ru bimetallic ordered mesoporous carbon (Ni/Ru@WOMC) was prepared through solvent evaporation induced self-assembly (EISA) method with walnut shell organosolv lignin as carbon precursor and Ni 2+ as crosslinking agent followed by impregnating small amount of Ru, where the mass ratio of Ni/Ru was about 10:1. The resulting material showed superior catalytic activity on hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL). A nearly 100 % GVL yield could be obtained in 2-propanol solvent under mild conditions at a low reaction temperature of 80 °C in 4 h reaction time. The Ni/Ru@WOMC catalyst could be used at least 5 times without obvious loss of its catalytic performance, which can be ascribed to the confinement effect provided by their ordered mesoporous structure. This successful development of Ni/Ru@WOMC in the hydrogenation of LA to GVL opens up new opportunities for the catalytic application of lignin derived functionalized ordered mesoporous carbon in biomass transformation reactions.
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高影响因子
Crystals
·
2023
·Vol. 13
·期 6
·983
·
IF 2.7
Hao Zhao,Zishuai Jiang,Chengyu Wang,Yudong Li
The research on rapid and efficient detection of microplastics in water is still in its early stages. Fluorescence feature recognition represents an important and innovative approach to microplastic detection. While carbon quantum dots have been widely used in various environmental detection methods, their use for detecting microplastics in water environments has been rarely reported. In this study, N and Cl co-doped carbon quantum dots were synthesized via a hydrothermal method. The heteroatom doping process endowed them with blue luminescence properties, and their adsorption for microplastics was improved through the introduction of positive and negative charges and intermolecular forces. By utilizing a combined mechanism of fluorescence and Rayleigh scattering, the detection of polystyrene microplastics with three different particle sizes was achieved. In the detection process, it exhibits excellent light stability. Notably, the nano-polystyrene exhibited a good nonlinear relationship within the range of 0.01 g/L to 0.001 g/L, with R2values of 0.923 and 0.980 and a detection limit of 0.4 mg/L. These findings provide a novel approach for the detection of nano microplastics.Keywords:lignin;carbon quantum dots;co-doping;microplastic detection
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高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 23
·e202203483
·
IF 2.1
Wenyao Peng,Shanshan Wang,Junjian An,Chenyang Hu,Jian Zhang,Peng Wang
Graphical GO-Cu 2 (OH) 3 NO 3 composite is prepared by using thermal calcination method. The composite exhibits larger specific surface area and stronger heterogeneous catalysis activity than those of Cu 2 (OH) 3 NO 3 . Under optimal conditions, ferulic acid could be degraded efficiently by heterogeneous process catalyzed by the composite. The environmental-friendly composite exhibits stable chemical properties, which could be reused and recycled successfully. Graphene oxide (GO)-Cu 2 (OH) 3 NO 3 composite was prepared by a thermal calcination process and evaluated as an effective heterogeneous catalytic material. The composite displayed prominent activated performance to persulfate, which was influenced by preparation condition and the reaction parameters in catalytic system. Under optimal reactive conditions, the GO-Cu 2 (OH) 3 NO 3 composite yielded rapid degradation of ferulic acid, which the corresponding apparent rate constant was 1.12×10 −1 min −1 . Catalytic mechanism analysis showed that the main oxygen species were ⋅SO 4 − and ⋅OH. Among them, ⋅OH made the main contribution in the catalytic system. The analysis of degradation intermediates of ferulic acid showed that the compound could be mineralized to small molecules. The remarkable enhanced heterogeneous catalytic performance of GO-Cu 2 (OH) 3 NO 3 was due to a larger specific surface area, high adsorption capacity and a high mass transfer efficiency of oxidizing radicals in the reactive system.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Rui Lou,Lingxuan Bai,Wei Zhang,Guiyun Huang,Zhe Zhang,Mingfang Wu,Can Wang,Hui Cai,Jiulong Sha
The urgent demand for stable, consistent, eco-friendly, and reliable power sources ultimately promotes the creation of new green energy materials. Due to their singular capacity of achieving efficient energy conversion between heat and power, nanoporous carbon-based thermally chargeable supercapacitors (TCS) have drawn interest due to their multiple applications in gathering of low-grade and waste heat. High-performance TCS is significantly influenced by the amount of active surface area and distribution of pore sizes of the electrode materials. Herein, the optimized porous flowery carbon made from enzymatic lignin has a high specific surface area of up to 897 m 2 g −1 , which gives it a promising thermal charging performance and the superior capacity to accommodate a large number of ions. With a temperature differential of 45 °C (K), the TCS using this carbonized flowery lignin electrode is capable of producing an open-circuit voltage of 513 mV with a Seebeck coefficient as high as 11.40 mV K −1 . This work not only demonstrates the applicability of carbonized lignin as an advanced material for energy applications but it also offers a fresh viewpoint on the advancement of TCS.
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高影响因子
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