CELLULOSE
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2017
·Vol. 24
·期 12
·5327-5339
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IF 3.417
Gan Linhuo,Zhu Jundong,Lv Li
Acidic carbonaceous solids were synthesized from mass pine alkali lignin via hydrothermal carbonization followed by sulfonation. Hydrothermal carbonization of lignin in the presence of acrylic acid (LAHC-SO 3 H) provided many more carboxylic groups than that in the absence of acrylic acid, allowing subsequent sulfonation to produce a highly active and stable catalyst for cellulose hydrolysis in the [BMIM]Cl-H 2 O solvent system. The hydrochar and catalyst were characterized using field emission scanning electron microscopy, X-ray diffractometer, X-ray photoelectron spectroscopy, thermal gravimetric analysis, Fourier transform infrared spectrometer, Brunauer–Emmett–Teller and acid–base titration. Results showed that a high acid content of 5.48 mmol/g, including carboxylic group (2.85 mmol/g), phenolic hydroxyl group (1.05 mmol/g) and sulfonic acid group (1.58 mmol/g), contributed significantly to the highly efficient hydrolysis of cellulose. Further, it was found that addition of trace water in [BMIM]Cl was favorable to cellulose hydrolysis. The highest yield (75.4%) of total reducing sugar (TRS) obtained in [BMIM]Cl-H 2 O at a mass ratio of 100:1 was more than twice that (36.1%) achieved in [BMIM]Cl without water; the corresponding reaction conditions were 50 mg of microcrystalline cellulose, 30 mg of catalyst, 1.0 g of [BMIM]Cl, 10 mg of H 2 O, reaction temperature of 130 °C and reaction time of 2 h. Furthermore, the TRS yield with 5 cycles for LAHC-SO 3 H was higher than 68.1%, and the catalytic activity of catalyst could be fully recovered (74.0% of TRS yield) easily by regeneration.
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ACS Sustainable Chemistry & Engineering
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2017
·
IF 5.951
Tao Zheng,Dafeng Zheng,Xiaokang Li,Cheng Cai,Hongming Lou,Weifeng Liu,Xueqing Qiu
To improve the dispersion capacity of poly(carboxylate ether) (PCE) in clay-containing cement paste, lignosulfonate (LS) was quaternized with 3-chloro-2-hydroxypropyl trimethylammonium chloride (CHPTAC), and the product quaternized lignosulfonate (QL) was characterized by FT-IR spectroscopy, element analysis, and zeta potential. The fluidity of the montmorillonite- (MMT-) containing cement paste was clearly improved upon the addition of 0.010 wt % QL, as the yield stress and the rheological behavior index of the paste were reduced. XRD analysis indicated that the adsorption of QL on MMT was driven by a strong electrostatic attraction, rather than intercalation, which was much stronger than that for LS. DLS also showed that the steric effect of QL was much stronger than that of PCE. As a result, when QL and PCE were added to the MMT-containing cement paste, QL adsorbed on the MMT surface preferentially and hindered the adsorption of PCE.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Li Ai,Li Chen,Guiming Ou,Xuebing Wang,Ming Lei
Conductive self-healing hydrogels have dual properties of self-healing and conductivity, and have become a research hotspot in recent years as a new member of the smart material family. However, it is still a great challenge to prepare hydrogels with excellent performance through simple synthesis steps and low-cost raw materials. Most current hydrogels have problems such as low mechanical strength and poor tensile properties, making it difficult to meet the needs of practical applications in wearable devices. Here, a conductive self-healing hydrogel PVA-B(OH) 3 -CL-Gly 2 was prepared simply and quickly based on the dynamic borate ester bond formed by the reaction of boric acid and polyvinyl alcohol. PVA-B(OH) 3 -CL-Gly 2 has various properties such as self-healing capabilities, excellent physical and mechanical properties (maximum breaking strain of 310 %, maximum tensile strength of 251 kPa), conductivity (conductivity of 0.37 S/m), and anti-freeze properties. As a sensor, PVA-B(OH) 3 -CL-Gly 2 can be utilized for motion monitoring and exhibits good specificity in recognizing both large and subtle movements of the human body. In summary, the prepared PVA-B(OH) 3 -CL-Gly 2 hydrogel effectively addresses the limitations of traditional conductive hydrogels, which are often confined to a single application environment and have few application scenarios. This hydrogel demonstrates significant potential for multifunctional applications in fields such as artificial intelligence, sports management, soft robotics, and human-machine interfaces.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2024
·
IF 4.4
Xiaohui Yang,Qi Ye,Fei Ge,Minghao Zhou
Lignin, as an important biomass resource, has significant research value in its oxidative cleavage process. Nickel-based metal catalysts could selectively depolymerize lignin. A series of heteropolyacid doped nickel based bimetallic catalysts Ni 4 Mo 1 -MOF-x（x represented heteropolyacid）were prepared by hydrothermal method, which were calcined to catalyze the oxidative cleavage of lignin model compound (2-phenoxy-1-acetophenone). The catalyst Ni 4 Mo 1 -MOF-SiWA-0.1(500) showed the best catalytic performance in methanol solvent under conditions of 160 °C, 4 h, 0.5 MPa oxygen pressure, where the conversion rate was nearly 100 % and the yields of phenol and benzoic acid were 54.5 % and 23.3 %, respectively. The catalysts were well characterized to explore the catalytic performance during the oxidation of lignin dimer. This study could provide some interesting and useful information for the catalytic oxidation of lignin to biomass-derived chemicals.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Jiantao Su,Xiaohui Yang,Hui Shi,Shuangquan Yao,Minghao Zhou
Catalytic conversion of biomass-derived value-added chemicals was of great significance for the utilization of renewable biomass resources to instead of fossil chemicals. Biomass-derived lignin was regarded as an important support and 5-hydroxymethylfurfural (HMF) was a vital platform chemical derived from cellulose. Herein, a series of lignin-MOF hybrid catalysts were prepared and modified with different heteropolyacids (HPAs), which were then successfully introduced into the selective conversion of HMF to 5-hydroxymethylfurfuryl alcohol (MFA). The effect of different HPA, calcination temperature, etc. were all studied, and all catalysts were well characterized. It was confirmed that silicotungstic acid modified catalyst (Ni 3 Co-MOF-LS@HSiW) exhibited the best catalytic performance, while the highest conversion of HMF was up to 100%, with the best MFA yield of 86.5%. The finding in this study could provide novel insights for the utilization of lignin and preparation of value-added biomass-derived chemicals.
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INDUSTRIAL CROPS AND PRODUCTS
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2024
·
IF 5.6
Ying Zhu,Fudong Zhang,Ruohong Bian,Guodong Zeng,Jiongjiong Li,Yan Lyu,Jianzhang Li
The preparation of industrial lignin-based adhesives generally requires the use of large amounts of petrochemical products or toxic and hazardous reagents, which severely limits their widespread application in the wood-based panel industry. In this study, we present a novel approach for synthesizing an eco-friendly lignin-based wood adhesive using aminated alkali lignin (AAL) and epoxy-terminated hyperbranched polyester (EHBP). The AAL was prepared by aminating alkali lignin through a green and formaldehyde-free method. The EHBP was synthesized by grafting epichlorohydrin onto biomass-derived hyperbranched polyester. The resulting adhesive performed excellent bonding strength of 2.41 MPa and debonding work of 0.711 J, which were 3.63 and 15.2 times higher than those of the pure lignin adhesive, respectively. This exceptional bonding strength surpassed that of most previously reported biomass adhesives. The moisture uptake value of the adhesive decreased by 75.6 % and the residual rate increased by 239.2 %. In addition, the prepared adhesive exhibited enhanced mold resistance. Importantly, the adhesive was primarily composed of biomass materials and their derivatives and was less costly than most commercial formaldehyde-based and bio-based adhesives. This work presents new possibilities for the high-value utilization of industrial lignin and the development of formaldehyde-free and environmentally friendly adhesives.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Xinzhou Wang,Longchao Ma,Xuqin Xie,Zhaoyang Xu,Chayanoot Kositanont,Chotiros Dokkhan,Yan Yao,Yanjun Li
The flattened bamboo board (FB) has garnered widespread attention recently due to its ability to enhance bamboo utilization and reduce adhesive consumption. However, FB is primarily composed of three macromolecules: cellulose, hemicellulose, and lignin, making it a flammable material. Meanwhile, FB lacks lateral cell tissues, and its relatively low permeability poses challenges for flame-retardant modification. This work introduces an “H 2 O 2 pretreatment-vacuum impregnation-curing” strategy to fabricate the fireproofing of a superior CaCO 3 -mineralized flattened bamboo board (CaCO 3 -FB). The results indicate that H 2 O 2 pretreatment not only enhances the liquid permeability of FB but also maintains a lignin retention rate as high as 69.1 %. The partial retention of lignin, which has a bonding effect, preserves the structural integrity of FB. Cone calorimetry tests show that CaCO 3 -FB significantly reduces peak heat release rate (PHRR), total heat release (THR), peak smoke production rate (PSPR), and total smoke production (TSP) by 34.6 %, 52.9 %, 22.2 %, and 53.6 %, respectively. Overall, the production of flame-retardant FB is successfully achieved through the partial retention of lignin and mineralization of CaCO 3 , which holds great potential to drive significant advancements in the bamboo industry.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Chen Ouyang,Haonan Zhang,Yanchen Zhu,Jin Zhao,Hao Ren,Huamin Zhai
Biodegradable polylactic acid (PLA) nanofibrous mats prepared by electrospinning serve as suitable packaging materials. However, their practical applications are limited by their weak mechanical properties, poor thermal stability, and high cost. In this study, green and low-cost lignin-containing cellulose nanocrystals (LCNCs) with different lignin contents were developed and employed as reinforced materials to synergistically enhance the thermal, mechanical, and hydrophobic properties of PLA electrospun nanofibrous mats. The presence of moderate lignin improved the interfacial compatibility between the LCNCs and PLA, resulting in excellent mechanical properties of the nanofibrous mats. Compared to pure PLA mats, the tensile strength of the composites reached up to 21.0 MPa, representing a 6.6-fold increase. Its toughness was synchronously enhanced by 16 times, reaching a maximum of 3.6 MJ/m 3 . The maximum decomposition temperature of PLA/LCNCs electrospun nanofibrous mats increased from 339 °C to 365 °C. Furthermore, the increase in lignin in the LCNCs positively contributed to improving the hydrophobicity of the PLA/LCNCs electrospun nanofibrous mats. This bio-based strategy of LCNCs employed in the enhancement of fully bio-based PLA nanofibrous mats offers a viable approach for the advancement of packaging films.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xiaowen Zhong,Jianglin Liu,Bowen Liu,Xiaofei Wang,Xuliang Lin
The development of productive and durable non-precious metal catalysts for the sluggish oxygen evolution reaction (OER) is critical for water splitting. Herein, a novel NiSe-FeO x heterojunction encapsulated in lignin-derived carbon layer (NiSe-FeO x @LC) was synthesized via hydrothermal self-assembly and in-situ pyrolysis . NiSe-FeO x @LC exhibited excellent OER performance with an overpotential of 265 mV at 50 mA·cm −2 , a Tafel slope of 83 mV·dec −1 , as well as long-term stability. Both experimental and DFT calculation results indicated that the doping of FeO x into NiSe@LC successfully optimized the dual interface structure between NiSe and FeO x , thereby promoted the d-bands orbital hybridization, that facilitated electron transfer . Besides, the carbon coating effectively protected the NiSe-FeO x components from leaching and agglomerating during the reaction. This study provides insight into the significance of lignin-derived carbon-encapsulated metallic catalyst for electrocatalytic OER process.
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PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Jinsong Wang,Farzad Seidi,Xiaotong Shi,Chengcheng Li,Yang Huang,Huining Xiao
In the current research, we explored the fabrication of thermo-reversible polymer networks made of bio-based materials to address the growing need for greener and more sustainable polymer coating . Herein, we developed thermally self-healing lignin-based coatings with strong anticorrosion performances through Diels-Alder crosslinking strategy. Accordingly, organosolv lignin was first functionalized by furan moieties and then used for thermally crosslinking by 4,4′-bismaleimidodiphenylmethane (BMI) after spin casting on the surface of steel sheets. Under the optimum conditions, the obtained coating could generate smooth and defect free layers. A thin layer (18 μm) of this coating could increase the E corr from −481 mV (for bare steel) to +142 mV and reduced the corrosion rate (CR) over 3300 times. Importantly, the thermo-reversibility of the network endows excellent self-healing ability to the coating. Indeed, lignin self-healing coatings based on thermo-reversible Diels-Alder reaction provides a creative strategy for bio-based materials applied in anticorrosion applications with high-performance.
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ACS Nano
·
2024
·
IF 15.8
Jie Wang,Zhichen Xiong,Yaxun Fan,Hongliang Wang,Changcheng An,Bo Wang,Ming Yang,Xue Li,Yan Wang,Yilin Wang
Excessive usage of biologically toxic fungicides and their matrix materials poses a serious threat to public health. Leveraging fungicide carriers with inherent pathogen inhibition properties is highly promising for enhancing fungicide efficacy and reducing required dosage. Herein, a series of coacervates have been crafted with lignin and surfactin, both of which are naturally derived and demonstrate substantial antifungal properties. This hierarchically assembled carrier not only effectively loads fungicides with a maximum encapsulation efficiency of 95% but also stably deposits on hydrophobic leaves for high-speed impacting droplets. Intriguingly, these coacervates exhibit broad spectrum fungicidal activity against eight ubiquitous phytopathogens and even act as a standalone biofungicide to replace fungicides. This performance can significantly reduce the fungicide usage and be further strengthened by an encapsulated fungicide. The inhibition rate reaches 87.0% when 0.30 mM pyraclostrobin (Pyr) is encapsulated within this coacervate, comparable to the effectiveness of 0.80 mM Pyr alone. Additionally, the preventive effects against tomato gray mold reached 53%, significantly surpassing those of commercial adjuvants. Thus, it demonstrates that utilizing biosurfactants and biomass with intrinsic antifungal activity to fabricate fully biobased coacervates can synergistically combine the functions of a fungicide carrier and antifungal agent against phytopathogens and guarantee environmental friendliness. This pioneering approach provides deeper insights into synergistically enhancing the effectiveness of agrochemicals from multiple aspects, including fungicide encapsulation, cooperative antifungal action, and droplet deposition.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
·
IF 5.8
Yu Han,Zilu Zhang,Boyang Sun,Yan Jiao,Tao Li,Zhihe Li,Weiming Yi,Shaoqing Wang
This study focuses on the use of a molten salt reaction medium (NaCl-KCl-LiCl) in the lignin pyrolysis process to modify the pyrolysis volatiles and biochar structure. The effect of pyrolysis reaction temperature (300°C, 400°C, 500°C, and 600°C) and lignin/molten salt mass ratios (3:1, 1:1, 1:3 and 1:5) on the evolution behavior of volatiles and biochar structure was explored. The pyrolysis products were determined using GS-MS, CO 2 adsorption-desorption analyses, SEM, elemental analysis, proximate analysis, Raman, XRD, and TG/DTG analysis. Results indicated that the introduction of molten salt can enhance the lignin depolymerization, leading to the production of phenolic precursors. Moreover, the metal cation (Na + , K + and Li + ) of molten salt can in-situ induce the modification of biochar structure with high porosity. The lower sulfur content in biochar was attributed to the immobilize function of molten salt. The evolution behaviour of volatiles and biochar structure during molten salt-assisted lignin pyrolysis was proposed. This study can serve as a benchmark for the high-value recycling of industrial lignin waste.
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