POLYMER TESTING
·
2024
·
IF 5
Yuet Cheng,Zheng Pan,Yuntao Lin,Yuling Chen,Xiaolian Li,Hongyu Yang,Yuehong Shen
Artificial materials for the potential treatment of bone defects are very trendy in such research fields. To investigate a hydrogel scaffold with better mechanical strength and osteoinductivity is always a challenge since brittle and soft properties are always the problems in traditional hydrogels. In our study, a novel gelatin/chitosan hydrogel crosslinked by a double network filled with lignin and calcium silicate is fabricated. Enhancements of mechanical strength, low swelling ratio, and improvement in osteoinductivity were achieved in this composite double network hydrogels. The results revealed that lignin was a key factor in raising the compressive strength and stability of the hydrogel because more hydrogen bonds were formed between lignin and the crosslinking network. Even after swelling equilibrium, the compressive strength remained almost unchanged. In addition, the hydrogel groups with a higher ratio of lignin also had lower cytotoxicity and improved osteoinductivity of pre-osteoblasts while the increasing concentration of calcium silicate progressively weakened these performances. Therefore, the gelatin/chitosan double network hydrogel reinforced by lignin would be a potential bone tissue-engineered artificial material.
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高影响因子
Polymer Chemistry
·
2024
·
IF 4.1
Quan Yan,Bailiang Xue,Tonghe Zhang,Wenliang Wang,Xinping Li,Xiaojun Shen,Lulu Ning,Xianzhi Meng,Wei Zhao
The star–star coupling is often regarded as an undesirable side reaction in in the synthesis of star polymers. To mitigate this issue, strategies such as operating at low temperatures, maintaining low monomer concentrations, and limiting monomer conversion are typically employed, albeit at the cost of reduced synthetic efficiency in producing the desired polymer materials. In this study, we propose a novel approach to harness this side reaction for the creation of a lignin-containing, sustainable, and solvent-resistant dynamic dual network using a one-pot synthesis strategy. Initially, a lignin-based macroinitiator with low polydispersity index (PDI) was synthesized to facilitate the precise formation of well-defined star polymers functionalized with epoxy groups. Subsequent to this, the first network, composed of star-shaped lignin-grafted copolymers, was successfully established through the utilization of the free radical bimolecular termination reaction. Following this, the second dynamic crosslinked network was formed via vitrimer chemistry between epoxy and carboxylic acid. The resulting dynamic dual network, accessible through a straightforward one-pot method, exhibited excellent reprocessability and solvent resistance, rendering it suitable for applications as high-performance adhesives. This study introduces a novel strategy for the synthesis of dynamic dual networks based on star-shaped lignin-grafted copolymers, offering promising prospects for the advancement of sustainable biomaterial synthesis.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhaohui Zhang,Jun Xu,Junxian Xie,Ziyong Zhou,Shiyun Zhu,Jun Li,Wei Zhang,Kefu Chen
This work revealed the reaction characteristics in the delignification process of eucalyptus slabs catalyzed by acidic deep eutectic solvent (benzyltriethylammonium chloride/formic acid) from the perspective of heterogeneous reactions. The limitation of internal diffusion on delignification process cannot be ignored. Afterwards, a kinetic model based on cell wall structure was proposed to describe the relationship between the delignification degree and reaction conditions, and it also hold excellent predictive ability for lignin removal, carbohydrate retention and solid residue yield. Compared with other reported kinetic models, this novel model not only took into account all operational parameters of reaction process, but also can be applied to the entire reaction process without the need for segmentation. Besides, an essential requirement based on the developed model was a 44.40 wt% formic acid concentration and a temperature of 130 °C, when the purpose of DES treatment was pulping. Generally, this work could provide guidance on process adjustments and product quality control during the DES processing.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fanjun Yu,Zhichen Ba,Zhizun Gao,Yonggui Wang,Yanjun Xie,Haigang Wang,Zhe Qiu,Zefang Xiao
The development of effective and eco-friendly wood-based functional composites is crucial for maximizing the value of forest resources. In this paper, we propose a novel method for preparing an aqueous-phase flame retardant (MPUC) using carboxymethylation alkali lignin, phytic acid, and melamine-urea-glyoxal resin. This approach aims to manufacture modified wood (MW/MPUC) with exceptional flame-retardant and smoke-suppressing properties. The results from the cone calorimeter test indicate that the modified wood achieved a remarkable reduction of up to 56.8 % in total heat release and an impressive 92.3 % decrease in total smoke production. Furthermore, the limiting oxygen index increased significantly from 23.6 % (natural wood) to 41.5 % (MW/MPUC-2). Notably, all modified wood successfully passed the V-1 test for UL-94 flammability rating. Further, our investigation into the gas-phase products formed during pyrolysis and the condensed-phase system created after combustion has led us to propose potential flame-retardant mechanisms for these flame retardants. Moreover, modified wood had improved mechanical properties and dimensional stability than natural wood. In addition, we extended the application of MPUC-2 flame-retardant to other flammable materials and demonstrated its excellent flame-retardant properties. Thus, the proposed strategy provided a new approach for preparing wood-based flame-retardant composites with lignin-based N-P flame retardants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Suwan Cui,Bingqian Bi,Bohao Qi,Nuo Wang,Hao Liu,Yuan Cheng,Xiaojun Sun,Haoshuai Li,Yiming Li,Jinren Lu,Mutai Bao
During frequent transportation, the marine environment is continuously exposed to significant threats from crude oil and organic solvent leakage. Non-covalent self-assembly of organogelator on the adsorbent matrix to fix non-polar solvents is an efficient and sustainable remediation method. This contribution proposes an organogelator-adsorbent composite by blending aluminum 12-hydroxystearate (Al HSA) and expanded graphite (EG) during lignin-based polyurethane foaming. Al HSA molecule synergizes with EG to modulate the shape (hexagonal), oil retention, mechanical property, and hydrophobicity (water contact angle = 151.3°) of the lignin-based polyurethane foam (LPUF) skeleton. Al HSA-LPUF (OTS-LPUF/EAH) superhydrophobic foam exhibits sorption capacity up to 13.2–53.0 g g −1 in various oils and organic solvents. From the microscopic morphology, the Al HSA on the skeleton self-assembles into spherical nanoclusters driven by hydrogen bonding, realizing the capturing of oils and organic solvents. Even after 20 cycles, the foam still has a high oil/water separation capacity and mechanical performance. OTS-LPUF/EAH also shows improved flame retardancy and a 61 % reduction in total smoke release (TSR) compared to pristine LPUF.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Na Li,Hong-jia Xiang,Teng-gen Hu,Wei-peng Qiu,Yu-xuan Hong,Kai-wen Huang,Xiao-qun Wei,Chuang-zong Guo,Xu-rui Yao,Hong Wang,Peng Wen
Cinnamon essential oil (CEO) has good antibacterial properties, but its volatility, hydrophobicity and bad odor limit its use in food preservation. In this study, a dealkali lignin (DAL) stabilized emulsion loaded with CEO was encapsulated into poly (vinyl alcohol) (PVA) and zein using an emulsion electrospinning technique. With the existence of DAL, the PVA/zein/DAL/CEO nanofibrous film (PVA/zein/DAL/CEO NF) exhibited good antioxidant properties. Moreover, higher antibacterial activity was achieved owing to the nanosized structure and enhanced stability compared to DAL/CEO emulsion and pure CEO. Scanning electron microscopy (SEM) revealed uniformly produced PVA/zein/DAL/CEO NF with an average diameter of 295 nm. The interactions among the nanofibrous film's components were confirmed using attenuated total internal reflectance fourier transform infrared spectroscopy (ATR-FTIR). The nanofibrous film demonstrated a low water vapor permeability (WVP) of 5.07 mm∙g/(m 2 ∙h∙kPa), which was beneficial for reducing moisture transfer from the external environment to the interior of the packaging. Additionally, the PVA/zein/DAL/CEO NF also exhibited a marked enhancement in antioxidant activity, neutralizing 94.54 % of 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicals. The nanofibrous film also demonstrated potent antibacterial effects, with inhibition zones measuring 19.47 mm for Escherichia coli ( E. coli) and 30.37 mm for Staphylococcus aureus ( S. aureus ), respectively. This study provided a reference for preparing a multifunctional electrospun nanofibrous film integrated with CEO as an active packaging material.
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高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Feifan Lu,Jingyu Xu,Zheng Li,Xing Wang,Jinghui Zhou,Yuanhao Wang,Fengzhi Tan
Supercapacitors, known for their long cycle life and high-power density, are pivotal in various industrial and everyday applications. Addressing the dual challenges of green chemistry and the high-value utilization of lignin, this study introduces a novel synthesis process of carbon aerogels. These aerogels incorporate temperature-responsive carbon nanotubes (CNTs), synthesized via a one-pot method using magnesium lignosulfonate as precursor. Notably, the optimized carbon aerogel (AC-600) demonstrates a specific capacitance of 369 F g −1 at a current density of 1 A g −1 and retains 100 % capacitance after 20,000 charge/discharge cycles at 10 A g −1 . It also achieves an energy density of 17.6 Wh kg −1 and a power density of 489.9 W kg −1 . This paper proposes a novel strategy of replacing randomly dispersed carbon nanoparticles with self-synthesized, temperature-responsive CNTs, enhancing the structural integrity of honeycomb lignin-based carbon aerogels. This innovative approach opens new avenues for the efficient use of lignin-based aerogels in energy storage technologies.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xiaochun Liu,Zhiyi Huang,Jianxin Wu,Jianyu Wu,Hongsheng Luo,Yingjuan Sun,Xiaofeng Lin,Wenjing Lin,Guobin Yi
In light of the depletion of petrochemical resources and increase in environmental pollution, there has been a significant focus on utilizing natural biomass, specifically lignin, to develop sustainable and functional materials . This research presents the development of a lignin-based polyurethane (DLPU) with photothermal-responsiveness by incorporating lignin and oxime-carbamate bonds into polyurethane network. The abundant hydrogen bonds between lignin and the polyurethane matrix, along with its cross-linked structure, contribute to DLPU's excellent mechanical strength (30.2 MPa) and toughness (118.7 MJ·m −3 ). Moreover, the excellent photothermal conversion ability of DLPU (54.4 %) activates dynamic reversible behavior of oxime-carbamate bonds and hydrogen bonds, thereby endowing DLPU with exceptional self-healing performance. After 15 min of near-infrared irradiation, DLPU achieves self-healing efficiencies of 96.0 % for tensile strength and 96.3 % for elongation at break. Additionally, DLPU exhibits photocontrolled solid-state plasticity as well as an excellent phototriggered shape-memory effect (70 s), with shape fixity and recovery ratios reaching 98.8 % and 95.3 %, respectively. By exploiting the spatial controllability and photothermal-responsiveness of DLPU, we demonstrate multi-dimensional responsive materials with self-healing and shape-shifting properties. This work not only promotes the development of multi-functional polyurethanes but also provides a pathway for the high-value utilization of lignin.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Yongxi Deng,Kecheng Zhu,Wenjun Jiang,Yixuan Liu,Linyang Xie,Fuhao Liu,Kangjie Yang,Yuanren Jiang,Hanzhong Jia
Sunlight irradiation significantly mediates plant litter’s carbon dynamics and volatile carbon release in semi-arid and arid ecosystems. In this process, carbon loss is controlled by lignin, but the mechanisms of production of CO2 and CH4 during lignin photolysis are ambiguous. In this study, the photomineralization of plant litter and the lignocellulosic component collectively indicate that lignin is a major source of CO2 and CH4 emissions. Characterization and free radical analysis reveal that the production of CO2 is due to the oxidation and ring-opening reaction of the coniferyl alcohol unit, with the subsequent decarboxylation of carboxylic acid as an oxidation product. This reaction involves o-quinone formation by the reactions between O2, superoxide radical (O2·–), and persistent free radicals (PFRs)-bearing lignin. Of this, O2·– contributes to 43.2% of the photogenerated CO2, as a new pathway, derived from the electron transfer from PFRs to O2. Interestingly, photoinduced demethylation of the dimethoxybenzene-type compounds as the photolysis products of lignin results in a never-before-reported CH4 formation chemical route independent of that of O2. This mechanistic insight into the role of lignin in volatile carbon production from the irradiative plant litter will contribute to a deeper understanding of carbon balance in water-limited ecosystems.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Si-Meng Chen,Ling-Hua Xu,Chen Zhang,Bo Wang,Jia-Long Wen,Tong-Qi Yuan
Bamboo, as a natural and sustainable biomass materials has garnered significant attention due to its wide distribution, rapid growth, and considerable economic value. However, bamboo is composed of fibers (F) and parenchyma (P) cells with different anatomical structures and chemical compositions, which present challenges for efficient deconstruction and high-value conversion. Herein, we used microwave-assisted maleic acid (MA) treatment to effectively deconstruct the main components of different bamboo tissues (bamboo powder, F and P), further achieved the preparation of lignin-containing cellulose nanofibrils (LCNFs)-based separators and lignin-based electrode materials. Then, their differences in physicochemical properties and application performance were comprehensively analyzed and compared. The results showed that the prepared LCNFs separators exhibited excellent mechanical strength and stable thermal properties. Specially, the LCNFs separator prepared from bamboo powder (B-LCNF-S) had the highest diameter size (15.7 ± 1.8 nm), porosity (69 %), and electrolyte absorption rate (296 %), which effectively promoted the ion transport. In addition, the lignin-based carbon materials derived from F exhibited the highest specific surface area (1373.31 m 2 g −1 ) and total pore volume (0.99 cm 3 g −1 ), and specific capacity. Finally, LCNFs separators and the corresponding lignin-based electrodes were further assembled into symmetrical supercapacitors, which showed significant differences in electrochemical performance. This study provides valuable insights into the efficient deconstruction and targeted conversion of different bamboo tissues, offering a pathway to harness bamboo's unique structural and chemical properties for advanced energy storage applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 47
·57822-57831
·
IF 0
Liu Yifan,Xu Zhuangqin,He Yuting,Liu Minghua,Lin Chunxiang,Lv Yuancai
A synergistic photocatalytic system based on Fe-based perovskite with persulfate was constructed for alkali lignin (AL) degradation in pulp and paper wastewater. The degradation performance and mechanism on AL were carried out under ambient temperature and pressure, accompanied by visible light irradiation. The results showed that the synergistic photocatalytic system exhibited much better performance on AL degradation than the single catalytic system. The degradation efficiency reached 73.5% under the optimal conditions and was constant at around 65% over the pH range from 2 to 8. A significant escalation of the AL degradation was observed at pH 10, reaching 80.1%. The photogenerated holes, 1 O 2 and SO 4 − ·, generated by the system were involved in the degradation, and the holes played a dominant role. During the degradation process, the efficient promotion of cleavage events in lignin methoxy, β -O-4 bond, and benzene ring was observed. Consequently, the depolymerization process led to the generation of high-value compounds, namely p -hydroxybenzaldehyde and vanillin. Remarkably, the yields of the high-value compounds in the synergistic photocatalytic system were five times larger than those in the control. This study offered a viable method to activate persulfate for alkali lignin degradation and to achieve a mutually beneficial strategy for wastewater treatment and recycling.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xu Fu,Tianyou Mao,Ying Wang,Ligang Wei,Jian Sun,Na Liu,Qingda An,Ling-Ping Xiao,Guolin Shao
Magnetic lignin nanoparticles (MLNs) were prepared by inducing their self-assembly through lignin regeneration in the [ N -methyl-2-pyrrolidone][C1–C4 carboxylic acid] ionic liquids ([NMP]ILs), which are low-cost protic ionic liquid. [NMP]ILs are self-assembling solvent that can enhance the adsorption capacity of MLNs to a greater degree than tetrahydrofuran or H 2 O. Additionally, the anion types of [NMP]IL greatly influence the physiochemical properties of MLNs. The MLNs prepared through self-assembly with [NMP][formate] (MLN/[NMP][For]) exhibited a higher maximum adsorption capacity (134.53 mg/g) than the [NMP]ILs of C2–C4 carboxylate anions. MLN/[NMP][For] demonstrated stable adsorption within a pH range of 6–10 or at high salt concentrations (0.01–0.5 mol/L), retaining over 80 % of its regeneration efficiency after 5 cycles. In addition, MLN/[NMP][For] selectively removed cationic dyes in mixed binary anionic–cationic dye solutions. This work demonstrated the feasibility of preparing magnetic biosorbents with good selectivity and stability though regeneration and by adjusting the anions of ionic liquids.
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