INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Hongxi Zhang,Zhongke Li,Shuyu Tang,Xiande Yang,Meng li,Jing Yang,Liang Wei
This study examines the use of tetrabutylammonium tetrafluoroborate (TBABF 4 ) as a catalyst for the depolymerization of lignin and its model compound without the addition of oxidants. The impact of electrolytes, reaction times, and solvents on the cleavage of the α-O-4 bond in lignin is investigated. The experimental setup includes specific conditions such as the use of carbon cloth (CC) as the counter electrode and a platinum plate as the working electrode. The TBABF 4 catalyst effectively cleaved the α-O-4 bond in the lignin model molecule with notable selectivity and minimal formation of by-products, resulting in a substantial conversion rate of benzyl phenyl ether (95.7 %) and a high yield of benzaldehyde dimethyl aceta (92.4 %) under specific conditions. This investigation showcases a mild electrochemical catalytic depolymerization approach for lignin model molecules at ambient temperature, thereby presenting novel avenues for further exploration in the field.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Yutong He,Shaochao Sun,Xinxu Zhang,Ying Xu,Chen Zhang,Changyou Shao,Jun Yang,Jialong Wen
Hydrogel holds great promise as a strain sensor for flexible electronics. However, traditional hydrogel polymerization processes are hindered by extensive time and energy demands. Additionally, the inadequate adhesion of hydrogel sensors to human skin in extreme conditions often results in signal instability and inaccuracy. To address these challenges, herein, a novel lignin-assisted self-catalytic system (lignin-Fe3+) has been developed to rapidly fabricate self-adhesive and antifreezing multifunctional zwitterionic hydrogels (L-Fe@HE-AA/DMAPS hydrogels) in a water (H2O)–ethylene glycol (EG) solution. The incorporation of EG and zwitterionic [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide (DMAPS) endows the hydrogels with remarkable anti-freezing property over a wide temperature range from −60 to 60 °C, enhanced non-drying properties (73.7% retention), excellent self-adhesion (110.0 ± 3.1 kPa on paper), and excellent mechanical properties (236.15 kPa fracture stress, 556.8% fracture elongation). Leveraging the comprehensive integration of these properties, the zwitterionic hydrogels were assembled as strain sensors, exhibiting high sensitivity (Gauge factor = 6.044), fast response (198 ms), and impressive signal stability. The design of L-Fe@HE-AA/DMAPS hydrogels via a lignin-Fe3+ self-catalytic system and zwitterionic DMAPS presents a promising strategy for practical applications in skin strain sensors.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Nan Pan,Xueru Sheng,Ruisen Shi,Haiyuan Jia,Jian Zhang,Na Li,Haiqiang Shi,Bing Wang,Qingwei Ping
Transparent wood (TW) has attracted much attention in the field of energy saving building structural materials because of its high light transmittance, good thermal insulation performance and good toughness. However, the polymeric resins used in the present study to impregnate lignin-based wood templates are usually derived from petroleum-based chemical resources, which pose a fatal threat to human beings both in terms of consuming large amounts of resources and causing environmental pollution problems. It is therefore important to develop alternatives to petroleum-derived chemicals in renewable natural resources . Here, we report a green and sustainable TW production process based on the bio-recycling concept. Lignin-based sustainable resin (LSR) was prepared from waste lignin produced during delignification by polymerization of guaiacol. At the same time, according to FT-IR and NMR data analysis combined with previous studies, the synthesis mechanism of LSR was proposed, and this result provided a reference for bio-based resins made from biomass materials. The prepared lignin-based sustainable transparent wood (LSTW) has good light transmittance and good dimensional stability. In addition, the LSTW also shows good thermal insulation and indoor temperature regulation capabilities compared with the common glass.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zhu Shan,Bo Jiang,Peng Wang,Wenjuan Wu,Yongcan Jin
Bacterial infections pose a significant threat to global public health, demanding innovative solutions in biomedical field. Lignin is a naturally abundant polyphenol-rich polymer, offer promising potential to fabricate advance biomaterials for biomedical applications. Hence, a composite hydrogel with antimicrobial and antioxidant activities based on the development of dynamic covalent bonds among sodium alginate, lignin and epigallocatechin-3-gallate (EGCG) was designed. Lignin provides structural integrity to hydrogel backbone as well as released synergistically with the drug. This synergistic effect of the pH-responsive controlled release of both EGCG and lignin improved the releasing ability and bioactivity of the hydrogels. In in vitro antimicrobial experiments, the addition of 3.08 wt% lignin significantly enhanced bactericidal efficacy against Escherichia coli and Staphylococcus aureus , raising the killing rate from 20 % to over 96 %. The dynamic borate bond allows hydrogel network to repair itself when it is disrupted. Its self-healing ability, pH-responsive drug delivery, biocompatibility and strong antimicrobial and antioxidant effects make it a promising candidate for chronic wound management. This lignin-based hydrogel marks a significant innovation in sustainable, multifunctional biomedical materials.
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PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Zhiqin Li,Zongxuan Li,Meng Wu,Zegang Qiu,Yanan Zhu,Riguang Zhang
It is highly significant to develop effective catalysts made from non-precious metals for the hydrodeoxygenation (HDO) process of eugenol to propylcyclohexane. A triazine polymer (PAF-53) was employed as a template to synthesize a highly potential Co/NC-T (nitrogen-doped carbon modified by template) catalyst through one-pot pyrolysis method, aiming to facilitate the HDO reaction of eugenol. The results of the characterization indicated that Co nanoparticles (NPs) were incorporated within the structure of nitrogen-doped carbon. Adding the suitable quantity of PAF-53 could improve the distribution of Co NPs, increase the specific area and average pore diameter, and facilitate the generation of numerous carbon nanotubes that are sparse and porous. Furthermore, the incorporation of PAF-53 improved the interaction between Co and nitrogen-doped carbon, and endowed Co/NC-T with high mobile electrons. As revealed by density functional theory (DFT) calculations, the adsorption of eugenol molecules was obviously enhanced, and the parallel adsorption configuration was remarkably favorable. The conversion of eugenol over Co/NC-T-1:4 reached 100% and the selectivity of propylcyclohexane reached 98.4%, at 300 °C, 3 MPa H 2 and a liquid hourly space velocity of 12 h −1 . Moreover, the Co/NC-T-1:4 catalyst exhibited remarkable durability and scalability during the HDO process of eugenol.
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GREEN CHEMISTRY
·
2025
·
IF 9.2
Xinjun He,Mengqiao Gao,Fukun Li,Zhiyang Tang,Jie Qu,Jinxing Long,Qiang Zeng,Xuehui Li
Catalytic hydrogenolysis of lignin has attracted steady attentions in regard of producing high-value aromatic chemicals from the renewable resource and achieving the “carbon neutrality” goal. However, current techniques for lignin hydrogenolysis are highly challengeable due to the necessity of pure H2 and relatively low yields in monomers. In this work, a novel and efficient approach has been proposed for the conversion of lignin to monophenols under readily available and cost-effective syngas. The results demonstrated that CO has the dramatic promotion on the bagasse lignin hydrogenolysis over commercialized Pd/C at 230 °C for 4 h, the yield of monophenols reaches 357.2 mg/g at 3.0 MPa syngas (CO/H2=2/1), which is approximately 1.7 times of that under pure H2. As evidenced by quantitative 31P NMR analysis, the promoting effects of CO on lignin depolymerization are positively correlated with the content of side-chain hydroxyl groups in lignin. Further investigations on lignin model conversion reveal that CO suppresses the dehydroxylation at Cα-OH, with concomitant enhancement of Cβ-O bond cleavage (increasing from 10% in H₂ to 64% in syngas). This inhibitory effect on side-chain hydroxyls elimination directly correlates with the 1.7-fold increase of monophenol yields observed during catalytic depolymerization. Therefore, this work provides a new insight in lignin depolymerization using industrial catalyst of Pd/C and the cost-effective syngas.
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JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Wenzhe Zhang,Shanshan Dai,Yong Liu,Jie Li,Guozhang Chang,Cuiping Wang,Jian Zhang
The utilization of industrially generated lignin is an important aspect of achieving worldwide carbon neutrality. In this study, Ni/CaO, Ce/CaO and (Ni-Ce)/CaO catalysts were prepared using an impregnation method to improve the production of H 2 -enriched syngas from lignin steam gasification. Results show that the Ni/CaO and Ce/CaO exhibited different effects when applied to steam gasification, the former improved the conversion of solid lignin whereas the latter promoted decomposition of the resulting volatiles. The (Ni-Ce)/CaO catalyst provided a remarkable synergistic effect on production of H 2 -enriched syngas. The mass-based yield of gaseous products and the volume-based proportion of H 2 in these products were respectively 70.8% and 61.1% in the presence of the (Ni-Ce)/CaO catalyst with a Ni-to-Ce molar ratio of 1:0.9. The H 2 yields obtained from this material were found to gradually decrease from 763 to 681 mL/(g lignin) during five repeated uses. This gradual deactivation of the (Ni-Ce)/CaO catalyst was ascribed to both carbon deposition and the formation of CaSO 4 by reactions between sulfur in the lignin ash and the CaO component.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Jinwei Zhao,Cheng Xu,Jiali Pu,Yi Xie,Haodong Guo,Baojie Liu,Chengrong Qin,Shuangquan Yao,Chen Liang
Bamboo is a fast-growing, high-biomass, and mechanically strong renewable resource. It shows great potential in cellulose-based materials and bio-based products. However, its complex tissue structure and unique lignin distribution limit the efficiency and applicability of conventional delignification processes. In this study, a synergistic lignin removal strategy combining high-proportion chlorine dioxide (ClO 2 ) pretreatment with oxygen delignification was developed. Two process sequences, O-D PI and D PI -O, were systematically compared in terms of reaction mechanisms during bamboo fiber lignin removal. Results showed that, in the D PI -O process, ClO 2 preferentially oxidized lignin to form quinone-type intermediates. These intermediates were then effectively degraded in the subsequent oxygen delignification stage. This led to a significantly higher lignin removal rate (84.90 %) and a notable reduction in kappa number (2.49) and AOX generation (0.267 kg/t pulp). Multidimensional characterization using 2D HSQC NMR and 31 P NMR confirmed more complete cleavage of S/G units and β-O-4 linkages in the D PI -O system. The carboxyl group content of residual lignin increased significantly to 1.194 mmol/g, revealing the critical role of quinone intermediates in deep oxidative degradation. Kinetic studies further showed that the lignin removal rate was highly sensitive to alkali concentration (a 1 = 0.6012), especially under low oxygen pressure. In low-alkali environments, oxygen pressure became more influential (b 1 = 0.1382). This study elucidates the reaction pathway and key controlling parameters of oxygen-assisted, high-proportion ClO 2 delignification. It provides both theoretical and practical support for efficient lignin degradation and high-purity cellulose fiber production.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Pei-Ru Zhou,Yu Chai,Jia-Tong Chen,Xiao-Ping Zheng,Yan-Zhen Zheng
The valorization of agricultural waste is critical for sustainable development, yet challenges persist in obtaining light-colored lignin with preserved structural integrity. In this study, an innovative one-step pretreatment strategy integrating deep eutectic solvents (DESs) with H 2 O 2 was developed to extract light-colored lignin directly from tea stem waste. The DES-H 2 O 2 system enabled the selective dissociation of lignin–carbohydrate complexes while preserving the fundamental aromatic structure of lignin. By varying the H 2 O 2 dosage, significant improvements in lignin decolorization were achieved, as evidenced by a marked reduction in the color difference relative to milled wood lignin (MWL). Comprehensive characterization using FTIR, GPC, Zeta potential, 31 P NMR, 2D-HSQC NMR, and XPS revealed that H 2 O 2 -induced oxidation not only facilitated the conversion of non-conjugated carbonyls into conjugated structures but also induced molecular depolymerization, reduced particle size and hydrogen-bond, and enhanced surface electronegativity. These modifications contributed to decreased chromophore efficiency and suppressed aggregation, ultimately yielding lignin with improved optical properties. Furthermore, incorporation of the light-colored lignin into a commercially available base cream demonstrated its potential as a sustainable UV-shielding agent, achieving a sun protection factor (SPF) exceeding 50 at optimal lignin concentrations. This work provides a promising green pathway for the high-value utilization of agricultural waste and lays the groundwork for the development of environmentally friendly, high-performance natural UV-protection products.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Ge-liang Xie,Yang Cao,Sheng-ren Li,Qian-qian Lu,Wei Chen,Shuai Gao,Wei Qiu,Chao He,Zhen Fang,Lujiang Xu
Lignin valorization through catalytic upgrading to nitrogen-containing aromatics represents a critical pathway for sustainable chemical production. Using vanillin, a key lignin depolymerization product, as a platform molecule, we demonstrate the first integrated strategy combining cyanide-free cyanation and gas-phase hydrodeoxygenation (HDO) to synthesize hydroxybenzonitriles (HBNs). Bond dissociation energy (BDE) analysis revealed the cyano group’s selective retention (C≡N: 136.21 kcal/mol vs C–O: 62.44–116.17 kcal/mol), guiding targeted HDO pathway design. A green H2O/HCOOH system achieved 99.2 mol % vanillonitrile yield under mild conditions (85 °C, 12 h), surpassing conventional DMF-based methods. Engineered Mo/TiO2 catalysts with triple functional sites (oxygen vacancies, suitable content of Mo5+, strong metal–support interaction) achieved 57.6% HBN yield in continuous gas-phase HDO, outperforming Mo/ZrO2. The catalyst retained 90% of its initial activity over eight cycles due to enhanced metal–support interactions. This work establishes a sustainable route for lignin-to-chemical conversion, advancing catalyst design principles for biomass upgrading.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ding Jiang,Hongping Li,Xiaoxue Cheng,Pietro Bartocci,Arman Amani Babadi,Minggao Xu,Yang Pan,Bin Cao,Osvalda Senneca,Shuang Wang
Biomass fast pyrolysis offers a promising route to biofuels and chemicals, yet its byproduct, biochar, remains an underutilized catalyst. Using vanillyl alcohol as a lignin model, we tailored biochar surfaces via KOH, CO₂, and HNO₃ activation. Characterization by XRD, XPS, FTIR, Raman, and EPR unveiled synergy between carbon-centered radicals and hydroxyl groups driving catalysis. Catalytic pyrolysis boosted monophenol selectivity to 35.4 % through defect-mediated radical stabilization. In situ SVUV-PIMS identified 4-methyl-2-hydroxyphenoxyl as a key intermediate, while non-catalytic pyrolysis favored methoxy derivatives (68.2 %), with catalytic reactions yielding methyl-phenols. DFT calculations revealed cooperative catalysis on zigzag edges: carbon radicals stabilize intermediates (−29.8 kcal/mol adsorption energy), and hydroxyls enable hydrogen transfer (ΔG‡ = 41.1 kcal/mol). This synergy informs a sustainable biochar catalyst design, harnessing zigzag edge activity for efficient phenolic production in biorefining.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 32
·e55752
·
IF 2.7
Yihao Zhang,Yingnan Sun,Haiming Li,Haiqiang Shi,Meihong Niu,Xing Wang,Tingting Chu,Zhiwei Wang,Yanzhu Guo
In this work, two types of cationic lignin-based adsorbents (AL-METAC and AL-GTA) were prepared through free radical polymerization or etherification reaction of alkali lignin with 2,3-epoxypropyl-3-trimethylammonium chloride or methylacrylloxyethyl trimethyl ammonium chloride (METAC). The contents of quaternary ammonium groups in the adsorbents were adjusted by changing the dosages of 2,3-epoxypropyl-3-trimethylammonium chloride and METAC to fabricate the adsorbents with excellent adsorption capacity. The structures, aqueous solubility, and physical properties of adsorbents were analyzed. Meanwhile, the effects of adsorbents dosage, pH value of solution, temperature, and ionic strength on the adsorption capacity of adsorbents were also analyzed. These two types of adsorbents exhibited outstanding affinity for phosphate, with a maximum removal efficiency of 51.8 and 73.2 mg/g, respectively. The adsorption processes followed pseudo-second-order and Langmuir models well. In addition, the AL-GTA exhibited higher removal efficiency than AL-METAC. Moreover, the AL-METAC and AL-GTA still retained 69.7% and 69.0% adsorption capacity after four times regeneration. The fabricated lignin-based adsorbents have potential applications in the removal of phosphate from wastewater, which would promote the high-value application of lignin.
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危险品化学品经营许可证（带存储）