FUEL
·
2020
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IF 5.578
Rongxuan Li,Jiajian Qiu,Hongquan Chen,Riyang Shu,Ying Chen,Yong Liu,Peng-Fei Liu
Bimetallic catalysts are usually superior to monometallic catalysts due to the synergistic effect of two metal species, and the enhanced adsorption properties by the interaction between two metal species played an important role in catalytic reaction. In this study, the promotion relationship between the adsorption properties and the hydrodeoxygenation (HDO) performances of a bimetallic RuNi/SiO 2 -ZrO 2 catalyst were investigated based on an experimental and modeling study, by comparison to the monometallic catalysts. RuNi catalyst presented a much better performance on guaiacol HDO than Ru and Ni catalysts, with the yield of cyclohexane product close to 100%. Characterization results exhibited a strong interaction between two metal species and an electron transfer from Ru to Ni, which led to a higher spin-up d -band center value of surface atoms and thereby a different adsorption property from the monometallic catalysts. Adsorption property mainly included the adsorption of substrate and the adsorption of hydrogen. The former one is the first step, and the latter one is the second step to trigger the occurrence of HDO reaction. The good adsorption of substrate and the strong adsorption of hydrogen in RuNi catalyst were the crucial factors for its better catalytic HDO performance than the monometallic catalysts. The modeling results by DFT calculation confirmed the experimental results and revealed the promotion mechanism. Moreover, bimetallic RuNi catalyst also showed a good performance on the HDO of other phenolic compounds and raw lignin-oil. This work highlighted the promotion effect of adsorption properties on the HDO reaction.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2021
·Vol. 413
·期 20
·5239-5249
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IF 4.157
Yin Chenhui,Chen Ligang,Niu Na
A sensitive and effective strategy for the detection of cytochrome c (Cyt c) and trypsin was developed using biomass nitrogen-doped carbon quantum dots (N-CQDs) as the fluorescence probe. N-CQDs were synthesized through a one-pot hydrothermal method by utilizing cellulolytic enzyme lignin as the carbon source and ammonia as the solvent and nitrogen source. The obtained N-CQDs had good water solubility and stable optical properties. The introduction of nitrogen increased fluorescence quantum yield (QY) to 8.23%, which was almost four times as high as that before nitrogen doping. The N-CQDs were fabricated as a label-free biosensor to detect Cyt c and trypsin. The fluorescence of N-CQDs was quenched with positively charged Cyt c due to electrostatic induction aggregation and static quenching. However, Cyt c tended to be hydrolyzed into small peptides in the presence of trypsin, which caused fluorescence recovery of the N-CQDs/Cyt c complex. A wide linear response range was achieved for Cyt c within 1–50 μM and the developed N-CQDs/Cyt c complex displayed a linear response for trypsin within 0.09–5.4 U/mL. The detection limits were 0.29 μM for Cyt c and 0.013 U/mL for trypsin, respectively. Furthermore, this assay had been applied to Cyt c and trypsin detection in serum samples with the recoveries in the range of 94.6–98.5% and 95.5–102.0%, respectively. The established method was sensitive, selective, easy to operate, and low cost, which proved its potential application in clinical diagnosis. Graphical abstract
The synthesis and fluorescence mechanism of N-CQDs and the strategy for Cyt c and trypsin detection
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PubMed
高影响因子
Food & Function
·
2021
·Vol. 12
·期 16
·7469-7479
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IF 5.396
Kai Chen,Shengrong Yuan,Dan Wang,Dongming Qi,Fengfeng Chen,Xueqing Qiu
Bacterial infections and multidrug resistance can seriously endanger the health and lives of humans, therefore the development of novel and efficient antibacterial strategies and drugs is urgently needed. Herein, a series of highly biocompatible lysine modified enzymatic hydrolysis lignins (EHL-Lys-x) were synthesized using the Mannich reaction. The sterilizing efficiency of EHL-Lys-2.0 against S. aureus and E. coli at 20 mg mL−1 is 93% and 50%, respectively, which is 26% higher than pure EHL. Quartz crystal microbalance with dissipation monitoring (QCM-D) and atomic force microscopy (AFM) analysis showed that the adsorption and adhesive force between EHL-Lys-x and bacteria increase with the increased amount of grafting of Lys on EHL owing to the increase of the electrostatic interaction between the EHL-Lys-x and bacteria, which results in an improvement in the antimicrobial activity of EHL-Lys-x. Subsequently, EHL-Lys-x combined with alkyl polyglucoside (APG) was used to stabilize the high internal phase emulsion containing curcumin (HIPEs-cur). The dispersed phase fraction of HIPE-cur is 87 vol%, which is the highest internal phase reported to date in the medical research area. The highest residual levels of curcumin in HIPEs are 60-fold, 3-fold and 5-fold compared to that in bulk oil after treatment with UV radiation, thermal emittance and after storage, respectively. The minimum inhibitory concentrations of HIPEs-cur against S. aureus and E. coli were found to be 1.56 and 6.25 mg mL−1, respectively, which are far higher than that of pure EHL-Lys-x. This strategy not only increases the chemical stability and bioavailability of curcumin, but also provides a novel method for the application of lignin in biomedical science.
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PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
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IF 6.669
Chaofeng Zhu,Xiaomeng Dou,Wenzhi Li,Xiaohao Liu,Qingqing Li,Jianru Ma,Qiying Liu,Longlong Ma
A series of non-precious metal/metal oxide nickel-cobalt catalysts was prepared for a highly efficient depolymerization of Kraft lignin (KL) into liquid fuels using amorphous TiZr-oxide (Ti 1−y Zr y O 2 ) as a carrier. The effects of Ni-NiO x , Co-CoO x , NiCo-NiCoO x , NiCoO x and NiCo catalysts supported on amorphous TiZr-oxide carrier on KL depolymerization were investigated. It was found that the NiCo-NiCoO x /Ti 1−y Zr y O 2 catalyst is optimal for converting KL to petroleum ether (PE)-soluble product (mainly composed of monomers and dimers) in an 80.2% high yield at 320 °C for 24 h, with excellent reusability and a low formation of char. Under these conditions, the higher heating value (HHV) increased from 25.11 to 33.89 MJ/kg. A meticulous study on NiCo-NiCoO x /Ti 1−y Zr y O 2 catalysts revealed that the synergistic effect among Lewis acid sites, basic sites and metal active sites played an important role in obtaining high yields of monomers and low rates of char formation during lignin conversion.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Lingxia Zhong,Xiao Zhang,Chenglun Tang,Yanjun Chen,Tao Shen,Chenjie Zhu,Hanjie Ying
Hydrazine hydrate and organosolv synergetic pretreatment of corn stover was developed. With the aid of alkaline and reductive hydrazine hydrate, a high delignification rate (77.94%) and total sugar yield of 90.27% (96.60% glucose, 78.82% xylose) based on the pulp could be obtained using hydrazine hydrate (10 mmol/g corn stover) and aqueous ethanol (60 vt%) as the solvent system. Analysis techniques such as FT-IR, SEM, XRD, and NMR were employed to characterize the structure and property changes of stock before and after pretreatment to evaluate the effect of hydrazine hydrate. A mechanism is proposed for the presented system.
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PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2013
·
IF 1.304
Qi SONG,Jiaying CAI,Junjie ZHANG,Weiqiang YU,Feng WANG,Jie XU
Phenethyl phenyl ether (PPE) was selected as a typical lignin model compound and hydrogenated and cleaved over two readily accessible nickel-based catalysts, which could be easily separated from the product mixture. The results revealed that the reduction of the nickel catalyst with gaseous hydrogen produced a species capable of achieving higher activity towards C-O-C bond cleavage compared to the Ru/C and Pd/C catalysts. The selectivity of the C-O-C bond cleavage over the Ni/C catalyst was 85%, and higher than the corresponding values in the Ru/C (40%) and Pd/C (69%) systems. Using the carbothermal reduction method for the production of the Ni/C-C catalyst, the conversion and selectivity levels reached 99%, with 40% of the benzene rings in PPE being reserved. In comparison, no benzene ring containing products wer observed over the noble metal catalysts. This difference was attributed to the interaction between the carbon support and the nickel nanoparticles. 摘要 研究了Ni基催化剂上木质素模型化合物苯基苯乙醚中C–O–C键加氢裂解性能. 结果表明, 14;Ni/C催化剂显示出优异的加氢裂解能力, 14;苯基苯乙醚的转化率达到99%以上. Ni/C催化剂的还原方法对裂解选择性有重要影响; 氢气还原制备的Ni/C-H催化剂上, 14;C–O–C键裂解选择性为85%. Ru/C和Pd/C催化剂上裂解选择性分别为40%和69%. 采用碳热还原方法制备的Ni/C-C催化剂, 14;可以实现高选择性加氢和裂解, 14;C–O–C键裂解选择性达到99%以上, 14;其中芳烃化合物收率为44%. 这可能与镍组分和载体碳之间的相互作用有关.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
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IF 5.951
Enmin Zong,Xiaohuan Liu,Lina Liu,Jifu Wang,Pingan Song,Zhongqing Ma,Jie Ding,Shenyuan Fu
Effective utilization of abundant industrial lignin has growingly attracted much attention besides potential environmental issues. Although chemical graft polymerization modification is one facile strategy for extending its applications, it remains an intractable challenge to select a highly efficient initiation system. We herein have attempt to understand the CaCl2–H2O2 system in initiating the graft polymerization of acrylic monomers onto acetic acid lignin (AAL) and biobutanol lignin (BBL). The initiation system is found to be highly efficient and selective, as proved by the successful graft of polyacrylates onto them, and a possible mechanism is also proposed. Thermal analysis shows that the graft modification results in a higher glass transition temperature and higher thermal stability of lignin. The graft modification make both AAL and BBL become more hydrophobic than before modification. Moreover, adding a small amount of lignin-graft-polyacrylate can considerably improve the UV blocking capability in addition to the reinforcing effect on polylactic acid. This work offers a novel, highly effective, and selective free radical initiation system for functionalizing lignin.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Zhongshuai Chang,Jiangdong Dai,Atian Xie,Jinsong He,Ruilong Zhang,Sujun Tian,Yongsheng Yan,Chunxiang Li,Wei Xu,Rong Shao
A novel three-dimensional lignin-based interconnected hierarchical porous carbon (3DLHPC) with very high specific surface areas (2784 m2 g–1) and large pore volumes (1.382 cm3 g–1) was prepared using sodium lignin sulfonate as carbon precursor, via confinement carbonization, etching silica-template, and in situ alkali activation, for fast and super highly efficient removal of sulfamethazine (SMZ) antibiotics from water. By batch adsorption experiments test, 3DLHPC showed a strong adsorption affinity for SMZ with the maximum monolayer adsorption capacity of 869.6 mg g–1 at 308 K. Owing to this well-defined 3D interconnected hierarchical porous structure, the adsorption equilibrium could be reached within 30 min at 298 K. The adsorption mechanism might be involved in van der Waals force, π–π EDA interaction, electronic interaction, and hydrophobic interaction, as well as hydrogen bonding interaction. Meanwhile, it was demonstrated that 3DLHPC exhibited excellent regeneration ability, showing the potential possibility for antibiotic wastewater treatments.
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GREEN CHEMISTRY
·
2025
·
IF 9.2
Weiyu Xia,Lupeng Shao,Chao Wang,Yu Liu,Xianhai Zeng,Feng Xu
Lignocellulose as an appealing renewable carbon resource holds great potential to produce high-value-added products. The implementation of an integrated pretreatment process that enables effective fractionation and targeted valorization is crucial for ensuring the feasibility of future biorefinery scenarios. In this study, a stepwise approach using formic acid (FA)–LiBr molten salt hydrate (LiBr MSH) pretreatment was successfully developed for producing high yields of xylose, glucose, glucan oligomers, and less-condensed lignin from poplar. Results showed that FA pretreatment removed the most hemicellulose, releasing a high yield (71.63%) of xylose at 160 °C for 1 h. Subsequent acidified LiBr MSH pretreatment at 100 °C for 0.5 h resulted in a remarkably high cellulose degradation rate of 84.55%, yielding 41.87% glucose and 42.68% glucan oligomers. Meanwhile, 95.57% purity of lignin with abundant uncondensed moieties (i.e., β-O-4 bonds, Hibbert’s ketones) was obtained. The proposed integrated FA–LiBr MSH pretreatment exhibited great potential as an efficient deconstruction strategy in the current biorefinery scenario.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yun Dou,Elwathig A.M. Hassan,Shoujuan Wang,Magdi E. Gibril,Fangong Kong
In contemporary agriculture, eco-friendly mulching films present a promising alternative to conventional plastic mulching films. However, their potential is constrained by challenges related to limited biodegradation and barrier performance. Addressing these limitations, innovative lignin-carboxylated materials were employed as bio-based crosslinking agents to enhance diverse properties in the fabrication of PVA films. Alkali lignin was modified with diethylenetriaminepentaacetic acid (DTPA) to enhance its chemical reactivity. The abundance of carbonyl groups in modified lignin (Lig-DTPA) plays a significant role in establishing strong compatibility with PVA through covalent bonds. This interaction yielded remarkable enhancements, elevating both tensile strength and tensile modulus by an impressive 50.9 % and 60.1 %, respectively. The introduction of Lig-DTPA at 3 % into the PVA composite films resulted in excellent UV-blocking properties. Moreover, at 3 % ratios, the presence of lignin became visibly dispersed as clear spots across the film, indicating a relatively uniform state within the matrix. The study revealed a direct correlation: as the lignin content increased, the film exhibited heightened water solubility and enhanced biodegradability. The PVA/Lig-DTPA film displays promising potential for utilization as a mulching film material, offering anti-ultraviolet functionality and a high degradation rate. Furthermore, its versatility extends to potential applications in packaging materials, including seedling bowls, transplanting pots, and coating films for transportation purposes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaonuo Xu,Yueli Wen,Yuxuan Zhao,Bin Wang,Maohong Fan,Zhiju Chen,Shiyun Guo,Wei Huang
As the primary byproduct of paper making industry, alkali lignin can lead to biological anoxia and disrupt aquatic ecosystems. Application of it in wastewater treatment can not only realize its high value utilization, but realizing reduction of carbon emission. In this study, a renewable alkali lignin-modified MOFs adsorbent AL@PCN-250 was prepared by in-situ synthesis strategy and was used to adsorb and remove Methylene blue (MB) and Rhodamine B (RhB) from textile wastewater. The effects of adsorbent dosage, pH, contact time, and initial concentration on the adsorption behavior of RhB and MB by AL@PCN-250 were investigated to evaluate its adsorption capacity and reusability. The results showed that the maximum adsorption capacities of AL@PCN-250 for RhB and MB were 299.292 mg g −1 and 209.260 mg g −1 , respectively. The Sips models fitted the adsorption isotherms well, indicating that the adsorption sites on the surface of AL@PCN-250 are heterogeneous, with varying affinities for the adsorbates. Notably, after six cycles, the removal efficiency of AL@PCN-250 for the two dyes remained above 80 %. Experimental and theoretical calculations revealed that adsorption mainly involved hydrogen bonding, Van der Waals’ force, π-π interactions, and electrostatic interactions. This study provides new insights into the high-value utilization of lignin and the synthesis of efficient adsorbents.
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GREEN CHEMISTRY
·
2024
·
IF 9.3
Jie Li,Pengpeng Shao,Weijie Geng,Peng Lei,Jing Dong,Yingnan Chi,Changwen Hu
The oxidative depolymerization of β-O-4 linkages into value-added aromatic chemicals is of great importance for lignin valorization. However, achieving highly selective and rapid cleavage of β-O-4 linkages under mild conditions remains a challenge. Herein, cobalt–cobalt oxides (Co-CoOx) supported on N-doped carbon (CoMA/C900) combined with a green and recyclable base K7HNb6O19 (KNb6) have shown remarkable activity for the one-step oxidative cleavage of lignin β-O-4 linkages. Under relatively mild conditions (100 °C, 0.2 MPa O2), a lignin β-O-4 alcohol model compound was almost completely converted within 3 h, affording a narrow product distribution of phenol (yield: 99%) and methyl benzoate (yield: 98%). Based on the control experiments, kinetic study, and spectroscopic analysis, a synergistic oxidative cleavage mechanism was proposed: CoMA/C900 activates molecular oxygen to form a superoxide radical, while basic KNb6 promotes deprotonation of secondary alcohol, and they synergistically catalyze the oxidation of β-O-4 alcohol and the rapid cleavage of Cβ–O and Cα–Cβ bonds. During the reaction, the oxidation of β-O-4 alcohol to β-O-4 ketone is the rate-determining step, while the cleavage of PP-one to phenol and methyl benzoate can be completed within 15 min. Moreover, the CoMA/C900–KNb6 catalyst is recyclable at least three times and highly active for the oxidative cleavages of other lignin models and organosolv birch lignin.
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