FUEL
·
2020
·
IF 5.578
Xiaohua Zhang,Weikun Jiang,Hao Ma,Shubin Wu
This study investigated the relationship between the formation of oligomers and monophenols and lignin structure during pyrolysis regarding two technical lignins from alkali lignin (AL) and corn cob hydrolysis residue lignin (CHRL). The results showed that the molecular weight distribution and inter-unit linkages varied substantially between AL and CHRL, resulting in profound differences in the content of monophenols and oligomers and their distributions in pyrolysis oil (PO). Thereinto, CHRL-PO containing higher monomers content (20.48%) and lower oligomers content (14.31%) relative to AL-PO (5.02%, 22.4%). This was attributed to the higher proportion of guaiacyl (G) units existed in AL, which tended to form oligomers and char. Additionally, the formation pathways of main monophenols from two POs were also different. In light of these findings, the thermal cracking behavior of lignin was closely bound up with its structural features. On one hand, the formation pathways of lignin-derived dimers and tetramers in PO originated from the breaking of a large amount of β-O-4, α-O-4 and C β -C γ bonds during pyrolysis process. Meanwhile, the interconversion relationship between oligomers and monophenols was also existed. Polycyclic aromatic hydrocarbon (PAH) derivatives, on the other hand, were formed by the continuous growth of smaller free radicals because of the evolutionary components (such as phenols, syringols) could form oxygen-related free radicals during the secondary reaction process. Overall, this work provided the research basis and theoretical guidance for balancing the production of oligomers and monophenols through the selection of specific lignin feedstock.
研究领域:
生物质能
·
化学工程
·
林业科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2022
·Vol. 194
·期 11
·5220-5235
·
IF 3.094
Qiu Weihua,Liu Jinru
Bio-depolymerized the lignin macromolecules into low molecular lignin-derived aromatic compounds satisfies the requirement for carbon dioxide peaking and is also one of the important ways to realize lignin valorization. Coriolopsis trogii is a kind of less reported lignin-degrading white-rot fungus. The degradability of a self-isolated C. trogii TS01 on industrial lignins, including enzymatic hydrolysis lignin (EHL) and Kraft lignin (KL), was investigated in this paper. The results indicated that EHL could be used as an efficient carbon source to promote the cell growth and ligninolytic enzyme secretion of C. trogii TS01. Compared with using 2% glucose as carbon source, 1% EHL plus 1% glucose would increase the maximum cell dry weight, laccase activity, and manganese-dependent peroxidase activity of C. trogii TS01 by 24.8%, 164.1%, and 200%, respectively. However, the cell growth and ligninolytic enzyme secretion would be significantly inhibited in the case of 1% KL plus 1% glucose used as carbon source. As a result, at the 12th day of fermentation, the degradation rates of EHL and KL were 50.6% and 5.7%, respectively. The UV and FTIR analysis indicated that after been fermented by C. trogii TS01, S-unit content in EHL was decreased by 12.5% but G-unit content was increased by 53.7%. In conclusion, the research of this paper will provide a promising solution for the valorization of enzymatic hydrolysis lignin since the high biodegradation rate of lignin and high activity of ligninolytic enzymes could be achieved simultaneously.
研究领域:
微生物学
·
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Bioresources and Bioproducts
·
2023
·
IF 0
Zhaoxian Xu,Jie Li,Pingping Li,Chenggu Cai,Sitong Chen,Boning Ding,Shuangmei Liu,Mianshen Ge,Mingjie Jin
Low lignin solubility in aqueous solution is one of the major bottlenecks for lignin biodegradation and bioconversion. Alkaline solution contributes to improving lignin solubility, whereas most microbes can not survive in alkaline conditions. Herein, lignin dissolution behaviors in different pH solutions were systematically investigated, which indicated that solution pH above 10.5 contributed to high solubility of alkali lignin. To match with alkaline lignin aqueous system, several alkali-tolerant ligninolytic bacteria were isolated, most of which are distinct to previously reported ones. Then, the ligninolytic capabilities of these isolates were assessed in different pH conditions by determining their assimilation on alkali lignin, lignin-derived monomers and dimers, their decolorization capabilities, and their lignin peroxidase activities. Thereafter, the underlying ligninolytic and alkali-tolerant mechanisms of Sutcliffiella sp. NC1, an alkalophilic bacterium, was analyzed on the basis of its genome information. The results not only provide valuable information for lignin biodegradation and lignin valorization, but also expand knowledge on alkali-tolerant bacteria.
研究领域:
微生物学
·
生物技术
·
环境科学
✓ 已验证
DOI
Polymers
·
2018
·Vol. 10
·期 9
·967
·
IF 2.935
Si Gao,Ji Zhao,Xing Wang,Yanzhu Guo,Ying Han,Jinghui Zhou
This study focused on the structural differences of lignin after pyridine–acetic acid–water (PAW) and dioxane–acidic water (DAW) purification processes. These structural differences included the S/G ratio, condensed structure, weight-average (MW) molecular weights, β-O-4 linkages and sugar content. The chemical structure of the isolated crude lignin (CL), PAW purified lignin (PPL) and DAW purified lignin (DPL) was elucidated using quantitative13C NMR, 2D-HSQC NMR spectra, thermogravimetric analysis (TGA), gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR). The results showed that the PPL fractions contain fewer condensed structures, higher S/G ratios, more β-O-4 linkages, higher average MWand lower thermal degradation properties compared to the CL and DPL fractions. Furthermore, the PAW process was more selective in removing condensed units and enriching S-type lignin from CL compared to the DAW process. These results provide valuable information for understanding which purification process is more suitable to be applied for lignin.Keywords:lignin purification;structural recognition;condensed lignin;S/G ratio
研究领域:
植物化学
·
生物质能源
✓ 已验证
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Bing Yan,Kunlan Li,Ligang Wei,Yingchong Ma,Guolin Shao,Deyang Zhao,Wenying Wan,Lili Song
The treatment of enzymatically hydrolyzed lignin (EHL) in dialkylimidazolium-based ionic liquid (IL)–water mixtures (50–100 wt% IL content) was investigated at 150 °C for 3 h. pH, IL type, and IL content were found to greatly influence the degradation of lignin and the structure of regenerated lignin. 1-Butyl-3-methylimidazolium methylsulfonate–water mixtures with low pH facilitated lignin depolymerization but destroyed the regenerated lignin substructure. Regenerated lignin with low molecular weight and narrow polydispersity index (2.2–7.7) was obtained using a 1-butyl-3-methylimidazolium acetate-based system. Water addition inhibited lignin depolymerization at 50–100 wt% IL content, except for 70 wt% 1-butyl-3-methylimidazolium chloride–water mixture. Compared with pure IL treatment, obvious differences were observed in the breakdown of inter-unit linkages and ratio of syringyl to guaiacyl units in regenerated lignin with IL–water treatment.
研究领域:
生物化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Jiahai Yu,Xiong Yang,Lei Xiao,Shizhu Song,Jiayue Chen,Liwen Cao,Min Xia,Pan Wu,Kewu Pi,Guohong Qiu
Lignin derived from papermaking black liquor is an abundant and economical biochar precursor, however, its direct pyrolysis products often exhibit limited adsorption capacity for heavy metal ions due to their inherent poor pore structure. In order to improve the adsorption ability of lignin-based biochar, an electrochemical adsorption strategy was used to significantly enhance its removal performance for heavy metal in this study. Using alkali lignin and sodium lignosulfonate as precursors, biochar electrodes were prepared via direct pyrolysis. Their physical and chemical properties were comprehensively compared, and their selective electrochemical adsorption efficiency for Cd 2+ in high-salt wastewater was systematically evaluated. The effect of the applied voltage was investigated, and 1.2 V was determined as the optimal operating voltage within the tested range. Under this condition, alkali lignin biochar (AL-BC) exhibited a maximum electrochemical adsorption capacity of 409.3 mg g −1 , significantly exceeding the 82.8 mg g −1 observed for sodium lignosulfonate biochar (LS-BC). The electrochemical process increased the adsorption capacity of AL-BC and LS-BC by about 6.95 and 3.53 times, respectively. Quantitative analysis of electrochemical adsorption mechanisms revealed that the selective capture of Cd 2+ on AL-BC was primarily governed by chemical adsorption mechanisms. Surface precipitation was the dominant contributor (67.1 %), followed by ion exchange (26.2 %), whereas EDLs adsorption (4.8 %) and surface complexation (2.0 %) played minor roles. This study revealed the potential of lignin biochar as a highly efficient and selective electrochemical adsorbent for heavy metal ions in wastewater, providing a new strategy for the high-value utilization of lignin.
研究领域:
环境科学
·
材料科学
·
电化学
·
水处理
·
吸附技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Fei Ge,Lei Zhong,Xiaohui Yang,Minghao Zhou
In order to improve the flame retardancy of phenolic foam (PF), it is a feasible method to add flame retardants. Due to the similar structure of lignin to phenol, this provides the possibility of developing lignin-based flame retardants to partially replace phenol. In this work, we used kraft lignin as the raw material and prepared oxidized kraft lignin (OL) through the oxidation reaction to increase the carbonyl content in the side chain. Then, a nitrogen and phosphorus lignin-based flame retardant (NP-OL) was prepared by chemical grafting of the side chain with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and pentaethylenehexamine (PEHM), and then nitrogen and phosphorus modified phenolic foam (NPOLPFX) was prepared by partially replacing phenol with NP-OL. The lignin-based flame retardant was then utilized to partially replace phenol for preparing modified phenolic foam. The addition of NP-OL could effectively improve the limiting oxygen index (LOI) and compressive strength of phenolic foam. The LOI and compressive strength of modified phenolic foam (NPOLPF5) with a 5% replacement rate were much higher than those of pure phenolic foam. The cone calorimeter data also showed that NPOLPF5 had good flame retardancy, with significantly lower peak and total heat release rates than PF. This work provides a novel strategy for improving the flame retardancy of phenolic foam and promoting the utilization of lignin.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Lipeng Zhou,Dongting Gao,Yangyang Ma,Hongji Li,Yunlai Su,Xiaomei Yang,Tianliang Lu
Hydrolysis of cellulose to glucose is one of the most important processes for the conversion of biomass to fuels and chemicals. Besides cellulose, lignin is the third of the main components of native lignocellulose . It is essential to understand the role of lignin in the depolymerization process of cellulose using lignocellulose as raw material. Here, the role of lignin was studied by using a lignin dimer model with a β-O-4 linkage and an organsolv lignin as the additive, respectively, for depolymerization of cellulose via oxidation-hydrolysis method. The results showed that both lignin dimer model and organsolv lignin substantially promoted the oxidation of cellulose and increased the yield of glucose. 30.01% yield of glucose was given for microcrystalline cellulose in present of 10% organsolv lignin, compared to 22.64% glucose yield for pure microcrystalline cellulose. Additionally, the mechanism of the promotion effect of lignin on the oxidation of cellulose process was proposed.
研究领域:
生物化学
·
生物质能
✓ 已验证
产品关联
DOI
高影响因子
Royal Society Open Science
·
2019
·Vol. 6
·期 2
·
IF 2.515
Lisheng Shi,Jiayan Ge,Shuangxi Nie,Chengrong Qin,Shuangquan Yao
Adsorbable organic halogens (AOX) are formed in pulp bleaching as a result of the reaction of residual lignin with chlorine dioxide. The natural structure of lignin is very complex and it tends to be damaged by various extraction methods. All the factors can affect the study about the mechanism of AOX formation in the reaction of lignin with chlorine dioxide. Lignin model compounds, with certain structures, can be used to study the role of different lignin structures on AOX formation. The effect of lignin structure on AOX formation was determined by reacting phenolic and non-phenolic lignin model compound with a chlorine dioxide solution. Vanillyl alcohol (VA) and veratryl alcohol (VE) were selected for the phenolic and non-phenolic lignin model compound, respectively. The pattern consumption of lignin model compounds suggests that both VA and VE began reacting with chlorine dioxide within 10 min and then gradually steadied. The volume of AOX produced by VE was significantly higher than that produced by VA for a given initial lignin model compound concentration. In a solution containing a combination of VA and VE in chlorine dioxide, VE was the dominant producer of AOX. This result indicates that the non-phenolic lignin structure was more easily chlorinated, while the phenolic lignin structure was mainly oxidized. In addition, AOX content produced in the combined experiments exceeded the total content of the two separate experiments. It suggested that the combination of phenolic and non-phenolic lignin structure can promote AOX formation.
研究领域:
制浆造纸科学
·
环境化学
·
有机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Bailiang Xue,Yang Yang,Rui Tang,Danwei Xue,Yongchang Sun,Xinping Li
Novel ternary deep eutectic solvents (DESs) were designed to efficiently dissolve the lignin for synthesizing the lignin-containing rigid polyurethane foam (LRPUF). These ternary DESs were constituted by choline chloride (ChCl), two hydrogen bond donors – glycerol (Gly) and polyethylene glycol (PEG-400). The maximum solubility of lignin in the sample DES-2 (ChCl:Gly:PEG-400 = 1:2:2) could up to 66.70 g/100 g solvent at 60 °C due to the hydrogen bonds are the main driving force, which was confirmed by the largest hydrogen bond basicity parameter β value and disappearance of crystalline peak. The main structure of the lignin did not change after dissolution in DES-2. The content of phenolic and total hydroxyl groups of the regenerated lignin increased, with reduction in their average molecular weights and polydispersity, indicating that the dissolution and regeneration of lignin in these ternary DESs can make it more homogeneous. The regenerated lignin was partially replacing for polyols in the LRPUF synthesis, the lignin replacement rate could up to 58.6% with good mechanical properties. The findings add to our understanding for efficient dissolution of lignin in DESs and for synthesizing the highly LRPUF.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Qi Liu,Haonan Zhang,Hao Ren,Huamin Zhai
The use of lignin is limited by its heterogeneity and complexity. This study was processed using different methods to obtain spruce milled wood lignin (SMWL), spruce kraft lignin (SKL), and spruce lignocresol (SLC) for comparative analysis of the structure and antioxidant activity . SMWL has a complete softwood lignin side-chains structure and lignin carbohydrate complexes. SKL contains fewer ether bonds, while more conjugate structures and condensed structures contribute to the color. However, the α-position of the lignin side chain eliminates most of the hydroxyl and ether bonds (β-O-4/α-OH, phenylcoumaran, and dibenzodioxocine structure) and effectively grafts p -cresol in the phase separation reaction. It not only inhibits the self-condensation of lignin, but also forms the 1,1-diarylpropane unit while protecting β-O-4 linkages from not breaking. Importantly, SLC has few conjugate structures that result in the lightest color among all lignin isolated. Besides, SLC has a high yield and contains trace carbohydrates, indicating that the phase separation method can achieve great amounts of purity separated lignin. The antioxidant activity of lignin was evaluated, results show that 85% of the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicals were scavenged at the end of 60 min. Owing to its unique color, structural properties, and continuous antioxidant activity, SLC has the potential to manufacture antioxidant cosmetics.
研究领域:
林产化学与技术
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yuanlong Guo,Juchun Liu,Tianlong He,Tao Wu,Tonghui Xu,Yunqi Li,Haibo Xie
Traditional phenolic resins (PF) are extremely widely applied in industrial and daily life due to their low cost and outstanding adhesion. However, they are also limited by the toxicity of phenol and formaldehyde as well as the petroleum-based origin at the same time. Herein, a comprehensive strategy for the development of formaldehyde-free lignin-based furfural resin (LFR) with dual functions for adhesive and photothermal conversion materials was presented. Firstly, a newly developed phenolated lignin was obtained via the transesterification of 3,4-dihydrocoumarin (DHC) and aliphatic hydroxyl group of lignin under organocatalysis. Then, the phenolated lignin can be regarded as a highly versatile and precise building block polymer for the design and development of LFR. LFR exhibited excellent adhesion performance from 1.12 to 2.75 MPa on various substrates. Additionally, the low-temperature and wet adhesion strength of LFR were also investigated. Different from traditional thermosetting PF, LFR was hot-melt and possessed outstanding photothermal conversion and hydrophobicity properties, which provided the possibility for its use as a photothermal power generation coating and anti/de-icing material. The maximum temperature and output voltage as well as current of LFR-2 coating could reach 154 °C, 310 mV and 43.2 mA via a thermoelectric generator, respectively. Finally, the hydrophobic, smooth and self-cleaning surface of LFR-2 could effectively help melt and remove ice even in a − 20 °C environment, which was beneficial for the utilization of photothermal material in real environment.
研究领域:
材料科学
·
化学工程
·
可再生资源利用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）