PROGRESS IN ORGANIC COATINGS
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2018
·
IF 2.955
Ru Yan,Dalei Yang,Niaona Zhang,Qi Zhao,Baijun Liu,Wei Xiang,Zhaoyan Sun,Rui Xu,Mingyao Zhang,Wei Hu
In this work, lignin based epoxy acrylate (LBEA) oligomer with various percentage of lignin was in situ synthesized with epoxy and acrylic acid. The first step was the etherification between lignin and epoxy to produce lignin based epoxy (LBE), and the second step was the esterification between LBE and acrylic acid to synthesize LBEA. Epoxy value and acid value were measured to determine the reaction conditions of the two steps, respectively. The structure of prepared LBEA was confirmed by Flourier infrared spectroscopy (FTIR) characterization. LBEA coatings were prepared through ultraviolet radiation curing method. The gel content, chemical resistance, mechanical properties and thermal properties of coatings were investigated. It was found that the mechanical properties and chemical resistance were much improved than those of epoxy acrylate (EA) resin with the addition of lignin. Thus, lignin was proved to be a new promising biomaterial which could be applied in biobased EA coatings.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CATALYSIS TODAY
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2020
·
IF 5.825
Jian Zhang,Zerui Su,Zhiyi Wu,Pingzhou Wang,Feng-Shou Xiao
Catalytic hydrogenolysis of lignin to produce arene monomers is promising for efficient utilization of lignocellulose. The acidic carrier supported metal nanoparticles exhibit excellent catalytic performance, while basic carrier was not often used. In this study, a basic hydroxyapatite supported Pt nanoparticles (Pt/HAP-3) were developed for the catalytic hydrogenolysis of alkaline lignin, achieving 15.1 % monomer yield. Characterizations of the catalysts and investigation on the basic sites show that high monomer yield is resulted from the synergy of suitable metal nanoparticles and sufficient basic sites of the carrier. This work might be helpful for preparation of efficient catalysts for the hydrogenolysis of lignin in the future.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 5
·399
·
IF 3.444
Boyu Du,Bingyang Liu,Yingying Yang,Xing Wang,Jinghui Zhou
Obtaining renewable fuels and chemicals from lignin is an important challenge in the use of biomass to achieve sustainability and energy goals. At present, acid-based catalysts for lignin depolymerization are considered to be a potential but challenging way to produce low-molecular-mass aromatic chemicals. The main concerns with the use of Lewis acids and zeolite catalysts are the corrosive nature of the acids, the possible formation of unwanted byproducts, and the possible formation of harsh reaction conditions. We achieved high-yield conversion using phosphotungstic acid (PTA) polyoxometalate catalysts in ethanol/water under different reaction conditions with little formation of bio-char. The monomeric products were mainly composed of various types of aromatic compounds. Our method does not require the use of precious metals and harsh reaction conditions—it only requires relatively mild reaction conditions and homogeneous catalysis—thereby greatly reducing operating costs and increasing the yields. Therefore, this PTA catalyst, which has excellent performance in bulrush lignin catalysis, would be a good alternative to the traditional catalysts used in lignin depolymerization and have wide application in biomass use.Keywords:lignin;catalytic depolymerization;phosphotungstic acid catalyst;β-O-4
研究领域:
可再生能源
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催化
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生物质转化
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化学工程
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产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
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2019
·
IF 4.959
Yiwen Zhang,Miaomiao Jiang,Yuqing Zhang,Qiping Cao,Xing Wang,Ying Han,Guangwei Sun,Yao Li,Jinghui Zhou
Although PVA–chitosan composite hydrogel has excellent biocompatibility and antibacterial ability, its poor mechanical strength limits its application for wound dressings. Furthermore, PVA–chitosan composite hydrogel cannot satisfy the requirements of wound dressing as an environmental conditioner to accelerate wound healing. In this work, a novel lignin–chitosan–PVA composite hydrogel was prepared as wound dressing. The introduction of lignin effectively improved the mechanical strength (tensile stress is up to 46.87 MPa), protein adsorption capacity, and wound environmental regulation ability of the hydrogel. In a murine wound model, the lignin–chitosan–PVA composite hydrogel significantly accelerated wound healing. The developed hydrogel provides new opportunities for highly efficient skin wound care and management.
研究领域:
材料科学
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生物医学工程
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伤口护理
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产品关联
DOI
PubMed
高影响因子
ACS Omega
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2021
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IF 3.512
Ruohan Yang,Xinyu Lu,Xiaoli Gu
Cellulose is the most abundant natural biopolymer material, which has been widely used in film making and food packaging in recent years. However, lignin, a natural bioaromatic material, is always applied as a waste resource due to its low utilization efficiency. In this study, a ZnCl2/CaCl2/cellulose mixed system was used to prepare film materials via a regeneration method. The chemical structure and corresponding properties were characterized. The thermal decomposition process of film materials showed that with an increase of the heating rate, the maximum weight loss temperature gradually shifted to the higher-temperature region. Additionally, the combination of lignin with cellulose as composite films can effectively improve thermal stability. Furthermore, kinetics methods such as Kissing–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), and Friedman were used to calculate the average activation energy (E). This study proposed a facile method for preparing biobased multifunctional composite films using two kinds of naturally renewable materials.
研究领域:
材料科学
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化学工程
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热分析
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产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2014
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IF 5.039
Yantao Wang,Ligang Wei,Kunlan Li,Yingchong Ma,Ningning Ma,Shan Ding,Linlin Wang,Deyang Zhao,Bing Yan,Wenying Wan,Qian Zhang,Xin Wang,Junmei Wang,Hui Li
Lignin dissolution in dialkylimidazolium-based ionic liquid (IL)–water mixtures (40 wt%–100 wt% IL content) at 60 °C was investigated. The IL content and type are found to considerably affect lignin solubility. For the IL–water mixtures except 1-butyl-3-methylimidazolium tetrafluoroborate ([C 4 C 1 im]BF 4 ), the maximum lignin solubility can be achieved at 70 wt% IL content. Lignin solubility in IL–water mixtures with different cations follows the order 1-butyl-3-methylimidazolium ([C 4 C 1 im] + ) > 1-hexyl-3-methylimidazolium ([C 6 C 1 im] + ) > 1-ethyl-3-methylimidazolium ([C 2 C 1 im] + ) > 1-octyl-3-methylimidazolium ([C 8 C 1 im] + ) > 1-butyl-3-ethylimidazolium ([C 4 C 2 im] + ) > 1-butyl-3-propylimidazolium ([C 4 C 3 im] + ). For IL mixtures with different anions, lignin solubility decreases in the following order: methanesulfonate (MeSO 3 − ) > acetate (MeCO 2 − ) > bromide (Br − ) > dibutylphosphate (DBP − ). Evaluation using the theory of Hansen solubility parameter (HSP) is consistent with the experimental results, suggesting that HSP can aid in finding the appropriate range of IL content for IL–water mixtures. However, HSP cannot be used to evaluate the effect of IL type on lignin solubility.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
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2016
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IF 3.698
Yanli Ma,Yajie Sun,Yujie Fu,Guizhen Fang,Xingru Yan,Zhanhu Guo
Supramolecular cross-linked porous lignin based poly (acrylic acid) [LBPAA] was lab-synthesized by copolymerizing lignin grafted N, N'-methylene-bisacrylamide (LM) and acrylic acid . LBPAA successfully acted as a water retention agent with salt resistance and biodegradation for agricultural applications. Lignin was found to improve its swelling behaviors with higher water retention, fast swelling and de-swelling rates. The salt tolerance was stronger in the case of LBPAA (60 PAA/40 LM) [60 wt% PAA/40 wt% LM], i.e., 145.79 g·g −1 higher than PAA at 0.09 mM KCl solution. The effect of ion charges on the LBPAA swelling ratio was greater than that of ionic radius. The weight loss of LBPAA (60 PAA/40 LM) was 5.47%, 4.96%, and 4.56% in the soil of Tangshan, Harbin, and Sian, respectively. The soil moisture content and clay content were observed to decrease gradually with increasing the burial time. The biodegradation test of LBPAA (60 PAA/40 LM) composite exhibited different bacterial colony forming units (CFU), the soil of Tangshan was 2.0 × 10 3 CFU·g −1 soil, 7.0 × 10 3 CFU·g −1 soil for Harbin, and 6.10 × 10 4 CFU·g −1 soil for Sian. However, the organic matter contents in the soils did not have significant changes (Tangshan 6.21 mg·g −1 , Harbin 0.61 mg·g −1 , and Sian 0.405 mg·g −1 ).
研究领域:
材料科学
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环境科学
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农业
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Yinchen Chen,Hui Zhang,Zhaodong Zhu,Shiyu Fu
Lignin is a good candidate for the polymerization and chemical modification to prepare sustainable chemicals and materials, but a relatively low hydroxyl content becomes an obstacle for the preparation of lignin-based polyurethane (PU) adhesives. In order to improve its reactivity, the acetic acid lignin (AAL) was hydroxymethylated before copolymerized with isocyanate during the preparation of PU adhesives. The hydroxymethylation was carried out in an alkaline formaldehyde solution and it was found that 85 °C is the optimal temperature. On that condition, the free formaldehyde content of the corresponding product HL-6 was as low as 0.32%, while the hydroxymethyl was increased by 189.11% compared with original AAL and reached 2.92 mmol/g. In the polymerization of PU adhesives, the hydroxymethylated lignin with a higher aliphatic hydroxyl content formed a more compact three-dimensional urethane cross-linking network with isocyanate. The mechanical properties and thermal stability of the lignin-based PU adhesive were improved by 15–30 wt% in HL-6, and particularly the tensile strength was increased by 21–41 MPa, which indicated that the hydroxymethylation is an efficient way to enrich the hydroxyl in lignin, and the modified lignin is adequate to partially replace petroleum-based polyols for the preparation of PU adhesives with excellent properties.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Qiaoling Liu,Hongyu Mou,Wenjun Chen,Xinhui Zhao,Haitao Yu,Zhimin Xue,Tiancheng Mu
Lignin dissolution is of great importance for the valorization of lignin, and development of novel efficient solvent systems is a crucial topic. Herein, 17 kinds of 1,5-diazabicyclo[5.4.0]-5-undecene-based eutectic molecular liquids (EMLs) were designed for dissolution of industrial lignins. The solubility of lignin in the EMLs significantly depended on the types of the EMLs and lignin. Also the relationship between lignin solubility and the solvatochromic parameters (α, β, and π*) varied significantly based on the EMLs and the types of lignin.
研究领域:
生物化学
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材料科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Yuandong Cui,Bin He,Yu Lei,Yu Liang,Wanting Zhao,Jian Sun,Xiaomin Liu
High and cost-efficient capture of CO 2 is a prerequisite and an inevitable path of carbon emission reduction. To address the challenges (high cost, low efficiency, less sustainability, etc .) of existing petroleum-based CO 2 absorbents, herein, a class of efficient and sustainable lignin-based absorbents were resoundingly prepared by grafting the active amine group on a lignin derived compound vanillin and alkali lignin. The results demonstrated that vanillin modified by acrylamide achieved the excellent absorption capacity among the three absorbents, whose ability was 0.114 g CO 2 per gram of absorbent under 25 °C and 100 kPa. In addition, the absorbent retained stable absorbability of CO 2 after 6 cycles. The absorbing capacity of the absorbent formed by the coupling of vanillin and acrylamide to CO 2 was much greater than their own ( i.e. 0 g CO 2 ·g −1 vanillin, 0.01 g CO 2 ·g −1 acrylamide, respectively). Detailed information revealed the multi-site synergistic absorption mechanism, in which CO 2 has C and O double interactions with the amide group of the absorbent, and single interaction with the hydroxyl oxygen on the benzene ring of the absorbent. The absorption capacity of modified lignin for CO 2 is as high as 0.12 g CO 2 per gram of absorbent, which is comparable with that of model compound vanillin. This work not only provides a new idea for the design of bio-absorbents for CO 2 capture, but explores the application potential of lignin-based materials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 30
·19485-19494
·
IF 4.036
Peng-Hui Li,Yu-Meng Wei,Cai-Wen Wu,Chi Yang,Bo Jiang,Wen-Juan Wu
With the rapid development of the global economy, the depletion of fossil fuels and the intensification of environmental pollution, there is an increasingly urgent need for new and green electrochemical energy storage technologies in society. In this thesis, ligninsulfonate/polyaniline nanocomposites were synthesized by in situ chemical oxidation using aniline as the monomer, lignin as the template and dopant, and ammonium persulfate as the oxidant. The results showed that the average diameter of the ligninsulfonate/polyaniline nanocomposite was 85 nm, and the composite electrode exhibited good electron conduction ability and excellent capacitive performance by ligninsulfonate doping. The electrode material showed the best electrochemical performance when the ligninsulfonate addition was 0.1 g. The specific capacitance can reach 553.7 F g−1 under the current density of charge/discharge 1 A g−1, which is higher than that of the pure PANI electrode. The composite electrode material has good multiplicative performance and cycling stability, and the capacitance retention rate can be maintained at 68.01% after 5000 cycles at a charge/discharge current density of 10 A g−1 (three-electrode system), and the capacitance retention rate can be maintained at 54.84% after 5000 cycles at a charge/discharge current density of 5 A g−1 (two-electrode system).
研究领域:
材料科学
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能源技术
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
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2022
·
IF 5.204
Xiuyuan Ma,Jiayue Ma,Mengzhu Li,Yuanxin Gu,Ting Wang
Effective degradation of lignin and further production of small-molecule aromatic chemicals are of great importance in sustainable chemistry. In this experiment, lignin was efficiently oxidatively degraded under mild conditions using inexpensive manganese dioxide rather than a precious metal catalyst, with a lignin degradation efficiency of 66%. A double electrolytic cell system was then used to achieve the recycling of manganese dioxide at the anode while producing hydrogen at the cathode. GC-MC analysis showed that the lignin was degraded to chemicals containing small aromatic molecules such as benzoic acid and benzyl acetate. This experiment provides a new pathway for the cyclic degradation of lignin.
研究领域:
可持续化学
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电化学
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生物质转化
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）