RENEWABLE ENERGY
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2023
·
IF 8.7
Zhipeng Tian,Xiaoxin Chen,Tao Liu,Junyao Wang,Chao Wang,Riyang Shu,Jianping Liu,Ying Chen
Selective hydrodeoxygenation (HDO) of phenolic compounds derived from the pyrolysis lignin-oil to desired products is a promising route in the high-value utilization of biomass-derived products. As high as 99.99% guaiacol conversion and 96.70% cyclohexanol selectivity are obtained over optimized Co/1 K–Al 2 O 3 catalyst, which are better than those Co-based catalyst reported in previous studies. Highly dispersed Co particles provide more metal active sites and better chemisorption of guaiacol molecules, which promotes HDO activity. Importantly, with the increase amount of K species doped in Al 2 O 3 support, the total amount of acid sites on catalyst decreases and the strong acid site disappear, which inhibits unwanted conversion of cyclohexanol to the byproduct cyclohexane. It can be found that with proper amount of acid sites and strength, the selectivity of cyclohexanol can be maximized during selective HDO reaction of guaiacol. The kinetic study also shows that the activation energy from cyclohexanol to cyclohexane increases from 62.08 kJ/mol over Co/Al 2 O 3 catalyst to 86.11 kJ/mol over Co/1 K–Al 2 O 3 catalyst, implying that the reaction barrier improves, which hinders further removal of hydroxyl group on cyclohexanol. Besides, selective HDO reactions using other typical phenols as substrates over Co/1 K–Al 2 O 3 catalyst were performed and good alkyl cyclohexanols selectivities are observed.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Jinsheng Sun,Xiaofeng Chang,Kaihe Lv,Jintang Wang,Fan Zhang,Jiafeng Jin,Xinyu Zhou,Zhiwen Dai
The sustainable development of global energy necessitates high-performance water-based drilling fluid (WDFs) with low toxicity and sustainability, especially in high salinity reservoir excavation. Herein, we report an environmentally friendly and salt-responsive zwitterionic polymer brush based on enzymatic lignin nanoparticles (EHL) prepared by intramolecular self-assembly as a fluid-loss additive (EHL-ASN) for WDFs by the anti-polyelectrolyte effect to overcome the issues of wellbore instability and collapse caused by the deterioration of rheological and filtration properties of WDFs due to electrolyte invasion in drilling high salinity reservoirs and reveal the salt response mechanism of EHL-ASN. The ascending viscosity of EHL-ASN solution corresponded to the heightening of electrolyte salinity, which revealed that EHL-ASN solution had obvious salt response. The biological toxicity evaluation of EHL-ASN exhibited that its half maximal effective concentration (EC 50 ) was 51,900 mg/L, which accorded with the direct emission standard. Additionally, the results for rheological and fluid-loss performance evaluation of EHL-ASN/WDFs promulgated that EHL-ASN had significant effects on heightening viscosity and debasing fluid-loss, in which, EHL-ASN could significantly debase the fluid-loss (FL API ) of saturated salt-based mud (SSBM) from 194 mL to 4 mL, with a decline rate of 97.9%. This work not only provides a novel approach for high value utilization of lignin, but also paves the way for the development of environmentally friendly intelligent WDFs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Chen Hou,Wenqiang Chen,Linhui Fu,Sufeng Zhang,Chen Liang,Yang Wang
Perfluorooctanoic acid (PFOA) has demonstrated potential toxicity to human health and has been detected in different environmental matrices due to its stable physical and chemical properties. To degrade PFOA under solar light irradiation, we fabricated a lignin/polyvinyl alcohol (PVA)/Co/Fe metal-organic frameworks (lignin/PVA/bi-MOFs) composite membrane via a typical electrospinning and in-situ solvothermal method for the catalytic degradation of PFOA. In the peroxymonosulfate (PMS)/membranes/solar light system, Electron paramagnetic resonance analysis (EPR) demonstrated the sulfate radicals (SO 4 − ) and hydroxyl radicals (OH ) were generated by activating PMS with transition metal and solar light irradiation. Lignin/PVA/bi-MOFs showed outstanding performance in that 89.6% of PFOA was degraded within 3 h under optimal conditions. Compared with that in solar light, only 59.6% PFOA was degraded in the dark, and the rate constant of PFOA degradation decreased from 0.0150 min −1 to 0.0046 min −1 . Moreover, lignin/PVA/bi-MOFs were reused after simply rinsing with ultra-pure water and the degradation capacity of lignin/PVA/bi-MOFs remained at 77% after 4 cycles. The results might provide a new concept for the design of bimetallic MOFs for applications in organic pollutant removal.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Hao Li,Haoyang Wang,Osama M. Darwesh,Jingjing Du,Shan Liu,Chunli Li,Jing Fang
Adsorption is considered to be a promising butanol recovery method for solving the issue of inhibition in the ABE (acetone-butanol-ethanol) fermentation. As a byproduct in the second generation biobutanol industry, lignin was found to be a good adsorbent for the butanol enrichment. It is conducive to the full utilization of renewable lignocellulose biomass resource. Kinetic and equilibrium experiments indicated that lignin had a satisfactory adsorption rate and capacity that are comparable to those of many synthetic materials. Multicomponent adsorption experiments revealed that lignin had higher adsorption selectivity toward butanol than that of ethanol and acetone. The adsorption capacity of lignin for butanol first increased and then gradually decreased with increasing temperature. And maximum adsorption capacity reached 304.66 mg g −1 at 313 K. The inflection point of temperature is close to the ABE fermentation temperature of 310 K. The condensed butanol by desorption was 145 g L −1 , with a satisfying regeneration performance. 1 H NMR and FT-IR spectra indicated that the aromatic units of lignin formed π -systems with A/B/E. The π -system is particularly significant for butanol due to its longer hydrocarbon chain. These results could contribute to the emerging lignin-based materials for butanol separation.
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Arabian Journal of Chemistry
·
2020
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IF 4.762
Hang Yu,Jing Wang,Jun-xia Yu,Yi Wang,Ru-an Chi
Adsorption performance and stability of the carboxyl groups modified straws and their extracts of cellulose, lignin, and hemicellulose for Pb 2+ were investigated, and the optimum pH range for Pb 2+ adsorption was determined by considering both the stability and capacity of the modified biosorbents for the first time. Results showed that adsorption capacity and stability of the straws and extracts were both improved significantly after modification. Adsorption capacities of the modified straws and extracts followed the order: modified hemicellulose > modified lignin, modified straw > modified cellulose, while stability of them followed the reverse order. In the optimum pH range from 4.0 to 5.0, modified rape and cotton straw showed better stability than the modified maize straw, and total organic carbon (TOC) values determined from the two modified straws and extracts were lower than 5.0 mg L −1 even after adsorption for 30 days, which reached the drinking water standard in China.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Wentao Wang,Fei Wang,Cheng Zhang,Jiaoning Tang,Xierong Zeng,Xuejuan Wan
Bio-based copolymers with versatile properties and good processability are highly desired for practical applications. Herein we describe novel hyperbranched adhesive, UV protective coatings and functional elastomers with 6.1–9.5 wt% lignin synthesized by a one-pot RAFT grafting polymerization. The unique macromolecular structure and sufficient hydrogen bonds of these Lignin- graft -poly( n -butyl acrylate- co -1-vinylimidazole) copolymers (Lignin-BVs) resulted in fascinating and controllable features. Specifically, incorporating 13.9 wt% imidazole (VI) effectively improved the adhesive performances with maximal adhesive force and strength up to 34.0 N and 367.8 N·s, respectively, which were better than the commercial 3 M double-sided adhesive. Owing to water-resistance and UV absorption capacity, our Lignin-BVs could be served as excellent adhesive coatings for future outdoor decorative materials, safety clothing or beach umbrella. Moreover, upon increasing VI content to 19.4 wt%, Lignin-BV19.4 elastomer showed automatically room temperature self-healing behavior and could be fabricated into skin-adhesive strain sensor. Our studies provided a green and effective method in the preparation of the high value-added lignin copolymers, which could be appealing to both frontier research and industrial development.
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FUEL
·
2021
·
IF 6.609
Mingqiang Chen,Jingjing Shi,Yishuang Wang,Zhiyuan Tang,Zhonglian Yang,Jun Wang,Han Zhang
Highly efficient conversion of lignin to value-added liquid fuel or phenol monomers has attracted widespread attentions. The W-Ni-Mo/SEP trimetallic catalyst was firstly prepared and used for lignin catalytic depolymerization (LCD) under supercritical ethanol, which significantly ameliorated the problem of complex product compositions and poor cycle-stability in Mo/SEP. Characterization results confirmed that doping W and Ni metals led to the transformation of metallic oxide phases, and then increased oxygen vacancies (O V ), enhanced the metal-support interaction, and lowered acid site content. The experimental results revealed that W-Ni-Mo/SEP yielded 39.56% of lignin oil (LO) with 32.37 MJ/kg of HHV at 280 °C for 4 h. The selectivity to guaiacol and ethoxyphenol monomer was remarkably increased as compare with Mo/SEP. Furthermore, the W-Ni-Mo/SEP catalyst exhibited unique cycle stability and produced LO even increased to 41.41% after five LCD cycles. The possible reaction paths of lignin converted to guaiacol and ethoxyphenol over W-Ni-Mo/SEP were proposed. Brønsted-acid site promoted the self-activation of ethanol to form aliphatic products. The higher O V preferentially adsorbed phenol-intermediates containing dual oxygens and activated direct dealkylation to obtain guaiacol. The lower Lewis-acid site promoted the demethylation of methoxy in side-chains of phenol-intermediates and then interacted with free ethyl groups to form ethoxyphenol.
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Nanomaterials
·
2019
·Vol. 9
·期 2
·E210
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IF 4.034
Qingtong Zhang,Mingfu Li,Chenyan Guo,Zhuan Jia,Guangcong Wan,Shuangfei Wang,Douyong Min
Lignin is the second largest naturally renewable resource and is primarily a by-product of the pulp and paper industry; however, its inefficient use presents a challenge. In this work, Fe₃O₄ nanoparticles loaded on lignin nanoparticles (Fe₃O₄@LNPs) were prepared by the self-assembly method and it possessed an enhanced peroxidase-like activity. Fe₃O₄@LNPs catalyzed the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H₂O₂ to generate a blue color, was observable by the naked eye. Under the optimal conditions, Fe₃O₄@LNPs showed the ability of sensitive colorimetric detection of H₂O₂within a range of 5⁻100 μM and the limit of detection was 2 μM. The high catalytic activity of Fe₃O₄@LNPs allows its prospective use in a wide variety of applications, including clinical diagnosis, food safety, and environmental monitoring.
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ChemSusChem
·
2019
·Vol. 12
·期 21
·4791-4798
·
IF 7.804
Xiaohao Liu,Chenguang Wang,Ying Zhang,Yan Qiao,Yang Pan,Longlong Ma
Graphical Linked in to lignin : 4-Alkylphenol is produced selectively over a magnetic Co 1 –Fe 0.1 @NC catalyst from real lignin oil as feedstock, which is obtained by a “lignin-first” strategy from raw biomass. The incorporation of Fe attenuates the adsorption of 4-alkylphenol to the catalyst, which inhibits the further hydrogenation of 4-alkylphenol to 4-alkylcyclohexanol. Lignin valorization to produce high-value chemicals selectively is an enormous challenge in biorefinery. In this study, 4-alkylphenol, formed by breaking the robust C aryl −OCH 3 bonds solely with the retention of other structures in lignin-derived methoxylalkylphenols, was produced selectively over a Co 1 –Fe 0.1 @NC catalyst from real lignin oil as feedstock, which was obtained by a “lignin-first” strategy from either birch or cornstalk. A yield of 64.7 or 88.3 mol % of 4-propylphenol was obtained if birch lignin oil or eugenol was used as the substrate, respectively. The catalysts were characterized by using methods that include Brunauer–Emmett–Teller measurements, XRD, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, high-angle annular dark-field scanning transmission electron microscopy, energy-dispersive X-ray spectroscopy, and temperature-programmed desorption with synchrotron vacuum ultraviolet photoionization mass spectrometry. The results of catalyst characterization and comparison experiments indicated that CoN x was the main active phase for demethoxylation and hydrogenation, and the incorporation of Fe weakens the adsorption of 4-propylphenol to the catalyst, which inhibits the excessive hydrogenation of 4-propylphenol. This work shows the potential to produce high-value-added 4-alkylphenol from renewable raw biomass.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2018
·
IF 4.841
Wenna Ge,Zhiping Zhou,Peng Zhang,Qingfang Zhang,Zhen Cao,Ruilong Zhang,Yongsheng Yan,Jiangdong Dai
Here, a new hierarchical porous carbon was first prepared from sodium lignosulphonate (SLS), an industrial by-product, via a confined carbonization and alkali activation methods using graphene oxide (GO) as template, and was used for ciprofloxacin (CIP) removal. The addition of GO nanosheets remarkably affected the morphology and pore structure. GLHPC-1, obtained at GO/SLS weight ratio of 1:100, possess a largest specific surface area of 3223 m 2 g −1 and pore volume of 2.275 cm 3 g −1 , and thus exhibited an ultrahigh adsorption of 980.4 mg g −1 at 318 K and fast adsorption rate, as well as a good recycle ability in practice.
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BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Jing Yang,Liang Zhao,Shaotong Liu,Yuanyuan Wang,Liyi Dai
Catalytic hydrocracking of kraft lignin was carried out in isopropanol system and an orthogonal array design (OAD) was employed to optimize the experimental conditions. GC–MS/FID, elemental analysis, GPC and 1 H- 13 C HSQC NMR were carried out for entire investigation of the liquid products. The results indicated that the hydrocracking process was thermally controlled and catalysts showed significant influences on the product distributions. Comparing with Pd/C, Pt/C and Ru/C, Rh/C inhibited the self-condensation of isopropanol and reduced the formation of oxygenic-chain compounds. The excellent catalytic activity for phenols conversion was obtained over Rh/C. The routes of oxygenic-chain compounds formation and phenol conversion were proposed in detail. The least oxygenic-chain compounds formation, the highest phenols conversion (93.4%), the lowest O/C ratio (0.094) and the highest HHV (37.969 MJ/kg) provided the possibility of the high quality bio-oil obtained over Rh/C in isopropanol medium.
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CURRENT ISSUES IN MOLECULAR BIOLOGY
·
2024
·Vol. 46
·期 4
·3694-3712
·
IF 2.8
Kai Li,Yuan Wang,Xiao Guo,Bo Wang
Establishing a multi-enzyme synergistic lignocellulosic biodegradation system using lytic polysaccharide monooxygenase (LPMO) and polyphenol oxidases is vital for efficiently utilizing plant biomass waste, ultimately benefiting the carbon cycle and promoting environmental protection. Single-residue mutations of LPMO can improve the efficiency of lignocellulosic biomass degradation. However, the activity of mutant-type LPMO in relation to lignin-diverted reducing agents has not been sufficiently explored. In this study, laccase and tyrosinase were initially investigated and their optimal conditions and impressive thermal stability were revealed, indicating their potential synergistic abilities with LPMO in lignocellulose biodegradation. When utilizing gallic acid as a reducing agent, the activities of LPMOs were increased by over 10%, which was particularly evident in mutant-type LPMOs after the addition of polyphenol oxidases. In particular, the combination of tyrosinase with either 4-hydroxy-3-methoxyphenylacetone orp-coumaric acid was shown to enhance the efficacy of LPMOs. Furthermore, the highest activity levels of wild-type LPMOs were observed with the addition of laccase and 3-methylcatechol. The similarities between wild and mutant LPMOs regarding their activities in lignin-diverted phenolic compounds and reducing agents are almost identical, suggesting that the single-residue mutation of LPMO does not have a detrimental effect on its performance. Above all, this study indicates that understanding the performance of both wild and mutant types of LPMOs in the presence of polyphenol oxidases and various reducing agents constitutes a key link in the industrialization of the multi-enzyme degradation of lignocellulose.
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