APPLIED CATALYSIS A-GENERAL
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2022
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IF 5.723
Qiaozhi Ma,Jianying Lin,Mingzhao Guan,Haotong Liang,Qiyu Liu
Selective hydrolysis of crystalline cellulose to cello-oligosaccharides in molten salt hydrates (MSHs) is a promising method for valorization of lignocellulose. However, the by-products derived from cellulose hydrolysis can facilitate cello-oligosaccharide degradation and decrease its selectivity. To address this issue, lignin-based hyper cross-linked polymers (LHCPs) were prepared to in situ adsorb by-products during hydrolysis and thus prevent cello-oligosaccharides from degradation. The synthesized LHCP‐33%, with a high lignin content of 33%, showed a remarkable surface area of 708.7 m 2 g −1 and good hydrophilicity, exhibiting a promising adsorption capacity of 340 mg g −1 towards 5-hydroxymethylfurfural (5-HMF), which is supposed to be the major cellulose-derived by-product. We showed that 5-HMF adsorption was driven by the formation of CH-π bonds between 5-HMF and aromatic rings on LHCP. When LHCP‐33% was employed in cellulose hydrolysis, the yield of cello-oligosaccharide can be efficiently enhanced from 39.5% to 78.2%. This work offered a new application of lignin in enhanced cello-oligosaccharide production from cellulose.
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BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Jiajun Yu,Bingbing Luo,Yihan Wang,Siyu Wang,Kai Wu,Chao Liu,Sheng Chu,Huiyan Zhang
In this study, a simple and rapid method was proposed to synthesize orthorhombic α-Mo 2 C as catalyst for lignin catalytic pyrolysis. Biomass in-situ pyrolysis products were used as the carbon source and supporter, the carbonization of Mo precursor was realized under rapid heating. Experimental results show that Pine-Mo 2 C catalyst can achieve lignin pyrolysis vapor bond breaking and deoxidation under normal pressure, and the yield of monocyclic aromatic hydrocarbons is 13.26 wt%, of which aromatic hydrocarbons with side chain account for 74%. The side chain aliphatic hydrocarbons of lignin are effectively retained, and hydrogen consumption is minimized. The characterization of catalyst and experiments of guaiacol, 2-phenoxy-1-phenylethanol and 4,4′-biphenol shows that efficient deoxidation is due to targeted attack of catalyst on C-O. Therefore, Pine-Mo 2 C shows excellent activity in promoting direct bond breaking deoxidation of lignin.
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PubMed
高影响因子
FUEL
·
2021
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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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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
·
2021
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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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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
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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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
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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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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Haichuan Zhang,Zede Yi,Shiyu Fu,Changzhi Li,Lucian A. Lucia,Qiying Liu
A rational design of the intrinsic lattice structure of catalysts is vitally important to address catalytic performance. Herein is reported a top-down synthesis for the fabrication of a bifunctional metallic catalyst. First, palladium nanocubes with (100) lattices planes were synthesized through a shape-control strategy; next, the as-synthesized Pd/Co-ZIF was used as a template for in - situ phase reconstruction by a spontaneous phase transformation process in the presence of H 4 SiW under solvothermal conditions. Ultimately, formation of 3D hierarchical flower-like bimetallic nitride nanosheets (SiW 12 @Pd/Co-ZIF-NS) were generated because of this process. The SiW 12 @Pd/Co-ZIF-NS catalyst not only displays excellent catalytic transfer hydrogenolysis for C-O bond cleavage of lignin dimeric substrates, but also maintains superior recycling durability due to an encapsulation phenomenon preventing aggregation. Finally, the resulting nanocomposites exhibit superior activity and good size selectivity toward catalytic transfer hydrogenolysis of the actual lignin substrates to produce a significant amount of low-molecular-weight aromatic compounds .
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 34
·16043-16049
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IF 3.3
Hongbo Yu,Fei Zhang,Shuibo Wang,Yang Cong,Shiwei Wang,Lin Zhu
Hydrodeoxygenation of lignin-derived phenolic compounds to produce alkanes is a promising method used for mitigating fossil energy consumption, but they often require high temperature and high pressure, resulting in their poor catalytic stability and durability. In this study, we encapsulated ∼3.9 nm active metal Rh nanoparticles (NPs) into ∼40 nm hollow mesoporous aluminosilicate nanospheres (HMANs) to synthesize M@Alx–mSiO2 nanoreactors with adjustable Al contents for guaiacol hydrodeoxygenation. The optimized Rh@Al2.0–mSiO2 catalyst displayed significantly enhanced guaiacol activity and cyclohexane selectivity relative to the Rh@mSiO2 catalyst under mild reaction conditions. According to the characterization results, the high hydrodeoxygenation activity of Rh@Al2.0–mSiO2 could be attributable to the synergistic effect between the metallic Rh and Lewis and Brønsted acid sites, and the introduction of Al species greatly facilitated the adsorption of 2-methylcyclohexanol, thereby enhancing cyclohexane selectivity. The confinement effect of Rh NPs inside the hollow cavities effectively prevents the leaching and aggregation of Rh NPs, thereby improving their catalytic durability and stability.
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Materials Today Communications
·
2023
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IF 3.8
Ruoning Chu,Xiaojie Guo,Yongjun Zhang,Xiaoyu Zhao,Xiantao Xiong,Xiujuan Zhang,Fengyi Zhang,Kun Zhang,Yaxin Wang
Water containing heavy metal ions can be extremely harmful to the environment and human body, thus the development of low-cost and high-efficient adsorbents has an exciting prospect. In this study, lignin/graphene aerogels modified with polydopamine and polyethyleneimine , respectively, were successfully prepared to remove Cr(VI) from aqueous waste. The physicochemical properties of graphene aerogels (GA), lignin/graphene aerogels (LGA), polydopamine-modified lignin/graphene aerogels (LGA@PDA), polyethyleneimine-modified lignin/graphene aerogels (LGA@PEI) were investigated using FT-IR, Raman spectroscopy , XRD , XPS , SEM-EDS, and BET analysis. The results demonstrate that adsorbents have a high specific surface area, an interconnected porous structure, and a large number of oxygen-containing groups, making them particularly favorable for heavy metal adsorption. The effects of GO/lignin ratio, surface modifiers, solution pH, contact time, initial concentration and temperature on the Cr(VI) removal were investigated and compared via batch experiments. Compared with GA (138.74 ± 3.93 mg/g), the adsorption capacity of LGA with GO/LA ratio 40:1 increased to 167.66 ± 4.75 mg/g. Furthermore, the maximum adsorption capacity of LGA@PEI and LGA@PDA rose up to 209.85 ± 3.25 mg/g and 240.39 ± 3.26 mg/mg, respectively. By simulating the experimental data with different kinetic models and isotherm models, the adsorption processes of different lignin-derived aerogels were further explored under various conditions. All types of aerogels fit well with the pseudo-second-order model and Langmuir model. In addition, the XPS results confirm that the chemical reduction of Cr(VI) to Cr(III) also plays a role in the removal of Cr(VI). The results demonstrated that the removal effect of lignin-derived aerogels on Cr(VI) was greatly improved through the multi-functionalized surface modification of LGA with PDA and PEI. Furthermore, the removal efficiency of LGA@PDA and LGA@PEI for Cr(VI) remained stable after repeated regeneration. Therefore, the results of this study indicate that LGA@PDA and LGA@PEI are promising Cr(VI) adsorbents for practical applications in wastewater treatment.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
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IF 5.9
Ling Yang,Wenjie Luo,Yassen Muhammad,Fanyu Meng,Jiashun Li,Zhenxia Zhao,Jing Li
Agroforestry solid waste bagasse fiber (BF) possesses sustainable, carbon-neutral characteristics when used as a reinforcement material for asphalt pavements. However, the incompatibility between BF and the asphalt matrix limits its wide application. This study proposes a strategy for cost-effective and environmentally friendly modification of fiber surfaces, aiming to transform a drawback into an advantage. That is, the lignin in BF, which affects the tensile strength of fibers, is dissolved by a deep eutectic solvent (DES) system, and then the lignin is reborn on the surface of the fibers with the assistance of tannic acid . Based on the hydrophobicity and free radical trapping properties of lignin, regenerated lignin is expected to act as a natural coupling agent between BF and styrene-butadiene-styrene (SBS) asphalt materials and as an anti-aging agent for asphalt. The experimental results showed that the modified BF realized the enhancement of asphalt interfacial compatibility and toughening of asphalt matrix. Specifically, the shear resistance, viscoelasticity and rutting resistance of the modified BF/SBS-modified asphalt were improved by 46.61%, 22.67% and 30.06%, respectively, and the UV aging susceptibility was decreased by 75.02% compared with that of the BF/SBS-modified asphalt. In conclusion, this work introduces a simple and practical strategy for enhancing the interaction between BF and asphalt, which is crucial for advancing biomass recycling and green transportation development.
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