DESALINATION
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2022
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IF 11.211
Shan Jiang,Zhengze Zhang,Tong Zhou,Sicong Duan,Zhouli Yang,Yujun Ju,Chao Jia,Xiaoquan Lu,Fengjuan Chen
Solar-driven interfacial evaporation is an emerging water treatment technology for fresh water generation. However, poor thermal localization performance and rapid salt accumulation of the designed evaporator are the two factors, restricting the practical application. Here, a cost-effective lignin-based hydrogel with three dimensional meso /micro-porous structures is prepared by a facile and scalable crosslinking-polymerization strategy. Benefiting from numerous hydrophilic hydroxyls in lignin as well as 3D hierarchical porous structure, the designed hydrogel exhibits sufficient water supplement, effective water activation, as well as fantastic anti-salt accumulation performance. Our lignin hydrogel-based evaporator achieves a high and stable evaporation rate of 2.25 kg·m −2 ·h −1 for 24 h continuous operation without salt crystallizing and blocking, and shows a good stability in a wide range of pH value from 1 to 14. In addition, heavy metal ions , including Cu 2+ , CrO 4 2− , Co 2+ are efficiently removed from polluted water by electrostatic interaction with excess hydroxyl groups in the lignin hydrogel. Therefore, lignin hydrogel-based evaporator offers a cost-effective and long-term anti salt blocking strategy for solar-driven water purification.
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高影响因子
FUEL
·
2022
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IF 8.035
Guodian Zhu,Yuehua Wu,Yuebin Xi,Shaoqu Xie,Guoqiang Yin,Xiaojing Lv,Xuliang Lin
Lignin has immense potential for the production of monoaromatics that can be further prepared as target chemicals or alkyl biofuels. In this work, experiments and density functional theory (DFT) calculations were employed to investigate the effect of benzylic alcohol ( α -hydroxyl group, C α H─OH) dehydration to α , β -alkenyl group (C α = C β ) on the enhancement of the β -aryl ether ( β -O-4) bond cleavage reactivity of lignin model dimer over Pd/C by formic acid. This study demonstrated that the β -O-4 bond cleavage reactivity was significantly enhanced via the benzylic alcohol dehydration to C α = C β . The cleavage reactivity of the β -O-4 bond attached to C α functional groups was in the order of α -hydrogen atom (C α H─H) > C α H─OH > α -carbonyl group (C α = O). An easy formation of the C α H─H from the C α = C β hydrogenation led to the enhancement of the β -O-4 bond cleavage reactivity being achieved. The β -O-4 bond cleavage rate was increased by 6.2 times in the presence of the C α H─H compared to the C α = O. Due to few and lower required energy barriers after C α H─OH dehydration, the β -O-4 bond attached to the C α = C β was more thermodynamically favorable to be cleaved. The work highlights the prospect of efficient depolymerization of lignin into monoaromatics.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 18
·8644-8652
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IF 3.925
Minpeng Zhang,Huitong Xu,Lei Wu,Yu Tan,Dezhi Kong,Mamatjan Yimiti
As the most abundant renewable aromatic resource, the catalytic depolymerization of lignin to obtain high value-added aromatics is very attractive but full of challenges. Photocatalysis is a promising approach in this case. In this research, calcination and solvothermal procedures were used to make TiO2/g-C3N4 heterojunction composites, and XRD, SEM, and TEM characterization methods were used to investigate the structural and morphological properties of TiO2/g-C3N4. Photoluminescence and photoelectrochemical measurements were conducted to confirm the evidence of efficient charge carrier separation by nano-composites. TiO2/g-C3N4 doped with 10 mg of g-C3N4 had the best efficacy under simulated sunshine irradiation, with lignin degradation reaching 75%, which was twice as effective as pure TiO2. Lignin was successfully reduced into tiny molecules, thus according to GC–MS analysis, and TiO2/g-C3N4 showed good application possibilities in the catalytic degradation of lignin. The radical trapping and electron spin resonance outcomes supported the role of oxidative active species and its interaction in the degradation of lignin. The likely mechanism of the photocatalytic reaction was hypothesized, the degradation products were studied, and the various pathways of lignin degradation were addressed based on the experimental data.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Kai-Ning Zhang,Cheng-Zhen Wang,Qiu-Feng Lü,Ming-Hui Chen
Functionalized two-dimensional Ti 3 C 2 T x (TN-EHL) was prepared as an effective adsorbent for removal of methylene blue dye (MB) and copper ions (Cu 2+ ). Enzymatic hydrolysis lignin (EHL), a reproducible natural resource, was used to functionalize the Ti 3 C 2 T x nanosheets. EHL can not only introduce active functional groups into TN-EHL but also prevent the oxidation of Ti 3 C 2 T x , thus promoting the adsorption performance of TN-EHL. The maximum adsorption capacities of TN-EHL50 (in which the EHL content is 50 wt%) for MB and Cu 2+ were 293.7 mg g −1 and 49.96 mg g −1 , respectively. The higher correlation coefficients ( R 2 ) of MB (0.9996) and Cu 2+ (0.9995) indicating that their adsorption processes can be described by the pseudo-second-order kinetic model. The MB adsorption data fit the Freundlich isotherm with R 2 of 0.9953, whereas the Cu 2+ ions adsorption data fit the Langmuir isotherm with R 2 of 0.9998. The thermodynamic analysis indicates that the adsorption process of MB and Cu 2+ on TN-EHL50 is spontaneous and endothermic. Significantly, the Cu 2+ ions were reduced to Cu 2 O and CuO particles during the adsorption process. Therefore, TN-EHL has a great potential as an environmentally friendly adsorbent for MB removal and recovery of Cu 2+ ions from wastewater.
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PubMed
高影响因子
RSC Advances
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2022
·Vol. 12
·期 19
·11843-11852
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IF 4.036
Qi Guo,Xinglong Hou,Wei Xu,Junli Liu
Ni3Co1/ELAC catalyst, prepared by the enzymatically hydrolyzed lignin activated carbon as a carrier and a 3 : 1 ratio content of nickel and cobalt, can selectively convert furfural to cyclopentanol (CPL) in aqueous solution. We used activated carbon prepared by the phosphoric acid method as the carrier, and investigated the effect of the carrier on the catalyst activity. The ratio of bimetal (Ni, Co) content and reaction conditions (reaction temperature, reaction time, initial H2 pressure) have also been investigated in the furfural hydrogenation. With the optimal Ni3Co1/ELAC catalyst, the conversion rate of furfural and the selectivity of CPL were 100% and 94.1%, respectively. In this process, some important catalysts were studied by XRD, XPS, ICP-AES, BET and TEM characterization. Through experimental results and other people's research, we deduced a reasonable reaction path and verified it by replacing the reaction substrate and solvents. Finally, the experiment proved that the formation of CPL by furfural required the occurrence of a rearrangement reaction and the participation of aqueous solution.
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高影响因子
RSC Advances
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2022
·Vol. 12
·期 18
·11517-11525
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IF 4.036
Mengmeng Li,Wentao Huang,Changying Ren,Qiang Wu,Siqun Wang,Jingda Huang
Lignin is an ideal substance for preparation of functional materials. Specifically, lignin nanospheres (LNPs) are formed by self-assembly of lignin molecules and show great application prospects in drug delivery, electrochemistry, catalysis, etc. At present, most superhydrophobic surfaces are mainly built using non-degradable inorganic particles and are still beset by defects such as poor environmental performance, easy aging, and low mechanical strength. In this study, an aqueous mixture containing LNPs, cellulose nanocrystals (CNCs) and polyvinyl alcohol (PVA) was sprayed onto wood surfaces and then modified by 1H,1H,2H,2H-perfluorooctyltrichlorosilane (FOTS) to obtain a superhydrophobic surface. In the superhydrophobic surface, LNPs were used as the main structural materials instead of inorganic particles, CNC was used as a reinforcement material and PVA was used as an adhesive. The resulting superhydrophobic surface showed a water contact angle (WCA) of 162°, good robustness resistance and long UV resistance in which the superhydrophobicity was still retained after exposure to ultra-high UV light (power of 1000 W) for 7 h, providing more directions for high-value application of lignin.
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PubMed
高影响因子
CARBON
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2022
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IF 11.307
Yiying Yue,Yu Wang,Junyao Li,Wanli Cheng,Guangping Han,Tao Lu,Chaobo Huang,Qinglin Wu,Jianchun Jiang
Oil spillage accidents have caused serious environmental issues, and resulted in oil-cleaning materials receiving widespread attention. In this study, lignin, a crucial recalcitrant component in biomass utilization , was employed to mediate the preparation of graphene aerogel for oil/water separation and rapid regeneration through combustion. The resultant aerogel exhibits ultralight weight (14.22 mg/cm 3 ), high porosity (99.01%), good mechanical properties (1.361 ± 0.04 MPa), super-hydrophobicity (Water Contact Angle = 154.9°), excellent oil and water separation performance (adsorption capacity of chloroform = 102 g/g), and rapid regeneration via direct ignition within 1 min. In addition, the obtained aerogel not only maintained high oil absorption rates in harsh environments (strong acid, strong alkali, high salinity, and high temperature) and facilitated continuous separation of oil and water through pumping but also retained approximately about 90% of the initial absorption capacity after at least 20 combustion cycles. Therefore, based on these extraordinary properties, the obtained aerogel demonstrates great potential for the treatment of marine oil spills. Furthermore, this work may provide a new approach for realizing the high-value utilization of lignin.
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高影响因子
Molecular Catalysis
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2022
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IF 5.089
Jie Xu,Jiusheng Shi,Jingyu Wang,Lihui Zhang,Yujie Wang
Depolymerizing lignin to prepare aromatic high-value chemicals is beneficial to solve the problem of energy shortage and waste of resources. However, cleavage of lignin C C bonds still faces greater challenges due to the recalcitrance of C C bonds in lignin. Photocatalysis is considered to be a promising way to break lignin C C bonds under mild conditions. Here, the micellar aqueous medium (SDS) composed of sodium lauryl sulfonate and water was prepared. 1, 2-Diphenylethanol (lignin model compound, Dpol) and dioxanesolv poplar lignin can be well dispersed in SDS-8 (mass fraction of 0.08% for sodium lauryl sulfate). Photocatalyst g-C 3 N 4 can efficiently break the lignin C C bonds in SDS-8 and very high photocatalytic efficiency can be obtained. A small amount of acetic acid can further improve photocatalytic efficiency. The main products produced by photocatalytic breaking lignin C C bonds are benzaldehyde and benzoic acid. The mechanism of photocatalytic cleavage of lignin C C bonds mainly follows a photogenerated electron-hole coupled redox mechanism. Thereinto, the hydrogen provided by SDS-8 has powerfully promoted photocatalytic efficiency. Our work provides a new direction for photocatalytic cleavage of lignin C C bonds into aromatic high-value chemicals.
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高影响因子
DIAMOND AND RELATED MATERIALS
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2022
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IF 3.806
Dawei Xu,Dipan Xuan,Yongchao Liao,Fenqiang Luo,Taiyu Lyu,Minghao Chen,Chaoran Liu,Qian Liu,Zhuang Wang,Shuirong Li,Dechao Wang,Zhifeng Zheng,Lingzheng Bu
In order to obtain high performance, economic and environmentally friendly supercapacitor electrodes, lignin is converted into lignin-based phenolic resin and spun with polyvinyl alcohol (PVA) to obtain lignin-derived carbon membrane (LCM). Then LCM is used as substrate, and α-Fe 2 O 3 /LCM and LCM@ppy-10 composite materials are prepared as positive and negative electrodes, respectively, of supercapacitor electrodes. The results show that the composite electrodes have excellent electrochemical performance . At the current density of 1 mA cm −2 , α-Fe 2 O 3 /LCM and LCM@ppy-10 show a high area specific capacitance of 487 mF cm −2 and 440 mF cm −2 , respectively. The capacitance of the symmetrical button cells assembled by each electrode almost shows stability after 5000 cycles. In different systems, such as asymmetric aqueous supercapacitor and solid-state asymmetric supercapacitor , the composite electrodes also have excellent performance. The voltage of asymmetric supercapacitors is 1.6 V with area specific capacitance of 101 mF cm −2 at 1 mA cm −2 . After 10,000 cycles at 2 mA cm −2 , the specific capacitance decreases by only 5 %. The area specific capacitance and volume specific capacitance of solid-state asymmetric supercapacitor is 89 mF cm −2 and 1.74 F cm −3 , respectively, at 1 mA cm −2 . The maximum energy density and maximum power density of the solid-state asymmetric supercapacitor can reach 0.62 mWh cm −3 and 77.2 mW cm −3 . This method can provide a new reference for the preparation of composite electrode with LCM as current collector.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2022
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IF 6.449
Xindong Chen,Hailong Li,Shimiao Yao,Can Wang,Xuefang Chen,Haijun Guo,Lian Xiong,Hairong Zhang,Xinde Chen
Lignin is regarded as the primary factor that inhibits enzymatic hydrolysis of cellulose . However, the impact of cellulose ultrastructure on the inhibition of lignin during enzymatic hydrolysis is still unclear. In this work, the addition of lignin during enzymatic hydrolysis of cellulose with different ultrastructure was investigated. Furthermore, the influences of changing cellulose ultrastructure on cellulose conversion of pine after hydrothermal treatment (HT) without and with additives (2-naphthol (2 N) and phloroglucinol (PL)) were explored in detail. The results showed that enzymatic hydrolyzability of allomorphic cellulose was strongly inhibited by lignin. In contrast, a small inhibition degree of lignin was observed for amorphous cellulose. Surprisingly, the cellulose conversion of HT treated pine was dramatically decreased (18.45–6.25%) after ball-milling treatment (BM), while it was significantly increased (18.45–74.49%) after concentrated phosphoric acid treatment (CP). In addition, the addition of 2 N or PL during HT could promote or inhibit cellulose conversion due to the changes in the condensation degree of lignin. These results indicated that the physiochemical structure of lignin has a significant effect on cellulose hydrolysis. More importantly, the increasing degree of cellulose conversion was enhanced in sequence from HT+PL (6.19–35.00%), HT (18.45–74.49%), to HT+ 2 N (21.12–92.30%) after CP, which was attributed to the reducing lignin condensation and changing cellulose ultrastructure. Overall, this work demonstrated that the inhibition degree of lignin was highly dependent on the cellulose ultrastructure.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Zhenrong Tan,Ling Hu,Dongjie Yang,Dafeng Zheng,Xueqing Qiu
Hypothesis Super-hydrophilic/underwater super-oleophobic materials composed of biomass show great advantages for the treatment of oily wastewater due to their inherent fouling resistance. However, the development of three-dimensional materials from biomass for oil–water separation is still a challenge. It is universally acknowledged that constructing a rough structure on the surface of hydrophilic substrates would significantly improve the underwater oleophobicity and oil–water separation performance. Experiments In this work, a three-dimensional lignin/cellulose aerogel (LCA) was developed through sol–gel method with freeze-drying. The rough microstructure and 3D interconnected network composed of lignin and cellulose impart excellent underwater superoleophobicity to LCA for efficient oil–water separation. Findings The introduction of lignin to cellulose aerogel could effectively enhance its surface roughness , water permeation speed and underwater oil contact angle. Especially, the swelling properties of the hydrogel could be regulated by modulating the content of lignin, which could further control the pore size of aerogels to optimize the separation flux. The as-prepared aerogel showed remarkable performance in separating various oil–water mixtures and oil-in-water emulsions, with a separation flux of 7646 ± 167 L·m −2 ·h −1 and oil rejection rate >99 %. These excellent properties combined with its facile fabrication make LCA a promising candidate for the treatment of oily wastewater.
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PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
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IF 9.463
Lina Liu,Bingbing Shi,Anlin Zhang,Yijiao Xue,Jianzhong Zhang,Jinfeng Dai,Morteza Hassanpour,Long-Cheng Tang,Yongqian Shi,Pingan Song
It has been desirable to create biodegradable polymer materials that are thermally stable, flame- retardant and mechanically robust. One promising strategy is to develop fire retardant polylactide (PLA) using lignin as inexpensive fillers, but existing functionalized lignin cannot improve the thermal stability of PLA, in addition to unsatisfactory fire retardancy. Herein, we report a lignin-derived fire retardant (LF) by grafting polyphosphoramide into the chemical structure of lignin waste through graft polymerization. The results show that with 8 wt% of LF, the final PLA shows significantly enhanced thermal stability in N 2 . Moreover, the resulting PLA achieves a satisfactory UL-94 V-0 rating, meeting the demanding requirement of fire retardancy in industries. Additionally, the PLA/LF composite displays increased elastic modulus and well-preserved strength and ductility of pure PLA. This work provides an effective strategy for creating biobased fire retardant additives using industrial lignin waste, and PLA biocomposites which hold great promise for packaging, fabrics, electronic, and automotive applications.
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高影响因子
危险品化学品经营许可证（带存储）