JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
·
IF 10.9
Anlin Zhang,Jianzhong Zhang,Lina Liu,Jinfeng Dai,Xinyu Lu,Siqi Huo,Min Hong,Xiaohuan Liu,Mark Lynch,Xuesen Zeng,Paulomi Burey,Pingan Song
Fabricating a high-performing thermoset using bio-based flame retardant is critical for the sustainable development of engineering materials with superior fire safety and robust mechanical properties . Herein, the epoxy (EP) composites with the industrial requirements are manufactured with a novel high-efficient, lignin-based flame retardant named DAL- x , which is fabricated by grafting 9, 10-dihydro-9-oxa-10-phosphaze-10-oxide (DOPO) onto lignin. The resulting DAL- x /EP composite exhibits excellent flame retardancy with a desirable UL-94 V-0 rating and a satisfactory limiting oxygen index (LOI) of 29.8% due to the appropriate phosphorus content of DAL- x with adjustable molecular chain structure. Moreover, the DAL- x /EP composite shows an unexpected improvement in the elastic modulus (∼36%) and well-preserved strength and ductility compared with those of pure EP. This work offers a feasible strategy for creating efficient bio-based flame retardants utilizing industrial waste lignin and preparing high-performance EP composites that meet the demanding requirement of fire retardancy in industries, contributing to the circular economy and sustainability.
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高影响因子
Crystals
·
2023
·Vol. 13
·期 6
·983
·
IF 2.7
Hao Zhao,Zishuai Jiang,Chengyu Wang,Yudong Li
The research on rapid and efficient detection of microplastics in water is still in its early stages. Fluorescence feature recognition represents an important and innovative approach to microplastic detection. While carbon quantum dots have been widely used in various environmental detection methods, their use for detecting microplastics in water environments has been rarely reported. In this study, N and Cl co-doped carbon quantum dots were synthesized via a hydrothermal method. The heteroatom doping process endowed them with blue luminescence properties, and their adsorption for microplastics was improved through the introduction of positive and negative charges and intermolecular forces. By utilizing a combined mechanism of fluorescence and Rayleigh scattering, the detection of polystyrene microplastics with three different particle sizes was achieved. In the detection process, it exhibits excellent light stability. Notably, the nano-polystyrene exhibited a good nonlinear relationship within the range of 0.01 g/L to 0.001 g/L, with R2values of 0.923 and 0.980 and a detection limit of 0.4 mg/L. These findings provide a novel approach for the detection of nano microplastics.Keywords:lignin;carbon quantum dots;co-doping;microplastic detection
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RSC Advances
·
2023
·Vol. 13
·期 24
·16352-16362
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IF 3.9
Shuyan Chen,Xueliang Li,Qin Lei,Yuhua Han,Xunping Zhou,Jianan Zhang
The objective of this study was to synthesize lignin carboxyl betaine zwitterionic surfactants (LCBS) from alkali lignin through a three-step reaction involving epoxidation, amination, and quaternization. The synthesized LCBS were characterized using infrared spectroscopy (IR) and thermogravimetric (TG) analysis. To assess their potential for enhanced oil recovery (EOR), the physicochemical properties of the LCBS surfactants, such as surface tension, emulsification, temperature resistance, salt resistance, and interfacial properties, were evaluated using standard experimental methods for surfactants applied in oil displacement. The LCBS surfactants exhibited higher surface activity, with low surface tension values ranging from 29.65 mN m−1 to 31.85 mN m−1 at the corresponding critical micelle concentration (cmc), also the significant emulsifying performance of LCBS surfactants was proved in the emulsifying experiments. Moreover, the synthesized LCBS surfactants were found to be suitable for use in harsh reservoirs of high-salinity and high-temperature, as confirmed by the temperature and salt resistance measurements. The interfacial tension (IFT) tests between Huabei crude oil and LCBS surfactants suggested that these surfactants could effectively extract the crude oil containing heavy components such as colloid and asphaltene, and ultra-low IFT values could be achieved with the addition of weak alkali.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Zhiqiang Shan,Xiaohua Jia,Yong Qiu,Jin Yang,Haojie Song
Combining wood matrix with thermosetting resin promises to be a new generation of resin-based friction material alternatives. Herein, regenerated lignin-cellulose (RLC) was prepared by waste wood, and precursor matrix slurry (EP@RLC) was obtained by mixing aqueous epoxy resin (EP) with RLC in different proportions. The impregnation and low-temperature curing processes were used to realize the combination of carbon fibers (CFs) and wood-plastic matrix. RLC filled the voids between CFs and adhered to their surfaces to build a CF-RLC reinforced structure, improving the surface roughness of the CFs/wood-plastic resin-based composite (CFs/EP@RLC) and enhancing the tensile strength and wear resistance. It has excellent mechanical strength with the tensile strength of up to 151.9 MPa, tensile modulus of up to 8.52 GPa, and toughness of up to 9.05 MJ/m 3 . In the tribological performance test, CFs/EP@RLC showed a stable friction coefficient (0.06) and low wear rate (0.64 mm), and no damage occurred at the interface of CFs after a long period of cyclic testing. In comparison with current research on resin-based friction materials, the CFs/EP@RLC meet the requirements in terms of mechanical and tribological properties. Besides, the CFs contained in end-of-life products can be easily recovered in hot alkaline solutions.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Tonghe Zhang,Bailiang Xue,Quan Yan,Yue Yuan,Jiaojun Tan,Ying Guan,Jialong Wen,Xinping Li,Wei Zhao
The increasing demand of less toxic and non-dangerous chemicals for material preparation has boosted the development of non-isocyanate polyurethanes (NIPUs). Lignin, as a kind of natural and sustainable polymer, has been employed to replace traditional petroleum-derived chemicals for NIPUs synthesis. In this work, novel lignin/NIPU hybrid polymers (LNIPUs) were facilely synthesized from lignin, bis(6-membered cyclic carbonate) (6CC) and polyetheramine. The yielded hybrid polymers not only possess distinctive mechanical and thermal performance, but also exhibit a wide variety of smart properties including shape memory, self-healing and reprocessability. In addition, the synthetic product LNIPUs show outstanding adhesive properties with an adhesive strength of up to 24.5 MPa obtained from the aluminum plates bonding. This work provides a convenient way to endow lignin-containing NIPUs with excellent properties and simultaneously opens up promising applications of the resultant materials.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Ruijin Li,Danlian Huang,Yashi Chen,Guangfu Wang,Zhen Wei,Wei Zhou,Ruihao Xiao
Selective oxidation of vanillyl alcohol (VAL) to vanillin (VN) is a key step towards sustainable valorization of lignin biomass. The combination of Cu metal and TEMPO has been shown to be an effective catalytic system for the oxidation of alcohols to aldehydes. However, most previous studies have stayed in homogeneous catalytic systems, where the catalysts are difficult to recycle. In this study, Carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) were utilized as the substrate, and the carboxyl functional groups could provide partial ligands for MOFs (Cu 3 (BTC) 2 ), thus allowing MOFs to be encapsulated by MWCNTs. And the hydroxyl group of 4-OH-TEMPO could be dehydrated and condensed with the carboxyl group to graft with carbon nanotubes to form a multiphase catalytic system. The addition of carbon nanotubes improved the stability and thermal conductivity of the catalyst, which was beneficial to the catalytic conversion of VAL. Under the conventional oven heating, the conversion of VAL and the selectivity of VN could reach 98.33% and 91.37% at 120 ℃ for 2 h, respectively. And under microwave radiation , the complete conversion of VAL to VN could be achieved at 120 ℃ for 1 h. After five cycles, the efficiency of the catalyst could still reach more than 85%, which proved to be a stable and reusable integrated catalyst for the oxidation of VAL to VN.
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International Journal of Environmental Research and Public Health
·
2023
·Vol. 20
·期 5
·4383
·
IF 4.614
Zheng Li,Yuwei Feng,Xia Qu,Yantao Yang,Lili Dong,Tingzhou Lei,Suxia Ren
Lignin is an ideal carbon source material, and lignin−based carbon materials have been widely used in electrochemical energy storage, catalysis, and other fields. To investigate the effects of different lignin sources on the performance of electrocatalytic oxygen reduction, different lignin−based nitrogen−doped porous carbon catalysts were prepared using enzymolytic lignin (EL), alkaline lignin (AL) and dealkaline lignin (DL) as carbon sources and melamine as a nitrogen source. The surface functional groups and thermal degradation properties of the three lignin samples were characterized, and the specific surface area, pore distribution, crystal structure, defect degree, N content, and configuration of the prepared carbon−based catalysts were also analyzed. The electrocatalytic results showed that the electrocatalytic oxygen reduction performance of the three lignin−based carbon catalysts was different, and the catalytic performance of N−DLC was poor, while the electrocatalytic performance of N−ELC was similar to that of N−ALC, both of which were excellent. The half−wave potential (E1/2) of N−ELC was 0.82 V, reaching more than 95% of the catalytic performance of commercial Pt/C (E1/2= 0.86 V) and proving that EL can be used as an excellent carbon−based electrocatalyst material, similar to AL.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiajia Guo,Syed Comail Abbas,Hai Huang,Zifeng Hua,Md Manik Mian,Shilin Cao,Xiaojuan Ma,Yonghao Ni
Developing highly efficient, sustainable carbon cathodes is essential for emerging Zn-ion hybrid supercapacitors (ZICs). Herein, lignin's novel chemical modification (amination) has been developed to produce high quantity pyrrolic-N moieties as active sites. Furthermore, chemically modified amine moieties in lignin are vital as a natural self-activating template to generate hierarchical porosity in the 2D (graphene-like) architecture with exceedingly high surface area (2926.4 m 2 g −1 ). The rationally introduced dominated pyrrolic-N moieties boost the Zn-ion storage capacity and reaction kinetics due to the dual energy storage mechanism and efficient charge transfer between pyrrolic-N and Zn +2 ions. Furthermore, the pyrrolic-N species are energetically favorable for the adsorption of Zn +2 ions by the formation of N -Zn +2 chemical bonds. Besides, the nitrogen oxides reduce the intrinsic resistance and induce a more polarized surface, resulting in high wettability and efficient transfer of electrolytes into the pores of hydrophobic carbon materials . Subsequently, the chemically modified lignin-derived activated carbon material (Chem-ACM) as a cathode in ZICs delivers a high capacity of 161.2 mA h g −1 at 1 A g −1 with the admirable energy density of 106.7 W h kg −1 at 897 W kg −1 and excellent retention capacity (94%) after 10,000 cycles. Mainly, the assembled quasi solid-state ZICs using Chem-ACM retains the remarkable storage capacity (202 mA h g −1 at 0.2 Ag −1 ) even at a high bending angle. Notably, the Chem-ACM has been further employed in symmetric supercapacitors as an electrode, and it displays exceptional specific capacitance of 354 Fg −1 at 0.5 Ag −1 with tremendous energy (43.5 W h kg −1 ) and the power density (0.53 kW kg −1 ). Additionally, the charge storage capability of Chem-ACM is positively dependent on high nitrogen contents, and it is extrapolated that pyrrolic-N moieties are dominant active sites. Hence, the designed amination-assisted biocarbon synthesis provides a new way to prepare high nitrogen-containing biocarbon for ZICs and further understand pyrrolic-N species' impact on Zn-ion storage.
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Reaction Chemistry & Engineering
·
2023
·Vol. 8
·期 7
·1673-1683
·
IF 3.9
Zhen Wu,Hongli Bai,Yifan Ji,Tao Wang,Zihe Zhao,Yetao Jiang,Xiaoyu Wang,Jiaxing Xu,Aiyong He,Sheng Chen,Lei Hu
Lignin valorisation is hindered by intrinsic difficulties. The breaking of the anti-degradation barrier of lignin for the transformation of lignin has become a hot topic in current research. In the present work, the carbon-nitride-supported molybdenum catalyst (Mo/CN) was synthesised by a two-step method from ammonium molybdate and dicyandiamide and used for the enhancement of lignin depolymerisation to produce high-value phenols. The SEM, TEM, XPS, XRD and FT-IR results of Mo/CN confirmed that the two-step method is advantageous for the high dispersion of MO nanoparticles on the CN carrier. The CN and various CN-supported metal catalysts were examined carefully to evaluate their catalytic activities for kraft lignin conversion, and this indicated that the loading of molybdenum on CN was a favourable method for the catalytic depolymerisation of kraft lignin. A depolymerisation residue yield of 4.33%, tetrahydrofuran-soluble products (TSPs) yield of 61.6%, and a monomer yield of 23.4% could be obtained when kraft lignin depolymerisation was performed on 2% Mo/CN in 50% ethanol at 220 °C for 2 h. High-value phenols such as butylated hydroxytoluene (BHT) and 4-propylguaiacol dominated the depolymerisation products. Moreover, the synthetic catalyst presents good applicability for different industrial lignins. To understand the role Mo/CN played in the degradation of lignin, a β-O-4 type lignin dimer 2-(2-methoxyphenoxy)-1-(4-methoxyphenyl)ethenone was used as a model, and the degradation pathways of the model based on Mo/CN are proposed.
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Journal of Energy Storage
·
2023
·
IF 9.4
Yukang Fan,Fangbao Fu,Dongjie Yang,Weifeng Liu,Zhixian Li,Xueqing Qiu
Carbon-based supercapacitors are prospective candidates for next-generation energy storage systems . However, there remains challenges in the development of high volumetric capacitance carbon electrodes. Herein, nitrogen-enriched lignin-derived porous carbons (NLSCs) were fabricated by co-pyrolysis of sodium lignosulfonate with zinc oxalate and melamine via an efficient nitrogen doping strategy. The in-situ generation of zinc cyanamide (ZnNCN) achieves a high nitrogen conversion rate of 13.5 %, much higher than that of ZnCl 2 activation (1.9 %), and endows the optimized NLSC-800 an extremely high nitrogen doping (14.47 at.%), abundant edged nitrogen species, and a high bulk density (1.26 g cm −3 ), contributing to substantially improved surface property and boosting pseudocapacitance . Consequently, the NLSC-800 supercapacitor electrode delivered a high gravimetric capacitance of 300 F g −1 and superior volumetric capacitance of 378 F cm −3 . More remarkably, the symmetric supercapacitor assembled by NLSC-800 performs an exceptional volumetric energy density of 5.1 Wh L −1 at 173.0 W L −1 . The capacitance retention rate is 97.6 % over 20,000 charge/discharge cycles at 2.0 A g −1 , exhibiting outstanding cycling stability. This strategy suggests a novel route for fabricating nitrogen-doped biomass-derived carbon for supercapacitors with balanced the gravimetric and volumetric capacitance.
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CARBOHYDRATE POLYMERS
·
2018
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IF 5.158
Xuliang Lin,Linjun Wu,Siqi Huang,Yanlin Qin,Xueqing Qiu,Hongming Lou
The origin, amount, hydrophilicity, charge, molecular weight and its distribution of lignin have significant influences on the enzymatic hydrolysis of lignocellulose. The enzymatic hydrolysis of lignocellulose was essentially enhanced by lignin-based polyoxyethylene ether (EHL-PEG), whereafter followed by PEG4600 and lignosulfonate (LS). The effect of LS, EHL-PEG and PEG4600 on the adsorption and enzymatic hydrolysis kinetics of cellulase on the gold surface and cellulose film was investigated by Quartz Crystal Microbalance with dissipation monitoring (QCM-D). Results showed that the interaction of LS or EHL-PEG with cellulase was electrostatic attractive and hydrophobic effect, respectively, and formed hydrophilic cellulase aggregates. LS-Cellulase peeled off the cellulose film layer by layer, while the hydrophobic phenylpropane structure of EHL-PEG-Cellulase acted as a cellulose binding domain to hydrolysis cellulose through “Hollow” effect and made cellulose become more loose and swollen. At last, a strategy to enhance the enzymatic hydrolysis of lignocellulose by lignin-based amphiphilic polymers was proposed as well.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2019
·Vol. 36
·期 7
·1042-1050
·
IF 2.476
Wang Shuai,Lyu Li,Sima Guobao,Cui Ying,Li Baoxia,Zhang Xueqin,Gan Linhuo
A sulfonated lignin-derived mesoporous carbon (LDMC-SO 3 H) was prepared from kraft lignin (KL) using phenolation and soft-template method followed by sulfonation. LDMC-SO 3 H bearing a sulfonic acid density of 0.65 mmol/g possessed a well-ordered 2D hexagonal mesoporous characteristics with mesopore volume of 0.067 cm 3 /g and specific surface area of 262 m 2 /g as well as mesopore size of 3.42 nm. A high 5-hydroxymethylfurfural (5-HMF) yield of 98.0% with a full fructose conversion was obtained using LDMC-SO 3 H as catalyst under the optimized reaction conditions of reaction temperature and time of 140 °C and 120 min, initial fructose concentration of 100 g/L, catalyst load of 0.1 mg/mg in DMSO. Furthermore, there was no obvious decrease in 5-HMF yield (≥95.0%) within the five-cycle experiment, highlighting the superior reusability and stability of LDMC-SO 3 H in fructose-to-5-HMF transformation.
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危险品化学品经营许可证（带存储）