ENERGY & FUELS
·
2020
·
IF 3.421
Jun Hu,Mingxing Zhao,Bingxing Jiang,Shiliang Wu,Ping Lu
Direct hydrogenolysis of native lignin in biomass into monomeric phenols has received increasing attention. In this work, catalytic transfer hydrogenolysis of native lignin from birch, pine, and corn stalk was studied over a Ni–Pd bimetallic catalyst using isopropanol as the in situ hydrogen source. The bimetallic Ni50Pd50/SBA-15 exhibited higher activity than the monometallic counterparts in catalytic transfer hydrogenolysis of native birch lignin, affording 37.2 wt % monophenols at 245 °C after 4 h. 4-Propylsyringol had the highest yield of 18.9 wt % with a selectivity of 51%. Among the three biomass feedstocks, native lignin in birch gave the highest monophenol yield, which is 2.2 times that of native pine lignin (16.9 wt %) and 4.6 times that of native corn stalk lignin (8.1 wt %). FTIR and Py–GC MS analyses of the starting biomasses and the depolymerization solid products revealed that native birch lignin has the highest depolymerization efficiency with the least active lignin remaining.
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Linlin Fan,Zhiqiang Shi,Qingjuan Ren,Lei Yan,Fuming Zhang,Liping Fan
Nitrogen-doped lignin-based carbon microspheres are synthesized using 3-aminophenol as a nitrogen source by the hydrothermal method. The structural change and the effect on the electrochemical properties are systematically investigated. Nitrogen-doped lignin-based carbon microspheres represent well-developed spherical morphology with many active sites, ultramicroporous (< 0.7 nm) structure, and large interlayer spacing. Consistent with the obtained physical structures and properties, the nitrogen-doped carbon microspheres exhibit fast sodium ion adsorption/intercalation kinetic process and excellent electrochemical performance. For example, a reversible specific capacity of 374 mAh g −1 at 25 mA g −1 with high initial coulombic efficiency of 85% and high capacitance retention of 90% after 300 cycles at 100 mA g −1 and stable charge/discharge behavior at different current density is obtained. The additional defects and abundant ultramicroporous structure can enhance sloping capacity, and large interlayer spacing is considered to be the reason for improving plateau capacity.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Yi Meng,Tanglong Liu,Shanshan Yu,Yi Cheng,Jie Lu,Haisong Wang
A lignin-based carbon aerogel enhanced by graphene oxide (LCAGO) is fabricated. As the strong reaction between amine groups from lignin derivates and carboxylic groups from GO and acrylic acid (AA), the compactness and the cross-linkage of the gel are much higher than the samples without lignin derivate and GO. The lignin derivates are used as cross-linkers and GO contributes to reach to superhydrophobicity with a low annealing temperature and improves the mechanical performance after annealing. The carbon aerogel achieves a water contact angle of 150° at 350 °C for 2 h, achieving the energy-saving purpose. The synergistic effect of superhydrophobicity and good mechanical property acquired by lignin derivate and GO ensures the carbon aerogel appropriate for oil/water separation and light oil, heavy oil and emulsified oil are separated respectively by the gel. The oil adsorption ratio is about 32–34 g/g and shows a moderate performance, which is compared with the reported biomass-based materials. The results indicate the material is a highly effective and practicable water-cleaning material. The preparation process is energy-saving and is a pathway for separation and collection oil from water with industry waste.
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2020
·
IF 6.092
Yijie Zhou,Yong Qian,Jingyu Wang,Xueqing Qiu,Hongbo Zeng
UV filters that contain one or two aromatic rings in conventional sunscreens generally have a poor photo- and thermal stability and can easily penetrate through stratum corneum and dermis into the blood vessel, thus causing potential health-threatening issues. Herein, a series of bioinspired photostable and biocompatible polydopamine-grafted lignin (AL-PDA) with strong bioadhesion have been synthesized through free radical addition of dopamine (DA) and alkali lignin (AL). AL-PDA was used to emulsify organic UV filters and further cross-linked to form nanocapsules through ultrasonic cavitation. The retention rate of optimal AL-PDA nanocapsules on the skin surface reached 87% after a thorough rinse with water and negligible penetration was observed, which demonstrates their excellent bioadhesion property. Force measurements using atomic force microscopy (AFM) quantitatively revealed the adhesion between the nanocapsules and skin. An average DA grafting number of 4 would be required to endow the AL-PDA nanocapsules with suitable water-penetration resistance. The nanocapsules were used as the sole active ingredient for formulating sunscreen, whose sun protection factor (SPF) value could reach 195.33 with a dosage ∼10 wt % lasting for over 8 h under UV radiation. The as-prepared nanocapsules possess excellent antioxidant capacity and biocompatibility, ensuring their superior performance and safe use in the sunscreen. This work provides new insights into the development of biomass lignin for advanced function materials and high-end products.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Lixia Li,Juanhua Kong,Huimin Zhang,Sijie Liu,Qiang Zeng,Yaqin Zhang,Hao Ma,Hongyan He,Jinxing Long,Xuehui Li
The catalytic depolymerization process for lignin to produce value added chemicals is often challenged by the limited mass transfer over heterogeneous catalysts, the complex aromatic biopolymer structures, and the high recalcitrance of C C bonds. Herein, a series of hierarchical MFI nanosheets (MFI-ns) supported metal oxide catalysts have been designed and used for the selectively oxidative cleavage of organosolv lignin. As expected, 81.6 % conversion of lignin can be achieved over 15Ce-5Cu/MFI-ns with 294.0 mg g −1 yield of volatile products, including 180.9 mg g −1 of diethyl maleate. Quantum chemistry calculation coupled with static adsorption measurements shows that the superior catalytic activities of these catalysts are ascribed to the favorable mass transport of lignin to the active sites by the unique layer structure, and the hierarchical pore sizes distribution, as well as the electronic effect between Cu and Ce components. In addition, the catalytic mechanism for the cleavage of C C bonds in β -O-4 model probes has been studied via the controlled oxidative degree of model compounds and the isotope-labeling experiments. Therefore, this work provides a new insight into the efficient utilization of lignin via the rational design of catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 44
·49354
·
IF 2.52
Xin Ge,Mingming Chang,Wei Jiang,Bangwen Zhang,Ruiguang Xing,Chaoke Bulin
In this work, biodegradable lignin/poly(lactic acid) (PLA) blends were prepared with melting compounding method. Dicumyl peroxide (DCP) and maleic anhydride (MA)/biphenyl peroxide (BPO) were used for the modification of the polymer blends, respectively. Structure of the polymer blends was characterized with Fourier transformed infrared spectroscopy and field emission scanning electron microscopy. Mechanical properties of the samples were determined with universal test machine and dynamic mechanical analysis. Thermal behaviors and thermal stability of the blends were all characterized with a thermal gravimetric analysis/differential scanning calorimetry simultaneous thermal analyzer. Lignin reinforced the mechanical strength of the blends while the thermal stability was not improved. At low content, DCP and MA/BPO apparently enhanced the mechanical strength of lignin/PLA blends. However, excessive DCP led to decreased tensile strength and elongation at break. Both DCP and MA/BPO resulted in lower glass transition temperature and melting temperature of PLA in the blends, while the thermal stability of the polymer blends was poorer after modification.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Shuo Lu,Dongjie Yang,Miao Wang,Mengzhen Yan,Yong Qian,Dafeng Zheng,Xueqing Qiu
The pH-responsive O/W Pickering emulsions were stabilized by amphoteric lignin (AML) absorbed with SiO 2 nanoparticles via electrostatic interaction. AML was gained by quaternary ammonium modification of alkali lignin, and its structure was characterized by 1 H NMR. Fourier transform infrared spectroscopies and Zeta potential measurements were performed to investigate the interaction between AML and SiO 2 . The formed AML@SiO 2 compounds were utilized to prepare Pickering emulsions. The influences of AML concentration and pH on emulsions were studied by rheological measurements and Turbiscan Lab Expert stability index system. The pH-responsive mechanism of Pickering emulsions was investigated by Zeta potential, quartz crystal microbalance with dissipation, atomic force microscopy and three-phase contact angle. The results indicated that at the pH range of 3-4, AML was absorbed on SiO 2 to realize the in-situ hydrophobization of SiO 2 , forming stable Pickering emulsions. When pH was above 4, only a little amount of AML was absorbed on SiO 2 due to the strong electrostatic repulsion between them, resulting in unstable emulsions. The emulsions could be cycled at least 5 times between emulsification and demulsification as well as exhibited excellent salt tolerance.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fangbao Fu,Dongjie Yang,Wenli Zhang,Huan Wang,Xueqing Qiu
Two-dimensional porous carbon materials are very promising for energy storage/conversion due to their unique microstructure, reasonable pore structure and excellent electrochemical properties. A green and facile in-situ carbonization technique is innovated to prepare a unique porous lignin-derived carbon quasi-nanosheets (PLC) with rational pore distribution, large surface area, and excellent conductivity. The lignosulfonate/zinc oxalate composite was firstly self-assembled by hydrophobic bond of the amphiphilic structure in lignosulfonate using ethanol/water solvent without the need to use any toxic material, followed by co-pyrolysis at a high temperature with gas-exfoliation and in-situ templating of zinc oxalate. The resulting PLC exhibits a very high specific capacitance of 320 F/g at 1.0 A/g and long cycling stability (remains 93.5% after 10,000 cycles at 5.0 A/g). In addition, when assembling into symmetric supercapacitors in PVA/KOH gel electrolytes, PLC also shows a high specific capacitance of 274 F/g at 0.5 A/g with excellent rate capability and a high specific energy density (9.75 W h/kg at 6157.9 W/kg). These excellent electrochemical performances indicate that the as-prepared PLC should hold great promise for the energy storage devices, opening a new path for the preparation of advanced carbon electrode material and high-value-added utilization of biomass.
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Yong Qian,Yijie Zhou,Lan Li,Weifeng Liu,Dongjie Yang,Xueqing Qiu
Aromatic skeleton and polyhydroxyl structure endow biomass lignin with excellent dispersibility, reactivity, and UV-blocking property. Herein, spherical microcapsules loaded with isophorone diisocyanate (IPDI) as core materials were prepared via interfacial polymerization in an oil-in-water emulsion, using sodium lignosulfonate (NaLS) as an emulsifier. Small amount of polydiphenylmethane diisocyanate (PMDI) was added to reinforce the shells of the capsules. The results show that the capsules were 43.4–118.3 μm with a shell thickness of 1.9–2.5 μm. The core fraction was approximately 72.6 wt% and the functional groups of IPDI, such as cyanates, were well preserved. The NaLS-based microcapsules were subsequently mixed and reacted with hexamethylene diisocyanate (HDI) and amine component successively to form new polyurea. When the new polyurea was coated on a steel substrate, it exhibited excellent self-healing property after being scratched. The healed polyurea presents nearly the same anticorrosion ability as the unscratched coating in a solution with high salt concentration. Moreover, the addition of NaLS-based capsules could effectively slow down the aging process of polyurea coatings. The color change of the self-healing polyurea leveled off after 200 h of UV irradiation, while retaining 40% of the breaking strength and 50% of elongation at break. Comparatively, the color of pure polyurea deepened continuously and the mechanical property disappeared completely.
✓ 已验证
产品关联
DOI
高影响因子
Agronomy-Basel
·
2023
·Vol. 13
·期 10
·2641
·
IF 3.7
Mingyang Li,Gaoyang E,Conghui Wang,Ruolin Shi,Junxi Wang,Shuo Wang,Yu Wang,Qi Chen,Zeli Li,Zhiguang Liu
Conventional potassium chloride granules have inefficient applications in agricultural production due to particle irregularity and low fluidity. The application of controlled-release potassium chloride could increase the potassium-use efficiency and alleviate the shortage of potassium ore resources. In this study, a well-rounded potassium chloride fertilizer core was prepared, using the graft modification of polyurea to enhance the coating rate and release performance. The adhesive and tensile characteristics of the modified polyurea binder, as well as the granule properties of modified polyurea binder potassium chloride, were studied to determine the ideal lignin-grafted ratio. The effect of the modified polyurea binder with potassium chloride on the properties of coated fertilizer was investigated. The findings, shown by radar maps of the binder’s properties, demonstrated that the ideal mass ratio of the modified lignin polyurea binder to urea is 1:2. The Fourier-transform infrared spectroscopy results demonstrated that the amino functional groups of lignin were enhanced, improving the product’s interfacial compatibility with the polyurea matrix. Compared to humic acid (HA; 12%) and bentonite (Ben; 30%) treatments, the granule intensity of the 9.9%—1:2 treatment considerably increased by 139.10% and 38.86%, respectively, while the static angle of the granules reduced by 16.67% and 3.81%. The 28-day cumulative release rate of the modified polyurea (9.9%—2:1) with a 5% coating thickness was the lowest (28%), 42% lower than that of the lowest conventional treatment. In summary, the creation of a bio-lignin polyurea binder under the optimum conditions reduced the need for petrochemical-based materials, allowed the preparation of fertilizer with granules of increased fluidity, and enabled the successful coating of a high-salt potassium fertilizer, offering a novel technique for the high-value application of potash fertilizer coating.Keywords:lignin;modified polyurea;binder;potassium chloride;controlled-release fertilizer
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Minghui Cui,Shuqi Li,Xiaozhen Ma,Jinggang Wang,Xiaolin Wang,Nathan E. Stott,Jing Chen,Jin Zhu,Jing Chen
Conventional antibiotic therapies have been becoming less efficient due to increasingly, and sometimes fully, antibiotic-resistant bacterial strains, sometimes known as “superbacteria” or “superbugs.” Thus, novel antibacterial materials to effectively inhibit or kill bacteria are crucial for humanity. As a broad-spectrum antimicrobial agent, silver nanoparticles (Ag NPs) have been the most widely commercialized of biomedical materials. However, long-term use of significant amounts of Ag NPs can be potentially harmful to human health through a condition known as argyria, in addition to being toxic to many environmental systems. It is, thus, highly necessary to reduce the amount of Ag NPs employed in medical treatments while also ensuring maintenance of antimicrobial properties, in addition to reducing the overall cost of treatment for humanitarian utilization. For this purpose, naturally sourced antimicrobial polylysine (PL) is used to partially replace Ag NPs within the materials composition. Accordingly, a series of PL, Ag NPs, and lignin-based polyurethane (LPU) composite biofoams (LPU-PL-Ag) were prepared. These proposed composite biofoams, containing at most only 2 % PL and 0.03 % Ag NPs, significantly inhibited the growth of both Gram-positive and Gram-negative bacteria within 1 h and caused irreversibly destructive bactericidal effects. Additionally, with a layer of polydimethylsiloxane (PDMS) on the surface, PDMS-LPU-PL(2 %)-Ag(0.03 %) can effectively prevent bacterial adhesion with a clearance rate of about 70 % for both bacterial biofilms within three days and a growth rate of more than 80 % for mouse fibroblasts NIH 3 T3. These lignin-based polyurethane biofoam dressings, with shorter antiseptic sterilization times and broad-spectrum antibacterial effects, are extremely advantageous for infected wound treatment and healing in clinical use.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Wei Liu,Chuang Jiang,Xiaoyu Li,Haoyu Li,Yu Zhang,Yi Huang,Shangqing Chen,Qingxi Hou
Deep eutectic solvents (DES) have been regarded as green solvents in the biorefinery of lignocellulosic biomass, but long duration time has severely limited efficiency. The microwave-assisted DES pretreatment along with enzymatic hydrolysis and high-pressure homogenization process was proposed to produce lignin-containing cellulose nanofibrils (LCNF) from corncob. Benefiting from microwave-assisted DES pretreatment, the duration time was greatly shortened; meanwhile the effects of different kinds of DES on the resultant LCNF were investigated. The results showed that, the microwave-assisted DES fabricated LCNF (M-LCNF) was successfully obtained, exhibiting good nano size, thermal stability , colloidal stability, and fluorescence. M-LCNF was further introduced into phytic acid (PA) enhanced poly(acrylamide- co -acrylic acid) (P(AM-co-AA)) network and constructed composite conductive hydrogels (PLP). The obtained hydrogels exhibited good mechanical strength , UV blocking ability, fluorescence, and conductivity. A simple battery assembled with the resultant PLP as electrolyte had an out voltage of 2.41 V. The composite conductive hydrogel showed good sensing performance towards different stimuli (e.g., stretching and compression) and human motions in real time. It is expected that this research would provide an alternative way for green fabrication of LCNF and potential application of LCNF in flexible sensors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）