INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Shubo Wang,Yuan Lin,Jian Yang,Lei Shi,Guang Yang,Xupin Zhuang,Zhenhuan Li
Metal–organic frameworks (MOFs) exhibit high proton conductivity , thermal stability, and offer immense flexibility in terms of tailoring their size. Owing to their unique characteristics, they are desirable candidates for proton conductors . Nevertheless, constructing ordered MOF proton channels in proton exchange membranes (PEMs) remains a formidable challenge. Herein, blend nanofibers of cellulose and UiO-66-NH 2 (Cell–UiO-66-NH 2 ) obtained via the electrospinning process were embedded in a sulfonated polysulfone matrix to obtain high-performance composite PEMs with an orderly arrangement of UiO-66-NH 2 . Comprehensive characterization and membrane performance tests reveal that composite membrane with 5 wt% (nominal) UiO-66-NH 2 have revealed high proton conductivity of 0.196 S cm −1 at 80 °C and 100% relative humidity. Meantime, the composite membrane exhibits a low methanol permeability coefficient (~5.5 × 10 −7 cm 2 s −1 ). Moreover, the composite membrane exhibits a low swelling ratio (17.3%) even at 80 °C. The Cell–UiO-66-NH 2 nanofibers exhibit strong potential for use as a proton-conducting nanofiller in fuel-cell PEMs.
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yueqin Li,Qiang Gong,Xiaohui Liu,Zongbiao Xia,Yong Yang,Chen Chen,Changhao Qian
Herein, we report a simple approach to fabricate PANI/cellulose/PAAM conductive hydrogels with interpenetrating structure by in-situ polymerization of PANI into the acid tolerant cellulose/PAAM hydrogel. The obtained conductive hydrogels not only can achieve high flexibility and excellent conductivity, but also can be directly sandwiched between carbon clothes to fabricate all-in-one configured supercapacitors . Such supercapacitors show excellent electrochemical performances with a large areal capacitance of 835.0 mF/cm 2 (corresponding to 4.175 F/cm 3 ), a high energy density of 74.22 μWh/cm 2 and an enhanced cycling performance with 96% capacitance retention after 5000 cycles. What's more, the supercapacitors can withstand large bending/compressing deformations and wide temperature-tolerant from −60 to 80 °C. In addition, the PANI/cellulose/PAAM hydrogels can be fabricated into wearable motion sensors to monitor various human movements, such as finger bending and pressing, subtle clenching fist, swallowing and phonation in real-time. The obtained multifunctional performances may provide intriguing opportunities for practical applications.
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PubMed
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2021
·
IF 5.89
Ou Zhiqiang,Zhou Qi,Rao Xin,Yang Haifeng,Huo Chunqing,Du Xueyu
Waste rubber wood (RW) is the castoff of rubber plantation with abundant reservation but without high-value utilization. In this study, cellulose with high purity has been efficiently isolated from waste RW and further processed into cellulose nanocrystals. By means of acetylation, more hydrophobic cellulose-based products, namely acetylated rubber wood cellulose (Ac–RWC) and acetylated rubber wood cellulose nanocrystals (Ac–RW–CNC) had been attempted as reinforcing fillers for fabricating two series of PLA-based composite films via spin coating instead of currently prevailing melt compounding technique. To ensure a uniformed dispersion of fillers in PLA matrix, the addition of reinforcing filler should be equal to or less than 5% based on the film dry weight. Compared with pure PLA film, the Ac–RWC reinforced PLA composite films are more thermally stable, while the Ac–RW–CNC reinforced PLA composite films on the other hand exhibit more enhanced performance in mechanical properties and the degree of crystallinity. The highest tensile strength (55.0 MPa) and Young’s modulus (3.9 GPa) were achieved for 5%Ac–RW–CNC/PLA composite film.
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高影响因子
TALANTA
·
2021
·
IF 6.057
Jia Liu,Hai-Xia Zhang,Yan-Ping Shi
With a dramatic increase in the incidence of obesity, it is significant to screen lipase inhibitors from traditional herbal medicines as drugs to treat obesity. Lipase inhibitors currently used to treat obesity possess the defects of toxicity and off-target effects. Thus, there is an urgent need to explore more safe, effective and targeted anti-obesity drugs from traditional herbal medicines. In this work, amino functionalized magnetic cellulose microsphere was employed as a novel support to immobilize lipase through covalent bonding. Characterizations from fourier transform infrared spectroscopy, transmission electron microscopy and X-ray diffraction demonstrated the successful preparation of the support. In comparison with the free lipase, the immobilized lipase manifested the excellent properties of a wider range for pH and temperature endurance, better pH, thermal, storage stability and reusability. Through investigating the kinetics performances of the immobilized lipase, the Michaelis-Menten constant was calculated to be 2.05 mM and its inhibition constant for orlistat was ascertained to be 40.74 μM. Eventually, the established strategy was applied to screen lipase inhibitors from 7 traditional herbal medicines and Crataegus pinnatifida Bunge was screened out due to its significant lipase inhibitory activity. To sum up, our newly established method not only developed a platform for efficiently discovering novel anti-obesity drugs from traditional herbal medicines, but also laid a solid foundation for successfully exploring undiscovered medicinal value of the traditional herbal medicines.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 17
·10999-11011
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IF 5.044
Si Rongrong,Wu Chaojun,Yu Dongmei,Ding Qijun,Li Ronggang
Abstract In this study, environmentally friendly TEMPO-oxidized cellulose nanofiber (TO-CNF)/polyvinyl alcohol (PVA)/polyethyleneimine (PEI) nanoparticles were obtained by assembling PEI into TO-CNF/PVA aerogel, which was prepared by freeze-drying method with the help of glutaraldehyde. FTIR results showed that PEI likely assembled into the TO-CNF/PVA aerogel due to appearances of bending vibration of the TO-CNF/PVA/PEI nanoparticles at 1615 cm −1 . BET results further demonstrated that PEI have successfully assembled into the aerogel since the specific surface area (22.93 m 2 /g) of TO-CNF/PVA /PEI nanoparticles was lower than that (56.37 m 2 /g) of TO-CNF/PVA aerogel. SEM results also showed that PEI could obviously regulate the morphology of TO-CNF/PVA aerogel. TGA indicated that TO-CNF/PVA/PEI nanoparticles were structurally stable at 216.4 °C. The adsorption kinetics of the TO-CNF/PVA/PEI nanoparticles for copper ion (Cu 2+ ) removal presented good correlations with the Pseudo-second-order kinetic and Langmuir model ( R 2 > 0.99). Its maximum adsorption capacity for Cu 2+ according to Langmuir model was 156.8 mg/g. The adsorption equilibrium could reach in near one hour, and the adsorption efficiency could still maintain more than 80% after 3 cycles. Graphic abstract
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Fang Wang,Jiarui Li,Cheng Chen,Hong Qi,Kexin Huang,Sheng Hu
Chemo-photothermal combination therapy has great promise for enhanced tumor treatment. Hereby, we developed a complex nanoparticle using electrostatic absorption method, in which the inner chitosan (CS) NPs loaded polypyrrole (PPy) nanoparticles and 5-fluorouracil (5Fu), the outer shell was carboxymethyl cellulose (CMC) crosslinked with disulfide . The drug loaded polysaccharide complex nanoparticles displayed good photothermal effects, and the drug release would be triggered by multi-model response of NIR irradiation, high glutathione (GSH) and weak acidity in tumor environment. In vitro biological studies indicated the nanopartiles could be effectively internalized by HepG2 cancer cells. Moreover, the remarkable inhibition of the CMC complex PPy and 5Fu loaded CS nanoparticles (CMC/ [email protected] + 5Fu NPs) against tumor growth was achieved in HepG2-bearing mice model, suggesting its great potential for synergetic chemo-photothermal therapy.
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高影响因子
Nanoscale
·
2021
·Vol. 13
·期 42
·17837-17845
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IF 7.79
Lumin Chen,Houyong Yu,Ziheng Li,Xiang Chen,Wenlong Zhou
Carbon materials are highly promising electrode materials for supercapacitors, due to their hierarchical porous structure and large specific surface area. However, the limited specific capacitance and inferior rate capability significantly prevent their practical application. Herein, 3D interconnected hierarchical porous carbon aerogels (CNFAs) through engineering the pyrolysis chemistry of CNF are developed. The obtained CNFAs effectively improve the carbon yield and suppress the volume shrinkage, as well as have robust mechanical properties. As a supercapacitor electrode, the CNFAs-17% electrode exhibits an ultrahigh capacitance of 440.29 F g−1 at 1 A g−1, significantly superior to most reported biomass-based carbon materials. Moreover, the CNFAs-17% assembled symmetric supercapacitor (SSC) achieves an outstanding rate capability (63.29% at 10 mA cm−2), high areal energy density (0.081 mWh cm−2), and remarkable cycling stability (nearly 100% capacitance retention after 7000 cycles). This work offers a simple, effective strategy towards the preparation of promising electrode materials for high-performance energy storage applications.
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PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Xue Yao,Sufeng Zhang,Liwei Qian,Min Du
Surfaces engineered to identify and enrich glycoproteins are of considerable interest in the diagnostic and detection fields. A boronate affinity (BA) material was proposed as a potential candidate for the isolation of glycoproteins. However, this material has the disadvantages of low efficiency and non-degradability. Herein, a novel dendrimer-amplified BA cellulose foam (PEI-PBA-CF) was fabricated via a mild two-step approach. The as-prepared PEI-PBA-CF exhibited a rapid adsorption equilibrium rate (within 60 min) and outstanding adsorption capacity for horseradish peroxidase (537.4 mg g −1 ) and ovalbumin (495.5 mg g −1 ). Furthermore, competitive adsorption experiments demonstrated that PEI-PBA-CF could achieve selective separation and purification of glycoproteins from complex biological samples due to the synergistic effect of the improved BA capacity by the dendrimer and the well-interconnected porous structure of the biomass matrix. Consequently, these cellulose foams might present new application opportunities in analytical and biomedical fields.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Zhaorong Zhang,Tuxiang Guan,Xiaoyan Zhang,Liming Shen,Ningzhong Bao
Graphene fibers have great potential in yarn supercapacitors (YSCs) because of their good strength, flexibility, electrical conductivity, and ultrahigh specific surface area. Among the reported results, graphene fibers show higher capacitance properties, but their mechanical strength is relatively low. Here, we design a simple method to prepare high-performance graphene fibers with high strength and high capacitance by adding carboxymethyl cellulose (CMC) to graphene oxide (GO). The hydrogen bonding network between GO and CMC greatly improves the strength of the fiber. CMC can greatly improve the hydrophilicity of the graphene fiber, reduce the stacking of graphene sheets, increase the effective active area, and thus increase the capacitance. The as-prepared rGO–CMC fiber shows a high strength of 526.4 MPa, and the capacitance of YSCs reaches 197.7 mF/cm2.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 10
·6481-6498
·
IF 5.044
Lang Daning,Shi Ming,Xu Xia,He Shixue,Yang Chao,Wang Lu,Wu Ronglan,Wang Wei,Wang Jide
Abstract 4-Nitrophenol is a highly toxic environmental pollutant. It is a challenge to selectively remove it from a mixture of various pollutants. Herein, we report a study on the selective adsorption of 4-nitrophenol by using molecularly imprinted polymers (MIPs). The imprinted polymer was synthesized using cellulose as a framework, onto which, the complex of the imprinting molecule (i.e., 4-nitrophenol) and a candidate material [namely, 2-(dimethylamino)ethyl methacrylate. DMAEMA] was grafted. The obtained MIP showed an excellent adsorption capacity with good selectivity. Also, the adsorption of 4-nitrophenol by the obtained MIP was fast and the adsorbent exhibited good recyclability. The thermodynamics and kinetics of the adsorption process of 4-nitrophenol by MIP was thoroughly studied, where an otherwise-equivalent non-imprinted polymer was used as a control in the experiments. The selectivity of the MIP adsorbent for 4-niteophenol was evaluated by two types of experiments: (1) adsorption experiments in single-component adsorbate systems (containing 4-nitrophenol, 3-nitrophenol, catechol, or hydroquinone), and (2) competitive adsorption experiments in binary adsorbate systems (containing 4-nitrophenol plus either 3-nitrophenol, catechol or hydroquinone). The selectivity coefficient for 4-nitrophenols was twice of those of other phenols (that were all around 2), indicative of the extent of the affinity of MIPs to these phenolic compounds. The recyclability of the adsorbent was evaluated for 5 adsorption–desorption cycles, where the adsorption capacity of the last cycle remained over 90.2% of that of the first cycle. Graphic Abstract
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 9
·5421-5431
·
IF 5.044
Qiao Liangzhi,Liang Chao,Du Kaifeng
Carbon nanotubes (CNTs) have been proposed as next-generation lightweight structural materials, yet their application is facing challenges due to the poor dispersity in most solvents, especially in aqueous solution. Here, we report a facile and robust strategy for the rapid and scalable preparation of homogeneous and stable CNT dispersion assisted by cellulose in NaOH/thiourea aqueous solution. The whole process only needs a mild stirring procedure at ice-bath without any pre-treatment of raw materials. It is demonstrated that the suitability of the CNT dispersion for aqueous self assembly of various functional materials, ranging from zero-dimensional (0D) microsphere to three-dimensional (3D) monolith through various molding techniques. Also, the CNT dispersion can be used as ink to prepare CNT-based paper and textile through simply dyeing commercial filter paper and textile, and to directly write on the paper by syringe, indicating the great potential for flexible and wearable devices.
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高影响因子
CHINESE CHEMICAL LETTERS
·
2021
·
IF 6.779
Mingfu Luo,Meng Wang,Huaipeng Pang,Runhao Zhang,Jing Huang,Kang Liang,Pu Chen,Peipei Sun,Biao Kong
Physical adsorption is a common method to solve the contamination of methylene blue in dyeing wastewater. As a kind of adsorption material, cellulose aerogels with high porosity and surface areas have great potential application in methylene blue removal. However, the week hydrogen bonding between cellulose nanofibers making the cellulose aerogels with the poor mechanical properties and can be easily destroyed during adsorption. Hence, the preparation of cellulose aerogels with high mechanical strength is still a great challenge. Here, we report a robust super-assembly strategy to fabricate cellulose aerogels by combining cellulose nanofibers with PVA and M-K10. The resulting cellulose aerogels not only has a robust chemically cross-linked network, but also has strong H-bonds, which greatly enhance the mechanical properties. The resulting cellulose aerogels possess a low density of 19.32 mg/cm 3 . Furthermore, the cellulose aerogel shows 93% shape recovery under 60% strain (9.5 kPa under 60% strain) after 100 cycles, showing excellent mechanical property. The adsorption capacity of cellulose aerogel to methylene blue solution of 20 mg/L is 2.28 mg/g and the adsorption kinetics and adsorption isotherms have also been studied. Pseudo-second-order kinetic model and Freundlich isotherm model are more acceptable for indicating the adsorption process of methylene blue on the cellulose aerogel. Thus, this compressible and durable cellulose aerogel is a very prospective material for dyeing wastewater cleanup.
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高影响因子
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