MOLECULES
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2022
·Vol. 27
·期 19
·6507
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IF 4.927
Huwei Xing,Yongsheng Fei,Jingru Cheng,Congcong Wang,Jingjing Zhang,Chenxi Niu,Qian Fu,Jiali Cheng,Lingbin Lu
In this study, a green, highly efficient and low energy consumption preparation method of cellulose nanofiber (CNF) was developed by using agricultural and forestry waste durian rinds as raw materials. The power of ultrasonic treatment was successfully reduced to only 360 W with low molecular weight liquid DMSO. The obtained durian rind-based CNF had a diameter of 8–20 nm and a length of several micrometers. It had good dispersion and stability in water, and could spontaneously cross-link to form hydrogel at room temperature when the concentration was more than 0.5%. The microscopic morphology and compressive properties of CNF aerogels and composite cellulose aerogels prepared from durian rind-based CNF were evaluated. It was found that CNF could effectively prevent the volume shrinkage of aerogel, and the concentration of CNF had a significant effect on the microstructure and mechanical properties of aerogel. The CNF aerogel with 1% CNF exhibited a sheet structure braced by fibers, which had the strongest compression performance. The porosity of CNF aerogels was high to 99%. The compressive strength of the composite cellulose aerogel with durian rind-based CNF was effectively enhanced.Keywords:durian rind;cellulose nanofiber;dimethyl sulfoxide;ultrasonic;aerogel
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高影响因子
CARBOHYDRATE POLYMERS
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2022
·
IF 10.723
Shaohuang Chen,Ning Yue,Mei Cui,Anastasia Penkova,Renliang Huang,Wei Qi,Zhimin He,Rongxin Su
TEMPO-oxidized cellulose nanofibrils (CNFs) possess lots of attractive properties. However, recycling of TEMPO is desirable because of ecological and economic demands. In this study, a novel strategy integrating direct reuse and extraction recovery of TEMPO was developed. 50 % of filtrates after TEMPO oxidation were directly reused and half of the fresh TEMPO was added to maintain a constant dosage, the obtained CNFs within 2 cycles shared similar carboxylate contents, crystallinity , and homogeneous width compared to the original ones. Furthermore, TEMPO in another 50 % of filtrates was extracted by ethyl acetate followed by distillation. The CNFs produced using the extracted TEMPO had almost the same properties compared to those of original ones, suggesting a negligible loss of activity of the recovered catalyst. Compared to the traditional route, the combined strategy exhibited a 31.3 % reduction in production costs, which enables clean and cost-effective production of CNFs and shows a promising industrial feasibility.
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CARBOHYDRATE POLYMERS
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2022
·
IF 10.723
Xiao-kun Ouyang,Lijuan Zhao,Fangyuan Jiang,Junhong Ling,Li-Ye Yang,Nan Wang
Porous microsphere hemostatic materials, which possess rapid hemostatic, antibacterial, and wound healing-promotion properties, have key advantages over hemostatic dressings with a single hemostatic function. Using rod-shaped cellulose nanocrystals as the supporting framework, sodium alginate/cellulose nanocrystal porous microspheres (SA/CNC) were prepared using an inverse emulsion method. After SA/CNC self-assembly with the antibacterial polymer ε-polylysine, the hemostatic porous microspheres (PSLMs) showed high porosity, high liquid absorption capacity, and excellent coagulation properties. The in vitro and in vivo coagulation properties of PSLMs were evaluated and compared with those of the commercially available chitosan hemostatic powder. PSLMs had marked hemostatic effects in the following mouse hemorrhage models: caudal (81.20 s), liver (48.44 s), and femoral artery (71.66 s). After the introduction of ε-polylysine with excellent antibacterial properties to PSLMs, PSLMs effectively inhibited the activities of Escherichia coli , Staphylococcus aureus , and Pseudomonas aeruginosa .
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 25
·12138-12146
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IF 4.682
Liu Yupeng,Jian Junyu,Xie Yitong,Gao Shishuai,Zhang Daihui,Shi Hao,Xu Yuzhi,Lai Chenhuan,Wang Chunpeng,Chu Fuxiang
Magnetic hydrogels have been widely utilized in the fields of biomedical devices, flexible electronics, and soft robotics. Unfortunately, current strategies to synthesize magnetic hydrogels are difficult to achieve high mechanical properties. Herein, we have presented a biomimetic strategy to synthesize a strong, tough and elastic cellulose enhanced magnetic hydrogel (CEMH). The cellulose skeleton containing magnetic nanoparticles was first generated by self-assembly of cellulose chains as the enhancement filler, while elastic polyacrylamide formed by in situ polymerization functioned as the elastic matrix. The mechanical and physicochemical properties of CEMH, as well as the effect of Fe 3 O 4 and acrylamide concentration on the performance, were systematically investigated. The highest tensile strength and toughness of CEMH could reach 1.1 MPa and 2.9 MJ/m 3 , respectively. Furthermore, CEMH showed a high elastic recovery of 94.5% (10th cycle), accompanies by a certain swelling resistance ability. All these advantages were accomplished mainly owing to the synergetic contribution of biomimetic design and enhanced non-covalent interactions.
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高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Qianqian Peng,Yunjie Lu,Zhaohui Li,Jianming Zhang,Lu Zong
High-performance thermally insulating nanocellulose-based aerogels with robust mechanical properties is highly desirable for energy-saving and thermal protection applications. However, the large-scale applications of traditional nanocellulose aerogels are still limited by their brittleness nature and rigorous processes. Herein, an effective biomimetic hybrid strategy for high strength and thermal insulated nanocellulose-based aerogel with hierarchical-ordered microstructure is designed and fabricated. The novel cellulose nanoclaws-based aerogels extracted from corncob are hybridized by nanosized silica aerogel layer in situ and have an intensified H-bonding crosslinked network after ambient-drying and hotpress treatment, endowing excellent mechanical properties (16–58 MPa) as well as scalable potential for structure materials. Benefitting from the synergistic effect of the tailored hierarchical-ordered microstructure, the resulting hybrid aerogels also possess high specific surface area (30–630 m 2 g −1 ), low thermal conductivity (0.021 W m −1 K −1 ), and outstanding flame retardant . This hybrid strategy provides an avenue to produce thermal-insulated and mechanically robust materials.
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Food Packaging and Shelf Life
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2022
·
IF 8.749
Jingkun Zhao,Tao Liu,Kai Xia,Xin Liu,Xiaodong Zhang
In this paper, agar/gelatin (AG/GE) composite film modified by cellulose nanocrystals (CNC), agar/gellan gum (AG/GG) and agar/κ-carrageenan (AG/KC) composite films modified by CNC and calcium chloride were prepared and their properties were investigated. The results showed that the three prepared nanocomposite films exhibited dense and smooth surface structure, and their tensile strength (TS), elongation at break (EB) and light transmittance were larger than 60 MPa, 21 %, 80 % at 660 nm, respectively. Their water swelling rate (SR), water solubility (WS) and water vapor permeability (WVP) were lower than 155 %, 33 % and 6.8 × 10 −11 g m/m 2 Pa s, respectively. These three prepared films not only exhibited better comprehensive properties than those of the existing studies, but also possessed edible, good light transmittance and heat seal performance, especially, possessed better fresh keeping performance than plastic-based food packaging film when they were used to preserve strawberry through packaging or coating methods.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2022
·
IF 6.437
Gang Wu,Haojie Yang,Wenran Gao,Kui Wang,Maxim V. Penzik,Alexander N. Kozlov,Bin Li,Yong Huang,Shu Zhang,Hong Zhang
Acid-catalyzed hydrolysis and metal-catalyzed hydrogenolysis are two important methods for conversion of cellulose into high value-added chemicals, which preferentially use homogeneous acids and precious metals as catalysts, respectively. This paper reports that cobalt disulfide (CoS 2 ) can be competent in both acid hydrolysis and hydrogenolysis reactions as an inexpensive heterogeneous catalyst by controlling its morphology. Two kinds of CoS 2 with imperfect spherical (A-CoS 2 ) and regular octahedral (Syn-CoS 2 ) morphologies were tested in the conversion of 5-hydroxymethylfurfural (HMF) under a hydrogen atmosphere. Interestingly, A-CoS 2 showed high activity in the hydrogenolysis of HMF to 2,5-hexanedione (2,5-HD) with a yield of 81.5 wt%, while Syn-CoS 2 was responsible for the acid hydrolysis of HMF to methyl levulinate (ML) in high yield of 90.8 wt%. Characterization of the two catalysts suggested that Syn-CoS 2 had higher Co 2+ /Co 3+ ratio in comparison to A-CoS 2 , leading to a proportional difference in their acid site numbers. The unique activity of these two catalysts was also reflected in the conversion of cellulose. In particular, Syn-CoS 2 exhibited high selectivity to ML formation from cellulose and good recyclability.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Qinyu Wang,Wei Zuo,Yu Tian,Lingchao Kong,Guiyuan Cai,Haoran Zhang,Lipin Li,Jun Zhang
To achieve efficient removal of copper(II) from heavy metal wastewater, designing an eco-friendly and low-cost adsorbent is highly desirable. Here, a novel air- and underwater shape-memory cellulose aerogel was reported via coupling brushite and polyethyleneimine (PEI)-modified nanofibrillated cellulose (NFC) for selectively adsorbing Cu(II) ions. The adsorption kinetic and isotherm studies were consistent with pseudo-second-order model and Langmuir model, indicating the removal of Cu(II) was a monolayer chemisorption process. Benefiting from the open three-dimensional (3D) framework structure and abundant exposed active sites, such compressible aerogel exhibited excellent adsorption capacity of 332.66 mg/g for Cu(II). In addition, the developed aerogel could be conveniently used as a continuous flow filter for successive purification of industrial wastewater, where the up-to-standard treatment volume was about 5.6 L. The Cu(II)-loaded aerogel could be regenerated after being eluted by 0.1 M EDTA-2Na, and its structure, shapeability and selective adsorption properties were hardly affected even after 8 consecutive cycles. Mechanistic analysis confirmed that the surface complexation, ion exchange and chemical deposition were the main driving forces for the superior adsorption performance. Finally, PNFCA/BRU could inhibit the contamination of crops by heavy metals, which was a great safeguard for wheat growth.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 28
·e52617
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IF 3.057
Yifan Suo,Wei Gao,Zhongwei Chen,Yuan Yu,Tingting Chen,Changxin Li,Qingwu Zhang,Juncheng Jiang
In this work, surface modification of cellulose nanocrystal (CNC) with diphenyl phosphate and Zn(OAc) 2 ·2H 2 O was prepared by a green method to obtain CNC-based flame retardant CNC@DPP@Zn and then added into epoxy resins (EP). The structure, morphology, and thermal stability of CNC@DPP@Zn were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and thermogravimetric analysis (TG). Flame retardancy and combustion behavior of EP/CNC@DPP@Zn composites were characterized by TG, limiting oxygen index (LOI) test, vertical burning (UL-94) test and cone calorimeter tests (CCT). The results of CCT demonstrated that the peak heat release rate (pHRR), total heat release (THR), and total smoke production (TSP) of EP/8CNC@DPP@Zn composites reduced by 38.3%, 15.5%, and 36.0%, respectively, compared with pure EP. The char residues after CCT were characterized by laser Raman spectroscopy (LRS) and scanning electron microscope (SEM). Finally, the flame retardancy mechanism of CNC@DPP@Zn was proposed.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ming-Bang Wu,Shi-Cheng Liu,Jin-Yan Fei,Hao Ye,Lu-Lin Ma
The effective treatment of uranium (U)-containing radioactive wastewater that from the mining process and nuclear leakage accidents is considered as the promise for the sustainable development of nuclear energy. Herein, amidoxime-functionalized microspheres with high grafting densities were prepared by the non-solvent induced phase separation and followed by surface chemical modifications while choosing celluloses as the raw materials in terms of broad resource, good hydrophilicity, and antimicrobial property. The excellent hydrophilicity of cellulose could reduce the rates of phase separation, leading to porous surface structures and spongy internal structures. In addition, the following swelling treatments would further modulate for higher pore sizes and porosities which could not only create more reaction sites during the modification but also promote the mass transfer as well as increase contact areas and retention times during the adsorption process. The obtained microspheres could selectively decontaminate more than 390 mg/g of uranium due to their abundant adsorption sites. In addition, their outstanding hydrophilicity endows them with good reusability and anti-fouling properties. The microspheres could also be put into filtration columns for long-term and dynamic adsorption which could be regarded as a decided advantage compared with common fiber-based adsorbents. The filtration columns could capture more than 17 mg/g after 20 days of uranium even with ultralow initial uranium concentrations and ultrahigh concentrations of other coexisting ions, demonstrating their desirable potentials in remediating radioactive wastewater.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Xiaojun Wang,Jinsong Zeng,J.Y. Zhu
Post-fibrillation endoglucanase treatment was employed to reduce the entanglement of cellulose nanofibrils (CNFs) produced with low extent of mechanical milling. The results showed that post-fibrillation endoglucanase treatment can effectively reduce the fibril degree of polymerization (DP) values and therefore entanglement. Cellulose DP was reduced from 520 for CNFs prepared by milling using a SuperMassColloider with 1 pass to 225 after endoglucanase treatment at a low dosage of 1 mg protein/g fibril for 24 h. Endoglucanase treatment can also effectively reduce the fibril mean diameter from 66 nm to 25 nm. Applying post-fibrillation endoglucanase treatment produced more uniform CNFs than the feed CNFs from pure mechanical treatment. All CNFs suspensions prepared by post-fibrillation endoglucanase treatment were non-Newtonian (except at very low concentrations below 0.5 wt%) with shear thinning behavior. Post-fibrillation endoglucanase treatment reduced the viscosity of CNF suspensions due to decreasing fibril DP values and the extent of entanglement.
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高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Yan Sun,Yuan Yang,Lingling Fan,Wenfeng Zheng,Dezhan Ye,Jie Xu
Polypyrrole (PPy)/bacterial cellulose (BC) composite membranes are a promising kind of lightweight and flexible electrodes for supercapacitors . Herein, we explored a facile and efficient electrostatic self-assembly approach to uniformly depositing anion-doped PPy onto positively charged SnCl 2 -modifed BC (SBC). The obtained PPy@SBC electrode exhibited a high areal capacitance of 5718 mF cm −2 at a current density of 0.5 mA cm −2 , a desirable capacitance retention of 83.1% at 5.0 mA cm −2 and excellent cycling stability (a capacitance retention of 86.8% after 10,000 cycles at 10 mA cm −2 ). A symmetric flexible supercapacitor was further assembled with the PPy@SBC electrodes, which delivered outstanding mechanical flexibility with negligible capacitance decay under different bent states. This study shows impressive potential in fabricating high-performance electrodes for flexible supercapacitors.
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