SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Dandan Hao,Bo Fu,Jiancheng Zhou,Jingyin Liu
Particulate matter (PM) is one of the major air pollutants that is harmful to both environment and human health. Herein, Ti-based metal-organic frameworks (MOFs) of MIL-125 and MIL-125-NH 2 were integrated into bacteria cellulose/chitosan foam (BCH) and used as air filters. A directional freeze-drying approach was used to construct foam matrix, in which the meso-/macropores of polymer skeleton contribute to the required accessibility toward MOFs and minimize gas diffusion barriers. Benefiting from the hierarchically porous structure, the composites foam presented superior filtration properties with high removal efficiencies and low pressure drops. The filtration efficiency of MIL-125-NH 2 @BCH filter for PM 2.5 could exceed 99.5% with a good long-time (30 days) stability. The pressure drop is determined to be 39.4 Pa. The filtration mechanisms are attributed to the electrostatic interaction between MOFs and PM particles, the presence of amine groups, as well as the inhibition effect of fibrous polymer network. This work will shed light on the development of MOF-polysaccharide composites for air purification applications.
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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
Na Li,Gaowei Kang,Hao Liu,Weiwang Qiu,Qian Wang,Liu Liu,Xueli Wang,Jianyong Yu,Faxue Li,Dequn Wu
Flame retardant and antibacterial investigation of cellulose has attracted more and more attention. In order to improve the modification efficiency, inspired by multiple hydrogen bonding in spider silk, flame retardant and antibacterial dual function modified cellulose was achieved by multi structure hydrogen bonding in this research. A novel nano SiO 2 based Schiff base flame retardant (SiAPH) and dodecyl quaternary ammonium salt (HDAC) were synthesized. Tannin (TA) was introduced as medium to provide synergistic flame retardant and antibacterial with SiAPH and HDAC. The flame retardancy assessment demonstrated that the limiting oxygen index (LOI) of modified cotton fabrics increased from 18% to 26.1%, and the peak of heat release rate (pHRR) decreased by 41.0%, UL-94 vertical combustion proved the modified cotton fabrics had capability of self-extinguishing. The antibacterial of modified fabrics were confirmed against Staphylococcus aureus and Escherichia coli, and the inhibition rate reached to 99.1%. In addition, it worth noting that the biocompatibility and antibacterial activity of modified fabrics were evaluated via MTS assay and establishment of animal wound model. Low toxicity of the fabrics was verified by the L929 fibroblast cells. The anti-infection experiment model showed that the modified fabrics had a positive effect on prevention of infection, and the wound healing rate reached to 86.8% after 14 days’ treatment. The flame retardancy, antibacterial and biocompatibility of the functional cotton fabrics indicated that they were ideal candidate for applications of vehicle interior, soft decoration in public and medical scene.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Aihua Qiao,Renliang Huang,Anastasia Penkova,Wei Qi,Zhimin He,Rongxin Su
Nanocellulose-based aerogels have gradually attracted attention in the field of oil/water separation owing to their light weight, excellent absorption properties, and environmental-friendliness. Herein, we report a facile and easily scalable method for fabricating superhydrophobic, elastic and anisotropic cellulose nanofiber (CNF) aerogels. Directional freeze-drying, soaking in polydimethylsiloxane (PDMS) solution and heat treatment were applied to obtain anisotropic and aligned CNF-PDMS aerogel sheets and blocks with superhydrophobicity and high elasticity. The CNF-PDMS aerogel sheets could realize continuous oil/water separation by filtration with a flux up to 2800 L·m −2 ·h −1 and a separation efficiency of 99.9%. The CNF-PDMS aerogel blocks could separate the oil/water mixture by the absorption–extrusion, and could also be applied in real-time continuous oil/water separation by vacuum suction with a flux as high as 145 L·h −1 ·g −1 and a separation efficiency of 99.9%. Overall, our anisotropic CNF-PDMS aerogels are the promising materials for low-cost rapid oil/water separation in multiple separation pathways.
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高影响因子
FOOD HYDROCOLLOIDS
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2022
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IF 11.504
Chan Lei,Yunxiao Xie,Yilan Wu,Yan Li,Bin Li,Ying Pei,Shilin Liu
The stabilization of food-grade water in water (W/W) emulsions, as a potential candidate for encapsulating water-soluble functional components, remain a significant challenge in food science research. The main purpose of the work was to find a suitable particle for the preparation of the novel W/W emulsion. This system was composed of two immiscible water-soluble biopolymers (dextran and maltodextrin), and stabilized by using bacterial cellulose (BC) nanofibrils. The BC-stabilized W/W emulsions were successfully fabricated with the 20 wt% dextran (DEX) and the 10 wt% maltodextrin (MAL). There was no significant change in the droplet size of the emulsion with increasing BC surface charge from 0.41 mmol/g to 1.41 mmol/g dry cellulose. Meanwhile, the apparent viscosity, storage modulus ( G′ ) and loss modulus ( G″ ) of the emulsions were decreased with increasing BC surface charge. The stabilization mechanism of the W/W emulsion was due to the formation of viscoelastic network structure by BC nanofibrils. When the BC content increased from 0.04 wt% to 0.16 wt%, the emulsion droplet size was decreased from 3.78 ± 0.79 μm to 2.01 ± 0.40 μm. Furthermore, the obtained W/W emulsion did not demulsify within 7 d, it had better stability than that of the reported W/W emulsion. Moreover, the BC-stabilized emulsion was insensitive to the change of ionic strength concentration (0–200 mM) and pH (3–11). In brief, it was the first report to use BC nanofibrils to stabilize the W/W emulsion, which enriched the type of W/W emulsion.
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 7
·4243-4254
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IF 6.123
Lin Ling,Wang Chunxia,Mao Haiyan,Wu Huanling,Li Ziyin
Research on multi-functional fabrics is an inevitable trend in the future development of textile field. Nevertheless, the key to the development of multifunctional fabric is how to solve the problem of contradictory function combination and how to achieve the multifunctions. In this work, a novel multifunctional fabric based on cellulose/silica microcapsules was developed by using a facile and economical method. Owing to the loaded essence and hydrophobic coupling reagent and UV absorber modified silica of microcapsules, the coated fabric not only exhibited the slow-release property of fragrance, but also had the excellent superhydrophobicity and ultraviolet (UV) protection. Furthermore, this multifunctional fabric also displayed the durable superhydrophobicity and UV protection even after chemically or mechanically damaged. The development of multifunctional fabrics largely depends on the development of textile functional finishing agent and finishing technology. Therefore, it is very important to develop new functional microcapsules or finishing agent. Graphical abstract
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高影响因子
APPLIED SURFACE SCIENCE
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2022
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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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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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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2022
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IF 6.449
Hao Sun,Tong Ji,Zechun Ren,Hongjie Bi,Min Xu,Zhenhua Huang,Liping Cai
Sustainable structure materials with excellent strength and toughness have received extensive attentions. However, the great challenge of incorporating high content cellulose into polymeric matrix still remain. In this study, sustainable structural material with an ultrahigh cellulose content of 96.1 wt percent was achieved for the first time through a nacre-inspired mesoscale assembly strategy. Densified TEMPO-oxidized wood (TW) was used as building blocks to prepare TEMPO-oxidated wood reinforced polymer (TWRP) by coating with epoxy resin and cross-laminating. The resulting TWRP with biomimetic “brick-and-mortar” structure exhibited excellent strength of 137 MPa and high toughness of 1.79 MJ m −3 compared with 7.29 MPa and 0.04 MJ m −3 for natural wood, respectively. Meanwhile, the TWRP possessed a low anisotropic factor of 1.07. Moreover, TWRP demonstrated low environmental impact, low cost, low energy consumption, and easy to be expanded from the lab-scale research to the large-scale application, potentially being a low-cost, high-performance, sustainable structural material.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 11
·6474-6486
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IF 4.682
Ma Xi,Wang Chengyang,Guo Hanxiang,Wang Zhaofeng,Sun Nan,Huo Pengfei,Gu Jiyou,Liu Yang
Cellulose acetate (CA) is widely used in the preparation of ultrafiltration membranes due to its many excellent characteristics, especially chemical activity and biodegradability. To improve the inherent hydrophobic and antifouling properties of CA membrane, in this work, CA was successfully modified with dopamine (CA-2,3-DA) through selective oxidation and Schiff base reactions, which was confirmed by FTIR and 1 H NMR measurements. Then, CA-2,3-DA membrane with high water permeability and excellent antifouling property was prepared by the phase inversion method. Compared with the original CA membrane, the CA-2,3-DA membrane maintained a higher rejection ratio for BSA (92.5%) with a greatly increased pure water flux (167.3 L m −2 h −1 ), which could overcome the trade-off between permeability and selectivity of the traditional CA membrane to a certain extent. According to static protein adsorption and three-cycle dynamic ultrafiltration experiments, the CA-2,3-DA membrane showed good antifouling performance and superior long-term performance stability, as supported by the experimental results, including flux recovery ratio, flux decline ratio, and filtration resistance. It is expected that this approach can greatly expand the high-value utilization of modified natural organic polysaccharides in separation engineering.
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 3
·1473-1485
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IF 6.123
Xia Yuanyuan,Li Xinping,Yuan Yue,Zhuang Jingshun,Wang Wenliang
The preparation of cellulose beads has attracted much attention in the application of advanced green materials. Herein, the uniform and controllable cellulose beads were prepared by first dissolving the pulp into N-methylmorpholine N-oxide (NMMO), and then regenerated in various coagulation baths (water, alcohol, acid, NMMO, etc.). Results showed that the crystalline structure of regenerated cellulose changed from cellulose I to cellulose II. Besides, the cellulose beads regenerated in Methanol (MT-cellulose bead) had the highest porosity (90.51%) and crystallinity (62.59%). Laser confocal microscopy was employed to reveal the coagulation mechanism of cellulose beads, and the solidification process was carried out from the inside to the outside. This is a green and facile method for preparing cellulose beads with different structures and properties that can be widely used in absorbent materials, energy storage materials, and protein chromatography. Graphical abstract
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Jia Li,Defeng Wu
Using polysaccharide nanocrystals such as chitin nanocrystals (ChNCs) or cellulose nanocrystals (CNCs) as fillers of biodegradable aliphatic polyesters is an attractive approach of fabricating completely biodegradable nanocomposites. Most aliphatic polyesters are semi-crystalline and hence to reveal the effect of nanocrystals on their crystallization behaviors is key to regulate final properties of the nanocomposites. In this work, poly(ε-caprolactone) (PCL) nanocomposites filled with ChNCs and CNCs were prepared as templates for the study. It is intriguing that these two nanocrystals play completely different roles towards crystallization of PCL. CNCs are nucleating agent, promoting nucleation of PCL and accelerating subsequent crystal growth; while ChNCs are anti-nucleation agent, retarding nucleation of PCL and depressing whole process of PCL crystallization. This difference arises from different particle-polymer affinities in the nanocomposites, which is confirmed by the thermodynamic and rheological tests. This work provides valuable information around tuning the thermal properties of polysaccharide nanocrystals filled polymeric nanocomposites.
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高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Feiyang Li,Yaqiong Zhang,Xiaomin Tang,Peize Song,Lijing Su,Junfeng Fan
This study aimed to improve the emulsifying properties of microcrystalline cellulose by carboxylating (CC) and bridging to hydrophobic oat globule peptides (HP) via Ca 2+ (CC-Ca-HP). FTIR and XRD spectra analysis proved the successful attachment of HP to CC through a salt bridge. The Ca 2+ -bridging significantly changed the particle characteristics of CC-Ca-HP, including particle size, ζ-potential, and wettability. The Ca 2+ -bridged composite CC-Ca-HP demonstrated remarkable emulsifying stability compared with the nonbridged blend (CC–HP). Further analysis of the steady flow characteristics and dynamic viscoelastic properties revealed a network structure formed in the CC-Ca-HP emulsion. Moreover, the CC-Ca-HP emulsion showed a marked release of free fatty acids, increased bioaccessibility of zeaxanthin in the simulated gastrointestinal digestion, and less oil oxidation under the accelerated oxidation condition, indicating that the stable structure of CC-Ca-HP imparted by Ca 2+ -bridging prevented the aggregation of oil droplets as collision occurred under the harsh gastric conditions.
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高影响因子
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