Journal of Advanced Research
·
2021
·
IF 10.479
Chao Deng,Farzad Seidi,Qiang Yong,Xiangyu Jin,Chengcheng Li,Ling Zheng,Zhenghong Yuan,Huining Xiao
Introduction Face masks are regarded as effective Personal Protective Equipment (PPE) during the COVID-19 pandemic. However, the dominant polypropylene (PP)-based masks are devoid of antiviral/antibacterial activities and create enormous environmental burdens after disposal. Objectives Here we report a facile and potentially scalable method to fabricate biodegradable, breathable, and biocidal cellulose nonwovens (BCNWs) to address both environmental and hygienic problems of commercially available face masks. Methods TEMPO-oxidized cellulose nonwovens are rendered antiviral/antibacterial via covalent bonding with disinfecting polyhexamethylene guanidine or neomycin sulfate through carbodiimide coupling chemistry. Results The obtained results showed that the BCNWs have virucidal rate of >99.14%, bactericidal efficiency of >99.51%, no leaching-out effect, and excellent air permeability of >1111.5 mm s −1 . More importantly, the as-prepared BCNWs can inactivate SARS-CoV-2 instantly. Conclusions This strategy provides a new platform for the green fabrication of multifunctional cellulose nonwovens as scalable bio-protective layers with superior performance for various PPE in fighting COVID-19 or future pandemics. Additionally, replacing the non-biodegradable non-antimicrobial PP-based masks with the cellulose-based masks can reduce the plastic wastes and lower the greenhouse gas production from the incineration of disposed masks.
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Yang Liu,Haitao Huang,Pengfei Huo,Jiyou Gu
This study focused on the preparation of a new kind of membrane material, zwitterionic cellulose acetate (ZCA), via a three-step procedure consist of oxidization, Schiff base and quaternary amination reaction, and the fabrication of antifouling ZCA ultrafiltration membrane by the non-solvent-induced phase separation method (NIPS). The morphologies, surface chemical structures and compositions of the obtained CA and ZCA membranes were thoroughly characterized by field emission scanning electron microscopy (FE-SEM) with energy dispersive X-ray (EDX) spectroscopy, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), respectively. Meanwhile, the thermal stability, porosity and average pore size of two investigated membranes were also studied. As a result, the ZCA membrane displayed significantly improved hydrophilicity and water permeability compared with those of the reference CA membrane, despite a slight decrease in the protein rejection ratio. According to the cycle ultrafiltration performance of bovine serum albumin (BSA) solution and protein adsorption experiment, ZCA membrane exhibited better flux recovery property and fouling resistant ability, especially irreversible fouling resistant ability, suggesting superior antifouling performance. This new approach gives polymer-based membrane a long time life and excellent ultrafiltration performance, and seems promising for potential applications in the protein separation.
✓ 已验证
DOI
高影响因子
Gels
·
2021
·Vol. 8
·期 1
·17
·
IF 4.702
Qiqi Song,Changqing Miao,Huazheng Sai,Jie Gu,Meijuan Wang,Pengjie Jiang,Yutong Wang,Rui Fu,Yaxiong Wang
Forming fibers for fabric insulation is difficult using aerogels, which have excellent thermal insulation performance but poor mechanical properties. A previous study proposed a novel method that could effectively improve the mechanical properties of aerogels and make them into fibers for use in fabric insulation. In this study, composite aerogel fibers (CAFs) with excellent mechanical properties and thermal insulation performance were prepared using a streamlined method. The wet bacterial cellulose (BC) matrix without freeze-drying directly was immersed in an inorganic precursor (silicate) solution, followed by initiating in situ sol-gel reaction under the action of acidic catalyst after secondary shaping. Finally, after surface modification and ambient drying of the wet composite gel, CAFs were obtained. The CAFs prepared by the simplified method still had favorable mechanical properties (tensile strength of 4.5 MPa) and excellent thermal insulation properties under extreme conditions (220 °C and −60 °C). In particular, compared with previous work, the presented CAFs preparation process is simpler and more environmentally friendly. In addition, the experimental costs were reduced. Furthermore, the obtained CAFs had high specific surface area (671.3 m²/g), excellent hydrophobicity, and low density (≤0.154 g/cm3). This streamlined method was proposed to prepare aerogel fibers with excellent performance to meet the requirements of wearable applications.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Xing Li,Yinghui Ma,Dacheng Li,Shaorong Lu,Yuqi Li,Ziwei Li
Self-healing biomass-based conductive hydrogels are applied as flexible strain sensors for wearable devices and human movement monitoring. Cellulose is the most abundant biomass-based materials and exhibits excellent toughness, dispersion and degradability. In this paper, nanocellulose crystals (NCCs) prepared from sisal, used as reinforcing fillers were coated with tannic acid (TA) to prepare inexpensive bio-nanocomposite hydrogels that also included polyvinyl alcohol , okra polysaccharide (OP), and borax . These hydrogels exhibit excellent self-healing and mechanical properties with the maximum elongation, toughness, and self-healing efficiency (9 min) of 1426.2 %, 264.4 kJ/m 3 , and 62.1 %, respectively. A fabricated hydrogel strain sensor was successfully used to detect and monitor various human movements such as wrist bending, elbow bending, and slight changes in facial expression. In addition, this sensor possessed excellent durability and good working stability after repeated circulation. The nanocomposite hydrogel synthesized in this work utilized natural polysaccharide to manufacture flexible functional materials with good application prospects in the field of flexible sensors.
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2022
·
IF 7.188
Yijie Bai,Weiqi Chen,Tianqi Tang,Yurong He
The ability of hydroxypropyl cellulose (HPC)-based smart windows to dynamically regulate incident light and reduce energy consumption is of great interest. Although HPC is environmentally friendly due to its nontoxicity and biodegradability, commercial applications are limited due to its relatively high lower critical solution temperature (LCST). In this paper, reduced graphene oxide (rGO) was added to HPC solutions to enhance photothermal performance and access higher solution temperatures under sunlight illumination. For a 5-mL volume of HPC solution (0.5 wt%), each milliliter of rGO solution (0.1 mg/mL) increased the solution temperature by 3.13 °C. The tadpole-shaped fibers were hydrophilic below the LCST but became hydrophobic and tended to form net structures above the phase-change temperature. Water molecules were expelled from the web structure at the same time. Our work broadens the applications of HPC in smart windows.
✓ 已验证
DOI
高影响因子
Bioresource Technology Reports
·
2018
·
IF 0
Ning Shi,Qiying Liu,Xiong He,Hu Cen,Rongmei Ju,Yulan Zhang,Longlong Ma
Solid Al 2 (WO 4 ) 3 was prepared by coprecipitation and employed to catalyze the conversion of cellulose into lactic acid. Under optimum condition of 220 °C and 3 h, 46% of lactic acid could be produced from cellulose with the aid of Al 2 (WO 4 ) 3 . The catalytic activity of the catalyst is ascribed to the synergistic effect of the W O species and the adjacent Al OH species in Al 2 (WO 4 ) 3 . The formation of hydrogen bond and coordination bond between the W O species and the hydroxyl group in the carbohydrates plays critical role in the catalytic conversion of cellulose into lactic acid. The catalyst has good hydrothermal stability and can be easily to be recycled.
✓ 已验证
DOI
POLYMER
·
2022
·
IF 4.432
Yachen Wang,Mingxing Gao,Sai Li,Jun Liu,Anchao Feng,Liqun Zhang
Traditional thermoset polymeric materials pose an enormous burden on the environment due to permanent covalent cross-links that make them difficult to reprocess or recycle. Herein, we describe the facile synthesis of recyclable, healable and reprocessable poly-dimethylsiloxane (PDMS)/cellulose nanocrystals (CNC) composites via engineering dynamic covalent bond (DCB) vinylogous urethane between the polymer-polymer and polymer-CNC. We successfully prepared the amine-modified CNC, evidenced by the analysis of FTIR, XPS and Element analysis , and its surface morphology as well as its size compared to the pristine one is not altered via XRD and TEM analysis . The DCBs are constructed not only between polymer chains, but also on the interface between polymer and CNC. Interestingly, the macromolecular cross-linker synthesized by RAFT polymerization significantly improves the mechanical properties of PDMS-based CNC vitrimer, without affecting its recycling and reprocessing properties. Remarkably, DCB vinylogous urethane endows this vitrimer good self-healing, reprocessing and recycling and this DCB can be effectively reshaped by the catalyst-free transamination of the vinylogous urethane through hot pressing or welding. It is emphasized that this macromolecular cross-linker containing β -keto acids obtained by RAFT polymerization can significantly broaden the application range for DCB vinylogous urethane. In general, this work could provide a facile approach to design and fabricate high performance renewable CNC based composites with excellent self-healing, reprocessing and recycling capabilities.
✓ 已验证
DOI
高影响因子
Water Supply
·
2021
·Vol. 21
·期 8
·4355-4368
·
IF 1.033
Weng Rengui,Tian Feng,Huang Xin,Ni Liufang,Xi Beidou
Cellulose membranes have the advantages of good hydrophilicity, excellent mechanical properties, and biodegradability. Therefore, they are the first choice to replace petroleum polymer membranes. In this study, cellulose (BC) and chitosan (CS) were used as raw materials, and N-methylmorpholine-N-oxide (NMMO) was used as solvent. A new kind of cellulose nanofiltration membrane (BC-NFM), cellulose/chitosan nanofiltration membrane (BC/CS-NFM), and interfacial polymerized cellulose/chitosan composite nanofiltration membrane (IP-BC/CS-NFM) were successfully prepared by NaOH hydrolysis and chloroacetic acid carboxymethylation modification, piperazine (PIP), and 1,3,5-trimellitic chloride (TMC) interfacial polymerization, respectively. These two methods were used for the preparation of cellulose nanofiltration membranes for the first time.We also studied their structure, separation performance and their capacity to remove typical pollutants. The results showed that obvious holes appeared on the surface of the nanofiltration membrane obtained by alkali hydrolysis and chloroacetic acid carboxymethylation modification, and the cross-section showed a spongelike structure. The surface of the nanofiltration membrane obtained by interfacial polymerization formed a rough and dense separation layer. The rejection rates of the three kinds of nanofiltration membranes were all over 30% for monovalent salt ions, over 60% for divalent salt ions, over 92% for methyl orange, and over 98% for methyl blue. They had good removal effects for typical pollutants in drinking water. Three kinds of cellulose nanofiltration membranes have been prepared. The removal ability of three kinds of cellulose nanofiltration membranes was investigated for typical pollutants in drinking water under different conditions. The nanofiltration membranes operated stably and effluent indices met the requirements of Drinking Water GB5749-2006.
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yue Yang,Xingan Wu,Xueru Sheng,Jian Zhang,Peng Lu,Na Li,Qingwei Ping
Novel modified cellulose/biochar beads (MCBBs) were prepared and utilized as support to immobilize laccase to remove phenol from an aqueous system. Nano CaCO 3 was introduced in CBBs prepared stage to produce proper pore structure by reacting with HCl solution. CBBs were then modified with maleic anhydride to introduce carboxyl groups. By adsorption and covalent bonding, the laccase was immobilized on the MCBBs. The pH, laccase concentration, and contact time were chosen as the main parameters in the laccase immobilizing experiment and the effects of these parameters on immobilization rates and recovered activity were studied. The results demonstrated that the best conditions are: pH 4.0, concentration 8 g L –1 , and contact time 6 h. The thermal and operational stability of the immobilized laccase has attended a good performance under these conditions. The immobilized laccase was used to degrade phenol in an aqueous system and 40.97% removal was achieved after 72 h. The results suggest that as a new green material, MCBBs can be good support for immobilizing laccase. This technique has potential advantages in removing phenol from wastewater.
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 8
·5001-5017
·
IF 5.7
Guo Yan,Wang Yue,Jia Fangting,Li Sihang,Li Sheng,Sarp Sarper,Youravong Wirote,Li Zhenyu
Developing a sustainable separation membrane is imperative due to the growing environmental pollution caused by petrochemical-based polymers. Cellulose-based materials, including bacterial cellulose (BC), have exhibited potential as separation materials. Here, a novel BC membrane (BCM) is in-situ fabricated via microbial fermentation and physical post-treatment. Owing to the randomly assembled BC nanofibers and abundant hydroxyls on their surface, the obtained BCMs possess three-dimensional network structure with strong hydrophilicity. The BCMs properties can be manipulated by adjusting fermentation and drying conditions, satisfying different purposes for practical use. Extending fermentation time from 3 to 10 days, bacteria secret more BC nanofibers and form a denser membrane structure. Freeze-dried BCMs have the most porous structure and exhibit the highest flux (up to 52 L m −2 h −1 ) and molecular weight cut-off (up to 1000 KDa) under 2 bar. Press-dried BCMs obtain the highest tensile strength (up to 241.16 MPa) and BSA retention (up to 94.44%). Heat-dried BCMs show good prospects in the pressure-driven membrane process considering flux and retention and demonstrate favorable stability and flux recovery ratios (85.51%~96.43%). Modification of BCMs by carboxymethyl cellulose further promotes membrane hydrophilicity but causes denser structures than original BCMs. The present study proposes a sustainable cellulose membrane manufacturing strategy and demonstrates BCMs can be favorable alternatives to petrochemical-based membranes.
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2023
·Vol. 31
·期 2
·1115-1137
·
IF 5.7
Nie Yuan,Yan Ruyu,Li Mei,Li Shouhai,Lin Mingtao,Yao Na,Deng Tianxiang,Feng Xiao,Yang Xiaohua,Ding Haiyang,Xu Lina
To improve the flexibility, functionality and recyclability of ethyl cellulose (EC)-based film materials, firstly methyl-nadic-anhydride-modified ethyl cellulose (NEC) was synthesized from EC, and then epoxy castor oil (ECO) was prepared from vegetable oils. Next, a series of NEC/ECO supramolecular composite films were prepared via supramolecular recombination and epoxy ring-opening esterification. Then the molecular structure, shape memory, reprocessing, mechanical, thermal properties and other properties were analyzed in detail. The target products NEC and ECO showing excellent compatibility were successfully prepared, and relatively a few microholes existed on the fracture surface of NEC/ECO composite films. The addition of ECO significantly improved the flexibility of the composite films. The supramolecular composite films displayed relatively excellent thermal stability, and initial thermal decomposition temperature all above 300 ℃. Dynamic mechanical thermal analysis showed that the supramolecular structure of the composite systems was completely reconstructed and no obvious glass transition was observed. Under the action of transesterification catalyst, the reversible ester bonds and hydrogen bonds in the composite system endowed the material with superior shape memory property and excellent recyclability. This research can provide experimental basis and theoretical support for the development and application of functional cellulose-based materials.
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 12
·7065-7078
·
IF 3.809
Liu Xiuyu,Jiang Yan,Qin Chengrong,Yang Shuang,Song Xueping,Wang Shuangfei,Li Kecheng
Abstract Bagasse fibers are smaller and have more hemicellulose than softwood fibers, which is expected to require less mechanical energy in cellulose nanofiber production as small size and hemicellulose benefit the disintegration of fibrils during a mechanical process. Both bagasse fibers and softwood fibers were used in this investigation for producing nanofibers with enzyme pretreatment followed by mechanical grinding. Results showed that nanofibers from bagasse had more uniform diameters about 9 nm, and the films made from them were more transparent. Grinding energy consumption of bagasse fibers was significantly lower than softwood, by 7.31%, and enzyme pretreatment further improved the energy efficiency, by 59.71%, and the yield of nanofibers, by 30.57%. The mechanical strength and thermal stability of nanofiber films from bagasse fibers were similar with that from softwood fibers. The results support the idea that bagasse, a waste or byproduct from sugar industry can be a promising alternative for nanofiber production.
Graphical abstract
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）