CARBOHYDRATE POLYMERS
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2017
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IF 4.811
Miaomiao Han,Xiaosa Jin,Han Yang,Xiao Liu,Yadong Liu,Shengxiang Ji
Traditional cellulose-based chiral stationary phases (CSPs) are prepared by physically coating cellulose derivatives onto substrates and only compatible with a very limited range of solvents as the mobile phase. Therefore, chemical immobilization of cellulose derivatives onto silica gel has been efficiently applied to improve the solvent compatibility of cellulose-based CSPs. Here we developed a novel approach to homogeneously modifying cellulose tris(3,5-dimethylphenylcarbamate) (CDMPC). A series of carboxylic acid functionalized CDMPCs (CC-Xs) with controlled amounts and randomly distributed carboxylic acid groups was synthesized. CC-Xs were effectively immobilized onto amine-modified silica gel to afford immobilized CSPs. Compared to coated-type CSPs, immobilized CSPs significantly improved the solvent compatibility while maintaining similar chiral recognition abilities, but the introduction of excessive functional groups led to a deteriorated performance for columns. Moreover, a commercial drug, atenolol, was also sufficiently separated on the immobilized CSPs.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Chao Liu,Ru-Na Jin,Xiao-kun Ouyang,Yang-Guang Wang
In this study, a composite adsorbent (CCN-PEI) composed of carboxylated cellulose nanocrystals (CCN) and polyethyleneimine (PEI) was prepared through an amidation reaction between the carboxyl groups of the CCN and the amine groups of the PEI. The adsorption performance of the CCN-PEI was tested by removing Cr(VI) ions from aqueous solutions. The physicochemical properties of the CCN and the Cr(VI) ion-loaded CCN-PEI were studied using scanning electron microscopy (SEM), transmission electron microscopy, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. To investigate the adsorption kinetics of Cr(VI) ions onto this newly developed CCN-PEI, we performed experiments under different adsorption conditions, by varying the contact time, solution pH, initial Cr(VI) ion concentration, and adsorption temperature. The prepared CCN-PEI exhibited an encouraging uptake capacity of 358.42 mg × g −1 . The adsorption process was fast: within the first 100 min, Cr(VI) ion adsorption onto the CCN-PEI was about 65%, and the adsorption equilibrium was reached within 250 min. Kinetics experiments indicated that the adsorption process could be described by a pseudo-second-order kinetic model. Furthermore, our adsorption equilibrium data fit the Langmuir isotherms well. The calculated thermodynamic parameters, such as the free energy change ( ΔG = −2.93 kJ × mol −1 ), enthalpy change ( ΔH = −5.69 kJ × mol −1 ), and entropy change ( ΔS = −9.14 kJ × mol −1 ), indicate that the adsorption of Cr(VI) ions onto CCN-PEI was a spontaneous exothermic process. Regeneration tests indicated that CCN-PEI showed good durability and good efficiency for repeated Cr(VI) adsorptions. Based on the results obtained in this work, it can be concluded that CCN-PEI is a potentially effective adsorbent for removing Cr(VI) ions from aqueous solutions.
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ACS Sustainable Chemistry & Engineering
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2017
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IF 5.951
Mei Xiang,Jingna Liu,Wenqian Fu,Tiandi Tang,Dongfang Wu
A hierarchically porous ETS-10-supported highly dispersed Ni catalyst was designed to selectively catalyze the conversion of cellulose to levulinic acid under mild reaction conditions. Full conversion of cellulose and remarkably high yield (91.0%) of levulinic acid are achieved due to the synergistic effect of the unique porous structures and Lewis acid sites in the presence of a hydrogen atmosphere. Moderate Lewis acidic centers of the heterogeneous catalyst are revealed to play a positive role in activating the reaction substrates and intermediates, resulting in prominently catalytic activity. Meanwhile, hierarchical pores centered at 16 nm in ETS-10 benefit the mass transfer and therefore further enhance its catalytic performance. Also, during the process of levulinic acid formation, introduction of hydrogen is responsible for converting cellulose thoroughly and keeping the metal Ni from oxidization by the oxy-compounds, which is distinctive from the widely reported pathway dominated only by cellulose hydrolysis.
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ELECTROCHIMICA ACTA
·
2015
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IF 4.504
Chuang Yang,Chuchu Chen,Yuanyuan Pan,Suiyi Li,Fei Wang,Jianyu Li,Nana Li,Xiaoyan Li,Yayun Zhang,Dagang Li
Here we reported flexible aerogel electrodes for supercapacitors fabricated by freeze-drying combining a cold-press process cellulose nanofibers (CNFs), multi-walled carbon nanotubes (MWCNTs) and polyaniline (PANI) composite system after polymerized polyaniline onto the surface of the cellulose nanofibers and carbon nanotubes by in situ polymerization method. Scanning electron microscope images showed that PANI well coated on the surface of the CNFs and MWCNTs forming a three dimensional conductive network structure. PANI as binder firmly combining each other together and cross-sectional loose structure lead to a small charge transfer resistance (1.24 Ω). Due to the 3D porous structure of the aerogel electrodes, a high specific capacitance of 791.13 F/g was obtained at 0.2 A/g. Furthermore, the aerogel electrodes also showed excellent redox reversibility and cycling stability. The low cost, super light-weight, high-performance, and environmental friendliness aerogel electrodes may have a promising application for the flexible supercapacitors.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Xiangyu Wang,Pei Wang,Jun Ma,Huiling Liu,Ping Ning
Nano zero-valent iron (NZVI) was innovatively and successfully modified by using hydroxyethyl cellulose (HEC) and hydroxypropylmethyl cellulose (HPMC) as dispersants. The systematic characterization observations (including XRD, SEM and TEM) illustrate that, compared with bare nano zero-valent iron particles (BNZVI), the particle sizes of hydroxyethyl cellulose modified (ENZVI) and hydroxypropylmethyl cellulose modified (PNZVI) were decreased, while the dispersity and antioxidizability of ENZVI and PNZVI particles were increased. The discoloration efficiencies of ENZVI, PNZVI, and BNZVI were compared by using dyes (including orange II, methyl orange, methyl blue, and methylene blue) as target pollutant. The results show that both the discoloration efficiency and reaction rate of ENZVI and PNZVI are higher than that of BNZVI. In addition, effects of dispersant content, dye type, pH value, initial dye concentration, iron dosage, and reaction temperature on discoloration efficiencies were studied. The results show that discoloration efficiency was decreased by increasing initial pH value and dye concentration, and it was increased with the increase the iron dosage and reaction temperature. Under optimized NZVI addition of 0.7 g L −1 , the discoloration efficiencies of ENZVI and PNZVI were increased to 96.33% and 98.62%, respectively. And the possible discoloration pathway and dispersant modification mechanism of NZVI were discussed. This study suggests hydroxyethyl cellulose and hydroxypropylmethyl cellulose dispersed NZVI can be utilized as a promising modified nano-material for degradation of dye wastewater.
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CARBOHYDRATE POLYMERS
·
2017
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IF 4.811
Shidong Dai,Nana Prempeh,Dagang Liu,Yimin Fan,Mingyue Gu,Yu Chang
With the increasing demand of environmental monitoring for toxic and odorous ammonia gas it is desired to develop specific green, cost-effective and in situ passive colorimetric alternatives to current complex instrumentations. In this work, we designed an ammonia gas sensor based on cholesteric liquid crystal films of copper(II)-doped cellulose nanocrystals (CNC Cu(II)) whose structure, optical and sensing properties were investigated. The hybrid films using the low doping Cu(II) as a color-tuning agent inherited the chiral nematic signature and optical activity of CNCs, suggesting a strong chelation between copper ions and negatively charged CNCs. The sensing performance illustrates that the CNC Cu(II)125 film was sensitive to ammonia gas which could merge into nematic layers of CNCs and trigger-sensed to copper ions chelated on CNCs, consequently arousing a red-shift of reflective wavelength as well as an effective colorimetric transition. Such a hybrid film is anticipated to boost a new gas sensing regime for fast and effective on-site qualitative investigations.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2017
·
IF 3.671
Wenhang Wang,Xiaowei Zhang,Anguo Teng,Anjun Liu
Given a variety of distinguished aspect ratio-related characteristics of nanofiber cellulose (NFC), the impact of NFC on gelatin hydrogel performance involving strength, rheology, microstructure was investigated, focusing on concentration percolation mechanism for it. The inner topography displayed a compact three-dimensional network structure in the NFC-added gelatin gel, however, an NFC amount of 7.5 g kg −1 caused more inhomogeneous aggregation. Texture profile analysis showed that the addition of NFC increased the hardness but reduced the elasticity of gelatin gel at 10 °C, depending on NFC concentration. For static rheology, adding NFC transformed gelatin solution from the Newtonian action into pseudoplastic behavior at 60 °C, with a marked increase of viscosity. Furthermore, NFC improved the temperature of sol-gel transition of gelatin, even no obvious transformation as ≥5 g kg −1 NFC used. NFC reinforcement provides the potential to use as texture modifier along with gelatin in food field.
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Materials Today Communications
·
2024
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IF 3.7
Mohammad Raza Miah,Jiheng Ding,Hongran Zhao,Hao Wang,Qinchao Chu,Bin Fang,Lin Fan,Jinggang Wang,Jin Zhu
Most conventional plastic wraps for food packing and preservation have limited flexibility and relatively unique functions, seriously limiting their practical uses. However, smart and sustainable polyethylene 2,5-furandicarboxylate (PEF) polyester is currently employed for construction composite films to overcome this limitation. Herein, the fabrication of bio-based PEF/carboxylated cellulose nanofibers (CCNFs) blends films using PEF and CCNFs by a simple method involving layer-by-layer (LBL) assembly polymerization with exceptional mechanical and interfacial properties. In particular, the mechanical results revealed that the CP3 (1.0 wt% CCNFs) composite film had excellent mechanical properties like tensile strength (69.0 MPa), Young’s modulus (4.3 GPa), and toughness (1.26 MJ/m3), which is markedly higher than that of pure PEF film. Besides, the barrier results also demonstrated that CP3 blend film reduced the CO 2 and O 2 barriers by 13.4% and 11.2%, respectively, compared to pure PEF film. Consequently, FTIR, XPS, SEM/EDS, and AFM characterizations provide insight into the chemical composition, elemental distribution, morphology, and structural properties of CCNF that directly affect the PEF/CCNF composite. Notably, the barrier properties and fruit experiments revealed CP3 composite film, and the shelf life of fresh mangoes was extended by at least one week under ambient conditions (i.e., a relative humidity of 90–95%, a temperature of 30 °C, and natural light). These results indicate the practical use of CP3 composite film as a food packaging in next-generation, well-coated preservation films.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Jiang Liu,Zhaoheng Zhu,Yukun Huang,Long Wang,Kai Jia
There is a critical need to develop cost-effective and efficient adsorption materials for the removal of technetium-99 (99Tc) from contaminated water sources. This research presents the synthesis of amino-modified cellulose microspheres (CM-APTS) through the addition of 3-amino-propyl triethoxysilane (APTS) to regenerated cellulose microspheres (CM), followed by a subsequent reaction with ethylene dibromide (EDB) to produce halogen-modified amino cellulose microspheres (CM-APTS-EDB). These are engineered for the effective absorption of ReO4–, serving as a chemical surrogate for TcO4–. By altering the amount of ethylene dibromide used, two variations of bromine-modified cellulose microspheres, CM-APTS-EDBs and CM-APTS-EDBe, are synthesized. Among these, CM-APTS-EDBe exhibits robust adsorption capabilities for ReO4– across a pH spectrum of 2.5–10, attaining a peak capacity of 281 mg·g–1, and demonstrates selective adsorption of ReO4– even in the presence of competing anions such as NO3–, Cl–, and SO42–. Characterization through X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) indicates that the adsorption mechanism predominantly involves interactions between ReO4– and N+, hydrogen bonding with amino hydrogen, and σ-hole-anion interactions between Re–O and C–Br. After eight adsorption–desorption cycles, CM-APTS-EDBe retains notable stability and reusability. Additionally, the material efficiently captures ReO4– from simulated Hanford Low Activity Waste (LAW) wastewater, achieving an adsorption efficiency of 77.26% at a solid–liquid ratio of 40 g·L–1. This investigation underlines the potential of halogenated regenerated cellulose microspheres in designing advanced adsorbents for the removal of radioactive pollutants like TcO4–/ReO4–, offering a strategy for environmental remediation efforts.
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Advanced Materials Interfaces
·
2024
·Vol. 11
·期 35
·2400468
·
IF 4.3
Phuong-Linh Nguyen,Thi Ngat Tran,Minh Thang Le,Azeem Ullah,Duy-Nam Phan,Ick-Soo Kim
Cu-doped ZnO nanoparticle-loaded cellulose nanofiber membranes are investigated for their potential photocatalytic and antibacterial properties. ZnO nanoparticles, both undoped and doped with copper, are synthesized by the co-precipitation process, afterward immobilized onto cellulose nanofibers through the utilization of a dip-coating technique. Methylene blue (MB) removal is evaluated to inspect the effectiveness of photocatalysts in both UV and Xenon lighting conditions. The morphology and structure of the composite cellulose nanofibers loaded with photocatalysts are then examined using FE-SEM, TEM, XRD, FTIR, and UV–vis characterizations. Under visible light, the self-cleaning effects of organic compounds are measured, presenting more than 50% of discoloration for various organic stains. The antibacterial activity is assessed using the Kirby–Bauer disc diffusion method and the plate counting method against the gram-positive Staphylococcus aureus (S. aureus) and gram-negative Escherichia coli (E. coli) bacteria. The current study shows that cellulose nanofibers coated with Cu-doped ZnO nanoparticles exhibited excellent photocatalytic and antibacterial activities.
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CONSTRUCTION AND BUILDING MATERIALS
·
2024
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IF 7.4
Penggang Wang,Chenglong Li,Zhenxing Du,Li Tian,Zhiyu Yuan,Hua Fu,Weichao Li,Shuo Jiang
This study investigates the enhancement of self-healing properties in cementitious materials through the integration of nano-SiO 2 (NS)-modified ethyl cellulose (EC) microcapsules (MC). By utilizing an organic-inorganic hybridization approach, we created a stable three-dimensional cross-linked structure composed of NS and EC, resulting in a controllable system that enhances the triggering efficiency of the microcapsules. Comprehensive microscopic characterization of the material composite MC was performed, encompassing evaluations of morphology, elemental composition, chemical structure, and particle size. The results demonstrate that the incorporation of NS significantly increases both the surface roughness and particle size of the MC, thereby improving mechanical interlocking with the cement matrix. Optimal self-healing performance was observed with an NS content of 6 % of EC, achieving an impressive compressive strength recovery rate of 151.2 % under pre-damage conditions corresponding to 80 % σ max . Moreover, the pore healing rate also peaked at this NS concentration, highlighting a synergistic effect on the self-healing capabilities of the cementitious composites. Furthermore, observations regarding crack healing confirm that the self-healing mortar formulated with NS-modified MC demonstrates superior crack closure performance compared to unmodified MC. These findings highlight the positive correlation between NS content and enhanced self-healing capabilities, offering valuable insights for the advancement of self-healing systems in cement-based materials.
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Biomaterials Advances
·
2024
·
IF 5.5
Manjila Adhikari,Bianza Moise Bakadia,Li Wang,Ying Li,Zhijun Shi,Guang Yang
Effective treatment of infected wounds remains a challenge due to the rise of antibiotic-resistant microorganisms. The development of advanced materials with strong antimicrobial properties is necessary to address this issue. In this study, a unique composite of electrically modified bacterial cellulose (EBC) with allantoin (ABC) and zein was developed by dipping diffusion method. Morphological structural analysis revealed a uniform distribution of zein and aligned fibers, confirming the synthesis of the ABC-Zein composite. The formation of ABC-Zein was further confirmed by attenuated total reflection-Fourier transform infrared (ATR-FTIR), which displayed additional peaks corresponding to EBC, indicating the incorporation of zein into ABC. X-ray diffraction (XRD) analysis of ABC-Zein demonstrated a similar crystalline structure with EBC. The ABC-Zein showed mechanical integrity (tensile strength: 1.15 ± 0.21 MPa), thermal stability (degradation temperature: 290 °C), porous structure (porosity: 40.23 ± 0.21 %), and hydrophilic (water contact angle: 53.3 ± 5.3°) properties. Furthermore, the antimicrobial agent terpinen-4-ol (T4O), derived from tea tree oil, was incorporated into the ABC-Zein composite. Biological studies confirmed the antimicrobial efficacy ( Staphylococcus aureus inhibition: 88.5 ± 7.19 %) and biocompatible (cell viability: 84.95 ± 5.6 %, hemolysis: 4.479 ± 0.39 %) nature of the T4O-ABC-Zein composite. The combined effects of the aligned fiber structure, zein protein, and antimicrobial T4O significantly enhanced infected wound healing by day 7, promoting inflammatory response, granular tissue formation, cell proliferation, and angiogenesis. By day 14, T4O-ABC-Zein facilitated complete wound healing, with reepithelization, collagen I deposition, and downregulation of CD 31, Ki67, and α-SMA. Overall, the innovative T4O-ABC-Zein composite, with an aligned fiber structure, improved biocompatibility, and antimicrobial properties, holds significant potential for the treatment of infected wounds.
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