International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chengcheng Ma,Jianguo Liu,Qi Wang,Wei Wang
The oxetane-substituted chitosan-polyurethane (OXE-CHI-PUR) film was synthesized using a simple, fast, and low-cost process, which is attractive for its many applications in the fields of self-healing anticorrosion. In this work, the OXE-CHI-PUR films with outstanding anticorrosion and self-healing performances were incorporated in epoxy resin coatings. SEM confirmed that the diameter of the OXE-CHI-PUR network film was approximately 380 μm (±4 μm). FT-IR measurement proved that successful synthesis of the OXE-CHI-PUR network film. It is visually observed through the confocal laser scanning microscope that the scratched OXE-CHI-PUR coating has a self-healing tendency with UV irradiation. The electrochemical impedance spectroscopy (EIS) experiments analyzed the self-healing performance of OXE-CHI-PUR coating. The results of EIS and 14 days’ seawater immersion tests revealed that the coating containing OXE-CHI-PUR films showed high anticorrosion performance and exhibited self-healing capabilities due to the influence of light and heat.
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高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 7
·075404
·
IF 1.449
Li Chen,Hao Jiang,Yaomin Li,Bhahat Lawlley Zimba,Xunzhi Yu,Chang Chen,Guoxi Xiong,Qingzhi Wu
In this work, pure chitosan (CS) nanofibrous membranes were successfully fabricated by electrospinning using the mixed solvent of trifluoroacetic acid (TFA) and dichloromethane (DCM). The influences induced by both the ratio of TFA and DCM and the concentration of CS in the electrospinning solution were analyzed. In order to improve the mechanical properties of pure CS nanofibrous membranes, graphene oxide (GO) nanosheets were incorporated into the CS nanofibers. The results show that the incorporation of GO nanosheets into CS nanofibers significantly improved both the tensile strength and Young's modulus of CS nanofibrous membranes. When the content of GO was 0.8%, the tensile strength and Young's modulus of CS/GO nanofibrous membrane were enhanced approximate 2 and 3 times, respectively, compared with that of pure CS nanofibrous membranes. There resulst provide promising potential for CS/GO nanofibrous membranes in biomedical applications, such as tissue engineering, wound healing, and drug delivery.
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高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2018
·
IF 1.454
Chuandong Zhang,Jiangquan Ma,Yun Zhao,Zhengping Li,Wenjie Liu,Chao Yao
In this article, highly efficient magnetic chitosan nanoparticles were prepared by the glutaraldehyde cross-linking method and then chemically-modified with amino groups through reaction between triethylenetramine and glycidyl methacrylate. The adsorption kinetics and isotherms of these novel adsorbents fit the pseudo-second-order model and the Langmuir model. The maximum adsorption capacities were 293 mg/g at pH = 4.3 and t = 1.4 hours. The rate-limiting step was the chemical adsorption. Further recycling experiments showed that the adsorbent provided the potential regeneration and reuse after adsorbing Cu2+. All the experimental results demonstrated that the adsorbent had a potential application in Cu2+ removal from wastewater.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
·
IF 3.582
Weimin Chen,Zhenyu Zhu,Lili Yang
Catalytic performances of the Pd catalyst towards ethanol electro-oxidation in alkaline media are improved by employing a hybrid carbon support composed of chitosan-functionalized carbon nanotubes and graphite nanoplates . Series of characterization results reveal that Pd nanoparticles have a uniform distribution on the hybrid support with small particle sizes. Electrochemical measurements indicate that the hybrid carbon material-supported Pd catalyst has a large electrochemical active surface area , a high catalytic activity as well as a good poison resistance towards ethanol electro-oxidation. This is attributed to the unique structure of the hybrid carbon support. The stacking of the two-dimensional graphene nanoplates is prevented by carbon nanotubes, thus the surfaces of the support are sufficiently utilized. Chitosan serves as a non-covalent functionalization reagent facilitating the uniform blending of graphene nanoplates and carbon nanotubes. In addition, X-ray photoelectron spectra reveal that chitosan interacts with Pd nanoparticles via the synergistic interaction. This interaction contributes to the high catalytic activity and the good poison resistance of the catalyst towards ethanol electro-oxidation.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 5
·1164-1171
·
IF 2.578
Mengmeng Song,Meng Zhou,Hengfeng Hu,Heqing Fu
First, attapulgite-Fe 3 O 4 magnetic filler (ATP-Fe 3 O 4 ) was prepared by using a chemical precipitation method. Subsequently, graphite oxide (GO) was prepared through Hummer method, and then reduced GO (RGO) was prepared through GO reduced by chitosan (CS). Finally, a series of WPU-RGO/ATP-Fe 3 O 4 /CS composites were prepared by introduced RGO/ATP-Fe 3 O 4 /CS to waterborne polyurethane. The structure and properties were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), X-ray diffraction (XRD), vibrating sample magnetometry (VSM), thermogravimetric analysis TGA, conductivity test, and tensile test. The experimental results indicated that thermal stability and tensile strength of nanocomposites were improved with the increase of the content of RGO/ATP-Fe 3 O 4 /CS. Meanwhile, with the increase of the RGO/ATP-Fe 3 O 4 /CS content, the electrical and magnetic properties of WPU-RGO/ATP-Fe 3 O 4 /CS composites were improved. When the content of RGO/ATP-Fe 3 O 4 /CS was 8 wt%, the electrical conductivity and the saturation magnetic strength of WPU-RGO/ATP-Fe 3 O 4 /CS composites were 3.1 × 10 −7 S·cm −1 and 1.38 emu/g, respectively. WPU-RGO/ATP-Fe 3 O 4 /CS composites have excellent electrical and magnetic properties.
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高影响因子
CARBOHYDRATE POLYMERS
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2020
·
IF 7.182
Jinfeng Cao,Yang Wang,Chen He,Yanhui Kang,Jinping Zhou
A dual physically crosslinking (DPC) strategy is used to construct hydrogels with ultrahigh strength. First, polyelectrolyte complex (PEC) hydrogels were prepared through in situ polymerization of acrylic acid monomers in chitosan solutions. Subsequently, cations and anions were introduced into the PEC hydrogels to form strong electrostatic interactions with the polymer chains. The mechanical properties of the DPC hydrogels strongly depended on the ionic concentration and the valence state of the loading ions. The tensile strength of DPC-Na 8-20-2.0, DPC-Mg 8-20-2.0, DPCAl 8-20-2.0 and DPC-Sul 8-20-0.8 reached to 2.36, 12.59, 65.1 and 2.80 MPa, respectively, which were significantly higher than that of PEC 8-20 (0.29 MPa). Moreover, DPC-Na, DPC-Mg and DPC-Sul still maintained a good flexibility. Specifically, hydrogels of DPC-Ca exhibited ionic conductivity and freeze tolerance, which could be cooled to −20 °C without freezing. The DPC strategy opens an avenue to fabricate hydrogels with outstanding mechanical properties.
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高影响因子
Food Packaging and Shelf Life
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2022
·
IF 8.749
Yingping Lai,Weitong Wang,Jiajia Zhao,Song Tu,Yingwu Yin,Liyi Ye
This work aims to develop degradable packaging films based on chitosan (CS) and Na-montmorillonite (MMT). The effect of citric acid (CA) on the properties of prepared films (MCS/CAs) was also investigated. MMT shows excellent compatibility in CS. Results from Fourier transform infrared spectroscopy , scanning electron microscopy , and thermogravimetric analysis indicated an improvement in the structural and thermal properties of the films after incorporating MMT into the CS matrix. Despite the reduced tensile strength , the composite films with CA loaded exhibited better swelling resistance and higher elongation at break (68%). MCS/CA-c (loaded with 80% CA) was employed to package cherry tomatoes so as to improve its conservation. Results showed improved physical/chemical properties (weight loss ratio, total soluble solids, titratable acidity, and ascorbic acid) of wrapped cherry tomatoes. Therefore, results reveal the potential of MCS/CAs films as degradable packaging material .
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Kewang Zheng,Sa Xiao,Wei Li,Wei Wang,Hujian Chen,Fan Yang,Caiqin Qin
Edible films from chitosan (CH) containing various amount of acorn starch (AS) and eugenol (Eu) were developed by casting and solvent-evaporation method, and their physico-chemical, barrier, antimicrobial, antioxidant and structural properties were also investigated. The experimental data showed that an appropriate proportion of AS could improve the mechanical and barrier properties of the film, and the incorporation of Eu in the film significantly improved the flexibility, barrier, hydrophobicity , antimicrobial and antioxidant properties. The results showed that the optimum comprehensive properties of the film were obtained when the mass ratio of AS to CH was 0.9 and the content of Eu was 9%. Possible intermolecular interactions between CH, AS and Eu were confirmed by Fourier-transform infrared spectroscopy (FTIR). SEM indicated that a good compatibility was present between CH and AS, and Eu was well emulsified and dispersed in the film matrix network. TG and DTG curves further confirmed Eu present in the film matrix network. Such edible films can provide new ways for packaging industries in developing active packaging materials.
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高影响因子
Desalination and Water Treatment
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2014
·
IF 0.987
Qian Liu,Bingchao Yang,Lujie Zhang,Ruihua Huang
A multifunction adsorbent, activated carbon (AC)/chitosan composite, was synthesized by incorporating AC into chitosan based on the ratio of AC to chitosan being 1/1. The simultaneous adsorption of aniline and Cu2+ from aqueous solution onto AC/chitosan composite was investigated by a batch procedure. These results showed that an adsorbent dosage of 0.3 g was appropriate, and a contact time of 210 min was convenient for reaching adsorption equilibriums for aniline and Cu2+. The simultaneous adsorption of aniline and Cu2+ was realized in a wide pH range. The adsorption process obeyed the pseudo-second-order kinetic model. The adsorption behaviors of aniline and Cu2+ followed Freundlich and Langmuir, respectively. No obvious competitive adsorption existed between Cu2+ and aniline.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
·
IF 2.76
Zhengyang Li,Tingting Li,Libao An,Huan Liu,Linnan Gu,Zhiming Zhang
Chitosan/polycaprolactam (PA6) nanofibrous filter paper (NFP) was prepared by electrospinning technique. Characterization with Fourier transformation infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) indicated that there was weak interaction (hydrogen bonds) between PA6 and chitosan, and the average diameter of the composite nanofibers decreased as the chitosan content was increased. The maximum adsorption capacity of Cr(VI) on the NFP via filtration (114.7 mg g −1 ) was much higher than that via static adsorption (81.7 mg g −1 ) and shaking adsorption (80.7 mg g −1 ). Because the Cr(VI)-containing solution was forced to flow through the whole membrane in filtration, the chelation sites inside the membrane could be exploited, leading to the enhancement of the Cr(VI) adsorption. The hydrogen bonds between chitosan and PA6 could enhance the mechanical strength and the acid fastness of the NFP. Therefore, the NFP desorbed by H 2 SO 4 can be well reinstated, and the adsorption capacity of Cr(VI) decreased slightly (only 17.9%) after three filtration cycles. On the basis of X-ray photoelectron spectroscopy (XPS) analysis, the possible mechanism for the Cr(VI) removal was that Cr(VI) was initially adsorbed on the NFP due to the electrostatic attraction, and subsequently reduced to the less toxic form Cr(III) by the amino groups of chitosan.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2015
·
IF 4.529
Hongxiang Ou,Qunhui Chen,Jianming Pan,Yunlei Zhang,Yong Huang,Xueyong Qi
Magnetic imprinted polymers (MIPs) were synthesized by Pickering emulsion polymerization and used to adsorb erythromycin (ERY) from aqueous solution. The oil-in-water Pickering emulsion was stabilized by chitosan nanoparticles with hydrophobic Fe 3 O 4 nanoparticles as magnetic carrier. The imprinting system was fabricated by radical polymerization with functional and crosslinked monomer in the oil phase. Batches of static and dynamic adsorption experiments were conducted to analyze the adsorption performance on ERY. Isotherm data of MIPs well fitted the Freundlich model (from 15 °C to 35 °C), which indicated heterogeneous adsorption for ERY. The ERY adsorption capacity of MIPs was about 52.32 μmol/g at 15 °C. The adsorption kinetics was well described by the pseudo-first-order model, which suggested that physical interactions were primarily responsible for ERY adsorption. The Thomas model used in the fixed-bed adsorption design provided a better fit to the experimental data. Meanwhile, ERY exhibited higher affinity during adsorption on the MIPs compared with the adsorption capacity of azithromycin and chloramphenicol. The MIPs also exhibited excellent regeneration capacity with only about 5.04% adsorption efficiency loss in at least three repeated adsorption–desorption cycles.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Binqing Zhao,Qi Zhou,Chenxi Lou,Xinpeng Jin,Wei Li
Carbon dioxide (CO 2 ) assisted synthesis of water-soluble silver nanoparticle with a narrow particle size distribution is reported here based on the phase-inversion procedure. Bio-derived chitosan (CS) is used to stabilize the metal nanoparticles according to its abundant functional groups. Formic acid is employed as both a solvent (for the polymer) and a reductant for in-situ reducing the silver precursor along with the solvent evaporation. CO 2 is utilized to combine with the amino groups of CS, reducing the viscosity of chitosan/formic acid solution and limiting the formation of hydrogen bonds . This promotes the stabilization and reduction efficiency of silver nanoparticles. In particular, 100% of Ag metal nanoparticles with the size of 7.5 ± 2.3 nm is successfully synthesized with the assistance of CO 2 . Interestingly, the synthesized CS/Ag nanocomposites are water-soluble owing to the formation of carbamate groups. This water-soluble silver nanoparticle presents an exceptional performance in the selective reduction of 4-nitrophenol, where the turnover frequency (TOF = 599 h −1 ) is even double with respect to the CO 2 free system.
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高影响因子
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