IRANIAN POLYMER JOURNAL
·
2021
·Vol. 30
·期 11
·1159-1168
·
IF 1.899
Guo Wenhui,Yang Mingcheng,Liu Shubo,Zhang Xiuqiang,Zhang Benshang,Chen Yang
The development of easy and cost-effective strategies for making multifunctional hydrogels is of great scientific interest. Here, a chitosan/polyvinyl alcohol/tannic acid (CS/PVA/TA) composite hydrogel was prepared by a simple method of γ-ray-induced crosslinking and immersion in TA solution. The chemical composition, transparency, microstructure, mechanical properties and antibacterial activity of the obtained composite hydrogel were characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy, scanning electron microscopy (SEM), tensile measurement, and antibacterial test, respectively. The immersion in TA not only provided a CS ( M w 20,000 g.mol −1 )/PVA composite hydrogel with improved mechanical performance, i.e., tensile strength and elongation-at-break increased by 1100 and 487%, respectively, but also it preserved high transparency of the pure irradiated PVA hydrogel (transmittance exceeded 50% at 660 nm). In addition, the composite hydrogel possessed good antibacterial activity against gram-negative and gram-positive bacteria. The rationality of the immersion TA method in principle was proved by the hydrogen bond simulation. This work provides a simple method for the preparation of multifunctional hydrogels, suitable for large-scale production, and is expected to promote their application in the fields of biomedicine and wound dressings. Graphic abstract
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Zhi Xu,Guozhen Liu,Hua Ye,Wanqin Jin,Zhanfeng Cui
Pervaporation dehydration is an energy efficient process for purifying organic solvents , whose application depends on the development of highly permeable and selective membranes. In this work, synthesized two-dimensional Ti 3 C 2 T x MXene nanosheets were incorporated into chitosan (CS) to fabricate a new MXene/CS mixed-matrix membrane used for solvent dehydration via pervaporation process. The morphology, chemical structure and surface hydrophilicity of the membranes were studied by SEM, AFM, IR, XPS and water contact angle measurement. Three kinds of organic solvents , ethanol, ethyl acetate and dimethyl carbonate were used for evaluating the membrane dehydration performance. The results indicated that incorporation of MXene nanosheets did not increase the surface sorption , whereas the assembled MXene laminates with interlayer channels greatly enhanced the permeation of water molecular through the membrane. Thus, flux and separation factor of CS membrane were simultaneously improved by introducing the MXene nanosheets . Specifically, the optimized 3 wt% MXene/CS MMM exhibited total flux of ~ 1.4–1.5 kg/(m 2 h) and separation factor of 1421, 4898 and 906 for dehydration of ethanol, ethyl acetate and dimethyl carbonate at 50 °C, respectively.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 5
·51593
·
IF 3.125
Xinyu Wang,Chenyu Zhou,Shengsong Dai,Junjie Wang,Zhiquan Pan,Hong Zhou
A bio-based flame retardant (PDE) was synthesized through a facile one-pot reaction of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) with protocatechualdehyde and ethanol. PDE was fully characterized by fourier transform infrared spectroscopy (FTIR), 1 H NMR, 31 P NMR and ESI-MS. Epoxy resin (EP) with 9 wt% PDE (EP/9%PDE) passed UL94 V-0 rating and possessed the limited oxygen index (LOI) value of 33.2%, the curved EP thermosets kept transparent. When chitosan (CS) was used to replace one-third of PDE in EP/9% PDE, the modified EP also passed UL94 V-0 rating with the LOI value of 32.3%, the curved thermosets kept transparent and owned better absorption effect toward ultraviolet light. Cone calorimeter test and TG-FTIR analysis were performed on the EP samples, the chars after burning were characterized by scanning electron microscope (SEM), energy-dispersive X-Ray spectroscopy (EDX), Raman spectrum and FTIR. The results showed that the synergistic effect of PDE-CS on flame retardant was ascribed to the protective effect of denser char layer, the release of some phosphorus containing free radicals and the dilution effect of released nonflammable gases such as H 2 O and CO 2 .
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高影响因子
MOLECULES
·
2018
·Vol. 23
·期 10
·2604
·
IF 3.098
Lijie Wei,Yuan Chen,Wenqiang Tan,Qing Li,Guodong Gu,Fang Dong,Zhanyong Guo
In this study, a series of triple quaternized chitosan derivatives, including 6-O-[(2-hydroxy-3-trimethylammonium)propyl]-2-N-(1-pyridylmethyl-2-ylmethyl)-N,N-dimethyl chitosan chloride (7), 6-O-[(2-hydroxy-3-trimethylammonium)propyl]-2-N-(1-pyridylmethyl-3-yl- methyl)-N,N-dimethyl chitosan chloride (8), and 6-O-[(2-hydroxy-3-trimethylammonium)propyl]- 2-N-(1-pyridylmethyl-4-ylmethyl)-N,N-dimethyl chitosan chloride (9) were successfully designed and synthesized via reacting epoxypropyl trimethylammonium chloride with theN-pyridinium double quaternized chitosan derivatives. Detailed structural characterization was carried out using FT-IR and1H-NMR spectroscopy, and elemental analysis. Besides, the activity of the triple quaternized chitosan derivatives against three common plant pathogenic fungi,Watermelon fusarium,Fusarium oxysporum, andPhomopsis asparagi, was investigated in vitro. The results indicated that the triple quaternized chitosan derivatives had enhanced antifungal activity when compared to double quaternized chitosan derivatives and chitosan, especially at 1.0 mg/mL, which confirmed the theory that the higher density of positive charge contributed to the antifungal activity. Moreover,8with an almost 99% inhibitory index showed the better antifungal activity againstWatermelon fusarium. Moreover, the cytotoxicity of the products was also evaluated in vitro on 3T3-L1 cells and all the triple quaternized chitosan derivatives exhibited low cytotoxicity. These results suggested that triple quaternized chitosan derivatives may be used as good antifungal biomaterials.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 50
·76263-76274
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IF 5.19
Zhou Anhui,Qiu Zhaofu,Yang Ji,Yan Ruiqi
The all-vanadium redox flow battery (VRFB) is becoming a promising technology for large-scale energy storage due to its advantages such as scalability and flexibility. In recent years, the VRFB has been successfully developed and put into use in many countries. It is expected that the abandoned VRFB will generate a large amount of vanadium waste. To our knowledge, there are few reports on the disposal of spent VRFBs. Herein, chitosan-coated nano-zero-valent iron (CS-Fe 0 ) is proposed for the first time as adsorbents for the treatment of spent VRFBs. It can provide a new approach to deal with the upcoming large number of spent VRFBs. The calculated maximum adsorption capacity for V(V) of chitosan and CS-Fe 0 reached 209.5 and 511.3 mg/g at 288 K, respectively. CS-Fe 0 showed better adsorption performance than chitosan under different pH conditions and is easy to be separated from the liquid phase. The Freundlich isotherm was suitable for the adsorption process of chitosan, and CS-Fe 0 was more consistent with the Langmuir isotherm. Ionic strength (0.05–0.5 M) had a positive effect on the adsorption capacity of CS-Fe 0 , and the influence of coexisting anions on CS-Fe 0 could be negligible. FTIR and XPS analyses revealed that the primary mechanisms were the electrostatic attraction of chitosan and redox of Fe 0 . The present study confirmed that CS-Fe 0 could be a potential material to efficiently trap V(V) from the VRFB electrolyte.
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高影响因子
Micromachines
·
2020
·Vol. 11
·期 6
·580
·
IF 2.524
Lei Li,Guangming Li
Chitosan (CS) is one of the commonly affluent polysaccharides that are attractive biomaterials as they are easily found in different organisms and are biocompatible. An environment-friendly multi-bit biomemory was successfully achieved on the basis of CS as a favorable candidate for resistive-switching memory applications. By incorporating graphene oxide (GO) into CS, the multi-bit biomemory device (indium tin oxide (ITO)/CS:GO/Ni) was obtained through the solution-processable method, which had a high current ratio among a high, intermediate, and low resistance state as well as a low SET/RESET voltage. GO acting as trapping sites in the active layer might be responsible for the biomemory mechanism. This research opens up a new avenue towards renewable and environmentally benign CS-based materials for biodegradable electronic devices.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Min Lu,Shangke Yu,Zuxin Wang,Qiangwei Xin,Tong Sun,Xin Chen,Zhiyao Liu,Xingyu Chen,Jie Weng,Jianshu Li
As a biocompatible natural polymer material, chitosan (CS) is widely used in biomedical fields due to its excellent properties such as antibacterial ability. However, the main drawback of chitosan is that it cannot dissolve in water, seriously limiting its application in biomedical field. In this study, CS was successfully modified with a zwitterionic 2-(methyl acryloyoxy) ethyl choline phosphate (MCP) monomer by Michael addition reaction to obtain choline phosphate functionalized chitosan (CS-MCP). The CS-MCP exhibited an excellent water solubility. The antibacterial activity of CS-MCP was tested against S. aureus and E. coli in vitro , the results indicated that the antibacterial property of CP-MCP dissolved in water was as well as that of CS dissolved in acetic acid. The studies of cytotoxicity and hemolysis of CS-MCP showed that CS-MCP had excellent cytocompatibility and low hemolysis ratio. Thus, the water soluble chitosan derivative CS-MCP with good antibacterial ability and biocompatibility has great potential in biomedicine.
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高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Zeyu Qin,Xiwen Jia,Qian Liu,Baohua Kong,Hao Wang
In this study, electrospun chitosan/pullulan composite nanofiber films were crosslinked by two green methods (heating and cinnamaldehyde). With the increase of chitosan content, the morphology results indicated that the nanostructures of thermal crosslinking chitosan/pullulan (TCP) and cinnamaldehyde crosslinking chitosan/pullulan (CCP) nanofiber films became more stable. The decreases in weight loss (83.65 % to 43.85 % for TCP and 23.42 % to 15.58 % for CCP) and the increases in water contact angle (31.8° to 54.1° for TCP and 83.65 % to 43.85 % for CCP) confirmed the improved water stability. The decreases in water vapor permeability indicated that the crosslinking processes significantly improved the barrier properties of the films. Mechanical and thermal properties of TCP and CCP films were enhanced respectively. Furthermore, the corresponding properties of CCP films were more excellent than TCP films. FTIR results indicated the occurrence of Maillard reaction during the thermal crosslinking process and Schiff base reaction during the cinnamaldehyde crosslinking process.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Song Lv,Liya Ma,Xinyu Shen,Hua Tong
To achieve high-performance supercapacitors, nitrogen and sulfur co-doped porous chitosan hydrogel-derived carbons (CHC-SK) are successfully prepared by one-step carbonization. In the synthesis, two effective strategies of structure design and heteroatom doping are both used to increase capacitance of carbon materials. To control and design of structure, potassium citrate as a novel pore-former is introduced into chitosan hydrogel systems. It plays three roles in pore formation and thereby can be effective to optimize structure and improve surface area of CHC-SK. In addition, thiourea as binary doping of nitrogen and sulfur can effectively maximize the pseudocapacitance of CHC-SK. Therefore, CHC-SK with large surface area (1596.4 m 2 g −1 ) and high heteroatom content (5.43% for nitrogen, 2.62% for sulfur) show excellent electrochemical performances. The specific capacitance of CHC-SK reaches up to 366.8 F g −1 at 0.5 A g −1 . Even at the high current density of 10A g −1 , its capacitance retention is 97.1% for 10,000 cycles. This simple strategy for the synthesis of nitrogen and sulfur co-doped porous chitosan hydrogel-derived carbons with high specific capacitance has promising applications in the future.
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高影响因子
Journal of Environmental Sciences
·
2021
·
IF 5.565
Xuefeng Xiao,Yuanyuan Yu,Yongjun Sun,Xing Zheng,Aowen Chen
In this study, three magnetic flocculants with different chelating groups, namely, carboxymethyl chitosan-modified Fe 3 O 4 flocculant (MC), acrylamide-grafted magnetic carboxymethyl chitosan flocculant (MCM), and 2-acrylamide-2-methylpropanesulfonic acid copolyacrylamide-grafted magnetic carboxymethyl chitosan flocculant (MCAA) were prepared, synthesized, and characterized by photopolymerization technology. They were applied to the flocculation removal of Cr(III), Co(II), and Pb(II). The effect of flocculation condition on the removal performance of Cr(III), Co(II), and Pb(II) was studied. Characterization results show that the three magnetic carboxymethyl chitosan-based flocculants have been successfully prepared with good magnetic induction properties. Flocculation results show that the removal rates of MC, MCM, and MCAA on Cr(III) are 51.79%, 82.33%, and 91.42%, respectively, under the conditions of 80 mg/L flocculant, pH value of 6, reaction time of 1.5 hr, G value of 200 s −1 , and precipitation magnetic field strength of 120 mT. The removal rates of Co(II) by MC, MCM, and MCAA are 54.33%, 84.99%, and 90.49%, respectively. The removal rates of Pb(II) by MC, MCM, and MCAA are 61.54%, 91.32%, and 95.74%, respectively. MCAA shows good flocculation performance in composite heavy metal-simulated wastewater. The magnetic carboxymethyl chitosan-based flocculant shows excellent flocculation performance in removing soluble heavy metals. This research provides guidance and ideas for the development of efficient and low-cost flocculation technology to remove heavy metals in wastewater.
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高影响因子
ACS Sensors
·
2018
·
IF 5.711
Jieyao Song,Hongjian Zhou,Rui Gao,Yong Zhang,Haimin Zhang,Yunxia Zhang,Guozhong Wang,Po Keung Wong,Huijun Zhao
Selective determination of aquatic chromium is critically important because of the dramatic differences in health and environment impacts by trivalent and hexavalent forms of chromium; however, it is challenging. In this work, for the first time, a nonconjugated polymer fluorophore (GCPF) was synthesized by cross-linking chitosan with glutaraldehyde via Schiff base reactions and systematically investigated for selective determination of Cr(VI). The results revealed that the synthesized GCPF exhibited excellent photostability and water solubility. More importantly, GCPF possessed dramatically enhanced fluorescence intensity originated from the n−π* transitions of the Schiff base subfluorophore groups (e.g., C═N) that can be selectively and sensitively quenched by Cr(VI) through oxidative damages to C═N group. An effective EDTA masking agent approach was employed to minimize ionic interferences. In the presence of high concentration of interference ions including Cr(III), the quenching GCPF fluorescence is capable of selectively determining Cr(VI) within a concentration range up to 50 μM and a detection limit of 0.22 μM. The analytical performance of GCPF was also confirmed by analyzing real surface water and industrial samples.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Dezhi Yang,Lingbing Qiu,Yaling Yang
Glutaraldehyde cross-linked chitosan-coated Fe3O4 nanocomposites (MCNPs) were successfully synthesized for the removal of methyl orange (MO) from wastewater. Experimental conditions such as the pH, cation surfactant dosage, nanoadsorbent dosage, and ionic strength were also investigated. Kinetics date was better fit by a pseudo-second-order model, indicating that adsorption was the rate-limiting step. The Freundlich models (R2 = 0.9794) fit the experimental data better than the Langmuir models, and the theoretical maximum adsorption capacity was 758 mg g–1. The values of the Gibbs free energy (ΔG° = −7.27 kJ mol–1), enthalpy (ΔH° = 0.001 kJ mol–1), and entropy (ΔS° = 23.58 J mol–1) indicated the spontaneous and endothermic process of MO adsorption. The prepared MCNPs showed 96–98% adsorption of MO by adding 0.2 mg of cationic surfactant cetyltrimethylammonium bromide (CTAB) to form mixed hemimicelles and can be easily regenerated with a 0.1 mol L–1 HCl solution.
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高影响因子
危险品化学品经营许可证（带存储）