COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Nana He,Lili Li,Panpan Wang,Junhao Zhang,Jiaqi Chen,Jie Zhao
Herein, titanium dioxide/chitosan/poly(lactide-co-caprolactone) (TiO 2 /CS/P(LLA-CL)) composite membranes with highly efficient adsorption of copper ions (Cu(II)) in aqueous solution were developed, through a facile electrospinning method. First, TiO 2 nanoparticles were ultrasonically dispersed in CS/P(LLA-CL) solution to get a uniform suspension. Afterwards, the mixture was applied for electrospinning to generate the smooth and bead-free composite membranes. The high adsorption capability of the composite membranes on Cu(II) was mainly attributed to the combination of TiO 2 nanoparticles, CS/P(LLA-CL) matrix and nanosized membrane. Among those, the TiO 2 /CS/P(LLA-CL) composite membrane with 2% TiO 2 content demonstrated the maximum adsorption capability (˜190.5 mg g −1 ) for Cu(II) from aqueous solution. Their adsorption behaviors were well conformed to pseudo-second-order kinetic model and Langmuir isotherm model. Moreover, FTIR and XPS results confirmed the existed chelation and ion exchange between the membrane and the Cu(II) during adsorption process. Due to its simplicity, effectiveness and stability in water, this type of composite membrane may serve as a promising environmentally-friendly and non-toxic adsorbent for removal of Cu(II) in aqueous.
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RENEWABLE ENERGY
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2019
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IF 5.439
Nisakorn Saengprachum,Dongren Cai,Mantian Li,Ling Li,Xiaocheng Lin,Ting Qiu
Via the crosslinking of chitosan and sulfosuccinic acid (SSA), the acidic chitosan membrane (ACM) was prepared for biodiesel production from esterification of oleic acid and methanol. ATR-FTIR, TGA, XRD, SEM and EDX were applied to characterize the prepared ACM. The acidic site density and swelling capacity of the prepared ACM were investigated. The ACM possessed the 4.62 mmol/g of acidic site density, which was just a little less than 4.76 mmol/g of Amberlyst-15, meanwhile, ACM was proven to be much higher than Amberlyst-15 in swelling capacity. Under the same reaction, the 98.76% of conversion can be obtained while the Amberlyst-15 only reached 44.30%. The optimization of process variables was conducted by the combination of single factor experiment and Box-Behnken design (BBD) response surface methodology . The catalytic activity of ACM in different esterification of fatty acids and alcohols was also investigated. And the catalytic mechanism of esterification catalyzed by ACM was clarified. Based on the catalytic mechanism, the kinetic model was established to describe the esterification and obtain relevant kinetic parameters ( E a + , E a − , A + and A - ), meanwhile, the kinetic results were compared to the same reaction with different catalysts in detail. Besides, the reusability of the prepared ACM was studied.
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POLYCYCLIC AROMATIC COMPOUNDS
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2019
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IF 1.237
Chunmiao Zhu,Yinhai Lang,Ben Liu,Huaxuan Zhao
Chitosan/reed biochar composite (CRBC) was synthesized and employed as an adsorbent to remove ofloxacin (OFL) from aqueous solution. The physical and chemical properties of CRBC were characterized by SEM, FTIR, and BET surface area. The initial OFL concentration, solution pH, and ion strength affecting the adsorption process were investigated. Batch adsorption experiments revealed that OFL adsorption amounts on CRBC increased with the increasing of initial OFL concentration. Furthermore, the solution pH and ion strength had significant effects on OFL adsorption. The adsorption was enhanced in neutral pH condition and was inhibited by the presence of NaCl. The adsorption kinetics was fitted by the pseudo-second-order model with higher correlation coefficients. The adsorption isotherms were better described by the Langmuir model, indicating monolayer adsorption process. The aim of current work was to develop a reed biochar and chitosan composite and explore the adsorption behavior of OFL.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
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IF 4.784
Ze-yu Qin,Xi-Wen Jia,Qian Liu,Bao-hua Kong,Hao Wang
In this study, Chitosan/pullulan composite nanofiber fast dissolving oral films (FDOFs) were prepared via electrospinning technology. The ratio of chitosan/pullulan (C/P) had an influence on solution property and nanofiber morphology, with the increase of chitosan, viscosity and conductivity of solutions increased, the morphology obtained by scanning electron microscopy indicated that the diameter of nanofibers decreased initially then increased. The Fourier transform infrared spectra indicated hydrogen bond interactions between chitosan and pullulan molecules. X-ray diffraction analysis proved that electrospinning process decreased the crystallinity of materials. Thermal analysis showed that melting point, degradation temperature and glass transition temperature increased with the addition of chitosan content in the FDOF. Water solubility test proved that the FDOF can dissolve in water completely within 60 s. Finally, in order to prove its practicability in future, a model drug of aspirin was encapsulated in the FDOF successfully.
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PubMed
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SURFACE & COATINGS TECHNOLOGY
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2020
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IF 3.784
Jiang Hu,Jundong Zhu,Shengzhuo Ge,Chongwen Jiang,Tianyu Guo,Tangping Peng,Tao Huang,Le Xie
Three-dimensional aerogels with hydrophobic and lipophilic properties have attracted wide attention in the effective cleaning of oil-spills. However, cost-effectiveness, biodegradability, and recycling are still challenging in the application of aerogels for oil-water separation. In this paper, we have prepared high biocompatibility, low cost, and hydrophobic composite aerogels (WCA = 148°) through directional freezing-drying technology by using chitosan (CS) as the skeleton substrate, reduced graphene oxide nanosheets (rGO) as enhancements and hydrophobic silicon particles/polydimethylsioxane (H-SiO 2 /PDMS) as the hydrophobic modifier. The composite aerogel prepared has good adsorption capacity (18–45 g/g), good chemical and thermal stability in a harsh environment. More importantly, the adsorbed organic solvents and oils adsorbed can be easily extruded from aerogels due to its excellent compressive properties. In addition, adsorption rate for pump oil and silicone oil is accelerated with the increase of temperature. The adsorption kinetics of aerogel on silicone oil and pump oil can be well fitted by pseudo-first order kinetic equation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Li Wang,Hanlun Yang,Lijuan Xu,Canwei Peng,Yonghai Song
A novel Cu–Co-zeolite imidazole framework (Cu–Co-ZIF)-derived CuCo 2 O 4 @carbon nanocomposites supported on three-dimensional porous carbon (3D-KSC) were prepared to develop molecularly imprinted electrochemical sensors for sensing dopamine (DA). Firstly, polyhedral Cu–Co-ZIF was synthesized at room temperature and uniformly arrayed on 3D-KSC, and then the CuCo 2 O 4 @carbon nanostructure was obtained by high-temperature carbonization under nitrogen atmosphere. Finally, the molecularly imprinted polymer (MIPs) DA-imprinted chitosan was covered by potentiostatic electrodeposition to obtain the MIPs/CuCo 2 O 4 @carbon/3D-KSC integrated electrode. The results showed 15 μm-sized polyhedral Cu–Co-ZIF crystals were transformed into smaller irregular porous CuCo 2 O 4 @carbon nanocomposites with rough surface by calcination . Here, the produced 5 nm-sized CuCo 2 O 4 crystals were uniformly embedded into the N-doped porous carbon frameworks. Various experimental conditions including the amount of Cu–Co-ZIF grew on 3D-KSC, calcination temperature, electrodepositing time of MIPs, the eluted time of template molecule and the pH of electrolyte were explored. The as-prepared MIPs/CuCo 2 O 4 @carbon/3D-KSC integrated electrode exhibited excellent anti-interference ability and good stability. The sensitivity for DA detection was 720.8 μA mM −1 cm −2 , the detection range was 0.51 μM–1.95 mM, and the detection limit was 0.16 μM.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 18
·48636
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IF 2.188
Liang Chen,HongYing Hao,WanTing Zhang,Ziqiang Shao
Based on the structural characteristics of chitosan (CTS) and carboxymethyl starch (CMS)， CTS–CMS composites were prepared by crosslinking. The composites had a plurality of reactive functional groups such as NH 2 , NH 3 + , COOH, and OH and are applied to the adsorption of Cu 2+ in aqueous solution. The adsorption capacity and stability in acidic solution of the composites were preferable to that of raw material. The effects of temperature, contact time, initial concentration, and pH on the adsorption of Cu 2+ were investigated. Infrared spectroscopy, scanning electron microscope–energy dispersive spectrometer, X-ray diffraction, and X-ray photoelectron spectroscopy were used to explore the adsorption mechanism. The experiment showed that chemisorption and physisorption coexisted in the adsorption process. It is promising to apply this adsorbent to remove the metal ions in wastewater. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48636.
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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
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2019
·Vol. 45
·期 1
·29-40
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IF 1.518
Liu Xiaoli,Xie Wancui,Yang Xihong,Zhan Xiaobei,Xia Wenshui
The aim of this work was to develop a novel, nontoxic, bioactive antimicrobial material based on a natural polymer, chitosan oligosaccharides (COS), a natural pyrone compound, kojic acid (KA), and piperazine. The COS-based polymer (COS-O-MB) has been synthesized by selective partial alkylation reaction to graft kojic acid, KA, and piperazine onto the COS molecular chain. Then, physicochemical properties and bioactivity of the COS-O-MBs were evaluated and it was characterized by FT-IR, NMR spectroscopy, Mw, PID, antimicrobial activity, hemolysis assay, biocompatibility, animal toxicity, and antimicrobial action mode studies. The results revealed that the alkylation reaction took place at the C-6 position of COS, and the as-prepared COS-O-MB significantly enhanced the antimicrobial activity and biocompatibility and reduced the hemolytic activity in vitro in comparison with that of the free COS and KA. Meanwhile, the antimicrobial action mode studies proved that COS-O-MB can pass through the anionic microbial membrane, destroy the cytomembrane integrity, and potentially affect protein denaturation, demonstrating that exposure to COS-O-MB results in the death of microbial cells. But importantly, COS-O-MB is not toxic to human cells. Hence, low hemolytic activity to human red blood cells, and nontoxic nature to female mice of SLAC KM strain, made this novel polymer material a promising and effective compound for food and pharmaceutical industries.
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MATERIALS RESEARCH BULLETIN
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2019
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IF 3.355
Houde She,Ziwei Zhao,Wencai Bai,Jingwei Huang,Lei Wang,Qizhao Wang
Photocatalytic CO 2 reduction is considered as a feasible approach for solving greenhouse effect and energy shortage. Promoting electron migration and inhibiting electron-hole recombination are key challenges for efficient photocatalytic CO 2 reduction. Here, we successfully synthesized Cu:TiO 2 -CS composite as photocatalyst by a facile solvothermal method to improve the high-catalytic effect on CO 2 reduction. The as-prepared composite exhibits excellent photocatalytic CO 2 reduction performance under 300 W xenon lamp irradiation, with the yields of CO and CH 4 up to 4.48 μmol/g and 5.34 μmol/g, which is 10 times higher than that of TiO 2 . This impressive amelioration can be attributed to the synergy of organic polymer (chitosan) and inorganic material (Cu:TiO 2 ). This work may provide a constructing guidance in designing the composite photocatalyst concerning CO 2 photocatalytic reduction.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2018
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IF 3.412
Lingli Deng,Maierhaba Taxipalati,Aiping Zhang,Fei Que,Hewen Wei,Fengqin Feng,Hui Zhang
In this study, chitosan/poly(ethylene oxide) (PEO)/lauric arginate (LAE) composite nanofibrous films were fabricated via electrospinning. The addition of LAE did not change the physical properties of chitosan/PEO in acetic aqueous solutions, but increased the fluorescent intensity of chitosan by electrostatic interactions, resulting in uniform and bead-free nanofibers with an average diameter of 150 nm. The Fourier transform infrared spectra and thermal analysis indicated that the LAE molecules were homogeneously dispersed within the chitosan/PEO nanofibers. The formation of electrostatic and hydrogen bonding interactions induced by the LAE addition changed the inter- and intramolecular interactions between PEO and chitosan and further affected the mobility of the polymer molecules, leading to the increased crystallinity and decreased melting point. The hydrophilicity of the nanofibrous films was significantly increased by the incorporation of LAE, as indicated by the decreasing water contact angle from 39° to 10°. Meanwhile, the chitosan/PEO/LAE nanofibrous films showed LAE concentration dependent antimicrobial activity against Escherichia coli and Staphylococcus aureus, suggesting enhanced antimicrobial activity. The fluorescent staining experiments demonstrated that the antimicrobial mechanism of the nanofibrous films was cell membrane damage.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2018
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IF 1.911
Feng Su,Yuandou Wang,Xue Liu,Xin Shen,Xingjian Zhang,Quansheng Xing,Lihong Wang,Yangsheng Chen
Carboxymethyl chitosan-graft-polylactide (CMCS-PLA) and carboxymethyl chitosan (CMCS) hydrogels were prepared by using 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride/N-hydroxysuccinimide (EDC/NHS) as crosslinking agent and catalyst at room temperature. The biocompatibility of the hydrogels was evaluated with the aim of assessing their potential as drug carrier. Various aspects of biocompatibility were considered, including MTT assay, agar diffusion test, release of lactate dehydrogenase (LDH), hemolytic test, plasma recalcification time (PRT), and dynamic clotting time. MTT assay showed that the cytotoxicity level of both hydrogels to L-929 cells was 0 or 1. The LDH release of CMCS and CMCS-PLA was 26 and 29%, respectively, which is slightly higher than that of the negative control (21%) and much lower than that of the negative control (87%). The hemolysis ratio of CMCS and CMCS-PLA was 1.4 and 1.7%, respectively, suggesting outstanding anti-hemolysis properties of both materials. The PRT value of CMCS and CMCS-PLA was higher by 77 and 99% than the value of the positive control. All the results revealed that the hydrogels present good cytocompatibility and hemocompatibility in vitro. In vivo degradation and tissue compatibility were evaluated by subcutaneous injection in the dorsal area of rats. CMCS and CMCS-PLA hydrogels were completely degraded and the inflammatory response also completely disappeared around hydrogels after 19 days in vivo. It is thus concluded that hydrogels formed of CMCS and CMCS-PLA with outstanding biocompatibility are promising as potential drug carrier.
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Journal of Cleaner Production
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2018
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IF 5.651
Shuting Zhuang,Rong Cheng,Mi Kang,Jianlong Wang
Uranium is used to make nuclear fuels for power generation . Uranium-containing wastewater is produced from fuel fabrication, fuel reprocessing , which resulted in the soil and water pollution . In this study, a cleaner and environmental friendly adsorption material, chitosan, was used to remove uranium from aqueous solution. Magnetic amidoxime functionalized chitosan beads were synthesized, characterized and applied for adsorption of uranium. The adsorption capacity of 117.65 mg/g was achieved at pH = 6, mainly due to coordination ability of amidoxime groups. With an Ms of 21.7 emu/g, the magnetic adsorbents could be fast separated from aqueous solution by the magnetic field. Additionally, the results showed that the adsorption process could be well described by the pseudo-second order kinetic (R 2 = 0.9842) and Langmuir models (R 2 = 0.9995). Finally, an adsorption mechanism was tentatively proposed to explain the adsorption process.
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