JOURNAL OF POWER SOURCES
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2019
·
IF 7.467
Shengnan Zhang,Shan Ren,Dongmei Han,Min Xiao,Shuanjin Wang,Yuezhong Meng
The electrochemical performance of a typical carbonyl-based organic electrode material dilithium terephthalate is improved remarkably by using sodium alginate as an aqueous binder. Compared to the conventional poly (vinylidene fluoride) binder, the electrode with sodium alginate as a binder shows significant improvement in electrochemical performance. It delivers a high capacity of 200 mAh g −1 after 100 cycles at 0.1C. Even at 1C, it still remains a capacity of 130 mAh g −1 after 1000 cycles with approximately 100% Coulombic efficiency. Due to its high water solubility, dilithium terephthalate distributes uniformly and is surrounded well by electron conductive carbon in the organic electrode with sodium alginate as aqueous binder. The excellent electrochemical performances result from the faster electron transfer , less interfacial impedance and lower polarization of the organic electrode, because the carboxyl and hydroxyl rich groups of sodium alginate facilitate the ion-transporting in the electrode. This work can provide an approach to enhance the performance of not only organic dilithium terephthalate anode, but also other organic electrode materials in various battery systems.
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CHEMOSPHERE
·
2019
·
IF 5.108
Zifen Luo,Hongyi Chen,Shichuan Wu,Cao Yang,Jianhua Cheng
Aluminum-based metal-organic framework/sodium alginate-chitosan (Al-MOF/SA-CS) composite beads were synthesized and employed as an adsorbent for the removal of bisphenol A (BPA). Several methods, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), nitrogen adsorption-desorption isotherms and X-ray photoelectron spectroscopy (XPS), were used to characterize the prepared adsorbents. Results demonstrated that the introduction of CS could change the porosity of the beads and the obtained Al-MOF/SA-CS composite beads possessed higher surface area and total pore volume comparing with the beads without CS. Batch experiments were carried out to explore the adsorption performance and the results displayed that the enhanced adsorption capacity was achieved by Al-MOF/SA-CS beads compared to the Al-MOF/SA ones. It is also found from the fitting results that the adsorption process fitted well with the pseudo-second-order kinetics model and followed the Freundlich isotherm model. Importantly, the composite beads could be easily recycled and regenerated by methanol and the adsorption efficiency still maintained as high as 96% even after five cycles. Furthermore, it can be inferred from the experimental results that the π-π stacking, hydrogen bonding and cation-π interaction could be the primary adsorption mechanisms. Considering the high adsorption properties, good water stability, especially easy separation, and excellent recyclability , Al-MOF/SA-CS composite beads could be a promising adsorbent for the removal of BPA from contaminated water .
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Journal of Environmental Sciences
·
2019
·
IF 3.556
Xuejun Xiong,Hui Xu,Beiping Zhang,Xiaohui Wu,Hongyan Sun,Dongsheng Wang,Zhengyang Wang
Membrane filtration combined with pre-coagulation has advantages in advanced wastewater treatment . As a model of a microbial polysaccharide , research on the effect of sodium alginate (SA) on alum hydrolysis has been rare; therefore, it is necessary to gain insight into the interface interaction between SA molecules and Al species, and the role SA plays during floc formation. In this study, the interaction mechanism between SA and Al species has been investigated, by evaluating the effect of SA on floc characteristics and membrane fouling during coagulation–ultrafiltration with different Al species coagulants (AlCl 3 and preformed Al 13 ). Al 2p X-ray photoelectron spectroscopy (XPS) confirmed that the complexation of ligands and Al species strongly affects the reaction pathways for Al hydrolysis and the final nature of the flocs, as Al 13 can be decomposed into octahedral precipitates when SA is added. The presence of SA can affect floc properties, which have important impacts on the characteristics of the cake layer and membrane fouling. Due to the bridging ability of SA, the floc strength increased by about 50% using Al a , which was much better than preformed Al 13 , with a percentage increase of only about 6%. Moreover, the recovery factor of HA-flocs was decreased from 96% to 43% with SA addition of 0.5 mg/L. It was concluded that SA can affect the characteristics of the cake layer and membrane fouling through participating in the formation of primary flocs and altering the Al hydrolysis pathway.
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JOURNAL OF POLYMER RESEARCH
·
2018
·Vol. 25
·期 7
·1-12
·
IF 1.434
Hu Yan,Zhang Shangwen,Han Dandan,Ding Zongxian,Zeng Suying,Xiao Xincai
We prepared a hydroxypropyl methyl cellulose-sodium alginate (HPMC-SA) composite hydrogel with a membrane covering the semi-interpenetrating network based on a semi-synthetic polymer hydroxypropyl methyl cellulose (HPMC) and a natural polymer sodium alginate (SA) by Ca 2+ crosslinking and polyelectrolyte complexation with chitosan (CS) covering the hydrogel surface. The physiochemical properties of HPMC-SA hydrogels were evaluated by scanning electron microscopy, infrared spectrum, X-ray diffraction, and thermogravimetric analysis. The swelling ratio of the HPMC-SA composite hydrogel in simulated gastrointestinal fluid was measured. The drug release behavior of the HPMC-SA composite hydrogel for macro-molecular and small-molecule drugs was evaluated by using bovine serum albumin, metformin hydrochloride, and indomethacin as model drugs. The results showed that the HPMC-SA hydrogel had good water absorption and degradability, an increased swelling ratio of 55, and a prolonged time for maximum swelling degree of 50 h. Moreover, the hydrogel exhibited higher drug-loading capacity and improvements in the sustained release of bio-macromolecules, demonstrating its potential as a drug carrier for biomedical applications.
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CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Qian Zhou,Haifei Kang,Monika Bielec,Xiaopei Wu,Qiao Cheng,Wenying Wei,Honglian Dai
Hydrogels are widely used as debriding agents on account of providing a moist environment for wound healing, however the lack of mechanical strength, angiogenesis and antibacterial property limits their applications. In this study, we synthesized novel divalent ion cross-liking hydrogels (copper, zinc, strontium and calcium) and compared the mechanical performance, swelling ratio, antibacterial properties and biocompatibility in vitro and vivo . Thereinto, among the four divalent ions cross-linked hydrogels, copper ion crosslinking exhibited the maximum breaking strength, while strontium and zinc ion cross-linked hydrogels exhibited an excellent mechanical strength. In addition, the swelling ratio and pore size of no-ion cross-linked hydrogels was larger than ion cross-kinked hydrogels. In vitro , the improvements on wound healing after hydrogel application were evaluated by histological and molecular assays by detecting VEGF and TGF-β expression. In vitro and in vivo study results showed that zinc cross-kinked hydrogel had a spectrum of antibacterial activities, cell viability, mechanical strength and the ability of wound closure by promoting fibroblasts migration, vascularization, collagen deposition and the formation of granulation tissue.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Aijiao Zhou,Chang Zhu,Wangwei Chen,Jun Wan,Tao Tao,Tian C. Zhang,Pengchao Xie
Sorption is recognized as an effective method for phosphorus removal or recovery in the aqueous environment. In this study, novel poly(vinyl alcohol)/sodium alginate/lanthanum hydroxide (PVA-SA-LH) hydrogel beads with an interpenetrating network (IPN) structure were synthesized, characterized and tested for phosphorus removal/recovery in wastewater. The hydrogel beads were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive spectrometry (SEM & EDS) and X-ray photoelectron spectroscopy (XPS) before and after sorption. Results indicated the hydrogel beads had an increased phosphorus removal efficiency with an increased hydrogel beads’ dosage, reached their maximum sorption capacity for phosphorus at pH = 4, and exhibited favorable selective sorption towards phosphorus in the present of other anions. The pseudo-second-order kinetic model and Freundlich model fit the sorption process well. After five sorption-desorption runs, the sorbents’ sorption capacity for phosphorus remained above 75% of the first run. The column test indicated a possibility for practical application. Hence, the developed PVA-SA-LH hydrogel beads may be a new kind of sorbent for phosphorus removal and recovery in the future.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2018
·
IF 3.997
Peilong Ni,Hongyan Bi,Gang Zhao,Yingchao Han,M. Nirmali Wickramaratne,Honglian Dai,Xinyu Wang
The composite fiber membrane of polyvinyl alcohol (PVA)/sodium alginate (SA)/nano-hydroxyapatite (nHAP) was fabricated by electrospinning method. In order to prevent the agglomeration and precipitation of nHAP in aqueous spinning solution, nHAP was ultrasonically suspended in aqueous solution using SA (the component of composite membrane) as stabilizer. The effect of nHAP on the morphology and mechanical property of composite fiber membrane was investigated. The in vitro biological properties including hemolysis, cytotoxicity, cell adhereing and proliferation of composite fiber membrane were evaluated. Results show that SA stabilized nHAP (SA-nHAP) suspension (1.67–10.02 mg/mL) can be obtained with SA/nHAP mass ratio of 1:33.4 for preparing homogeneous spinning solution. The electrospun membranes with PVA/SA/nHAP mass ratio of 9.33:(0.67–0.69):(0–0.668) show good fiber morphology, homogeneous incorporation and distribution of nHAP in fibers, and the content of SA-nHAP (6.25 wt%) in membrane is significantly increased compared to that of untreated nHAP (3.23 wt%). The incorporation of SA-nHAP of 1.64 wt.% significantly improves the tensile strength of PVA/SA/nHAP fiber membrane with about 45% enhancement. The hemolysis and cytotoxicity tests show that the composite fiber membrane has good biocompatibility. Moreover, cells can be seeded and proliferate well on composite fiber membrane. Therefore, the obtained PVA/SA/nHAP composite fiber membrane has the potential use as a tissue regeneration material.
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CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Qian Wang,Junping Ju,Yeqiang Tan,Longyun Hao,Yunliang Ma,Yang Wu,Huawei Zhang,Yanzhi Xia,Kunyan Sui
Herein, the three kinds of water-insoluble alginate-based nanofiber membranes were prepared by electrospinning and followed with crosslinking by calcium chloride (CaCl 2 ), glutaraldehyde vapor (GA), and trifluoroacetic acid (TFA) crosslinking, respectively. All the sodium alginate(SA) nanofiber membranes present excellent integrated adsorption performance toward methylene blue (MB). Among these, CaCl 2 crosslinked SA membranes exhibit the maximum actual adsorption capacity of 2230 mg/g and shortest adsorption equilibrium time of 50 min to date. On the basis of the selective adsorption of SA, the nanofiber membranes can separate MB/ methyl orange (MO) mixture solution and maintain high separation efficiency even after five cycles. In addition, respective applicable condition for differentially crosslinked SA nanofiber membranes was evaluated. The TFA crosslinked membranes have the least reduction in the adsorption capacity in acidic environment and GA crosslinked membranes adsorb better in alkaline environment. For seawater environment, GA crosslinked membranes show obvious adsorption performance than other crosslinked membranes.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2015
·Vol. 162
·期 7
·H486
·
IF 3.266
Liping Bao,Jiangying Dai,Lin Yang,Jianfeng Ma,Yongxin Tao,Linhong Deng,Yong Kong
Enantiorecognition of tyrosine (Tyr) enantiomers is realized via chiral ligand exchange technology combined with electrochemistry. A natural polymer, sodium alginate (SA), is electrodeposited on a glassy carbon electrode (GCE) and adopted as the chiral selector to form a diastereoisomeric ternary complex of [(SA)Zn(II)(L-Tyr)] or [(SA)Zn(II)(D-Tyr)] in the presence of Zn(II). Due to the difference in steric hindrance during the formation of these two complexes, the chiral selector preferentially recognizes D-Tyr. The electrochemical enantiorecognition of Tyr enantiomers is characterized by cyclic voltammetry and electrochemical impedance spectroscopy (EIS), and the parameters affecting the recognition efficiency are also investigated.
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Journal of Materials Chemistry B
·
2013
·Vol. 1
·期 43
·5933-5941
·
IF 0
Hua Guo,Chengling Yang,Zhenpeng Hu,Wei Wang,Yukun Wu,Quanyong Lai,Zhi Yuan
The high viscosity of sodium alginate (ALG) causes its insufficient drug loading and limits its application as a drug carrier. In the present work, we synthesized poly(ethylene glycol) oligomer (mOEG)-modified sodium alginate (ALG–mOEG) and characterized its properties as a drug delivery system. Our results showed that ALG–mOEG displayed a greatly reduced viscosity (0.024 Pa s at 2.0 wt%) with a significantly improved drug loading capacity (18.0% (w/w)) compared with unmodified ALG (6.9% (w/w)). In addition, DOX–ALG–mOEG nanoparticles (DOX–ALG–mOEG NPs) with high drug loading were more cytotoxic for HepG2 cells in vitro and showed a higher antitumor activity in vivo compared with the control group (DOX–ALG NPs) at the same dose of DOX. DOX–ALG–mOEG NPs inhibited HepG2 proliferation in vitro with an IC50 value of 220.0 ng mL−1 and reduced tumor growth in vivo by 75.6%, while DOX–ALG NPs showed activities of 443.9 ng mL−1 and 62.7%, respectively. Meanwhile, we did not observe the “accelerated blood clearance (ABC)” phenomenon in these mOEG-modified ALG nanoparticles. In view of most biologic and chemical molecules used for the biological function being hydrophobic, we thought the ALG–mOEG scaffold also might serve as an efficient long-duration carrier for other hydrophobic molecules with minimal immunogenicity.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2013
·
IF 2.906
Kai Liu,Xinxing Lin,Lihui Chen,Liulian Huang,Shilin Cao,Huangwei Wang
The nonantibacterial and low strength properties of sodium alginate films negatively impact their application for food packaging. In order to improve these properties, a novel chitosan–benzalkonium chloride (C–BC) complex was prepared by ionic gelation using tripolyphosphate (TPP) as a coagulant, and a biocomposite obtained through the adsorption of C–BC complex on microfibrillated cellulose, MFC/C–BC, was then incorporated into a sodium alginate film. The TEM image showed that the C–BC nanoparticles were spherical in shape with a diameter of about 30 nm, and the adsorption equilibrium time of these nanoparticles on the surface of MFC was estimated to be 6 min under the driving forces of hydrogen bonds and electrostatic interactions. According to the disc diffusion method, the MFC/C–BC biocomposite-incorporated sodium alginate film exhibited remarkable antibacterial activity against Staphylococcus aureus and certain antibacterial activity against Escherichia coli. The strength tests indicated that the tensile strength of the composite sodium alginate film increased about 225% when the loading of MFC/C–BC biocomposite was 10 wt %. These results suggested that the MFC/C–BC biocomposite-incorporated sodium alginate film with excellent antibacterial and strength properties would be a promising material for food packaging, and the MFC/C–BC may also be a potential multifunctional biocomposite for other biodegradable materials.
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JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Jun Wu,Xian-Bin Wang,Raymond J. Zeng
The widespread distribution of chromium(VI) in the environment leads to groundwater contamination. The use of iron sulfide (FeS) to remove Cr(VI) has therefore been proposed. However, aggregation is one of the main problems associated with the use of FeS nanoparticles prepared by traditional methods In this study, we used sodium alginate (SA) to stabilize FeS nanoparticles (FeS-SA). SA could prevent aggregation of FeS by the concurrent electrostatic repulsion and steric hindrance. Homogeneously dispersed FeS-SA nanoparticles 100 nm in diameter were observed. FeS-SA showed high efficiency in Cr(VI) removal, corresponding to an enhancement of efficiency from 65% (7.50 mmol Cr(VI) per g FeS) to 100% (11.54 mmol Cr per g FeS) relative to that achieved with naked FeS. Analysis of reaction products by X-ray diffraction and X-ray photoelectron spectroscopy revealed the co-existence of α-FeOOH, S 8 , and Cr(OH) 3 that apparently were introduced by Fe(II), S(−II), and Cr(VI), respectively. In-depth analysis of the removal mechanism revealed that reduction and adsorption respectively account for 82% and 18% of the Cr removal. In addition, higher pH and CaCl 2 concentration resulted in lower removal efficiency. This study provides a promising application of SA in enhancing FeS reactivity for the remediation of groundwater pollution.
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