JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2018
·Vol. 26
·期 12
·4311-4320
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IF 1.971
Wu Chengyi,Zhang Xu,Li Cong,Cheng Chao,Zheng Yin
A novel sodium alginate-grafted poly(acrylic acid)/graphene oxide (NaAlg-g-PAA/GO) composite hydrogel was prepared via ultraviolet irradiation, and characterized by infrared spectroscopy spectrometer. X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. It was employed to adsorb NH 4 + from aqueous solution and used as slow-release nitrogen fertilizers (SNFs). Result indicated that the adsorption process for NH 4 + reached equilibrium within 50 min, with the adsorption capacity of 6.6 mmol g −1 even if 30 wt% GO was incorporated. The results of adsorption kinetic and isotherm were well described by the pseudo-second-order and Freundlich model. The thermodynamics analysis showed the adsorption process was spontaneous. The study indicated excellent water-holding ratio of soil with 2 wt% SNFs was 81.2%, and nitrogen release was up to 55.1% within 40 days in soil. Overall, NaAlg-g-PAA/GO could be considered as an efficient adsorbent for the recovery of nitrogen with the agronomic reuse as a fertilizer.
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高影响因子
MACROMOLECULAR RESEARCH
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2018
·Vol. 26
·期 10
·892-899
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IF 1.767
Huang Mengjia,Li Jie,Chen Jia,Zhou Mi,He Jianguo
The wound healing for tympanic membrane (TM) perforations is one of the most common clinic treatment. New designs of biomaterials, and lately tissue-engineered composites and grafts, have been applied for the management of TM perforation. In this work, a series of chitosan (CS)/polyvinyl alcohol (PVA) nanofibrous films have been fabricated as a kind of patch for repairing TM perforation. The scaffolds were crosslinked by glutaraldehyde solution to prevent them from being dissolved in the culture medium. The morphology of nanofibers from different precursors has been observed by using scanning electron microscopy (SEM). And the crosslinked films have been characterized by SEM and Fourier transform infrared spectroscopy for confirming its morphology and chemical structure. We found the films with crosslinking showed stronger tensile strength and modulus compared to the uncrosslinked one. And the mechanical properties could be tuned by the crosslinking time. In addition, after crosslinked, the films showed good thermostability and water-resistance, characterized by thermo gravimetric analyzer and contact angle meter. The cell viability studies with human umbilical vein endothelial cells, fibroblasts and mesenchymal stem cells demonstrated that the nanofibrous scaffolds formed by electrospinning process had no side effects for cell proliferation. However, a better way of crosslinking CS/PVA films needs to be further studied.
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高影响因子
FIBERS AND POLYMERS
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2018
·Vol. 19
·期 5
·1057-1063
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IF 1.353
Wang Fang,Pan Siyu,Zhang Peikun,Fan Haojun,Chen Yi,Yan Jun
A novel phosphorus-containing flame retardant plasticizer (PFRP) derived from castor oil acid methyl ester (COME) was synthesized to substitute dioctyl phthalate (DOP) for plasticizing polyvinyl chloride (PVC) products. The chemical structures of PFRP were confirmed by fourier transform infrared spectroscopy (FTIR) and 1 H nuclear magnetic resonance ( 1 H NMR). Meanwhile, the plasticizing effect, flammability and thermal stability of plasticized PVC films were investigated by dynamic mechanical analyzer (DMA), limiting oxygen index (LOI) test, scanning electron microscope (SEM) and thermogravimetric analysis (TGA). As the PFRP content increasing from 0 wt% to 50 wt% amount of plasticizers, the plasticizing efficiency and the mechanical properties showed a slightly decreasing tendency compared with that of DOP, while the LOI value of plasticized PVC increased remarkably from 21.5 % to 25.2 %, showing a combined plasticizing efficiency and flame retardancy. SEM and TGA analysis indicated that PFRP had little effect on thermal stability but was effective to promote the formation of compact carbon residue.
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CHROMATOGRAPHIA
·
2018
·Vol. 81
·期 7
·1103-1108
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IF 1.401
Li Fangfang,Bao Yan,Yu Yuexue,Cui He,Fa Yun,Liu Huizhou
A valve-switching ion chromatography method coupled with conductivity and pulsed amperometric detection has been set up for the simultaneous determination of organic acids, inorganic anions and alditols in wine. The system, based on valve-switching technique, consisted of two pumps, two analytical columns and a trap column connected in series via one six-port valve. In addition, the optimal valve-switching time and chromatographic conditions were explored to obtain a good linearity, precision, accuracy, and sensitivity with a mean correlation coefficient of > 0.99, repeatability of 0.62–6.18% for eight replicates, and the average spiked recovery of 96.66%. The new method was successfully applied in the analysis of six kinds of wine from different regions.
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高影响因子
Nature Communications
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2018
·Vol. 9
·期 1
·1-11
·
IF 12.353
Wan Fang,Zhang Linlin,Dai Xi,Wang Xinyu,Niu Zhiqiang,Chen Jun
Rechargeable aqueous zinc-ion batteries are promising energy storage devices due to their high safety and low cost. However, they remain in their infancy because of the limited choice of positive electrodes with high capacity and satisfactory cycling performance. Furthermore, their energy storage mechanisms are not well established yet. Here we report a highly reversible zinc/sodium vanadate system, where sodium vanadate hydrate nanobelts serve as positive electrode and zinc sulfate aqueous solution with sodium sulfate additive is used as electrolyte. Different from conventional energy release/storage in zinc-ion batteries with only zinc-ion insertion/extraction, zinc/sodium vanadate hydrate batteries possess a simultaneous proton, and zinc-ion insertion/extraction process that is mainly responsible for their excellent performance, such as a high reversible capacity of 380 mAh g –1 and capacity retention of 82% over 1000 cycles. Moreover, the quasi-solid-state zinc/sodium vanadate hydrate battery is also a good candidate for flexible energy storage device.
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PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2018
·Vol. 410
·期 17
·4227-4234
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IF 3.307
Liu Hongwen,Chen Yating,Song Chunli,Tian Gang,Li Shiya,Yang Guiying,Lv Changyin
Radioactive radon decays into a stable daughter product, 210 Pb, which was used as the detection target to determine the radon radiation dose in a new technique. Pb 2+ triggers DNAzyme to cleave a molecular beacon (MB), resulting in the stem–loop structure opening and forming two single DNA strands (ssDNA). The ssDNA binds to unmodified gold nanoparticles and effectively prevents their aggregation in a salt solution. The detached enzyme strands continue to complement the remaining MB to amplify the response signal. The method proposed in this study exhibited a good linear relationship for Pb 2+ and radon concentrations in the range of 6.22 × 10 2 –1.02 × 10 5 Bq h/m 3 with a detection limit of 186.48 Bq h/m 3 using an ultraviolet–visible spectrometer. In practical applications, this sensitive method can avoid radioactive damage in field testing, and the detection limit meets the national standard in China. Importantly, this simple, highly sensitive strategy uses simple equipment and has a strong anti-interference ability.
Graphical abstract
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PubMed
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 6
·3533-3544
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IF 3.809
Yang Jin,Xia Yunfei,Xu Peng,Chen Beibei
Abstract To overcome the poor mechanical properties of biomass aerogels in oil/water separations, three different freeze-casting methods were used including direct freezing, unidirectional freezing, and bidirectional freezing with sodium alginate (SA) aerogels reinforced with cellulose nanofibrils (CN). After chemical crosslinking and silane modification, compression testing revealed that the SA/CN aerogels with parallel lamellar microstructures prepared by bidirectional freezing exhibited super-elasticity with the minimal energy dissipation of ~ 0.04 in each cycle, a maximum compressive stress of 80.4 kPa, and minimal plastic deformation at ~ 4.15%. Additionally, the water and oil contact angle of the surface of the lamellar SA/CN aerogel was 148.7° and 0°, respectively. By combining the super-elasticity and hydrophobicity/superoleophilicity, the lamella SA/CN aerogels could be reused for the separation of oil/water mixture with oil absorption capacities up to 34 times its weight. Furthermore, the lamellar SA/CN aerogel could continuously separate oil/water mixtures with the assistance of a pump. Therefore, the present study offers a simple and environmentally friendly method for fabrication of super-elastic and hydrophobic/superoleophilic biomass aerogels that are applied to continuous removal of oil from water. Graphical Abstract
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 6
·3189-3196
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IF 3.809
Lv Pengfei,Zhou Huimin,Zhao Min,Li Dawei,Lu Keyu,Wang Di,Huang Jieyu,Cai Yibing,Lucia Lucian Amerigo,Wei Qufu
A simple, rapid method for developing conductive, ultrafine, and high aspect ratio silver nanowires (AgNWs) is reported. Transparent and flexible nanocomposites were fashioned from bacterial cellulose (BC) and AgNWs in a very straightforward and direct manner without the addition of materials or the need for specific facilities. The as-prepared BC/AgNWs composite thin films were able to demonstrate acceptable transparency (near 80% at 550 nm), high flexibility, good mechanical strength (18.95 MPa) and stable conductivity (7.46 Ω sq −1 ) under various bending states.
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高影响因子
IONICS
·
2018
·Vol. 24
·期 12
·4055-4061
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IF 2.347
Wu Kezhong,Zhao Jiajing,Xiong Yuanyuan,Ruan Bei,Wu Mingxing
Pt-free composite counter electrode (CE) composed of La 2 O 3 was successfully synthesized by a simple pyrolysis of Lanthanum acetate hydrate (La(CH 3 COO) 3 ·xH 2 O) in a high-temperature solid phase. Furthermore, three proportion composite catalysts of La 2 O 3 @MWCNTs based on La 2 O 3 and multiwall carbon nanotubes (MWCNTs) were prepared and characterized as Pt-free catalysts for CE in dye-sensitized solar cells (DSSCs). The morphology and structure of La 2 O 3 @MWCNT composites were determined by scanning electron microscopy and X-ray diffraction. The electrochemical performance of La 2 O 3 @MWCNT composite catalysts for CEs was determined by photocurrent-voltage measurements, cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel polarization. The experimental results showed that the power conversion efficiencies of 5.20, 5.12, and 4.70% were obtained for La 2 O 3 : MWCNTs with mass ratios of 5:1, 3:1, and 1:1 as counter electrode towards the reduction of I 3 − /I − ions respectively in the encapsulation of DSSC batteries, which were higher than that of MWCNTs (3.94%) and La 2 O 3 (0.77%) electrode under the similar conditions. The enhanced electrode performance was attributed to relatively larger surface area and higher conductivity of La 2 O 3 @MWCNT composite catalysts.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 21
·21164-21175
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IF 2.8
Kong Qiaoping,Wei Chaohai,Preis Sergei,Hu Yun,Wang Feng
The need in simultaneous removal of heavy metals and organic compounds dictates the development of synthetic adsorbents with tailor-made properties. A nitrogen (N) and sulfur (S) co-doped graphene-based aerogel (GBA) modified with 2,5-dithiobisurea was synthesized hydrothermally for simultaneous adsorption of Cd 2+ and organic dyes—safranin-O (SO), crystal violet (CV), and methylene blue (MB). 2,5-Dithiobisurea was used as nitrogen and sulfur sources to introduce N and S-containing functional group onto graphene oxide. The adsorption mechanism of GBA towards Cd 2+ and organic dyes was studied by Dumwald-Wagner models and the results showed that surface and intraparticle diffusion was the key factor in controlling the rate of adsorption. The maximum adsorption capacities of GBA towards Cd 2+ , SO, CV, and MB comprised 1.755, 0.949, 0.538, and 0.389 mmol/g in monocomponent system, respectively. Adsorption synergism was observed with respect to Cd 2+ in presence of the dyes. The performance of GBA with respect to Cd 2+ removal from binary solutions, Cd 2+ -SO, Cd 2+ -CV, and Cd 2+ -MB, was enhanced by the presence of the dyes significantly, while the adsorption capacities towards the dyes were not affected by the presence of Cd 2+ .
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PubMed
高影响因子
Nano Research
·
2018
·Vol. 11
·期 9
·4905-4913
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IF 7.994
Chen Jinxing,Wang Qingqing,Huang Liang,Zhang Hui,Rong Kai,Zhang He,Dong Shaojun
Despite the intrinsic peroxidase-like activity of Prussian blue nanoparticles (PBNPs), their enzyme-mimic mechanism has been scarcely investigated to date. Herein, we probed the catalytic site of PBNPs for the first time, by comparing their peroxidase-like activity with that of a series of Prussian blue analogs (PBAs) in which Fe atoms were replaced by Co, Ni, and Cu. The PBNPs exhibited the highest maximal reaction velocity (1.941 μM·s −1 ), which was at least 13 times higher than that of the PBAs, demonstrating that the peroxidase-like properties of PBNPs could be ascribed to the FeN x ( x = 4–6) instead of the FeC 6 units. Notably, the PBNPs/H 2 O 2 couple also showed much higher oxidizability than ·OH radicals produced from the Fenton reaction, implying that a high active Fe(IV)=O intermediate might be formed in the FeN x units. This study can thus pave the way for the wider application of PBNPs in biomimetic reactions.
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高影响因子
RARE METALS
·
2018
·Vol. 37
·期 6
·520-526
·
IF 1.5
Mushtaq Muhammad,Guo Xian-Wei,Bi Jie-Peng,Wang Zhao-Xiang,Yu Hai-Jun
The rechargeable Li–CO 2 battery has attracted much attention for energy storage because of the high energy density and efficient utilization of greenhouse gas. However, it’s still suffered by low safety issue of liquid electrolyte. Herein, a composite cathode consisting of CNTs and polymer electrolytes was fabricated by the in-situ polymerization process for the polymer electrolyte-based solid-state Li–CO 2 batteries. With the good dispersion of CNTs and polymer electrolyte, the composite cathode is covered by film-like discharge products Li 2 CO 3 . Furthermore, the Li–CO 2 battery shows high reversible capacity (~ 11,000 mAh·g −1 ), excellent cycle stability (1000 mAh·g −1 for 100 cycles) under low charge potential (< 4.5 V), and outstanding rate performances at room temperature, which are much better than those of liquid electrolyte-based battery. Therefore, the polymer electrolyte-based Li–CO 2 battery prepared by this strategy can be a promising candidate to meet the demands of high safety and high-performance energy storage devices.
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