Advanced Energy Materials
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2017
·Vol. 7
·期 15
·1700034
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IF 16.721
Leyuan Zhang,Liang Chen,Hao Luo,Xufeng Zhou,Zhaoping Liu
To develop high-power and high-energy batteries with a long life remains a great challenge, even combining the benefits of metal (fast kinetics and high capacity) and carbon materials (robust structure). Among them, Al-ion batteries based on aluminum anode and graphite carbon cathode have gained lots of interests as one of the most promising technologies. Here, it is demonstrated that the size of graphitic material in ab plane and c direction plays an important role in anion intercalation chemistry. Sharply decreasing the size of vertical dimension ( c direction) strongly facilitates the kinetics and charge transfer of anions (de)intercalation. On the other hand, increasing the size of horizontal dimension ( ab plane) contributes to improving the flexibility of graphitic materials, which results in raising the cycling stability. Meanwhile, chloroaluminate anions are reversibly intercalated into the interlayer of graphite materials, leading to the staging behaviors. In the end, an ultrafast Al-ion battery with exceptional long life is achieved based on large-sized few-layer graphene as a cathode and aluminum metal as an anode.
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BIOTECHNOLOGY & BIOTECHNOLOGICAL EQUIPMENT
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2017
·
IF 1.059
Sheng Hu,Xiang Zhang,Yi Lu,Yue-Cheng Lin,Dong-Fang Xie,Hui Fang,Jun Huang,Le-He Mei
An aspartate aminotransferase (AATase) gene from Lactobacillus brevis CGMCC 1306 was cloned, which contains a 1182-bp open reading frame coding for 393 amino acids (41.43 kDa). When expressed in Escherichia coli BL21 (DE3), the recombinant AATase was purified and subsequently characterized. The recombinant AATase can catalyse the conversion of L-Asp to L-Glu, and the kcat/Km was determined to be 25.5 (mmol/L)−1 s−1 for L-Asp and 207.8 m(mol/L)−1 s−1 for α-ketoglutarate. With optimum temperature as 25 ˚C, the AATase may be a novel and special psychrophilic enzyme which exhibited a good thermal stability below 55 ˚C. The conserved active site residue of AATase was identified as Lys237 by phylogenetic analysis. Secondary structure of the enzyme includes α-helix (39.2%), β-sheet (5.5%), β-turn (8.8%), and random coil (36.5%) by circular dichroism spectral analysis. Phase diagram for the fluorescence data analysis showed that guanidinium chloride-induced unfolding of AATase involved at least one intermediate.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiaoyan He,Caiyun Zhang,Meng Wang,Yunlei Zhang,Liqin Liu,Wu Yang
Conductive hydrogels are a class of composite materials that usually comprise hydrated polymers and conductive materials. Practical application requires the conductive hydrogels to have various properties such as high conductivity, toughness, self-healing, facile processing ability, and so on. Although challenging to have all the above-mentioned properties, a composite material composed of polymer hydrogel with embedded Au nanoparticles (i.e., P(NaSS)/P(VBIm-Cl)/PVA@Au) was found to show the comprehensive properties above in this paper. For example, P(NaSS)/P(VBIm-Cl)/PVA@Au exhibits mechanical and electrical self-healing properties at ambient conditions. In addition, P(NaSS)/P(VBIm-Cl)/PVA@Au is tough and thermoplastic, potentially making it useful for a variety of applications.
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Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-8
·
IF 2.833
Zheng H. W.,Liang X.,Yu Y. H.,Wang K.,Zhang X. A.,Men B. Q.,Diao C. L.,Peng C. X.,Yue G. T.
The present study reports Bi 5 FeTi 3 O 15 (BFTO) nanofibers/graphene (Gr) nanocomposites (BGr) as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). BFTO nanofibers with diameters of 40–100 nm were fabricated by sol-gel based electrospinning technique. The microstructure and surface morphology of the BFTO nanofibers and the BGr nanocomposites were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The electrochemical performances of BGr CEs were comprehensively characterized and investigated. Compared to pristine BFTO, the nanocomposites have a marked improvement in electrocatalytic performance for the reduction of triiodide because of larger surface area and lower transfer resistance on the electrolyte-electrode interface. The maximum power conversion efficiency has reached 9.56%, which is much larger than that of pure BFTO CEs (0.22%).
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MACROMOLECULES
·
2016
·
IF 5.554
Zhukang Du,Biye Ren,Xueyi Chang,Renfeng Dong,Jun Peng,Zhen Tong
Hydrophobically modified ethoxylated urethanes (HEURs) belong to an important class of telechelic associative polymers for improving solution rheological properties. We designed and prepared a novel azobenzene end-functionalized HEUR polymer (AzoHEUR), which was used to investigate the effects of hydrophobicity change of end hydrophobes induced by photoisomerization of azobenzene on the solution aggregation and rheological properties. The concentrated AzoHEUR solutions show a reversible rheological property change upon alternative exposure to UV and visible light. We have demonstrated that a reversible change in hydrophilic–lipophilic balance of polymer followed by photoisomerization of azobenzene induces a reversible rearrangement of micellar junctions through loop–bridge or bridge–loop transitions, which reversibly changes not only the network connectivity but also the solution relaxation behavior. Moreover, a structural model is proposed to describe the rearrangement of micellar junctions induced by photoisomerization of azobenzene. The work will not only provide new insights into the effect of hydrophobicity change of stimuli-responsive end groups on the aggregation and rheological behavior of HEUR aqueous solutions but also open a new perspective for development of some special applications of HEURs in fabrication and transmission of soft materials, medicines, cosmetics, inks for inkjet printers, and flow rate controlling systems.
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Journal of Cleaner Production
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2017
·
IF 5.715
Bo Niu,Zhenyang Chen,Zhenming Xu
Waste printed circuit boards (WPCBs) are valuable urban ore for recycling. Many efforts have been done to recover resources from basal boards of WPCB. In addition to basal boards, WPCBs contain many electronic components. However, the recycling technology for electronic components has been poorly developed. This study proposed an integrated and environment-friendly technology for recycling waste tantalum capacitors (WTCs) of WPCBs. Firstly, the WTCs were treated by argon pyrolysis to decompose mold resin. The pyrolysis temperature of 550 °C and holding time for 30 min were considered as the optimal parameters. Then, the pyrolysis residues were performed by crush and magnetic separation to recover nickel-iron terminals. Finally, chloride metallurgy (CM) was used to recover rare metal tantalum (Ta). The Ta recovery rate could reach 92.87 ± 0.36%. The optimal parameters were determined as temperature of 493 °C, adding FeCl 2 ·4H 2 O of 53 wt% and holding time for 150 min based on the response surface methodology (RSM). This study exploits an efficient approach for recycling WTCs and provides a reference for future industrial application.
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DYES AND PIGMENTS
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2017
·
IF 3.473
Yanhua Lai,Ping Zhao,Zhan Zhang,Bai Li,Junchen Wu
The self-assembled peptide cargo carrier with the ability of probe offered an effective strategy to deliver and track the anticancer drug, cisplatin (DDP) in ovarian cancer cells. This simple peptide system containing a pyrene fluorogen and arginine-glycine-aspartic acid (RGD) sequence could be utilized to release DDP in situ by the specific recognition between an RGD motif and α v β 3 integrin that was over-expressed on ovarian cancer cells. Importantly, we found that the disassembly-triggered peptide nanofibers , PA1, could effectively combine with DDP and release DDP in the cytoplasm with the pyrene fluorescence restoring. Moreover, the peptide cargo carrier efficiently penetrated tumour cells for enhancing therapeutic efficacy. Our system could open the door for the delivery of anticancer drug in cancer-related therapy.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Xi Zhang,Yan Lv,Hao-Cheng Yang,Yong Du,Zhi-Kang Xu
Thin-film composite (TFC) nanofiltration membranes are prepared via interfacial polymerization with a polyphenol coating as an interlayer for the thin and smooth polyamide selective layer. The polyphenol interlayer is simply fabricated by the codeposition of tannic acid and diethylenetriamine without changing the surface morphology of the polysulfone ultrafiltration substrate. An interfacial polymerization is conducted from piperazidine and trimesoyl chloride on the polyphenol interlayer to construct the polyamide selective layer. The as-prepared TFC nanofiltration membranes show nearly tripled fold of water permeation flux as compared with those prepared at the same condition without an interlayer. They also exhibit a high rejection to Na2SO4 (>98%) because the thin and defect-free polyamide selective layer is formed on the polyphenol interlayer. These nanofiltration properties have high reproducibility, which means the TFC nanofiltration membranes are suitable for scale-up industrial applications.
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Nano Energy
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2016
·
IF 11.553
Jun Jiang,Shu Lu,Han Gao,Xing Zhang,Han-Qing Yu
High-performance and cost-effective electrocatalysts are essential for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Herein, we provide the first report about a facile colloidal method to fabricate 2D ultrathin ternary FeNiS 2 nanosheets (NSs). When serving as an OER catalyst under alkaline conditions, they exhibited superior electrocatalytic performance over RuO 2 and achieved a current density of 10 mA cm −2 with a potential of 1.54 V and a Tafel slope of 46 mV decade − 1 . Meanwhile, an ORR catalytic activity was also achieved with an onset potential of 0.78 V, a Tafel slope of 107 mV decade − 1 , and a high selectivity with electron transfer number of 3.92 and H 2 O 2 % of 3.6% at 0.3 V under neutral conditions, which were comparable to those of the commercial Pt/C. The ternary FeNiS 2 -NSs were superior over the binary FeS NSs and Ni 9 S 8 nanorods synthesized via the same routes. More importantly, with the resistance for the corrosion and poison from the alkaline and phosphate buffer solution , the FeNiS 2 NSs exhibited superior stability without apparent OER or ORR catalytic activity loss over long-term operation. Their enhanced electrocatalytic performance compared to their binary counterparts indicate that a new strategy to prepare high performance OER and ORR catalysts was developed. In addition, the as-prepared FeNiS 2 NSs could serve as a noble-metal-free catalyst for OER or ORR with good electrocatalytic activities and long-term stability for practical applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Sha-Sha Yi,Jun-Min Yan,Ba-Ri Wulan,Si-Jia Li,Kai-Hua Liu,Qing Jiang
Photocatalytic hydrogen generation from water is an important solar-to-chemical conversion process, and is also a sustainable and environment-friendly generation approach for energy source of hydrogen. Herein, for the first time, we report the noble-metal-free CoP/g-C 3 N 4 hybrid as a photocatalyst for the highly efficient hydrogen generation by water splitting under visible light irradiation, whose hydrogen generation rate is ∼131 times higher than that of pure g-C 3 N 4 , and is even better than that of Pt/g-C 3 N 4 . Based on the detailed analyses of photoluminescence (PL) spectra, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), photocurrent-time ( i-t ) curves, and electrochemical impedance spectroscopy (EIS) Nyquist plots, the reason for the high efficiency of CoP/g-C 3 N 4 is found to be its good absorption ability of visible light, highly effective separation and low recombination rate of photo-generated electron-hole pairs due to the addition of CoP to g-C 3 N 4 .
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CHEMOSPHERE
·
2016
·
IF 3.698
Yaolan Niu,Diwen Ying,Kan Li,Yalin Wang,Jinping Jia
Functional PET fiber (PET–AA–CS) was prepared by oxygen–plasma pretreatment and grafting of acrylic acid (AA) and low–molecular–weight chitosan (LMCS) on the polyethylene glycol terephthalate (PET) substrate. This adsorbent was targeted for quick removal of metal ion in river pollutions with an easy recycling of the fiber after emergency processing. The fabricated PET–AA–CS was characterized by the scanning electron microscope (SEM), contact angle, fourier transform infrared (FTIR) spectra and X–ray photoelectron spectroscopy (XPS) to look into its morphology, surface functional groups, and adsorption mechanism of copper ions from the aqueous solution. The overall adsorption process of copper ions on the PET–AA–CS was pH–dependent with an optimal pH value of 5.0, at which a maximum capacity of 68.97 mg g −1 was obtained. The result of fitting also shows that adsorption process follows the Langmuir isotherm and pseudo–second–order model. Moreover, the material shows good stability during 5 cycles of adsorption and desorption, and also shows no significant effect of co–existing ions including Ca 2+ , Mg 2+ , K + , Cl − , and et al. In general, PET–AA–CS developed in this study shows significant benefit of eco–friend and cost-efficiency for fast removal of copper ions in potential river metal pollutions comparing with traditional adsorbents.
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JOURNAL OF MOLECULAR LIQUIDS
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2016
·
IF 2.74
Yajun Chen,Fenghe Wang,Lunchao Duan,Hao Yang,Jay Gao
As an agricultural waste, rice husk ash (RHA) has the potential to be a viable alternative adsorbent for the removal of tetracycline (TC) from aqueous solution. This study aims to explore its feasibility of RHA as a new adsorbent, and understand its adsorption mechanism for TC. Also assessed in this study are the influences of initial concentration of TC, adsorption time, solution pH and temperature on RHA adsorption performance. It is found that TC removal efficiency of RHA is related to the initial concentration of TC solution. TC concentration decreases sharply within the first 60 min in its adsorption process, and then only gradually, reaching the equilibrium within 600 min. RHA adsorption capacity is related to solution pH, temperature, and ion intensity, especially at a high pH value. A rise of 313 K in temperature caused the adsorption capacity to more than double. Furthermore, low-acid and high-alkaline solution can accelerate the adsorption of TC onto RHA. The highest adsorption capacity of 8.37 mg/g achieved in this study is much higher than other adsorbates reported in the literature, indicating the feasibility of RHA as a new adsorbent. The Langmuir isotherm model is the most reasonable in depicting the adsorption behavior . The pseudo second order model fits the experimental data nicely, suggesting a mostly physical and chemical control over the adsorption. Such findings can serve as a useful guide in expanding the applicability of RHA to new areas.
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