BIOLOGICAL TRACE ELEMENT RESEARCH
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2017
·Vol. 184
·期 1
·60-74
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IF 2.399
Tao Ran,Wang Chengzhang,Zhang Changwei,Li WenJun,Zhou Hao,Chen Hongxia,Ye Jianzhong
The structure and bioactivity of Ginkgo biloba leaves polyprenol (GBP) are similar to that of dolichol which widely exists in human and mammalian organs. GBP possesses potential pharmacological activities against cancer. This study involved oil-in-water type nanoemulsion (NE) loading GBP was prepared by dissolving polyprenol in nanoemulsion of sodium tripolyphosphate (TPP)/TiO 2 solution, Triton X-100, and 1-octanol by inversed-phase emulsification (EIP) and ultrasonic emulsification (UE) method. Folic acid (FA)-coupled chitosan (CS) nanoparticles (NPs), GBP-FA-CS-NPs and GBP-TiO 2 -FA-CS-NPs, were fabricated by ionic cross-linking of positively charged FA-CS conjugates and negatively charged nanoemulsion with TPP/TiO 2 . And characterizations of them were investigated by TEM, SEM, FTIR, particle size, and zeta potential. The cytotoxic and genotoxic effects of GBP-TiO 2 -FA-CS-NP treatment were higher than GBP-NE, GBP-FA-CS-NPs, TiO 2 -NE, GBP-TiO 2 -NE, TiO 2 -FA-CS-NPs, and GBP-TiO 2 -FA-CS-NP treatment at the same tested concentrations in HepG2 cells. GBP-TiO 2 -FA-CS-NPs at low TiO 2 concentration (from 1 to 2.5 μg/ml) showed good inhibition capacity on HepG2 cells and low cytotoxic and genotoxic effects on HL-7702 cells. The possible mechanism of cytotoxicity on GBP-TiO 2 -FA-CS-NPs against HepG2 cells is by preventing excessive intracellular Ca 2+ into extracellular spaces via inhibiting Ca 2+ -ATPase and Ca 2+ /Mg 2+ -ATPase.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Jia Yao,Tao Mei,Zhenqi Cui,Zhanghao Yu,Kang Xu,Xianbao Wang
HC-TiO 2 /S composite (Hollow carbon spheres with TiO 2 in or out the carbon spheres encapsulates sulfur and polysulfides) is successfully prepared in our study. The hollow carbon spheres own good electrical conductivity and hollow volume, which can remedy the defect of nonconductive sulfur species and restrain the volumetric expansion of sulfur, respectively. And the TiO 2 has strong interaction with sulfur species and polysulfides, which can suppress the diffusion of polysulfide intermediates. TGA indicates that the HC-TiO 2 can be loaded with 67 wt% sulfur. Based on the synergistic effect of hollow carbon spheres and nano TiO 2 , the HC-TiO 2 /S cathode can deliver a discharge specific capacity of 671 mAh/g at 1 C (1 C = 1672 mA/g) after 300 cycles, together with the capacity retention of 93%.
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COMPOSITES COMMUNICATIONS
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2017
·
IF 0
Ying Bai,Xue Mao,Jun Song,Xia Yin,Jianyong Yu,Bin Ding
Study of high-efficiency and free secondary pollution TiO 2 based photocatalyst has become the one of the most urgent problems in improving the decolorization effect of the waste water from printing and dyeing mill. In this work, a novel self-standing Ag 2 O@YSZ-TiO 2 p-n nanoheterojunction nanofibrous membrane was designed for ultraviolet (UV) photocatalyst by a facile combination of electrospinning technique and precipitation process. Moreover, the UV photocatalytic performance of the flexible AZT p-n nanoheterojuction nanofibrous membranes with a band gap energy of 2.89 eV and good reversibility of 5 cycles, was superior to the commercial catalyst P25 for photocatalytic degradation of methylene blue. Furthermore, the photocatalytic mechanism of the flexible Ag 2 O@YSZ-TiO 2 nanofibrous photocatalyst was proposed by the electron transition in Ag 2 O/TiO 2 p-n nanoheterojunction, which showed a new insight to development of flexible and high-efficiency nanoheterojunction nanocrystalline photocatalytic membranes.
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ACS Applied Materials & Interfaces
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2017
·
IF 7.504
Lei Jiang,Lei Sun,Dong Yang,Jian Zhang,Ya-Juan Li,Kun Zou,Wei-Qiao Deng
TiO2 nanocrystals with different reactive facets have attracted extensive interest since they were first synthesized. The anatase TiO2 nanocrystals with (001) or (100) dominate facets were considered to be excellent electrode materials to enhance the cell performance of dye-sensitized solar cells. However, which reactive facet presents the best surface for benefiting photovoltaic effect is still unknown. We report a systematic study of various anatase TiO2 surfaces interacting with N719 dye by means of density functional theory calculations in combination with microscopic techniques. The (001) surface interacting with N719 would have the lowest work function, leading to the best photovoltaic performances. To further increase the efficiency, Nb dopant was incorporated into the anatase TiO2 nanocrystals. Based on the theoretical prediction, we proposed and demonstrated novel Nb-doped (001)-dominated anatase TiO2 nanosheets as photoelectrode in a dye-sensitized solar cell to further enhance the open-circuit voltage. And a power conversion efficiency of 10% was achieved, which was 22% higher than that of the undoped device (P25 as an electrode).
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PubMed
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CONSTRUCTION AND BUILDING MATERIALS
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2016
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IF 2.421
Peng Fei,Hanguo Xiong,Jie Cai,Chao Liu,Zia-ud-Din,Yan Yu
This paper analyzes the impact of rutile nano-titanium dioxide (nano-TiO 2 ) on the weatherability of bamboo fiber/high-density polyethylene (HDPE) composites using xenon-arc weathering accelerated tests. The results showed that a series of performance reduction containing color fading, surface cracking, structural transformations and loss of mechanical properties appeared on the composites during the accelerated weathering process. These attributes could be minimized to a greater extent using rutile nano-TiO 2 . The analysis revealed that, although free-radicals created by nano-TiO 2 after absorbed UV light may resulted in the oxidization of bamboo fiber and HDPE , rutile nano-TiO 2 mainly acted as light screening agent and ultraviolet absorbent, which retarded the photo-oxidative of the composites. Moreover, rutile nano-TiO 2 enhanced the thermal stability by interacting with the molecular chain of bamboo fiber and HDPE which resulted into reduced thermo-oxidative aging of composites.
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JOURNAL OF ELECTROCERAMICS
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2017
·Vol. 40
·期 1
·65-71
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IF 1.238
Huang Qiao,Luo Hang,Chen Chao,Zhou Kechao,Zhang Dou
Dielectric composites are of great demand in the micro-electronics industry. To enhance the energy storage density of the composites, TiO 2 nanowire clusters was synthesized by a hydrothermal method and incorporated into the P(VDF-HFP) polymer matrix in this work. The microstructure, dielectric properties of the prepared film were discussed and the effects of TiO 2 loading on the energy density were investigated. The results shows that the TiO 2 clusters were tightly blended to the P(VDF-HFP) matrix owing to the dopamine-modified interface. The dielectric constant increased with the loading of TiO 2 , the maximum dielectric constant reached 12.04 with 7.5 vol% TiO 2 loading at 1 kHz, as compared to 5.01 for the neat P(VDF-HFP). The enhanced dielectric constant was attributed to the interface polarization originated from the large interface area between the TiO 2 nanowire and polymer matrix. The discharged energy density of the composite significantly increased to 1.35 J/cm 3 with 7.5 vol% TiO 2 nanowire clusters, which was two times higher than that of the neat P(VDF-HFP) at the same condition. The findings of this work can shed a light on improving the energy density of energy storage device via morphology modification.
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Catalysis Science & Technology
·
2016
·Vol. 6
·期 14
·5543-5553
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IF 5.287
Xin Zhao,Lei Huang,Supawadee Namuangruk,Hang Hu,Xiaonan Hu,Liyi Shi,Dengsong Zhang
A novel Zr–CeVO4/TiO2 catalyst was developed for the selective catalytic reduction (SCR) of NO with NH3. Both TiO2 nanosheets (TiO2-NS) and nanoparticles (TiO2-NP) with different crystal facets were used as supports for the catalyst. It was found that the TiO2-NS-supported catalyst showed much better activity, stability and H2O/SO2 durability than the TiO2-NP-supported catalyst. In particular, the catalyst loading amount was much lower than those of previously reported vanadate-based SCR catalysts. The crystal structures and morphologies were analysed by X-ray diffraction (XRD), Raman spectroscopy and (high-resolution) transmission electron microscopy ((HR)TEM). The redox properties, surface active species and acid sites of the catalysts were investigated through hydrogen temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), ammonia and nitrogen oxide temperature-programmed desorption (NH3-TPD and NOx-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTs) experiments. The improved activity at lower temperature was due to the presence of more active oxygen species and Brønsted acid sites, as well as the formation of NO2 on the surface of the TiO2 nanosheets which have exposed (001) facets. The enhanced stability and H2O/SO2 durability of Zr–CeVO4/TiO2-NS was due to the limited formation of NH4NO3 and (NH4)2SO4/NH4HSO4. The excellent low operation temperature, low vanadium content and absence of WO3(MoO3) in this catalyst indicated that it has promising potential as a SCR catalyst for practical applications.
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MATERIALS & DESIGN
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2016
·
IF 3.997
Yawen Wang,Zunli Mo,Ping Zhang,Chun Zhang,Lijuan Han,Ruibin Guo,Hao Gou,Xiaojiao Wei,Rere Hu
A surfactant-assisted hydrothermal route was developed for the synthesis of three-dimensional (3D) flower-like TiO 2 microsphere decorated graphene composite (FT/GN) based on the hydrothermal reduction of graphene oxide and formation of TiO 2 microsphere in the presence of poly(vinyl pyrrolidone) (PVP). By several characterization methods such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy, we demonstrated that uniform flower-like TiO 2 (FT) microsphere with average diameter of 1.4 μm have successfully anchored on the surface of graphene sheets . Effects of PVP and reaction temperature on the microstructure of the composite were investigated. Benefits from the combined graphene with FT microsphere were that the FT/GN composite exhibited higher adsorption capacity and photocatalytic activity for the removal of rhodamin B (RhB) than blank FT microsphere and P25. Especially, the removal rate of RhB using FT/8GN composite under UV light irradiation reached 99.2% in 80 min, with corresponding TOC removal efficiency of 66.49%. Moreover, the recycled photoactivity tests showed that the prepared composite were stable enough and maintained high removal efficiency for RhB even after four cycles. It is expected that the present synthetic strategy may provide a new strategy for the fabrication of various GN-based hybrids with multi-dimensional structure.
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ELECTROCHIMICA ACTA
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2016
·
IF 4.803
Yongbo Chen,Zhijie Bi,Xiaomin Li,Xiaoke Xu,Shude Zhang,Xuemei Hu
In this paper, we report an electrochromic device (ECD) using novel porous TiO 2 @prussian blue core-shell nanostructures as electrodes. The core-shell nanostructures were formed by coating prussion blue (PB) on TiO 2 nanorod templates through two-step soft chemical methods. The surface area of PB is remarkably enlarged and the diffusion length of ions is notably shortened due to the distinct porous morphology of the nanostructures, resulting in highly increased storage capacity of K + ions in electrochromic process. Compared with the ECD based on dense PB film, higher optical contrast (48%) and faster response speed (t c = 6.2 s, t b = 2.2 s) are realized in the TiO 2 @PB core-shell structures. In particular, the coloration efficiency of the ECD based on the core-shell nanostructures is significantly improved to 131.5 cm 2 C −1 at 700 nm. Moreover, a model of insertion/extraction of K + ions was proposed to interpret the enhanced electrochromic performance of core-shell nanostructures.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
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IF 4.758
Shan Tang,Qun Zhao,Yifeng Tu
This paper describes a novel approach to promote the analytical performance of electrochemiluminescent (ECL) biosensor of cholesterol by a nanocomposite (Au nanoparticles/ion liquid/hollowed TiO 2 nano-shell) pre-functionalized indium tin oxide glass to load the cholesterol oxidase. Here the enzymatically produced hydrogen peroxide greatly intensified the ECL of luminol under the catalysis of the nanocomposite. The quantification of cholesterol was directly accomplished by calibrating the ECL sensing output. The formation and properties of the nanocomposite and the functionalized electrode have been confirmed by electrochemistry , spectroscopy and electron-microscopy. The prepared biosensor exhibits a linear regression ranged from 8.33 × 10 −9 M to 4.17 × 10 −7 M with an ultralow detection limit (LOD) of 6.30 × 10 −9 M. It also possesses the excellent specificity for cholesterol from potential interferents , the favorable repeatability/stability for use or storage, the good reproducibility and adequate recovery for real sample test. In addition, for the detection of clinical serum sample, it is well consistent with the datum from medical cholesterol kit, indicating its reliability. It is in promising of the application for the cholesterol detection in those clinical specimens of teeny amount of sample and limited concentration.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Zhan Wang,Xianjun Lang
Herein, we report an efficient protocol for the selective oxidation of amines with the sole involvement of conduction band electrons (e cb − ) of TiO 2 for both the activation of O 2 and the ensuing oxidation reaction. Visible light was harvested by dye molecules on the surface of TiO 2 , which injects electrons into its conduction band, generating dye radical cations. Charge transfers from dye radical cations to amines are relayed by the catalytic cycle of (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) to TEMPO + , which is an oxidant that can conduct the direct two-electron oxidation of amines to imines. TEMPO was regenerated by the oxidation of TEMPOH with superoxide generated by the interaction of e cb − and O 2 . This work suggests that one can exploit the strategy of cooperative photocatalysis with each component performing in its optimal role: TiO 2 for O 2 activation, dye for visible light harvesting, and TEMPO for oxidative transformations.
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Particuology
·
2017
·
IF 2.621
Chun Shen,Kexia Pang,Le Du,Guangsheng Luo
A facile and green method to prepare Ce-doped TiO 2 nanoparticles supported on porous glass beads is reported. An ion exchange process and subsequent calcination yielded Ce-doped TiO 2 nanoparticles with a mean size of 4.8 ± 0.3 nm. The nanoparticles were dispersed on the surface of porous glass beads. The addition of Ce enhanced the visible light absorption of the TiO 2 nanoparticles in the 400–500 nm spectral window. The band gap of the as-prepared catalyst was 2.80 eV. The Ce-doped TiO 2 nanoparticles immobilized on porous glass beads exhibited excellent photocatalytic activity for the visible-light-degradation of methyl orange (MO) and rhodamine B (RhB); with rate constants of 0.095 and 0.230 min −1 ; respectively. The effects of Ce dosage; reaction duration; and initial solution pH on the conversion of MO and RhB dyes were investigated. The green synthesis and favorable photocatalytic activity makes the Ce-doped TiO 2 nanoparticles immobilized on porous glass an attractive alternative for the efficient degradation of organic pollutants.
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