Journal of Physical Chemistry C
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2015
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IF 4.772
Dong Yang,Yuanyuan Sun,Zhenwei Tong,Yao Tian,Yuanbing Li,Zhongyi Jiang
Inspired by the bioadhesion mechanism found in mussel, a catechol derivative, 3-(3,4-dihydroxyphenyl)propionic acid (diHPP), is employed as both linker and reducer of Ag+ to synthesize the Ag/TiO2 nanotube (Ag/TNT) heterojunction under ambient conditions in this study. In the prepared Ag/TNT composite, Ag nanocrystals about 3.8 nm in diameter distribute over the TNT surface uniformly and form the heterojunction structure with TNT. The diHPP first links to the TNT surface through the bidentate chelation of catechol group with Ti4+ and then acts as both an anchor and a reducer to in situ nucleate and grow Ag nanocrystals on the TNT surface. By adjusting the AgNO3 concentration, the loading amount of Ag nanocrystals on the TNT surface can be controlled easily, and the visible-light absorption ability of Ag/TNT heterojunctions enhances with increasing the Ag loading amount. Moreover, their photocatalytic activity was evaluated by the degradation capability of Rhodamine B (RhB) under visible light. The Ag/TNT heterojunctions exhibit the high visible-light photocatalytic activity, which can almost degrade 100% RhB within 2 h. This excellent performance can be attributed to the local electric field caused by the surface plasmon resonance (SPR) of Ag nanocrystals and the high adsorption capability of TNTs with large specific surface area.
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JOURNAL OF APPLIED PHYSICS
·
2013
·Vol. 114
·期 20
·
IF 2.21
He Wangxiao,Huang Hongen,Yan Jin,Zhu Jian
The formation of the Au-TiO 2 nanocomposite on monolayer Graphene (GTA) by sequentially depositing titanium dioxide particles and gold nanoparticles on graphene sheet was synthesized and analyzed in our work. The structural, morphological, and physicochemical properties of samples were thoroughly investigated by UV-Vis spectrophotometer, Raman spectroscopy, Fourier transform infrared spectroscopy, atomic force microscopy, scanning electron microscope, and transmission electron microscope. Photocatalytic performance of GTA, graphene (GR), TiO 2, and TiO 2 -graphene nanocomposite (GT) were comparatively studied for degradation of methyl orange, and it was found that GTA had highest performance among all samples. More importantly, antibacterial performance of this novel composite against Gram-positive bacteria, Gram-negative bacteria, and fungus was predominant compared to GR, TiO 2 , and GT. And the result of biomolecules oxidation tests suggested that antimicrobial actions were contributed by oxidation stress on both membrane and antioxidant systems. Besides, the rate of two decisive processes during photocatalytic reaction, the rate of the charge transfer (k CT ) and the rate of the electron-hole recombination (k R ) have been studied by Perturbation theory, Radiation theory, and Schottky barrier theory. Calculation and derivation results show that GTA possesses superior charge separation and transfer rate, which gives an explanation for the excellent oxidation properties of GTA.
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ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Hui Zhang,Ronghua Shi,Anjian Xie,Juchuan Li,Long Chen,Ping Chen,Shikuo Li,Fangzhi Huang,Yuhua Shen
A novel inorganic/organic hybrid hydrogel system containing titanium dioxide (TiO2)/poly(ethylene glycol) double acrylates (PEGDA) was prepared by in situ photopolymerization on tumor cells for photodynamic therapy (PDT). TiO2 nanorods with diameter of ∼5 nm and length of ∼25 nm in this system presented dual functions, as effective photosensitizers for PDT and initiators for causing the in situ formation of hydrogel, under near-infrared (NIR) irradiation. The hybrid hydrogel retained the TiO2 around tumor cell to form a drug-loaded hydrogel shell. This resulted in a high concentration of singlet oxygen (1O2) under NIR irradiation, which induced apoptosis of tumor cell. Also, the hydrogel could reduce the side effects by preventing TiO2 from migrating to normal tissue. Furthermore, the TiO2 nanorods in this hydrogel shell were photochemically recyclable and could be reused in regular treatment. The outcomes of this study provide a new way to exploit multifunction of inorganic semiconductor nanomaterials for a variety of biomedical applications.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2014
·Vol. 97
·期 6
·1944-1951
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IF 2.428
Weibo Chen,Zhijun Ma,Xuanzhao Pan,Zhongliang Hu,Guoping Dong,Shifeng Zhou,Mingying Peng,Jianrong Qiu
Structural design is of great importance to the performance of photocatalysts in environmental remediation. Therefore, micro/nanofibrous morphology and nanoporous local structures have been found to be beneficial to improve the photocatalytic activity. In this investigation, we report the design and fabrication of flexible and thermal stable nanoporous SiO 2 –TiO 2 composite fibers as efficient photocatalysts. Combining electrospinning and modified Stöber techniques, core-shell and mesoporous SiO 2 fibers with high flexibility were fabricated and employed as the scaffold for supporting TiO 2 nanoparticles. A nanoporous shell of TiO 2 nanoparticles was then muffled over the SiO 2 fibers to form core@dual-shell SiO 2 –TiO 2 composite fibers with hierarchically porous structure, which were conveniently patterned into a nonwoven, recyclable film. This nonwoven film exhibits better photocatalytic activity for Rhodamine B degradation under UV irradiation compared with some other TiO 2 -based materials reported in recent years.
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LUMINESCENCE
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2014
·Vol. 30
·期 1
·98-101
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IF 1.675
Xuan Liu,Nianyue Wang,Wei Zhao,Hui Jiang
This work reports for the first time a potential-based nano-electrochemiluminescent (ECL) pH sensor, using anatase TiO 2 nanocrystals (NCs) as the ECL probe. The first ECL peak potential of the TiO 2 NCs shifted negatively with increasing pH, showing a linear range from −0.47 V (vs Ag/AgCl) at pH 3 to −1.06 V at pH 10. This phenomenon was attributed to the absorption of ‘potential-determining ions’ of OH − on the surface of TiO 2 NCs, leading to larger impedance of the electron injection. Other common ‘potential-determining ions’, such as phosphate, induced a slight potential shift of 0.03 V at a concentration of 0.1 M. Using urease as an enzyme model, a urea biosensor was developed by the simultaneous modification of urease and TiO 2 NCs on indium–tin oxide (ITO) electrodes. The biosensor, measured on the basis of the pH increase caused by the enzyme catalysis reaction, had a linear range of 0.01–2.0 mM, with a potential shift of 0.175 V. The as-prepared pH sensor, which has simple construction procedures and acceptable sensitivity and selectivity, may provide new avenues for the construction of ECL bioanalytical methodologies. Copyright © 2014 John Wiley & Sons, Ltd.
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高影响因子
INTEGRATED FERROELECTRICS
·
2014
·
IF 0.371
Juan Hou,Tingjun Zhou,Jiongyu Wang,Haibin Cao
Here we used a hydrothermal approach to prepare mixture polymorphs TiO2 nanoparticles homogenously disperse on the reduced graphene oxide sheets. The prepared products were characterized by X-ray powder diffraction, transmission electron microscope, thermogravimetry-differential scanning calorimetry and UV–vis Spectrophotometer. Compared with pure TiO2, the TiO2- reduced graphene oxide composite exhibited better photocatalytic activity. The degradation percentage of rhodamine B reached a degree of 94.6% after visible light irradiation for 20 min, which is much higher than pure TiO2, 22.4%. The possible reason for the enhanced photocatalytic activity was also investigated.
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CATALYSIS COMMUNICATIONS
·
2013
·
IF 2.915
Jie Cui,Ting He,Xu Zhang
Platinum ion doped magnetic TiO 2 (Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 ) hybrid microspheres with uniform magnetic cores were synthesized and characterized in this work. The results indicate that the photoactivity of Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 is much higher than Fe 3 O 4 @SiO 2 @TiO 2 for the decolorization of acid orange 20 under UV–visible light irradiation. The trend for the final degradation ratio with Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 is quite small, even after seven repetitive experiments. These data indicate that the magnetic microspheres possess the potential to be effective and stable catalysts. The results demonstrate that the Pt ion doped magnetic catalyst meets the needs for both immobilization and high photoactivity.
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Journal of Materials Chemistry A
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2014
·Vol. 2
·期 31
·12304-12310
·
IF 0
Dahu baiyila,Xiaohui Wang,Xin Li,Bao sharileaodu,Xiaotian Li,Liang Xu,Zongrui Liu,Limei Duan,Jinghai Liu
TiO2 nanofibers integrating space-separated magnetic nanoparticles and heterostructures have been fabricated to construct multifunctional photocatalysts with excellent photocatalytic activity and magnetic recoverability. The electrospinning technique has been employed to prepare the Fe3O4-embedded TiO2 (Fe3O4@TiO2) magnetic nanofibers. TiO2/CdS heterostructures (Fe3O4@TiO2/CdS) formed by depositing CdS nanoparticles onto the Fe3O4@TiO2 nanofibers have been obtained by a hydrothermal process. The heterostructures improve the photocatalytic activity and widen the range of solar light response. Under visible light irradiation, the photocatalytic activity of the Fe3O4@TiO2/CdS nanofibers is 5.11 times higher than that of the Fe3O4@TiO2 nanofibers and is 1.22 times than that of CdS nanoparticles. In addition, it exhibits a slight increase under simulated solar light with the photocatalytic degradation ratio 1.1 times higher than that under visible light. The loading amounts of CdS only have effects on the photocatalytic activity under visible light and simulated solar light. The Fe3O4@TiO2/CdS nanofiber exhibits a saturation magnetization strength of 1.572 emu g−1 and can be effortlessly separated and recovered by applying a contactless magnetic field. The cycling stability is durable after magnetic separation and recycling.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2014
·Vol. 21
·期 3
·1343-1349
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IF 5.696
Zhian Zhang,Qiang Li,Shaofeng Jiang,Kai Zhang,Yanqing Lai,Jie Li
Graphical Good conduct : A core–shell hybrid architecture hollow carbon nanofiber@titanium dioxide (HCNF@TiO 2 ) composite has been successfully prepared as an improved conductive matrix for encapsulating sulfur as a cathode material for lithium–sulfur batteries. This hybrid composite exhibited improved electrochemical performance over the original HCNF–S composite (see figure). A hollow carbon nanofiber hybrid nanostructure anchored with titanium dioxide (HCNF@TiO 2 ) was prepared as a matrix for effective trapping of sulfur and polysulfides as a cathode material for Li–S batteries. The synthesized composites were characterized and examined by X-ray diffraction, nitrogen adsorption–desorption measurements, field-emission scanning electron microscopy, scanning transmission electron microscopy, and electrochemical methods such as galvanostatic charge/discharge, rate performance, and electrochemical impedance spectroscopy tests. The obtained HCNF@TiO 2 –S composite showed a clear core–shell structure with TiO 2 nanoparticles coating the surface of the HCNF and sulfur homogeneously distributed in the coating layer. The HCNF@TiO 2 –S composite exhibited much better electrochemical performance than the HCNF–S composite, which delivered an initial discharge capacity of 1040 mA h g −1 and maintained 650 mAh g −1 after 200 cycles at a 0.5 C rate. The improvements of electrochemical performances might be attributed to the unique hybrid nanostructure of HCNF@TiO 2 and good dispersion of sulfur in the HCNF@TiO 2 –S composite.
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APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Penghui Shao,Jiayu Tian,Zhiwei Zhao,Wenxin Shi,Shanshan Gao,Fuyi Cui
Visible light photocatalytic activity of amorphous TiO 2 doped with carbon is prepared by a facile sol-gel route for the first time. The most active sample with mesostructure of amorphous phase, high surface area (273 m 2 g −1 ) and large pore volume (0.33 cm 3 g −1 ) is identified by X-ray diffractometer, Raman spectrometer, transmission electron microscope and N 2 adsorption–desorption isotherms. In addition, the most active sample is characterized by Fourier transform-infrared spectrometer, X-ray photoelectron spectrometer, UV–vis diffuse reflectance spectrometer and luminescence spectrometer. The results show that the most active sample with oxygenic groups has a narrower bandgap and lower recombination of electron–hole, due to the carbon doping and phase of amorphous. Effective photodegradation capability and stability of rhodamine B and colorless 4-chlorophenol are verified by photocatalytic tests under visible light irradiation. A possible mechanism of amorphous TiO 2 doped with carbon for visible light photocatalysis is proposed. The findings of this paper will provide new insights to design visible light-induced photocatalyst based on amorphous TiO 2 for organic removal.
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Journal of the Iranian Chemical Society
·
2014
·Vol. 12
·期 5
·765-770
·
IF 1.406
Xu Zhaozan,Zhu Jiang,Liao Xiaoqing,Ni Haitao
The PET/SiO 2 /TiO 2 composites were prepared via in situ polymerization. The effect of nano SiO 2 and TiO 2 content on crystallization behavior and thermal stability of PET was investigated by differential scanning calorimeter (DSC), X-ray diffraction (XRD), and thermogravimetry. The morphology of SiO 2 and TiO 2 particles and their dispersion in PET were studied by scanning electron microscope. The addition of SiO 2 and TiO 2 nano particles affects the thermal stability and flame property of PET and the effect depends on their content. It also affects the perfect degree of PET crystal. From DSC data analysis, crystallization temperature and enthalpy value reduce with SiO 2 and TiO 2 nano particles, but they increase with increasing SiO 2 and TiO 2 loading. A low content of SiO 2 and TiO 2 nano particles will decrease the degree of crystallinity, but enough amounts of them will increase the degree of crystallinity of PET because of heterogeneous nucleating effect of the particles. The degree of crystallinity calculated based on XRD data also shows this phenomenon. From XRD results analysis, it is also found that the average grain size of PET decreases with a little of SiO 2 and TiO 2 nano particles, but it increases with increasing content of particles.
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APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Xiaohai Bu,Yuming Zhou,Man He,Zhenjie Chen,Tao Zhang
Optically active silica/titania/substituted polyacetylene (SiO 2 /TiO 2 /SPA) multilayered core–shell nanocomposite was successfully prepared by the combination of subsequent surface titania deposition and polymer grafting on the bare silica nanosphere. The chiral amino acid-based SPA copolymer serving as the organic shell was optically active and adopted a predominately single-handed helical conformation. The SiO 2 /TiO 2 /SPA nanospheres were characterized by Fourier transform infrared spectroscopies (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) to record the formation of the multilayered architecture and the results clearly showed that the inorganic/organic hybrid nanoparticles exhibited hierarchical multilayered core–shell construction. The SPA outer shell experienced an enhancement in thermal stability and still remained considerable optical activity after grafting to the SiO 2 /TiO 2 nanosphere. The SiO 2 /TiO 2 /SPA nanocomposite had an infrared emissivity value ( ɛ = 0.548) at the wavelength of 8–14 μm which was much lower than each of its components. The reduced infrared emissivity values proved that the strengthened interfacial interactions originating from the coating SPA had an effective synergistic effect with the semiconductive anatase TiO 2 nanoparticles on silica sphere in lowering the infrared emissivity value.
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