INTEGRATED FERROELECTRICS
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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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高影响因子
CATALYSIS TODAY
·
2013
·
IF 2.98
Zhihui Ai,Na Wu,Lizhi Zhang
In this study, we report that highly water dispersible TiO 2 nanocrystals could be synthesized via a facile nonaqueous sol–gel method using titanium tetrachloride and ethanol as the precursors. The resulting TiO 2 samples were 5–10 nm in diameter according to characterizations with X-ray diffraction, transmission electron microscopy, and high resolution transmission electron microscopy. X-ray photoelectron spectroscopy, thermal gravimetric analysis, and Fourier-transform infrared spectroscopy analysis revealed that carbonaceous species were formed and bound on the surface of TiO 2 nanocrystals during the synthesis. These carbonaceous species could prevent the agglomeration of TiO 2 nanocrystals and endow the TiO 2 nanocrystals with highly water dispersible property and superior photocatalytic activity on the degradation of organic pollutant under visible light irradiation. We believe that the resulting TiO 2 nanocrystals with highly water dispersibility and superior photocatalytic activity could find wide applications in many fields.
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高影响因子
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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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 131
·期 3
·
IF 1.395
Peng Fei,Benhua Fei,Yan Yu,Hanguo Xiong,Jun Tan
In this study, bamboo fiber/high-density polyethylene (HDPE) composites were prepared, and the effects of nano-TiO 2 on their thermal properties and crystallization behavior were investigated via thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results show that the addition of nano-TiO 2 improved the thermal stability and had a dual function in the crystallization behavior of the composites. On one hand, it functioned as a nucleating agent. The addition of 2 wt % nano-TiO 2 promoted the crystallization, which caused the increase of the crystallization rate and crystallinity degree, as well as the micronization of the crystalline grain. On the other hand, intermolecular hydrogen bonds and covalent bonds were formed between nano-TiO 2 and the polymer matrix, which hindered the crystallization of the composites. When the content of nano-TiO 2 was continually increased, the inhibitory effect of the crystallization was gradually enhanced, which resulted in a decrease in the crystallization rate and crystallinity degree of the composites. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39846.
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Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 38
·7554-7559
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IF 4.726
Shupei Zhang,Guifang Xu,Lingshan Gong,Hong Dai,Yilin Li,Zhensheng Hong,Yanyu Lin
TiO2-B nanorods, with excellent properties including large specific surface area, open structures with significant voids, and continuous channels, were explored for the first time in the photoelectrochemical biosensing field. To reduce the destructive effect of UV light on biomolecules, dopamine was introduced onto the TiO2-B nanorod surface through the coordination of dopamine to the undercoordinated titanium atoms of the TiO2-B nanorods, which makes the complex a promising matrix for subsequent biosensing. Furthermore, concanavalin A as a recognition element was attached onto the TiO2-B nanorod/dopamine modified electrode surface by virtue of covalent interaction between concanavalin A and dopamine. Accordingly, a new competitive-like non-enzymatic photoelectrochemical biosensor was established by using glucose labeled SiO2 nanospheres of fixed concentration as photoelectrochemical signal inhibitors competing with target glucose of various concentrations for reaction with concanavalin A. Moreover, this ultrasensitive biosensor with excellent analytical performance was successful applied to noninvasive glucose determination in human saliva. Promisingly, the successful application of TiO2-B nanorods in this research provides a new consideration in the selection of excellent photoactive materials for photoelectrochemical sensing.
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PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 91
·74774-74782
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IF 3.84
Wenjun Zhu,Hui Yang,Wenkui Zhang,Hui Huang,Xinyong Tao,Yang Xia,Yongping Gan,Xingzhong Guo
A Li4Ti5O12/TiO2/carbon (Li4Ti5O12/TiO2/C) nanocrystalline composite has been successfully synthesized by a facile sol–gel method and subsequent calcination treatment. Moreover, pure Li4Ti5O12, Li4Ti5O12/C and Li4Ti5O12/TiO2 composites have also been synthesized for comparison. All the samples present a nanocrystalline structure with a uniform size distribution, and abundant phase interfaces can be detected for the Li4Ti5O12/TiO2 and Li4Ti5O12/TiO2/C composites. Electrochemical measurements demonstrate that the resultant Li4Ti5O12/TiO2/C composite exhibits a superior rate capability and cycle stability in comparison with pure Li4Ti5O12, Li4Ti5O12/C and Li4Ti5O12/TiO2 composites, which can be attributed to a high grain boundary density, abundant phase interfaces and in situ formed carbon, for storing extra lithium ions, enhancing rapid lithium insertion/extraction kinetics and improving the electron transport rate.
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高影响因子
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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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
·
IF 7.435
Wenjun Liu,Jingyu Cai,Zhengxin Ding,Zhaohui Li
TiO 2 /RGO composite aerogels with TiO 2 nanostructures grown on interconnected three-dimensional RGO porous networks were fabricated via a facile one-pot hydrothermal method. The as-obtained composite aerogels show controllable and continuously tunable surface wettability from super-hydrophobic to super-hydrophilic depending on the amount of incorporated TiO 2 . The TiO 2 /RGO composite aerogels with varied surface wettability can selectively degrade different pollutants in aqueous systems. The capability of forming the TiO 2 /RGO aerogels with tunable surface wettability for selective photocatalysis is important since such materials are especially useful in some systems which contain extremely poisonous contaminants in low concentration together with large quantity of un-poisonous chemicals.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 7
·3448-3453
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IF 2.371
Zhang Peigen,Zhang Chunyan,Xie Anjian,Li Cun,Song Jiming,Shen Yuhua
Template-free method is used to facilely synthesize TiO 2 hollow microspheres via one-step hydrothermal method. Interestingly, the TiO 2 hollow microspheres have porous shell with thickness of about 450 nm. The formation mechanism of the hollow@porous TiO 2 microspheres involves the formation and aggregation of TiO 2 nanoparticles followed by oriented growth, etching of HF, and then Ostwald ripening and transformation process. The prepared TiO 2 microspheres show a reversible capacity of ~170 mAh g −1 after 150 cycles at a current density of 0.6 C and also exhibit a good rate capability of 40.8 mAh g −1 at a current density of 24 C due to the unique hollow@porous structure, which can offer more sites for the storage and insertion of Li ions, and accelerate electrolyte diffusion and Li ions transport. The results also indicate that the as-prepared TiO 2 material possesses excellent electrochemical performances, which may be an ideal anode material for lithium ion battery.
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高影响因子
RSC Advances
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2015
·Vol. 6
·期 1
·409-421
·
IF 3.84
Ayyakannu Sundaram Ganeshraja,Subramani Thirumurugan,Kanniah Rajkumar,Kaixin Zhu,Yanjie Wang,Krishnamoorthy Anbalagan,Junhu Wang
The structural, electronic, magnetic and photocatalytic properties of Sn doped TiO2 diluted magnetic semiconductor nanoparticles (NPs) prepared by a simple hydrothermal method were systematically investigated by various conventional techniques and 119Sn Mössbauer spectroscopy. Anatase, mixed (anatase–rutile) and rutile phases of Sn–TiO2 NPs were obtained by adding different amounts of SnCl4 into a titanium nitrate aqueous solution. Photocatalytic degradation of methyl orange and phenol derivatives (RPhOH) were studied under visible and UV light irradiation in water, respectively. The photocatalytic activities of prepared NPs were found to be drastically related to the structural, optical and ferromagnetic properties. A significant relationship was observed between the Hammett substitution constants of RPhOH and the photocatalytic activity. Among all the samples, the anatase phase with low Sn content performed with the best photocatalytic and ferromagnetic characteristics at room temperature.
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Journal of Materials Chemistry A
·
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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RSC Advances
·
2017
·Vol. 7
·期 79
·50064-50071
·
IF 3.108
Shengzhe Zhao,Zhiqiang Cheng,Lijuan Kang,Mingtang Li,Zhiling Gao
Hollow TiO2 and TiO2/ZnO nanotubes were produced using a simple and novel approach combining electrospinning with an impregnation calcination method. Using a photoreduction method, silver nanoparticles (AgNps) were successfully decorated on the surface of nanotubes. During the synthesis process, the electrospinning procedure provided sacrificial templates for the fabrication of hollow nanotubes by producing PAN nanofibers, which can be immobilized on the TiO2 surface through a soaking method. Later, the composite nanofibers of TiO2/PAN were calcined into pure TiO2 nanotubes after complete combustion of the sacrificial templates. The morphology of the samples was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The structure and components of the samples were characterized by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS). Upon blending ZnO into TiO2, a new crystallite ZnTiO3 was formed in addition to the ZnO and TiO2 crystallites, and the ultra-violet light absorption efficiency was detected using UV-vis diffuse reflectance spectroscopy (DRS). The photocatalytic properties were evaluated using the degradation of methyl orange (MO) dye. As observed from the results, the Ag/TiO2/ZnO nanotubes could degrade MO efficiently under UV irradiation, which showed excellent photocatalytic activity compared to pure TiO2. The synthetic mechanism of Ag/TiO2/ZnO nanotubes and the mechanism for the enhanced photocatalytic activity have been proposed.
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