CATALYSIS TODAY
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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
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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高影响因子
ACS Applied Materials & Interfaces
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2015
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IF 6.723
Zichao Lian,Pengpeng Xu,Wenchao Wang,Dieqing Zhang,Shuning Xiao,Xin Li,Guisheng Li
Fullerene (C60) enhanced mesoporous CdS/TiO2 architectures were fabricated by an evaporation induced self-assembly route together with an ion-exchanged method. C60 clusters were incorporated into the pore wall of mesoporous CdS/TiO2 with the formation of C60 enhanced CdS/TiO2 hybrid architectures, for achieving the enhanced photostability and photocatalytic activity in H2 evolution under visible-light irradiation. Such greatly enhanced photocatalytic performance and photostability could be due to the strong combination and heterojunctions between C60 and CdS/TiO2. The as-formed C60 cluster protection layers in the CdS/TiO2 framework not only improve the light absorption capability, but also greatly accelerated the photogenerated electron transfer to C60 clusters for H2 evolution.
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PubMed
高影响因子
Journal of Materials Chemistry A
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2015
·Vol. 3
·期 9
·4903-4908
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IF 7.443
Jianjiang Li,Jingjiao Zhang,Liang Fang,Junling Wang,Mingrong Shen,Xiaodong Su
TiO2 thin films were grown on solar-grade (SoG) multicrystalline silicon (mc-Si) wafers with different multiscale structures by using a liquid phase deposition (LPD) method. It was found that due to the carrier injection from mc-Si wafers, the photocatalytic activity of the TiO2 films could be expanded from the ultraviolet to the visible light region. In addition, further enhanced visible light photocatalytic properties could be achieved by introducing a nano-texture and p–n junction into the mc-Si wafer, which was ascribed to the excellent light trapping and strong carrier separating properties. Our results suggest that density-graded nanostructures applied to the TiO2 photocatalyst can enhance optical absorption, benefit carrier separation, and improve photocatalytic activity.
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CHEMICAL ENGINEERING JOURNAL
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2017
·
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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高影响因子
Journal of Coatings Technology and Research
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2017
·Vol. 14
·期 6
·1271-1278
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IF 1.557
Zhu Xiao Dong,Liu Yu,Li Zhao
The physical and mechanical properties of wood and wood-based panels can be effectively improved by modification with nanoparticles. This paper focuses on effects of modifying veneer with titanium dioxide (TiO 2 ) nanoparticles on the performance of a waterborne coating and formaldehyde emission. Commercial waterborne varnish was used to apply a surface finish on the modified veneered panels. Changes caused by TiO 2 nanoparticle treatment that could affect the finishing performance were measured. The results showed slight increases in the weight and contact angle of the veneers treated with TiO 2 nanoparticles, whereas the modified veneered panels after surface finishing presented improved hardness at high nanoparticle loadings. Modification of the veneers by nanoparticles had a minor negative influence on the coating glossiness and adhesion due to a blocking effect between the coating film and the modified veneers. Formaldehyde emissions were considerably reduced due to degradation by the TiO 2 particles under UV-light irritation.
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Science Advances
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2017
·Vol. 3
·期 6
·
IF 0
Pengwei Wang,Guofeng Zhao,Yu Wang,Yong Lu
Oxidative coupling of methane (OCM) is a promising method for the direct conversion of methane to ethene and ethane (C2 products). Among the catalysts reported previously, Mn2O3-Na2WO4/SiO2 showed the highest conversion and selectivity, but only at 800° to 900°C, which represents a substantial challenge for commercialization. We report a TiO2-doped Mn2O3-Na2WO4/SiO2 catalyst by using Ti-MWW zeolite as TiO2 dopant as well as SiO2 support, enabling OCM with 26% conversion and 76% C2-C3 selectivity at 720°C because of MnTiO3 formation. MnTiO3 triggers the low-temperature Mn2+↔Mn3+ cycle for O2 activation while working synergistically with Na2WO4 to selectively convert methane to C2-C3. We also prepared a practical Mn2O3-TiO2-Na2WO4/SiO2 catalyst in a ball mill. This catalyst can be transformed in situ into MnTiO3-Na2WO4/SiO2, yielding 22% conversion and 62% selectivity at 650°C. Our results will stimulate attempts to understand more fully the chemistry of MnTiO3-governed low-temperature activity, which might lead to commercial exploitation of a low-temperature OCM process.
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CATALYSIS COMMUNICATIONS
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2017
·
IF 3.33
Juanjuan Liu,Shihui Zou,Linfang Lu,Hongting Zhao,Liping Xiao,Jie Fan
Pt nanoparticles supported on anatase TiO 2 is an efficient and stable catalyst for room-temperature selective oxidation of benzyl alcohol under base-free aqueous conditions with ambient air as the oxidant. The result shows that the anatase content of support has a big influence on the activity of Pt/TiO 2 . Higher anatase content results in better performance, with optimal activity for Pt/anatase TiO 2 of 76.7 ± 1.5% in conversion and nearly 100% in selectivity to aldehyde within 10 h. Moreover, a quasi-linear relationship between anatase content of the support and the activity of Pt/TiO 2 is observed.
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Advanced Science
·
2017
·Vol. 4
·期 10
·1700008
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IF 9.034
Xin Yao,Junhui Liang,Yuelong Li,Jingshan Luo,Biao Shi,Changchun Wei,Dekun Zhang,Baozhang Li,Yi Ding,Ying Zhao,Xiaodan Zhang
Intensive studies on low-temperature deposited electron transport materials have been performed to improve the efficiency of n-i-p type planar perovskite solar cells to extend their application on plastic and multijunction device architectures. Here, a TiO 2 film with enhanced conductivity and tailored band edge is prepared by magnetron sputtering at room temperature by hydrogen doping (HTO), which accelerates the electron extraction from perovskite photoabsorber and reduces charge transfer resistance, resulting in an improved short circuit current density and fill factor. The HTO film with upward shifted Fermi level guarantees a smaller loss on V OC and facilitates the growth of high-quality absorber with much larger grains and more uniform size, leading to devices with negligible hysteresis. In comparison with the pristine TiO 2 prepared without hydrogen doping, the HTO-based device exhibits a substantial performance enhancement leading to an efficiency of 19.30% and more stabilized photovoltaic performance maintaining 93% of its initial value after 300 min continuous illumination in the glove box. These properties permit the room-temperature magnetron sputtered HTO film as a promising electron transport material for flexible and tandem perovskite solar cell in the future.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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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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高影响因子
RSC Advances
·
2015
·Vol. 6
·期 5
·4090-4100
·
IF 3.84
Jing Guo,Shaojun Yuan,Wei Jiang,Hairong Yue,Zhe Cui,Bin Liang
Surface-fluorinated TiO2 (F-TiO2) particles was synthesized by a simple fluorosilanization method to serve as a visible-light photocatalyst for rapid degradation of Rhodamine B (RhB) dyes. The fluroalkylsilane (FAS-17) was covalently immobilized on the TiO2 particles via robust Si–O bonds. The changes in surface properties of the F-TiO2 particles were characterized by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM) and zeta potential measurements. The optical property of the F-TiO2 particles was determined by UV-visible spectroscopy. Upon the fluorination modification, the zeta potential of TiO2 particles switched from positive to negative, whilst the optical property of bulk TiO2 particles remained almost unchanged. Photodegradation experimental results demonstrated that zwitterionic RhB dyes were more favorably adsorbed on F-TiO2 rather than on the Ti(IV) sites of the pristine TiO2, and that the photodegradation reaction of RhB on F-TiO2 proceeded much faster than that on the pristine TiO2. However, the adsorption and photodegradation rate of anionic methyl orange (MO) dyes did not show an obvious change on F-TiO2. These results suggested that the molecular structure of dyes played a key role in visible-light photodegradation reactions on F-TiO2 particles. Positive-charged diethylamine groups of RhB molecular structures were postulated to promote the adsorption of RhB dyes on the surface of F-TiO2 particles, thus leading to easy electron injection and induction of rapid photodegradation under visible-light illumination.
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