APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yi Chen,Wangyang Lu,Haibin Shen,Yan Gu,Tiefeng Xu,Zhexin Zhu,Gangqiang Wang,Wenxing Chen
Solar-driven photocatalysis has shown tremendous potential for environmental remediation, but photocatalysts with the strong oxidation ability usually destroy some organic carriers. Herein, we constructed a graphitic carbon nitride (g-C 3 N 4 )-shielding polyester fiber (PET)/titanium dioxide (TiO 2 ) composite (g-C 3 N 4 -TiO 2 @LMPET) by using g-C 3 N 4 as an isolation layer to protect the PET from the oxidation damage by hydroxyl radicals ( OH). The results of photoluminescence and photocurrent indicated that the g-C 3 N 4 -TiO 2 @LMPET has lower photogenerated charge recombination rate. Meanwhile, g-C 3 N 4 broadens the absorption range of the composite to visible region. Therefore, the g-C 3 N 4 -TiO 2 @LMPET composite exhibited a significantly enhanced photocatalytic performance toward the degradation of sulfaquinoxaline (SQX) and thiamethoxam under solar irradiation. Moreover, the g-C 3 N 4 -TiO 2 @LMPET exhibited good repeatability in cyclic experiments. Finally, the possible degradation pathways and mechanisms of SQX and thiamethoxam were proposed. Overall, our work provides a feasible method for constructing efficient and stable photocatalytic materials to eliminating emerging contaminants.
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高影响因子
KEY ENGINEERING MATERIALS
·
2019
·
IF 0
Fu Chang Peng,Qi Lai,Can Yu Zhong,Yan Cui,Xian Jie Liao,Qiao Chu Liu,Chuan Hai Xiao
The TiO2 nanoparticles with different Yb doping amount were prepared by a facile sol-gel method. The samples were characterized by XRD, TEM, XPS, UV-Vis, and PL, etc. The influence of Yb-doping on structure and visible light photocatalytic activity of mixed phase TiO2 was evaluated by photocatalytic degradation of methylene blue (MB) under the irradiation of fluorescent lamp. The results show that ytterbium appeared two kinds of Yb3+ and Yb2+ valence state on the surface of TiO2. Ytterbium doping can restrain the phase transfer from anatase to rutile, prevent the grain growth, and increase the surface hydroxyl content. Appropriate amount of Yb doping and the proportions of rutile and anatase mixed phase can effectively inhibit the recombination of photogenerated electron and hole, expand the wavelength range of absorption spectrum, and improve the photocatalytic performance of TiO2. Meanwhile, the photocatalytic activity of the Yb-TiO2 samples was the best under the irradiation of fluorescent light when the sintered temperature T=500°C and n(Yb):n(Ti)=0.009, it was 95.2% within 6 h and significantly higher than 56.4% of pure TiO2 under the same experimental conditions.
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DOI
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yuan Li,Yusheng Zhou,Yong Wang,Ru Zhou,Qiang Ling,Haihong Niu,Wei Zhang,Chaoqun Wang,Jihong Qiu,Zhiqiang Guo,Jinzhang Xu
Urchin-like TiO 2 hierarchical microspheres (UTHMs) with an extremely large surface area of 331 m 2 g −1 were synthesized via a facile one-pot hydrothermal method and studied for dye-sensitized solar cells (DSSCs) application. In-situ growth of Au nanoparticles (NPs) on the surface of the UTHMs were further conducted to achieve Au-decorated UTHMs (Au-UTHMs). A series of novel composite photoanode films were designed through the combined use of Au-UTHMs and UTHMs at different mass ratios. The DSSC constructed with the composite photoanode prepared under an optimal Au-UTHMs to UTHMs ratio of 2 wt% yields a considerable power conversion efficiency of 7.21%, which was markedly higher than that of the pure P25 NPs based device (5.19%) and pure UTHMs based device (6.10%). The significantly enhanced performance of the composite photoanode based DSSC can be attributed to the synergistic effect of two benefits: (1) the large specific surface area, strong light scattering and fast electron transfer channels arising from the novel hierarchical features of UTHMs, and (2) the enhanced light absorption owing to the localized surface plasmon resonance (LSPR) effect of Au NPs.
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高影响因子
THIN SOLID FILMS
·
2018
·
IF 1.939
Bo Wang,Chao Chen,Hongtao Liu,Bingbing Xia,Yinan Fan,Tianchi Chen
Tungsten trioxide (WO 3 ) and titanium dioxide (TiO 2 ) decorated commercial stainless steel meshes (SSM 304) were fabricated by chemical deposition and dip coating. WO 3 and TiO 2 particles were firmly and uniformly coated on the membrane surfaces, forming rough micro-nano double structures with underwater superoleophobicity, large contact angles and low oil-adhesion characteristic. Furthermore, the as-prepared membranes achieved effective oil-in-water (O/W) emulsions separation with high efficiency up to 98.5% or more. The separation of O/W emulsions was easily implemented under gravity with water fluxes of >200 L m −2 h −1 or low pressure with water fluxes up to 1300 L m −2 h −1 or more. In addition, the superhydrophilic membranes with WO 3 /TiO 2 coatings were demonstrated for high oil rejection, stable underwater superoleophobic properties after abrasion treatment and steady water permeation flux after several cycles.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 4
·2021-2028
·
IF 2.956
Xiaokai Li,Qiangqiang Zhu,Yangyang Xu,Xiaojian Mao,Minghui Feng,Benxue Jiang,Long Zhang
Highly transparent Y 2 O 3 ceramics using TiO 2 as an additive were synthesized by presintering and hot isostatic pressing (HIP). The effects of TiO 2 contents and sintering conditions on the optical properties of the final transparent ceramics were investigated. A small amount (0.04-0.16 wt%) may decrease the densification temperature by about 200°C. The Y 2 O 3 ceramics doped with 0.16 wt% TiO 2 revealed a transparency of 82% in the wavelength range 1-6 μm. The thermal conductivity of the samples is about 11.8 W/m K at 25°C, which is close to that of the undoped Y 2 O 3 ceramics.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Hanlin Chen,Yen-Ping Peng,Ting-Yu Chen,Ku-Fan Chen,Ken-Lin Chang,Zhi Dang,Gui-Ning Lu,Hongping He
This study employed BiOI-deposited TiO 2 nanotube arrays (BiOI-TNTAs) electrode in a photoelectrochemical (PEC) system to oxidize Ibuprofen and generate hydrogen in the anodic and cathodic chamber, respectively. FESEM results revealed the diameter of TiO 2 nanotubes was 90–110 nm. According to the XRD analysis, the BiOI-TNTAs were dominated by the anatase phase and tetragonal structure of BiOI. XPS results confirmed the coexistence of BiOI in the BiOI-TNTAs associated with Bi (33.76%) and I (8.81%). UV–vis absorption spectra illustrated BiOI-TNTAs exhibit strong absorptions in the visible light region. The PEC method showed the best degradation efficiency for Ibuprofen is a rate constant of 3.21 × 10 −2 min −1 . The results of the Nyquist plot revealed the recombination of photogenerated electron-hole pairs was inhibited as the bias potential was applied. Furthermore, the Bode plot demonstrated the lifetime (τ el ) of photoexcited electrons of BiOI-TNTAs was 1.8 and 4.1 times longer than that of BiOI-Ti and TNTAs, respectively. In the cathodic chamber, the amount of hydrogen generation reached 219.94 μM/cm 2 after 3 h of reaction time.
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PubMed
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2012
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IF 2.947
Fang Deng,Xubiao Luo,Ke Li,Xinman Tu,Shenglian Luo,Lixia Yang,Ninghui Zhou,Hongying Shu
Visible light responsive iron-doped TiO 2 (Fe 3+ /TiO 2 -IL) was synthesized by sol–gel method using 1-vinyl-3-propylimidazolium iodide (VPIM + I − ) as a reaction medium. VPIM + I − not only made the morphological and structural changes of Fe 3+ /TiO 2 -IL, but also extended its absorption edge to the visible light region. The photocatalytic activity of Fe 3+ /TiO 2 -IL was tested in the degradation of 2-nitrophenol under simulated solar light irradiation. The photocatalytic activity of Fe 3+ /TiO 2 -IL was higher than the samples prepared in the reaction medium without VPIM + I − . Moreover, the effect of pH and H 2 O 2 on the photocatalytic activity of Fe 3+ /TiO 2 -IL was also investigated. Fe 3+ /TiO 2 -IL showed high photocatalytic activity in acidic environment, and H 2 O 2 had a dual effect on the photocatalytic activity Fe 3+ /TiO 2 -IL.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2014
·Vol. 21
·期 3
·1343-1349
·
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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高影响因子
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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高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 293
·期 1
·277-288
·
IF 2.41
Cao Zhihai,Yang Liu,Chen Hangnan,Xu Chang,Qi Dongming,Zhu Shudi,Ziener Ulrich
Au/amorphous TiO 2 nanocomposite particles with high visible-light photocatalytic activity were conveniently prepared in inverse miniemulsions. The materials were synthesized through a combination of a sol–gel process and in situ reduction of HAuCl 4 by hydrazine to Au nanoparticles in the nanocomposite particles. The photocatalytic activity of the as-synthesized Au/amorphous TiO 2 nanocomposite particles is much higher than that of the Au/anatase TiO 2 and Au/rutile TiO 2 nanocomposite particles prepared by calcination. Therefore, no further heat treatments are required to achieve visible-light photocatalytic active catalysts. The loading of Au in the nanocomposite particles could be conveniently tuned by varying the HAuCl 4 loading in the dispersed phase of the inverse miniemulsions. Only a small amount of Au was required to achieve a high photocatalytic activity. The size, particle morphology, TiO 2 phase, optical property, elemental content and distribution, and pore properties of the Au/TiO 2 nanocomposite particles were systematically characterized by dynamic light scattering, transmission/scanning electron microscopy, X-ray diffraction, Raman spectroscopy, UV–vis spectroscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and N 2 sorption measurements.
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高影响因子
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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高影响因子
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
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