Journal of Materials Chemistry B
·
2014
·Vol. 2
·期 35
·5775-5784
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IF 0
Song Shen,Xiaomeng Guo,Lin Wu,Meng Wang,Xinshi Wang,Fenfen Kong,Haijun Shen,Meng Xie,Yanru Ge,Yi Jin
Multifunctional dual-core@shell (Fe3O4–NaYF4@TiO2) nanocomposite (DCSNC) loaded with doxorubicin (DOX) have been developed for synergetic sonodynamic cancer chemotherapy, where titanium dioxide (TiO2) is employed as a sonosensitizer for sonodynamic therapy (SDT) of the tumor in deep tissues, and NaYF4 is used for upconversion luminescence (UCL) imaging. After being coated with hyaluronic acid (HA), the nanocomposites exhibit a time dependent cellular uptake and an excellent nucleus targeting effect in KB and MCF-7 cells. The ultrasound of HA–DCSNCs obviously enhances the apoptosis rate of MCF-7 cells. A greater tumor inhibition rate is observed when the tumor-bearing mice are treated with combined therapy (88.36%) compared with chemotherapy (28.36%) or sonodynamic therapy (38.91%) alone, indicating the potential of sonodynamic chemotherapy for cancer treatment.
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PubMed
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Chen Wang,Yilin Wu,Jian Lu,Juan Zhao,Jiuyun Cui,Xiuling Wu,Yongsheng Yan,Pengwei Huo
A bioinspired photocatalytic nanocomposite membrane was successfully prepared via polydopamine (pDA)-coated poly(vinylidene fluoride) (PVDF) membrane, as a secondary platform for vacuum-filtrated Au-TiO2 nanocomposites, with enhanced photocatalytic activity. The degradation efficiency of Au-TiO2/pDA/PVDF membranes reached 92% when exposed to visible light for 120 min, and the degradation efficiency of Au-TiO2/pDA/PVDF membranes increased by 26% compared to that of Au-TiO2 powder and increased by 51% compared to that of TiO2/pDA/PVDF nanocomposite membranes. The degradation efficiency remained about 90% after five cycle experiments, and the Au-TiO2/pDA/PVDF nanocomposite membranes showed good stability, regeneration performance, and easy recycling. The pDA coating not only served as a bioadhesion interface to improve the bonding force between the catalyst and the membrane substrate but also acted as a photosensitizer to broaden the wavelength response range of TiO2, and the structure of Au-TiO2/pDA/PVDF also improves the transfer rate of photogenerated electrons; the surface plasmon resonance effect of Au also played a positive role in improving the activity of the catalyst. Therefore, we believe that this study opens up a new strategy in preparing the bioinspired photocatalytic nanocomposite membrane for potential wastewater purification, catalysis, and as a membrane separation field.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2016
·
IF 1.207
Zhixian Huang,Yixiong Lin,Ling Li,Changshen Ye,Ting Qiu
The solid acid SO 4 2 − /TiO 2 was prepared by immersion method and applied for synthesis of propylene glycol methyl ether acetate (PMA) through esterification reaction of propylene glycol monomethyl ether (PM) and acetic acid (HAc). The optimal catalyst preparation condition was determined by orthogonal analysis of parameters in a five-factor and four-level test. The obtained solid acid catalysts were characterized in detail by means of X-ray powder diffraction, thermogravimetry, pyridine adsorbed IR analysis, scanning electron microscopy, and BET surface area method. Synthesis of PMA was studied in this paper through experimental investigation of reaction conditions such as temperature, molar ratio of reactants, catalyst dosage and agitation speed. Based on its possible reaction mechanism, a pseudo-homogeneous kinetic model was established and its activation energies E a + and E a − , 65.68 × 10 3 J·mol − 1 and 57.78 × 10 3 J·mol − 1 , were estimated. To prepare shaped solid acid catalyst SO 4 2 − /TiO 2 , the shaping method of impregnation–shaping–impregnation was applied. The optimal molding formulation of solid acid catalyst, obtained from the orthogonal test, was found to be binder 7 wt.%, reinforcing agent 20 wt.%, pore forming material 2.5 wt.%, and lubricant 4 wt.%. The results of performance test of catalyst demonstrated that the shaped solid acid catalyst exhibited high activity and stability.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3332-3340
·
IF 2.599
Ding Dong,Zhou Bo,Fu Wuyou,Lv Pin,Yao Huizhen,Liu Li,Wang Jun,Yang Haibin
Herein, we report an ionic cross-linkage process of synthesizing [001] preferred oriented anatase TiO 2 nanowires and nanotubes hybrid structure (TWTs) based on anodization method wherein varied amounts of TiF 6
2− ions are added in synthetic process. We show how the TiF 6
2− ions switch the growth direction of TWTs from [101] to [001] (denoted as T 101 WTs and T 001 WTs, respectively) and change their geometrical morphologies, i.e., small ionic radii TiF 6
2− ions migrate and partly replace the TiO 6
2− octahedra under electric field, which separate out and leave vacancies during annealing process, resulting in a reconstruction of TiO 2 . Importantly, absorption property and photoelectrochemical (PEC) performance of T 001 WTs exceed those of T 101 WTs. Furthermore, CdS QDs are assembled onto TWTs photoelectrodes by successive ionic layer adsorption and reaction technique. Likewise, T 001 WT/CdS presents superior absorption capability and enhanced PEC performance to those of T 101 WT/CdS. This could be attributed to their preponderances of improved light absorption capability and decreased electron recombination.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Xu Yan,Zipeng Xing,Yan Cao,Mengqiao Hu,Zhenzi Li,Xiaoyan Wu,Qi Zhu,Shilin Yang,Wei Zhou
In-situ C-N-S-tridoped single crystal black TiO 2 nanosheets with exposed {001} facets are successfully fabricated via a facile hydrothermal method combined with an in-situ solid-state chemical reduction approach, followed by calcination at 450 °C. The crystal structure, crystallinity, morphology and composition of the as-prepared samples are investigated through X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy, respectively. The results suggest that the obtained C-N-S-tridoped single crystal black TiO 2 nanosheets exhibit uniform nanosheet-like structure with exposed {001} facets and average length of ∼300–400 nm, thickness of ∼20 nm. The visible-light photocatalytic degradation rate of methyl orange is up to 92.13%, and photocatalytic hydrogen evolution is 149.7 μmol h −1 g −1 . The excellent photocatalytic activity can be ascribed to the synergetic effect of surface heterojunction between {001} and {101} facets, the C-N-S-tridoping, and the formed Ti 3+ species in photocatalyst, which can not only favor the visible-light absorption but also facilitate the separation and transfer of photogenerated charges.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fei Ye,Houfen Li,Hongtao Yu,Shuo Chen,Xie Quan
Protons tend to bond strongly with unsaturated-coordinate S element located at the edge of nano-MoS 2 and are consequently reduced to H 2 . Therefore, increasing the active S atoms quantity will be a feasible approach to enhance hydrogen evolution. Herein we developed a porous TiO 2 derived from metal organic frameworks (MOFs) as scaffold to restrict the growth and inhibit the aggregation of MoS 2 nanosheets. As a result, the thickness of the prepared MoS 2 nanosheets was less than 3 nm (1–4 layers), with more edges and active S atoms being exposed. This few-layer MoS 2 -porous TiO 2 exhibits a H 2 evolution rate of 897.5 μmol h −1 g −1 , which is nearly twice as much as free-stand MoS 2 nanosheets and twenty times more than physical mixture of MoS 2 with porous TiO 2 . The high performance is attributed to that more active edge sites in few-layer MoS 2 -porous TiO 2 are exposed than pure MoS 2. This work provides a new method to construct MOFs derived porous structures for controlling MoS 2 to expose active sites for HER.
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NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 4
·3225-3232
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IF 3.277
Han Zheng,Changhua Wang,Xintong Zhang,Lina Kong,Yingying Li,Yunyu Liu,Yichun Liu
Multi-heterojunctions are more promising than single-heterojunctions in photocatalysis due to the availability of more interfaces between each component. However, photocatalytic activity is highly dependent on the contact mode of individual components. In this work, we assemble TiO2–WO3–Pt multi-heterojunction microspheres using ultrasonic spray pyrolysis and focus on their contact mode governed photocatalytic activity. The results reveal that using highly crystalline WO3 nanosheets as building blocks could particularly enhance the photocatalytic activity of a TiO2/WO3 system toward the degradation of gaseous acetaldehyde and isopropyl alcohol. Furthermore, loading Pt nanoparticles onto WO3 nanosheets could facilitate a more prominent enhancement of activity than that of TiO2/Pt, benefiting from the two-electron reduction of oxygen at the interface of WO3/Pt. Meanwhile, the high crystallinity of WO3 nanosheets allows for a loading amount of Pt as low as 0.04 wt% in the TiO2–WO3–Pt system, which reduces the catalyst cost in comparison with that of the conventional amount of 1 wt%.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yan Li,Fang-Ting Liu,Yin Chang,Jian Wang,Cheng-Wei Wang
Structuring the materials in the form of photonic crystals is a new strategy for photocatalytic applications. Herein, a new concept of photonic crystal-induced p-n coaxial heterojunction film photocatalyst of Cu 3 SnS 4 /TiO 2 (CTS/PhC-TNAs) was well-designed and successfully fabricated by combining periodic pulse anodic oxidation and in-situ self-assembling methods Such nanostructured CTS/PhC-TNAs exhibited significantly improved photocatalytic degradation activity under simulated sunlight irradiation with methyl orange (MO) as the target pollutants. Within 120 min, 82% of the MO (10 mg/L) was photodegraded and its kinetic constant per specific surface area reached 0.05332 μmol/m 2 h, which is 1.6 and 12.8 times more quickly than that of PhC-TNAs and CTS, respectively. Its significantly enhanced photocatalytic activity could be mainly attributed to a joint effect of the unique photonic crystal property of PhC-TNAs and the nanostructured hollow p-n coaxial hetero-junction, which result in an increased efficiency of charge separation and transfer and also an improved spectral response capability. This photonic crystal film photocatalyst has the potential for enhancing the photocatalytic activity via further optimizing the photonic stop band of PhC-TNAs. The study presents a new means to design the kind of photonic crystal structural-induced novel photocatalysts with high photocatalytic activities in pollution treatment.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Nan Hao,Rong Hua,Saibo Chen,Ying Zhang,Zhou Zhou,Jing Qian,Qian Liu,Kun Wang
In this study, Ag/TiO 2 /3D nitrogen doped graphene hydrogel (3DNGH) was prepared for the first time and the photocurrent intensity of this material was greatly enhanced, which was attributed to the multiple enhancements accomplished in one step. The porous structure of 3DNGH could provide an exceptionally large accessible surface area, which was beneficial for the anchoring of Ag and TiO 2 nanoparticles . The introduction of nitrogen doped graphene and metal nanoparticles was capable to facilitate the charge separation efficiency and accelerate the transfer rate of the photogenerated electron-hole pairs. Then the photoelectrochemical performance was further amplified by the localized surface plasmon resonance of Ag nanoparticles. On the basis of excellent PEC properties of Ag/TiO 2 /3DNGH, a sensitive label-free PEC sensor has been established for the determination of thrombin successfully. This proposed PEC biosensor exhibited good PEC performances with a wide linear in the range from 0.01 p.M. to 10 p.M. as well as a relative low detection limit of 3 fM (S/N = 3), indicating that Ag/TiO 2 /3DNGH would serve as a promising photoactive material in the applications of PEC biosensors.
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高影响因子
APPLIED CLAY SCIENCE
·
2016
·
IF 2.586
Zhujian Huang,Pingxiao Wu,Beini Gong,Xing Zhang,Zicong Liao,Pen-Chi Chiang,Xinjiang Hu,Lihua Cui
To further enhance the photocatalytic properties of doped-TiO 2 , a series of (N, Cu) co-doped TiO 2 /rectorite composites with different amount of N doping were prepared for adsorption and catalytic oxidation of p -chlorophenol ( p -CP) under visible light. The physicochemical properties of the obtained composites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), etc. The results showed that the (N, Cu) co-doped TiO 2 catalyst was immobilized well onto rectorite , and the doping of N and Cu could affect the crystal structure of TiO 2 . The optimal N doping amount was determined by the photocatalytic degradation of p -CP in a stirred quartz reactor under visible light (> 420 nm) irradiation. It was found that the doping of N can improve significantly the degradation of p -CP and the optimum N doping amount is 1.0%. The adsorption of p -CP by the composites could accelerate the degradation rate of p -CP in situ. The photocatalytic activity of the (N, Cu) co-doped TiO 2 /rectorite composites remained stable after five cycles of photoreaction. A possible mechanism for the photocatalytic degradation of p -CP is proposed. Our work implied that rectorite has great potential to be applied in the field of photocatalysis .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
·
IF 3.205
Yuan-Hang Qin,Zi-Yao Xiong,Jiayu Ma,Li Yang,Zaikun Wu,Weiliang Feng,Tie-Lin Wang,Wei-Guo Wang,Cun-Wen Wang
TiO 2 -modified nitrogen-doped carbon (TiO 2 -NC), prepared by a polymerization-pyrolysis process, is used to support the Pd catalyst for ethanol oxidation reaction (EOR) in alkaline media . X-ray photoelectron spectroscopy characterization indicates that the incorporation of TiO 2 and nitrogen into the carbon matrix could improve the percentage of Pd 0 in Pd/TiO 2 -NC catalyst. Electrochemical characterization shows that the Pd/TiO 2 -NC catalyst presents higher electrocatalytic activity and stability for EOR than the nitrogen-doped carbon-supported Pd (Pd/NC) catalyst and the carbon black-supported Pd (Pd/CB) catalyst, which can be mainly attributed to the high percentage of Pd 0 in Pd/TiO 2 -NC catalyst (65%) than those in Pd/NC (48%) and Pd/CB (31%) catalysts. The results indicate that the Pd/TiO 2 -NC catalyst holds great potential as high-performance anode catalyst for direct ethanol fuel cells.
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POLYMER DEGRADATION AND STABILITY
·
2016
·
IF 3.12
Qingfeng Zhou,Yanfeng Liu,Gaobo Yu,Furui He,Kai Chen,Dunchao Xiao,Xinyu Zhao,Yuhong Feng,Jiacheng Li
Sono-photo-Fenton, sono-Fenton and photo-Fenton methods combined with heterogeneous TiO 2 nanoparticles are adopted to investigate the degradation of sodium alginate (NaAlg), and the kinetics mechanism is also explored. Experimental results suggest that the reaction order of NaAlg degradation ( n ) is 0.51 and the extent of photocatalytic degradation can increase with the loading of TiO 2 nanoparticles. Meanwhile, as the catalyst concentration increases from 0.05 to 0.5 gL −1 , the degradation rate constant ( k ) is decreased. In addition, the structure of degraded NaAlg is characterized by Fourier transform infrared (FT-IR), 1 H NMR spectroscopy, and X-ray diffraction analyses. The FT-IR and 1 H NMR spectra results indicate that the C2-C3 bond in the structure of NaAlg is broken and intra-molecular esters are formed during the degradation process due to the strong oxidization of the Fenton system. In general, the sono-photo-Fenton process with TiO 2 nanoparticles could provide an efficient way to degrade the NaAlg to low-molecular-weight.
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