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ABSTRACT: A dual-phase material (DP-160) comprising hydrated titanate (H 2 Ti 3 O 7 . xH 2 O) and anatase (TiO 2) was synthesized in a low-temperature one-pot process in the presence of triethylamine (TEA) as the N-source. The unique structure exhibits strong visible light absorption. The chromophore is linked to Ti–N bonds derived from both surface sensitization and sub-surface (bulk) doping. From transmission electron microscope (TEM) and textural studies by N 2 physisorption, the composite exists as mesoporous particles with a grain size of 20 nm and mean pore diameter of 3.5 nm, responsible for the high surface area (180 m 2 /g). DP-160 demonstrated photocatalytic activity in the degradation of phenol under visible light (>420 nm). The activity of the composite was further enhanced by a small addition (0.001 M) of H 2 O 2 , which also gave rise to some visible light activity in the control samples. This effect is believed to be associated with the surface peroxo-titanate complex. GC–MS analyses showed that the intermediate products of phenol degradation induced by visible light irradiation of DP-160 did not differ from those obtained by UV (band-gap) irradiation of TiO 2 . The overall performance of the composite is attributed to efficient excitation via inter-band states (due to N-doping), surface sensitization, improved adsorptive properties of aromatic compounds due to the N-carbonaceous overlayer, and the presence of heterojunctions that are known to promote directional charge transfer in other mixed-phase titanias like Degussa P25.
Journal of Solid State Chemistry 08/2012; 196:518. · 2.16 Impact Factor
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ABSTRACT: A nanohybrid plasmonic photocatalyst, comprising Ag-AgX (X = Cl, Br, I) nanoparticles anchored on titanate nanotubes, was fabricated via a silver ion incorporation process followed by hydrogen halide injection and light-irradiation. The Ag-AgX-titanate nanotubes (Ag-AgX-TNT) hybrid with a high surface area could synergistically adsorb and degrade methylene blue (MB) under visible light, viz., the titanate nanotubes adsorb MB onto their surfaces, which aids the degradation of MB by Ag-AgX nanoparticles. The excellent degradation performance of Ag-AgX under visible light originated from its localized surface plasmonic resonance effect. Therefore, this integrated silver halides/titanate hybrid can efficiently degrade MB dye, and shows good potential for waste water treatment utilizing solar irradiation.
RSC Advance. 08/2012;
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Journal of Solid State Chemistry 06/2012; · 2.16 Impact Factor
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Journal of Materials Chemistry 04/2012; · 5.97 Impact Factor
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ABSTRACT: Nanohybrid plasmonic photocatalyst, which are composed of Ag-AgX (X = Cl, Br, I) nanoparticles anchored on titanate nanotubes, was fabricated via a silver ion incorporation process followed by hydrogen halide injection and light-irradiation. The Ag-AgX-titanate nanotubes (Ag-AgX-TNT) hybrid 10 with high surface area could synergistically adsorb and degrade methylene blue (MB) under visible light, viz., the titanate nanotubes adsorb MB onto their surfaces, which aids the degradation of MB by Ag-AgX nanoparticles. The excellent degradation performance of Ag-AgX under visible light originated from its localized surface plasmonic resonance effect. Therefore, this integrated silver halides/titanate hybrid can efficiently degrade MB dye, and shows good potential for waste water treatment utilizing solar 15 irradiation.
RSC Advances. 01/2012;
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ABSTRACT: Dense and uniform silver halides AgX (X = Cl, Br, I) nanoparticles were successfully fabricated on layered titanate nanowired honeycomb (TNHC) thin films. The growth of AgX nanocrystals was carried out through two steps. Firstly, ion-exchange was employed to incorporate Ag(+) ions into the interlayer of the titanate nanowires. Secondly, hydrogen halide (HX) solution was rapidly injected onto the ion-exchanged silver TNHC surface to generate nanosized AgX particles on TNHC films. The effect of the reaction time, solution pH, and concentration of halide anions on the morphology of the AgX photocatalysts has been studied. Followed by light-irradiation, the optimized Ag/AgX thin films exhibited excellent degradation performance under visible light because of localized surface plasmon resonance effect.
ACS Applied Materials & Interfaces 12/2011; 4(1):438-46. · 4.53 Impact Factor
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Yuekun Lai,
Yuxin Tang,
Jianying Huang,
Hui Wang,
Huaqiong Li, Dangguo Gong,
Xianbai Ji,
Jiaojiao Gong,
Zhong Chen,
Lan Sun,
Changjian Lin
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ABSTRACT: We present the preparation of millimetre-sized liquid marbles with strong mechanical strength and good deformability using self-assembled fluoroalkylsilane functionalized titanate nanobelt powder. The strength and deformability of the marbles are adjustable by changing the intrinsic wetting state of the titanate nanoparticles. The excellent chemical stability of surface layer on the liquid marbles consisting of the titanate nanobelts provides the possibility for qualitative and quantitative chemical sensing under a wide range of pH values.
Soft Matter 07/2011; · 4.39 Impact Factor
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Chemistry 02/2011; 17(9):2575-8. · 5.93 Impact Factor
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ABSTRACT: In this work, the one dimensional (1D) titanate nanotubes (TNT)/nanowires (TNW), bulk
titanate micro-particles (TMP), and three dimensional (3D) titanate microsphere particles (TMS) with high specific surface area were synthesized via different approaches. The chemical composition and structure of these products have been characterized by field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM) study and Raman scattering spectroscopy. The as-prepared TMS shows excellent adsorption performance compared with TMP, TNW and TNT when methylene blue (MB) and PbII ions are used as
representative organic and inorganic pollutants.
MRS Proceedings. 01/2011; 1309.
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ABSTRACT: The present paper describes an unconventional approach to fabricate superhydrophilicsuperhydrophobic template on the TiO2 nanotube structured film by a combination of electrochemical anodization and photocatalytic lithography. Based on template with extreme wetting contrast, various functional nanostructures micropattern with high resolution have been successfully fabricated. The resultant micropattern has been characterized with scanning electron microscopy, optical microscopy, X-ray photoelectron spectroscopy. It is shown that functional nanostructures can be selectively grown at superhydrophilic areas which are confined by the hydrophobic regions, indicating that the combined process of electrochemically self-assembly and photocatalytic lithography is a very promising approach for constructing well-defined templates for various functional materials growth.
MRS Proceedings. 01/2011; 1316.
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ABSTRACT: A facile anodic electrophoretic deposition (EPD) process has been developed to prepare thin uniform films consisting of titanate nanotubes (TNTs) that were synthesized by a hydrothermal approach. Such an EPD process offers easy control in the film thickness and the adhesion to the substrate was found to be strong. The chemical composition and structure of the products have been characterized by HRTEM, FESEM, XRD and TG/DTA. It was found that the functionalization of TNTs plays a key role on the electrolyte stability and the successful formation of a uniform TNT film with good adhesion. The as-prepared TNT films show exceptional superhydrophilic behavior with ultra-fast spreading, while it converts to superhydrophobicity yet with high adhesion after 1H,1H,2H,2H-perfluorooctyl-triethoxysilane modification. This study provides an interesting method to prepare films with extremely high wettability contrast that are useful for producing different kinds of functional materials.
Materials Research Society Symposium Proceedings. 01/2011; 1309.
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Chemistry 07/2010; 16(26):7704-8. · 5.93 Impact Factor
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ABSTRACT: A facile electrophoretic deposition (EPD) process has been developed to prepare thin films consisting of titanate nanotubes (TNTs) that were synthesized by a hydrothermal approach. Such an EPD process offers easy control in the film thickness and the adhesion to the substrate was found to be strong. The chemical composition and structure of the products have been characterized by XRD, HRTEM, and FESEM. It was found that the functionalization of TNTs plays a key role on the electrolyte stability and the formation of a uniform TNT film with good adhesion. The as-prepared TNT films show exceptional superhydrophilic behavior with ultra-fast spreading, while it converts to superhydrophobicity yet with strong adhesion after 1H,1H,2H,2H-perfluorooctyl-triethoxysilane modification. This study provides an interesting method to prepare films with extremely high wettability contrast that are useful for producing different types of functional materials.
Electrochemistry Communications 12/2009; 11(12):2268-2271.. · 4.86 Impact Factor
