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Cheewita Suwanchawalit Sumpun Wongnawa Pimpaporn Sriprang Pachara Meanha 《Ceramics International》2012,38(6):5201-5207
A highly visible-light photocatalytic active Ag-modified TiO2 (Ag–TiO2) was prepared by a simple sol–gel process using TiOSO4 as the starting material, AgNO3 as a silver doping source, and hydrazine as a reducing agent. The prepared Ag–TiO2 samples were characterized by several techniques such as X-ray powder diffraction (XRD), BET surface area measurement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductively coupled plasma optical emission spectroscopy (ICP-OES), energy dispersive X-ray spectrometry (EDX), X-ray absorption spectroscopy (XAS) and UV–vis diffuse reflectance spectroscopy (DRS). The Ag–TiO2 photocatalyst, a mixture of amorphous and anatase phases, has a high surface area. The silver contents in the Ag–TiO2 samples were determined by ICP measurements. The diffused reflectance UV–vis spectra indicated that the Ag–TiO2 samples exhibited higher red shifts compared with the undoped TiO2 sample. Indigo carmine degradation under visible irradiation indicated that the Ag–TiO2 catalyst gave higher photocatalytic efficiency than those of commercial P25-TiO2 and undoped-TiO2 samples. The Ag–TiO2 catalyst can be reused many times without any additional treatment. 相似文献
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Pimpaporn?Paebumrung Amorn?Petsom Patchanita?ThamyongkitEmail author 《Journal of the American Oil Chemists' Society》2012,89(2):321-328
Novel bis(azo) dyes were successfully prepared from the coupling of either natural cardanol or its hydrogenated derivative
with a series of diazotized aromatic amines and diamines. These new dyes were fully characterized by NMR, infrared and UV–visible
spectroscopy and mass spectrometry. The dyes are highly soluble in a variety of common organic solvents and gasoline as a
consequence of the cardanol unit. The physical properties of gasoline according to American Society for Testing and Materials
standard were unaffected by the presence of the bis(azo) dye derived from 1-(4aminophenylazo)-2-naphthol at a concentration
of 6 ppm and the dye showed excellent stability over a 3 month period. 相似文献
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Nimit Sriprang Darunee Kaewchinda John D. Kennedy Steven J. Milne 《Journal of the American Ceramic Society》2000,83(8):1914-1920
A triol-based sol–gel system has been developed for the fabrication of thin films of lead zirconate titanate (PZT). Starting reagents were lead acetate, zirconium and titanium isopropoxides, acetylacetone, and 1,1,1-tris(hydroxymethyl)ethane (THOME), with 2-methoxyethanol (MOE) being used to dilute the sols for spin coating purposes. Preliminary characterization by NMR spectroscopy suggested that the gels consisted of the metal ions and bound THOME, acetylacetonate, and acetate residues, with some possible M–O–M bridges. Uncracked 0.4 μm single-layer PZT films of nominal composition PbZr0.53 Ti0.47 O3 were prepared on platinized substrates. Dielectric and ferroelectric properties were determined for samples made from sols containing 10 and 15 mol% excess lead acetate. Improved values were obtained for samples made from sols containing the higher excess; these exhibited a remanent polarization of 34 μC·cm−1 , a coercive field of 54 kV·cm−1 , and a relative permittivity of 1000. 相似文献
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Ike A Sriprang R Ono H Murooka Y Yamashita M 《Journal of Bioscience and Bioengineering》2008,105(6):642-648
Toxic metal contamination in agricultural fields is an important worldwide problem. In previous studies, we developed a bioremediation system based on the symbiosis between Astragalus sinicus and the recombinant rhizobium, Mesorhizobium huakuii subsp. rengei B3 developed by overexpressing a synthetic tetrameric metallothionein gene (MTL4) and cDNA encoding the phytochelatin synthase from Arabidopsis thaliana (AtPCS). To promote the transport of metals into the nodules of the rhizobium and the accumulation of metals, the iron-regulated transporter 1 gene from A. thaliana (AtIRT1) was introduced into recombinant strain B3 containing MTL4 or AtPCS in its chromosome. The fused AtIRT1-alkaline phosphatase was expressed in the free-living recombinant rhizobium and the nodule of A. sinicus. The recombinant strain B3 carrying AtIRT1 showed a higher Cd sensitivity and a higher amount of Cd accumulated in free-living culture than the wild-type strain B3. When the recombinant strain B3 established symbiosis with A. sinicus, the introduction of AtIRT1 in the recombinant strain B3 advantaged the accumulation of Cu and As in the nodules of A. sinicus, compared with that of Cd and Zn. 相似文献
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