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Table of Content

    23 November 2005, Volume 23 Issue 6
    An Inclusion Complex of Squaraine/β-CD for Selective Cyanide Determination
    LI Chao, WANG Wei-bo, WANG Xue-song, ZHANG Bao-wen, CAO Yi
    2005, 23(6):  401-406.  DOI: 10.7517/j.issn.1674-0475.2005.06.401
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    Upon encapsulation in β-cyclodextrines(CDs),the solubility of the squaraine(SQ) in water was significantly altered.The "two arms" of the SQ were embedded in the cavities of two separate β-CDs,and the central four-member ring was left outside the cavities.The intense and sharp absorption of squaraines in the near IR and their highly selective decoloration induced by cyanide makes them suitable to serve as cyanide sensors.The inclusion ability of β-CD makes water-insoluble SQ applicable as molecular sensors of cyanide in water directly without chemical modification.
    Study on Photodynamic Effect of Silicon Naphthalocyanine Coordinated Compounds
    NIU Xiao-yu, ZHU Yu-jun, XUE Jin-ping, YU Hai-yan, WU Yi-qun, CHEN Nai-sheng, HUANG Jin-ling
    2005, 23(6):  407-413.  DOI: 10.7517/j.issn.1674-0475.2005.06.407
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    Excited state properties,generation of single-state oxygen and photo-oxidation of amino acid of axially coordinated silicon naphthalocyanine compounds have been investigated.The results indicate that the life of excited triplet state and generation of singlet state oxygen gradually reduce with increase of push electronic properties of axially coordinated groups for different silicon naphthalocyanine compounds.Reaction rate of photo-oxidation of amino acid is dependent on ability of generation of singlet state oxygen of different axially coordinated silicon naphthalocyanine compounds.Therefore,the first order rate constant of photosensitized oxidation of amino acids gradually reduce with increase of push electronic properties of axially coordinated groups.
    Preparation and Photocatalytic Property of ZnO Nanoparticles
    HAN Dong, REN Xiang-ling, CHEN Dong, TANG Fang-qiong, WANG Dong, REN Jun
    2005, 23(6):  414-420.  DOI: 10.7517/j.issn.1674-0475.2005.06.414
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    The ZnO nanoparticles have been made by precipitation method,and the hydroxypropylcellulose(HPC)was used as protective agent.TEM,XRD,UV-Vis and PL were used to characterize the ZnO nanoparticles.The forming mechanism of ZnO particles and the reaction effect factors were also discussed.Photodegradation of Rhodamine B in aqueous solution was investigated by using the ZnO particles as a photocatalyst.The results show that the ZnO particle is a good photocatalyst for degradation of dye solution.It will have potential applications in many areas such as environment protection.
    Preparation and Photocatalytic Activity of Nano-TiO2/Sepiolite Catalyst
    ZHANG Tian-yong, LI Bin, CHAI Yi, FEI Xue-ning
    2005, 23(6):  421-427.  DOI: 10.7517/j.issn.1674-0475.2005.06.421
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    A101/sepiolite catalyst was manufactured by directly mixing TiO2(A101) with sepiolite.The photocatalytic degradation of DEP(diethyl phthalate) in water was studied with sepiolite supported nanoscale TiO2 as catalyst.The results of experiments showed that the rate of photocatalytic degradation was affected by the amount of catalyst and the load of TiO2.For A101/sepiolite catalyst,the load of TiO2 has great effect on its photocatalytic activity and the rate of DEP's degradation,the carrier catalyst of 5% nanoTiO2 amounts showed the best photocatalytic activity.The morphography and crystal form of the supported catalyst was analyzed by x-ray diffraction(XRD) and scanning electronic microscope(SEM).
    Picosecond Ultrafast Kinetic Study of Dyes Sensitized Silver Bromine Microcrystals
    YANG Shao-peng, FAN Guo-zhi, Cao Ning, LI Xiao-wei, HAN Li, FU Guang-sheng
    2005, 23(6):  428-434.  DOI: 10.7517/j.issn.1674-0475.2005.06.428
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    On the basis of Streak Camera technique,fluorescence spectroscopy of three kinds of dyes J-aggregate adsorbed on cubic AgBr microcrystals was detected in time resolve 5 ps.The dependence of ultrafast electron transfer from dye J-aggregate to conduction band of AgBr on different dyes with different concentration was analyzed.And the micro mechanism of sensitization was also analyzed.It is showed that the dynamic decay curves can be fitted well by a double-exponential function.The fitting curves are consisted of a fast component and a slow one.Because of the large amplitude of the fast component,the fast decay should be mainly attributable to the electron transfer from J-aggregate of dye to conduction band of AgBr.The photo-induced electron transfer rate and the sensitization efficiency show certain change tendency with the change of dye concentration.As the dye concentration increasing,the sensitization efficiency decreases.
    Quantum-Chemical Analyses about the Hole-Transmission Properties of Three Diamine Molecules
    SHEN Hai-jun, FU Guang-ju
    2005, 23(6):  435-440.  DOI: 10.7517/j.issn.1674-0475.2005.06.435
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    With the uncharged and charged diamine molecules of TPD,TTB and NPB as the investigated objects,PM3 semi-empirical quantum chemistry and DFT calculations were performed to obtain the geometric configuration,energy,HOMO and LUMO energy-levels,net charge distribution,and dipole moment.According to the obtained results,hole-transmission properties of three molecules were compared and analyzed.It is shown that,of the three molecules,NPB has the most excellent hole-transmission capability,and,all the three molecules have high hole-transmission rate in the locations of their N-atoms.
    Study on the Synthesis and Photochromism of the 1-Chloro-2-Hydroxyl-4-Phenoxy-9,10-Anthraquinone
    HU Shi-rong, MENG Fan-yan, LENG Feng-shou
    2005, 23(6):  441-446.  DOI: 10.7517/j.issn.1674-0475.2005.06.441
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    The synthesis and photochromism of 4-chloro-2-hydroxyl-1-phenoxy-9,10-anthraquinone have been studied.The structures of the compound was determined by Elemental analysis,1H-NMR,13C-NMR,MS and IR spectrum.The photochromism was determined by UV-Vis spectrum,and the photochromism by the different structures of compounds was discussed.
    Gd3(1-x)Al5O12:RE3X Phosphors Material Chip's Synthesis and Luminescent Properties
    LUO Lan, LIU Qing-feng, LIU Qian
    2005, 23(6):  447-452.  DOI: 10.7517/j.issn.1674-0475.2005.06.447
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    The quaternary discrete combinatorial material chip approach was used to optimize new phosphors Gd3(1-x)Al5O12:RE3X.And we got the activator-and-sensitizer-screening results from Gd3Al5O12-matrix phosphors material chip as follows: 1) Gd3(1-x)Al5O3:Eu3x showed red photoluminescence;2) when Pr or Ce was co-doped(n(Pr):n(Eu)<1:10,n(Ce):n(Eu)<1:10),it would decrease the phosphor's luminescence intensity.Spectrum analysis showed that there was resonant energy transfer between Eu and RE by the absorbing or emitting low energy phonons while the Pr or Ce energy level was adding.And this was the main reason for Gd3Al5O12: Eu luminescence intensity decreasing.The material chip screening result was also verified by the powder samples,which were produced by nitric-citric process.The experimental work proved the combinatorial material chip approach is an efficient innovation for material research.
    Preparation and Properties of Yb Doped TiO2 Photocatalysts
    LI Hui-quan, CHEN Wei-fan, MA Ji-long, CUI Yu-min
    2005, 23(6):  453-459.  DOI: 10.7517/j.issn.1674-0475.2005.06.453
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    Yb/Ti samples were prepared by sol-gel process and characterized by means of XRD and BET.After doped with Yb,the particle diameter of catalyst was decreased,the specific surface area was increased,the formation rate of hydroxyl radical on the catalyst was increased,and the catalytic activity was improved.Using phenol as the model compound of the photocatalytic degradation reaction,the activity of the prepared photocatalysts was investigated in suspension irradiated by high-pressure mercury lamp.The hydroxyl radical produced in the supernatant of the irradiated catalyst suspension containing terephthalic acid were also investigated by measuring the fluorescence derived by the reaction with terephthalic acid.As the result showed,the addition of Yb to TiO2 notably enhanced its photocatalytic activity.The adsorption constants of phenol on the Yb doped catalysts and the nonmodified TiO2 catalyst were evaluated,and the result showed the adsorption of phenol on the Yb/Ti catalysts was improved.The optimum loading amount of Yb ion is 0.8%(molar ratio).
    Study on Photocatalytic Reduction Hg2+ by TiO2 Film
    YANG Li, WU Guang-hui, ZHOU Wei, SHI Wu-long
    2005, 23(6):  460-466.  DOI: 10.7517/j.issn.1674-0475.2005.06.460
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    TiO2、SO42-/TiO2、CdS/TiO2 film photocatalysts were prepared by sol method.The optimum experimental conditions for photocatalytic reduction Hg2+ using TiO2 film and the photocatalytic activity comparision among SO42-/TiO2,CdS/TiO2,and TiO2 film,between TiO2 powder and film were investigated.The results were as follows: the best reduction efficiency of Hg2+ was obtained under UV irradiation for 30 min at pH=5.34,the photoreduced mass of Hg2+ was more lower with the Hg2+ initial concentration increasing,the reduction efficiency was promoted under shorter wavelength,the reduction efficiency reached 100% after 30 min at the additon of methanol=15%(v/v),the photocatalytic activity of CdS-modified film was higher than that of unmodified film,the photocatalytic activity of CdS/TiO2 film was better than that of powder.