Table of Content

23 July 2004, Volume 22 Issue 4

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Fe³⁺,Cr³⁺-doped TiO₂ Photocatalysts Preparedby the Sol-Gel and Hydrothermal Method

ZHU Jie-fang, FU Wen, HE Bin, ZHANG Jin-long

2004, 22(4):  241-243.  DOI: 10.7517/j.issn.1674-0475.2004.04.241

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Fe³⁺,Cr³⁺-doped anatase nanosized TiO₂ photocatalysts have been prepared by combining sol-gel method with hydrothermal treatment.The samples were characterized by XRD,BET,TEM,EPR and UV-Vis diffuse reflectance spectra(DRS).For the liquid phase photocatalytic decolorization of XRG,the photoactivity of TiO₂ doped with appropriate content of Fe³⁺or Cr³⁺exceeded those of non-doped TiO₂ and P25(Degussa)under visible light irradiation,meanwhile their photoactivity under UV excitation was not reduced by doping.

In-situ Synthesis of P25-MPTMS-CdS by Reverse Micellar Method and Study on Their Photochemical Properties

ZHU Yi-ping, ZHANG Jin-long

2004, 22(4):  244-250.  DOI: 10.7517/j.issn.1674-0475.2004.04.244

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CdS nanocrystallites prepared in reverse micellar systems were immobilized onto P25 particles which had been modified by 3-mercaptopropyltrimethoxysilane(MPTMS).The resulting P25-MPTMS-CdS particles were characterized by UV-Vis spectra and TEM.Their photocatalytic activity for the degradation of methyl orange dye was investigated.The results indicate P25-MPTMS-CdS photocatalysts have high photocatalytic activities both within UV and visible range.After 18 h of photoirradiation(λ>400 nm),the UV-Vis spectra show that CdS nanoparticles are well resist to photoirradiation,and have good photostability.

Assemblage of Ordered Nanogolds

ZHOU Xue-hua, LIU Chun-yan, ZHANG Zhi-ying, JIANG Long, LI Jin-ru

2004, 22(4):  251-258.  DOI: 10.7517/j.issn.1674-0475.2004.04.251

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Octadecylamine coated-nanogolds formed a three-dimensional ordered structure by LB technique.This was a new method to construct three-dimensional ordered aggregates.In order to enlarge the usage of the method,during the construction,organic small molecule,1-phenys-5-mecaptotetrazole was assembled into the interlayers,a new multilayer was formed.The two multilayers had ordered particles both on planes and in layer by layer,which were confirmed by TEM images and small-angle X-ray diffraction measurement.

The Photochemical Reaction of Bis(Naphthalene-Thiouronium Salts) Compound

ZHOU Li-li, ZHANG Xiao-hong, WU Shi-kang

2004, 22(4):  259-265.  DOI: 10.7517/j.issn.1674-0475.2004.04.259

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A kind of bis(naphthalene-thiouronium salt) is synthesized.The photo-chemical and physical behaviors of this compound were studied carefully.Under photo-irradiation compound exhibits unusual excimer emission in fluorescence spectrum.It is probable due to the intra-molecular photo-induced electron transfer occurred,and followed by radical formation,recombination reaction of radicals and cyclic compound formation.In this case the naphthalene groups contained will be arranged in an optimized condition for the excimer formation.In order to clarify the mechanism discussed above several methods such as the ESR measurement,the stable radical(such as TEMPO) and β-CD addition were designed and carried out for inhibition of the radical recombination reaction occurred.

Preparation and Photocatalytic Activity of Zn-TiO₂/AC Catalysts

WU Zun-yi, DU Yu-kou, HUA Nan-ping, SHEN Ming, YANG Ping

2004, 22(4):  266-271.  DOI: 10.7517/j.issn.1674-0475.2004.04.266

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The supported photocatalyst TiO₂/AC doping with Zn²⁺ was prepared by means of vacuum absorption-hydrolysis method.The catalyst was characterized by XRD and TEM.The photocatalytic activity of samples was evaluated by the photodegradation of Cl₃CCOOH.The result shows that the photocatalytic activities were significantly increased when the supported catalyst was doped with Zn²⁺ at optimal concentration (0.5 at.%).The highest photodegradation activity Cl₃CCOOH can be reached under condition of Zn-TiO₂/AC catalyst treated at 400 ℃ for 2 hours and pH=6 for the reaction solution.

Preparation of CdS-Inserted Nanotubed Titanic Acid and Its Photocatalytic Property

FENG Cai-xia, JIN Zhen-sheng, YANG Jian-jun, WANG Xiao-dong, LI Yu-hao, ZHANG Zhi-jun, ZHAO Jin-cai

2004, 22(4):  272-276.  DOI: 10.7517/j.issn.1674-0475.2004.04.272

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CdS-inserted nanotubed titanic acid was prepared and characterized with TEM, XRD and DRS. The photocatalytic property was evaluated by the photooxidation reaction of propylene. The results indicate that CdS-inserted nanotubed titanic acid has the similar photocatalytic activities with that of nanotubed titanic acid.

Reaction Kinetics of Photoinduced Bulk Polymerization of 4-Acrylamido-2,2,6,6-Tetramethyl-Piperidine in Melting State

LIU Xiao-xuan, DENG Xiang-hua, GUO Xu, REN Ya’e, WU Guang-guo

2004, 22(4):  277-286.  DOI: 10.7517/j.issn.1674-0475.2004.04.277

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4-acrylamido-2,2,6,6-tetramethyl-piperidine(AATP),a water soluble r-HALS,is synthesized and the structure and composition of AATP is characterized by FT-IR,¹H-NMR and elemental analysis.The reaction kinetics of photoinduced bulk polymerization of AATP in melting state is studied by using photo-DSC (DPC) technique.The results show that the conversion and the rate of AATP photopolymerization are obviously affected by the reaction condition such as temperature,incident light intensity and concentration of photoinitiator etc.Darocur 1173 is the available initiator and the optimum mass fraction of Darocur 1173 is 0.5—1.0 %.The rate of AATP photopolymerization is proportional to the square root of photoinitiator concentration c_PI^0.5 and incident light intensity I₀^0.5 respectively under given condition.The kinetic parameters of photoinduced bulk polymerization for AATP were measured at the steady and non-steady state.The rate constants for termination k_t is much larger than that for propagation k_p(k_p/k_t=3.43—33.57).k_t and k_t is increased with the conversion increasing in the reaction system.k_p and k_t is 2.22—7.96×10² and 0.08—2.67×10⁴(L/mol·s) corresponding to a conversion from 4.00% to 15.68%,respectively.These values are within the range of corresponding parameters typical for a free radical polymerization.The induction period of the reaction system is decreased with the increment of photoinitiator concentration and incident light intensity respectively.Because of apparent activation energy of the reaction system is negative[E_p-E_t/2 is from -7.70 to -13.36 kJ/mol] and A_p/A_t^0.5 is from 0.076 to 0.333(L/mol·s)^0.5,the rate of AATP photopolymerization is decreased with increment of the temperature from 110 ℃ to 150 ℃ and the irradiating time of that is prolonged.

Preparation and Properties of Quick UV-Curing Dendritic Acrylate Oligomer

XU Dong-mei, ZHANG Ke-da, NING Chun-hua, ZHU Xiu-lin

2004, 22(4):  287-292.  DOI: 10.7517/j.issn.1674-0475.2004.04.287

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Dendritic acrylate oligomer with multiple acrylate double bond (DAO) was synthesized by Michael addition reaction of ethylene diamine (EDA) and trimethylolpropane triacrylate (TMPTA) at 30 ℃ for 6 hours,using methanol as catalyst.Compared with traditional linear acrylate oligomers with similar molecule weight,DAO had lower viscosity and higher curing speed when used as UV curable resin,as well as the cured products had high hardness and good solvent resistance.

Microwave-Assisted and Phase Transfer Catalysis Synthesis of Tris(2-Cyanoethyl)Amine

NIE Guo-chao

2004, 22(4):  293-297.  DOI: 10.7517/j.issn.1674-0475.2004.04.293

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The technology of combining microwave irradiation with phase transfer catalysis was applied to organic synthesis.The intermediate of a ligand tris(2-cyanoethyl)amine was synthesized by the reactions of ammonia water and acrylonitrile in the pressure termetic pot under microwave irradiation.The reaction was completed in 61.2%(weight) yield,and the reaction time was 8 times shorter than the traditional method.The reaction was 67.2%(weight) yield,and the time was shortened by 90 times under microwave irradiation.The product was characterized by elemental analysis,IR,¹H-NMR,ES-MS,and TG-DTA.

Photodegradation of Dissolved Organic Matterand Its Impact on the Biologic Processes

WANG Xue-jun, LOU Tao

2004, 22(4):  298-305.  DOI: 10.7517/j.issn.1674-0475.2004.04.298

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Dissolved organic matter (DOM) plays an important role on regulating the chemical,biological and physical characteristics of marine and freshwater ecosystems.Photodegradation of DOM results in reduction of dissolved organic carbon (DOC),average molecular weights,changes in water optical properties and in the production of complex mixture of reactive oxygen species and carbon photoproducts.The photoproducts mainly are inorganic compounds(e.g.carbon monoxide,carbon dioxide and other dissolved inorganic carbon (DIC))that represent direct photochemical mineralization of the DOM,other photoproducts are low molecular weight organic molecules,amino acids and carbon disulphide and carbonyl sulphide,which have a great impact on the biological processes.

Relation Between DAR Coupler’s Structure and Property

LIU Yu-ting, , LÜ Feng, ZOU Jing, ZHANG Da-de, YAO Zu-guang

2004, 22(4):  306-317.  DOI: 10.7517/j.issn.1674-0475.2004.04.306

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The relation of the structure of DAR coupler and it’s photographic property was reported by analysizing the structure of DAR coupler.The structure of DAR coupler can be represented by Cp-L-A.Cp is the coupler residue;L is the divalent linking group also is the adsorbing group;A is the development accelerating functional group.In this paper,conclusion were made:the Cp can make no effect apparently on photographic property when L and A are the same.The stronger of the development accelerating functional group,the better of the DAR coupler’s photographic property when Cp and L are the same.The stronger of the adsorbability of adsorbing group,the better of the DAR coupler’s photographic property when Cp and A are the same.