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Chinese Journal of Polymer Science 2000年第6期18卷 495-500页

作者：高放 Institute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China

o-Chloro-hexaarylbiimidazole (o-Cl-HABI) can be sensitized efficiently by the dyes 1-ethyl-3'-methyl thiacyanine bromide (C1), 3,3'-diethyl thiacarbocyanine iodide (C2), and cyclopentanone 2,5-bis[2-(1,3 -dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene] (C3) through electron transfer proceses. When exposed to a xenon lamp (filtered by Pyrex glass), the photosensitive systems composed of o-Cl-HABI and the above dyes can produce free radicals which initiate the polymerization of MMA. The photopolymerization kinetics equation was obtained for the o-Cl-HABI/C2 system, R-p = K [C2](0.75)[o-Cl-HABI](0.44)[MTA](0.12)[MMA](1.0). A comparison of the influence of different dyes on the conversion of MMA photopolymerization was conducted.

关键词： photolysis photopolymerization dye-sensitization o-chloro-hexaarylbiimidazole electron transfer

dye-sensitized TiO2@SBA-15 composites: Preparation and their application in photocatalytic desulfurization

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Green Energy & Environment 2020年第1期5卷 114-120页

作者： Guoqing Guo Haiyang Guo Feng Wang Liam John France Wanxin Yang Zhihong Mei Yinghao Yu School of Chemistry and Chemical Engineering South China University of Technology

Photocatalytic oxidation desulfurization has become a research hotspot in recent years because of mild reaction conditions, less energy consumption and high selectivity. In this paper, TiO2 was loaded onto SBA-15 molecular sieves and sensitized with organic dyes(2, 9-dichloroquinacridone, DCQ) to extend its spectral response range from ultraviolet light to visible light. The catalyst DCQ-X%TiO2@SBA-15 was characterized by BET measurements, X-ray diffraction, Fourier transform infrared spectroscopy and Ultraviolet-visible diffuse reflection spectra, and then it was applied for photocatalytic oxidation desulfurization of gasoline. The effects of different catalytic systems, TiO2 concentration, catalyst dosage, and different model sulfur compounds on catalytic desulfurization performance were investigated. Experimental results show that DCQ-TiO2@SBA-15 has a better performance than the unsensitized TiO2@SBA-15, and the desulfurization rate can reach up to 96.1% in a reaction time of 90 min.

关键词： TiO2 dye-sensitization Gasoline desulfurization Photocatalysis

dye-sensitized photo-oxidation of disulfiram

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Chinese Journal of Chemistry 1995年第5期13卷 464-467页

作者： CHOBISA C.S.BHARDWAJ Rajesh PUNJABI Pinki B.AMETA Suresh C. Department of Chemistry College of Science Sukhadia University Udaipur 313001 (Raj.) IndiaDepartment of Chemistry College of Science Sukhadia University Udaipur 313001 (Raj.) IndiaDepartment of Chemistry College of Science Sukhadia University Udaipur 313001 (Raj.) IndiaDepartment of Chemistry College of Science Sukhadia University Udaipur 313001 (Raj.) IndiaDepartment of Chemistry College of Science Sukhadia University Udaipur 313001 (Raj.) India

dye-sensitized photo-oxidation of disulfiram has been carried out under various reaction conditions including change in solvents and sensitizers. The product has been isolated and characterized by its physical, chemical and spectral data. To confirm the participation of singlet-oxygen in the reaction, the experiment has also been carried out in the presence of various singlet oxygen scavengers.

关键词： dye-sensitization photo-oxidation disulfiram

dye-SENSITIZED PHOTOPOLYMERIZATION OF METHYL METHACRYLATE INITIATED BY COUMARIN dye/IODONIUM SALT SYSTEM

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Chinese Journal of Polymer Science 1999年第6期17卷 589-594页

作者：高放 Institute of Photographic Chemistry The Chinese Academy of Sciences Beijing 100101 China

The photosensitive initiating system composed of 7-diethylamino-3-(2'-benzimidazolyl)coumarin dye (DEDC) and diphenyliodonium hexafluorophosphate (DIHP) which act as the sensitizer and the initiator respectively, can be used to initiate the polymerization of methyl methacrylate (MMA). The results showed that when exposed to visible light, coumarin dye/iodonium salt undergoes quick electron transfer from DEDC to DIHP and free radicals are produced. The visible light photoinduced reaction between DEDC and DIHP is mainly through the excited singlet state of DEDC and thus it is a little sensitive to O-2. The influence of concentration of DEDC, DIHP and MMA on the rate of photopolymerization of MMA was also investigated.

关键词： dye-sensitization photopolymerization electron transfer iodonium salt

para-Dialkylaminophenyl dyes for Efficient Nanocrystalline TiO2 sensitization in Far-red Region

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Chinese Journal of Chemistry 2006年第4期24卷 537-545页

作者：李超周家宏陈景荣陈友生张雪华丁慧颖王维波王雪松张宝文 Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100101 China Graduate School of Chinese Academy of Sciences Beijing 100039 China Jiangsu Engineering Research Center for Bio-medical Function Material Nanjing Normal University Nanjing Jiangsu 210097 China

Four para-dialkylaminophenyl （PDAAP1-PDAAP4） bearing carboxyl groups were studied for application to the dye-sensitized solar cells （DSC）. It was found the short spacer CH2 between carboxyl and dialkylaminophenyl chromophore in PDAAP3 and PDAAP4 led to highly efficient monochromatic incident photon-to-current conversion efficiencies （IPCE）, however the long alkyl group C4H9 attached on aniline moieties in PDAAP2 and PDAAP4 favored improvement of open-circuit photovoltage. Thus, the solar cell sensitized by PDAAP4, having both short carboxyl groups CH2COOH and long alkyl groups C4H9, exhibited the IPCE maximum of 73% at 670 nm and overall energy conversion efficiency η of 3.06%, representing the highest IPCE and η values so far in dialkylaminophenyl-based organic dye-sensitized semiconductor solar cells. Taking advantage of the highly efficient sensitizing ability of PDAAP4 in far-red region, the data of IPCE above 630 nm of the solar cells were improved greatly by cosensitization with both N3 and PDAAP4. The influences of the TiO2 film thickness and the concentration of 4-tert-butylpyridine （TBP） in electrolyte were also investigated.

关键词： dialkylamineophnenyl dye dye-sensitization solar cell efficiency

Photolysis of hexaarylbiimidazole sensitized by dyes and application in photopolymerization

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Chinese Journal of Chemistry 2000年第3期18卷 280-285页

作者：高放徐锦棋宋晓友李立东杨永源冯树京 Institute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China

Kinetic studies on the near-UV photo-initiating polymerization of methylmethacrylate (MMA) sensitized by dye/hexaarylbiimidazole systems were carried out. When exposed to high-pressure mercury lamp (filtered by Pyrex glass), dye/hexaarylbiimidazole system undergoes quick electron transfer and free radicals are produced. RSH, as hydrogen donor, can improve the polymerization efficiency of MMA. Comparisons of influence of different dyes and different RSH on the conversion of MMA photopolymerization were carried out. Excellent results have been obtained in photoimaging studies, e.g. a minimum exposure energy of the photosensitive systems of 8 mJ/cm2 can be reached and the resolution of presensitized printing plate was ca. 10 μm.

关键词： Hexaaryliimidazole dye-sensitization photopolymerization electron transfer

Investigation of photoelectron temporalcharacteristics in silver halide microcrystals using the microwave absorption technique

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Chinese Physics B 2004年第8期13卷 1326-1329页

作者：杨少鹏傅广生代秀红董国义李晓苇韩理 CollegeofPhysicsScience&Technology HebeiUniversityBaoding071002China

The free photoelectron lifetime reflects to a large extent the latent image formation efficiency and sensitivity of silver halide material. The microwave absorption dielectric-spectrum technique enables measurement of the photoelectrondecay process of silver halide emulsion exposed to 35ps laser pulse. For T-grain AgBr emulsion, the relationship between exciting energy and photoelectron action has been obtained, and the influence of iodide dopants on photoelectron lifetime was measured and analysed. The photoelectron lifetime of dye-sensitized AgBr emulsion with tabular grains is shorter than that with cubic grains, and the latent image formation efficiency of the former is higher than the latter.

关键词： silver halide emulsion photoelectron lifetime microwave absorption dye-sensitization

Evaluation of Reaction Mechanism for Photocatalytic Degradation of dye with Self-Sensitized TiO<sub>2</sub>under Visible Light Irradiation

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Open Journal of Inorganic Non 2017年第1期7卷 1-7页

作者： Md. Ashraful Islam Molla Ikki Tateishi Mai Furukawa Hideyuki Katsumata Tohru Suzuki Satoshi Kaneco Department of Chemistry for Materials Mie University Mie Japan Mie Global Environment Center for Education and Research Mie University Mie Japan

The dye-sensitized TiO2 method is one of the most promising methods for the visible-light-induced detoxification of pollutants. The reaction mechanism for photocatalytic degradation of orange II (OII) and rhodamine B (RhB) with self-sensitized TiO2 under visible light irradiation (λ > 400 nm) has been evaluated. Radical scavenger studies were carried out to investigate the active species involved in the photodegradation of 5 mg/L of initial concentration of OII and RhB at room temperature. The trapping effects of different scavengers results proved that the oxidation of OII and RhB mainly occurred by the direct oxidization of h+ and ·O2- radicals, while the ·OH radicals played only a relatively minor role in the direct oxidization process.

关键词： TiO2 Photocatalytic Degradation Visible Light dye-sensitization Reaction Mechanism