Mixtures of synthetic organic dyes in a photoelectrochemical cell

Wróbel, Danuta; Boguta, Andrzej; Ion, Rodica‐Mariana

doi:10.1016/s1010-6030(00)00377-4

Cited by 123 publications

(45 citation statements)

References 20 publications

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“…4 C and D. In both cases the photovoltage increases when compared to the signals of porphyrins without dopa melanin. In the creation of photovoltage/photocurrent the electron injection mechanism is responsible as shown in the literature [22][23][24]. In the light of our results it is evidently seen that dopa melanin acts as a very good mediator in the electron injection from excited dye molecules to the PEC electrode.…”

Section: Resultssupporting

confidence: 73%

Photovoltage generation and fluorescence of charged tetraphenylporphyrins with dopa melanin

Hanyż

Wróbel²

2003

Cryst. Res. Technol.

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Positively charged tetra(4-N,N,N,N-trimethylanilinium) porphyrin (TAP) and negatively charged tetrakis(4-sulphonatophenyl) porphyrin (TPPS 4 ) and their mixtures with dopa melanin in polyvinyl alcohol have been investigated. On the basis of the absorption and fluorescence spectra it has been established the formation of TAP-dopa melanin complex which fluorescence is quenched whereas TPPS 4 fluorescence behaviour is only slightly changed in the presence of dopa melanin. Photovoltaic effects and photocurrent generation in a photoelectrochemical cell consisting of a layer dye solutions sandwiched between the semiconducting and gold electrodes have been investigated. The dependence of photovoltage signal on excitation wavelength (photovoltage action spectrum), kinetics of photocurrent rise and decay in the second time scale have been presented. Electric parameters of the photoelectrochemical cell (conductivity and capacitance) with porphyrin dyes, dopa melanin and their mixtures in the dark and upon illumination have been estimated. It was shown that all investigated dyes are able to generate photosignal but the values of photocurrent generated depend on the dye used in the experiment and the presence or absence of dopa melanin.

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Section: Resultssupporting

confidence: 73%

Photovoltage generation and fluorescence of charged tetraphenylporphyrins with dopa melanin

Hanyż

Wróbel²

2003

Cryst. Res. Technol.

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“…Synthetic dyes are widely used in textile industry ( Vandevivere et al 1998;Sakthivel et al 2003), leather industry (Sakthivel et al 2003;Tunay et al 1999), paper production (Vandevivere et al 1998;Ivanov et al 1996), food technology (Slampova et al 2001), medical (Haferlach et al 2008), agricultural research (Cook and Linden 1997;Kross et al 1996), light-harvesting arrays (Wagner and Lindsey 1996), photoelectrochemical cells (Wrobel et al 2001), etc.…”

Section: Introductionmentioning

confidence: 99%

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

2015

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Traditional chemical, physical and biological processes for treating wastewater containing textile dye have such disadvantages as high cost, high energy requirement and generation of secondary pollution during treatment process. The advanced oxidation processes technology has been attracting growing attention for the decomposition of organic dyes. Such processes are based on the light-enhanced generation of highly reactive hydroxyl radicals, which oxidize the organic matter in solution and convert it completely into water, CO 2 and inorganic compounds. In this presentation, the photocatalytic degradation of dyes in aqueous solution using TiO 2 as photocatalyst under solar and UV irradiation has been reviewed. It is observed that the degradation of dyes depends on several parameters such as pH, catalyst concentration, substrate concentration and the presence of oxidants. Reaction temperature and the intensity of light also affect the degradation of dyes. Particle size, BETsurface area and different mineral forms of TiO 2 also have influence on the degradation rate.

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“…In our papers [9,10] we have shown how the presence of central metal incorporated in the porphyrin ring and the type of central metal can influence the ability of the system for photocurrent/photovoltage generation. In the light of all our investigations done for a number of metallic, metal-free and substituted porphyrins [10,33] we could indicate that porphyrin complexed with Mg or Zn showed the highest effectiveness in photocurrent generation. The same trend is also observed in this paper when phthalocyanine was complexed with Mg. Another feature which markedly differs MgPc from other investigated Pcs is its very good solubility in PVA/DMSO As shown, the characteristics of the electrochemical cell fulfilled with dye-PVA/DMSO (this paper) and with dyeliquid crystal (LC) solutions [9,10] differ from each other and indicate that polymer matrices can influence the MgPc photocurrent generation by changing the internal electric fields most probably due to enhance the charge carrier dissociation [10,35].…”

Section: Discussionmentioning

confidence: 77%

Spectroscopic and photoelectric studies of phthalocyanines in polyvinyl alcohol for application in solar energy conversion

Wróbel

Boguta

Ion³

2000

International Journal of Photoenergy

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Abstract. Phthalocyanines are synthetic dyes which are shown to be good photoconverters which can be applied in a photoelectrochemical cell constructed of semiconducting and metallic electrodes. By means of spectroscopic investigation (absorption, fluorescence and photoacoustics) we have followed spectral properties of phthalocyanines complexed with metals dissolved in polyvinyl alcohol solution in order to determine the pathways of deactivation of their excited states. Spectroscopic investigations were accompanied with photovoltaic/photocurrent and current-voltage characteristics of the photoelectrochemical cell with dyes. It has been shown that there is a correlation between dye fluorescence feature and dye ability to electric photoconversion. The comparison of new data for metallic phthalocyanines with those obtained for porphyrins is discussed.

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Mixtures of synthetic organic dyes in a photoelectrochemical cell

Cited by 123 publications

References 20 publications

Photovoltage generation and fluorescence of charged tetraphenylporphyrins with dopa melanin

Photovoltage generation and fluorescence of charged tetraphenylporphyrins with dopa melanin

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

Spectroscopic and photoelectric studies of phthalocyanines in polyvinyl alcohol for application in solar energy conversion

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