Abstract: Layers of aligned dyes are key to photo-driven charge separation in dye sensitized solar cells, but cannot be exploited as rectifying membranes in photocatalysis to sep. half-cells because they are not sufficiently stable. While impressive work on the fabrication of stable noncovalent membranes has been recently demonstrated, these membranes are inherently suffering from non-uniform orientation of the constituting dyes. To stabilize layers made from uniformly assembled and aligned dyes, they can be covalently cross-linked via functional groups or via chromophores at the expense of their optical properties. Here stable membranes from established dyes are reported that do not need to be elaborately functionalized nor do their chromophores need to be destroyed. These membranes are free-standing, although being only non-covalently linked. To enable uniform dye-alignment, Langmuir layers made from linear, water-insoluble dyes are used. That water-soluble charge transfer dyes adsorb onto and intercalate into the Langmuir layer from the aqueous subphase, thus yielding free-standing, molecularly thin membranes are demonstrated. The developed bifacial layers consist almost entirely of π-conjugated units and thus can conduct charges and can be further engineered for optoelectronic and photocatalytic applications.
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With 0.4percent Pt/Ti-Na-mordenit; In water; at 25.0℃; for 1.0h;pH Ca. 7;UV-irradiation;Catalytic behavior; Kinetics;
The application of synthesized nanocomposite for the photodegradation of pureDB53 dye was investigated under visible light. The experiments were carried outusing a horizontal cylinder annular batch reactor. The photocatalyst was irradiatedwith a blue fluorescent lamp (150 W) doubly covered with a UV cut filter. Theintensity data of UV light is confirmed to be under the detection limit (0.1 mW/cm2) of a UV radiometer. In a typical experiment, weight of catalyst were suspendedinto a 300-ml, 100 mg/L pure DB53 dye solution (pH 7). The reaction was carriedout isothermally at 25 C and samples of the reaction mixture were taken at differentintervals for a total reaction time of 1 h.The concentration of the unreacted DB53 dye was analyzed with UV JASCO (V570). The removal % of DB53 dye was measured by applying the following equation.% Removal efficiency ? dhCo CTh=Co 100 dh1Thwhere Co is the initial concentration of DB53 in solution, C is the remaining concentrationin solution after reactionBefore all photocatalytic runs, a fresh solution (300 ml) of DB53 were adjustedto required pH, and the catalyst was suspended. Suspensions were kept in dark andmagnetically stirred at 25 C for 60 min. The results indicate that adsorption efficiencywas about 18-20%.
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