Photodegradation of Some Dyes Over Ce/FSM-16 Catalyst Under Solar Light
ABSTRACT Ce doped FSM-16 (Ce/FSM-16) was synthesized by templating method and its photoactivity for the degradation of methyl violet,
safranine T, fuchsin basic and methylthionine chloride under solar light was studied for the first time. Ce/FSM-16 had very
high surface area (863m2g−1) and pore volume (0.73cm3g−1). Doping cerium ions appears important in bringing about sunlight photocatalytic activity. The photoactivity of Ce/FSM-16
is comparable with that of Degussa P25 under solar light. By contrast, undoped FSM-16 exhibited very strong adsorption capacity
for these dyes, but did not exhibit significant photoactivity for them. The degradation of dyes catalyzed by Ce/FSM-16 under
solar light followed a radical-type mechanism.
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ABSTRACT: Non-surfactant hypocrellins (Hys) is a kind of photosensitizer with strong and broad absorption in visible light region, obtained by isolating from the fungus sacs of hypocrella bambusae. Previous studies have not yet addressed the use of hypocrellins as non-surfactant template in the synthesis of photocatalyst CdS, let alone the achievement of higher efficient photocatalytic activity than Degussa P25. Herein Al doped CdS prepared by using hypocrellins as template (Al-CdS/Hys) can enhance the photocatalytic activity while Al doped CdS without template (Al-CdS) prepared by conventional solvothermal method reduced the photocatalytic activity. Al-CdS/Hys was synthesized and characterized by a combination of various physicochemical techniques, such as XRD, nitrogen adsorption/desorption, diffuse reflectance UV–vis and TEM. Al-CdS/Hys is even more efficient than Degussa P25 for the degradation of organic dye, basic fuchsin under artificial solar irradiation. Moreover, doping Al increased the surface area of CdS to169.1 m2 g–1.Procedia Environmental Sciences. 01/2013; 18:572–578.
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ABSTRACT: Although photosensitization of titania by organic dyes is one of the conventional ways for visible-light utilization of titania, previous studies have not yet addressed the use of dyes as templates in the synthesis of mesoporous materials, let alone the simultaneous achievement of highly crystalline mesoscopic ordering and visible-light photocatalytic activity. In this work, fourteen commercial synthetic dyes were directly used as structure-directing agents which convert to carbonaceous materials after 400 °C calcination in synthesis of thermally stable mesostructured titania. This in situ carbon enhanced the visible light photocatalytic activities for the degradation of aqueous dyes. The synthesized mesoporous titania samples were characterized by a combination of various physicochemical techniques, such as XRD, SEM, HRTEM, nitrogenadsorption/desorption, TGA–DSC, XPS, diffuse reflectance UV–vis and FT–IR. Most of prepared mesoporous titania photocatalysts exhibited better activity under outside solar light than under artificial UV light, due to the presence of carbonaceous species which were transferred from the dye templates. The reported strategies combine sol-gel chemistry and self-assembly routes directly using dye templates that tune the material's architecture, texture and particularly function, visible-light photocatalysis.Journal of Materials Chemistry 01/2009; 19(36). · 6.63 Impact Factor
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ABSTRACT: In the present investigation, we have reported the fabrication of a low-cost, magnetically separable, solar light active NiFe2–xNdxO4 photocatalyst with different neodymium contents. The synthesized photocatalyst samples were characterized by a combination of various physicochemical techniques such as PXRD, SEM, EDS, FTIR, and UV–vis spectroscopy. It was observed that Nd substitution can greatly enhance absorption in the whole visible region. With an increase in Nd concentration, NiFe2–xNdxO4 samples show a red shift in absorption. Interestingly, Nd substitution into nickel ferrite results in a dramatic conversion of the inert NiFe2O4 into a highly solar light active photocatalyst for the degradation of organic pollutants and also shows excellent recyclability and durability properties. The significant enhancement in photoactivity under solar light irradiation can be ascribed to the reduction of the nickel ferrite band gap by Nd3+ substitution. Therefore, these unusual properties of NiFe2–xNdxO4 encourage us to extend photocatalytic degradation to another few organic pollutants. This new photocatalyst system, NiFe2–xNdxO4, can have other potential environmental and energy applications that only need visible light as energy input.ACS Sustainable Chemistry & Engineering. 07/2013; 1(9):1143–1153.