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.
"Photodegradation yield = where, C o is the initial concentration of basic fuchsin, C a is the concentration after photodegradation of dye, and C b is the decrease concentration because of the direct photolysis  . "
[Show abstract][Hide abstract] 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.
[Show abstract][Hide abstract] ABSTRACT: The electrochemical degradation of the triphenylmethane dye Methyl Violet (MV) in acidic and neutral aqueous solutions has been comparatively studied in an undivided electrolytic cell containing either a boron-doped diamond (BDD) or Pt anode and a stainless steel cathode under galvanostatic conditions. The dye solutions are completely decolorized and mineralized using BDD, but both processes become much slower when using Pt. The decolorization rate always follows a pseudo-first-order kinetic equation and increases with rising current density. The effect of pH, current density and MV concentration on the degradation rate, mineralization current efficiency and energy consumption with BDD is also examined. Generated carboxylic acids such as maleic, fumaric, tartronic, formic, oxalic and oxamic are detected and quantified by ion-exclusion HPLC. These compounds persist in the electrolyzed solution with BDD nearly up to the end of the mineralization process. The nitrogen of MV is mainly lost as ion, which is more rapidly released at the final degradation stages.
[Show abstract][Hide abstract] 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.
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