ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The photocatalytic degradation of organics in aqueous solution is an active research field.Currently, the relatively low degradation efficiency is the key problem to be solved that caused bythe simple recombination of the photo-generated electrons and holes. The electrode was prepared byanodic oxidation on titanium thin plate and produced multiporous nano-crystalline titanium dioxidefilm with anatase structure on titanium substrate. In order to inhibit the simple recombination of theelectrons and holes, the electric potential bias was applied to the electrode to drive away thechargers. The change of the photocurrent and the discolouration of the dye solution containingeither methylene blue or acid red G with different magnitude of the applied bias were measured. Itshows that the photocurrent increased by three orders of magnitude from μA to mA level by theapplied bias. Correspondingly, the discolouration rate of the methylene blue in dye solution wasincreased greatly with the increasing applied bias up to 3.5V. The different kinds of transitionalmetal ions dopants of Mn2+, Cr3+, Fe3+, and Ni2+ to the electrodes was done by anodic oxidationmethod. The effects of different types of dopants on the photocatalytic activity were revealed bymeasuring the degradation of an organics aqueous solution containing a dye using a combination ofultraviolet light energy in the presence of these electrodes. The photocatalytic efficiency, which wasremarkably enhanced by the incorporation of Mn2+、 Cr3+.、 Mn2+, showed the largest enhancement.However, Fe3+ changed only slightly, and Ni2+ showed no enhancement. These effects were relatedto the difference of these transitional metal dopants electron work function values and also to thedifference of their ionic radii in respect to that of Ti4+. The configuration of the reactor for watertreatment with the rotating electrode and 365nm wavelength UV radiation was described
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2240.pdf
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