NDLI: Photocatalytic reduction of hexavalent chromium (Cr(VI)) using rotating TiO$

Content Provider	Springer Nature Link
Author	Yoon, Jaekyung Shim, Eunjung Joo, Hyunku
Copyright Year	2009
Abstract	An immobilized TiO$_{2}$ electrode for photocatalytic hydrogen production is applied to reduce toxic Cr(VI) to non toxic Cr(III) in aqueous solution under UV irradiation. To overcome the limitation of powder TiO$_{2}$, a novel technique of immobilization based on anodization was applied and investigated under various experimental conditions. The anodization was performed with three different electrolytes (single or mixed), and then the anodized samples were annealed under an oxygen stream. Among the three kinds of anodized/annealed TiO$_{2}$ on Ti foil, Sample II (anodized at 20 V in 0.5% HF for 45 min at 5 °C, and annealed at 450 °C for 5 hr in ambient oxygen at a flow rate of 400 mL/min) was more effective for both Cr(VI) reduction than the other samples. Based on the electrolyte compositions, nanotubular TiO$_{2}$ grown on Ti meshes was fabricated for the purpose of its light-harvesting ability and efficiency, where the anodized/annealed TiO$_{2}$ on meshes were rotated in the center of the reactor and Cr(VI) could be effectively reduced at rotation speeds ranging from 0 to 64 rpm. In case of Sample II, it was found that up to 98 % of the Cr(VI) was reduced in 30 min at 64 rpm.
Starting Page	1296
Ending Page	1300
Page Count	5
File Format	PDF
ISSN	02561115
Journal	Korean Journal of Chemical Engineering
Volume Number	26
Issue Number	5
e-ISSN	19757220
Language	English
Publisher	Springer US
Publisher Date	2010-02-14
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cr(VI) Reduction Immobilized TiO$_{2}$ Anodization Rotating Mesh Type Reactor Biotechnology Materials Science Catalysis Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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