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Photoreactor with self-contained photocatalyst recapture

Patent ·
OSTI ID:1175164
A system for the continuous use and recapture of a catalyst in liquid, comprising: a generally vertical reactor having a reaction zone with generally downwardly flowing liquid, and a catalyst recovery chamber adjacent the reaction zone containing a catalyst consisting of buoyant particles. The liquid in the reaction zone flows downward at a rate which exceeds the speed of upward buoyant migration of catalyst particles in the liquid, whereby catalyst particles introduced into the liquid in the reaction zone are drawn downward with the liquid. A slow flow velocity flotation chamber disposed below the reaction zone is configured to recapture the catalyst particles and allow them to float back into the catalyst recovery chamber for recycling into the reaction zone, rather than being swept downstream. A novel 3-dimensionally adjustable solar reflector directs light into the reaction zone to induce desired photocatalytic reactions within the liquid in the reaction zone.
Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC07-94ID13223;
Assignee:
Bechtel BWXT Idaho, LLC (Idaho Falls, ID)
Patent Number(s):
6,827,911
Application Number:
09/708,963
OSTI ID:
1175164
Country of Publication:
United States
Language:
English

References (8)

Heterogeneous photocatalysis: Degradation of dilute solutions of dichloromethane (CH2Cl2), chloroform (CHCl3), and carbon tetrachloride (CCl4) with illuminated TiO2 photocatalyst journal August 1983
AM1 simulated sunlight photoreduction and elimination of Hg(II) and CH3Hg(II) chloride salts from aqueous suspensions of titanium dioxide journal January 1987
Purification of water with near—u.v. illuminated suspensions of titanium dioxide journal May 1990
An investigation of titanium dioxide photocatalysis for the treatment of water contaminated with metals and organic chemicals journal September 1993
News: Titanium dioxide photocatalysis: Treatment hype or hope? journal June 1996
Collection optics of titanium dioxide photocatalyst on hollow glass microbeads floating on oil slicks journal April 1992
Chemical Oxidation Technologies: Ultraviolet Light/Hydrogen Peroxide, Fenton's Reagent, and Titanium Dioxide-Assisted Photocatalysis journal January 1993
Attachment of TiO2 Powders to Hollow Glass Microbeads: Activity of the TiO2 ‐ Coated Beads in the Photoassisted Oxidation of Ethanol to Acetaldehyde journal December 1991

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