Method and apparatus for optimizing control of an immobilized fi

Details Method and apparatus for optimizing control of an immobilized fi Method and apparatus for optimizing control of an immobilized fi

1995-04-04

1996-02-27

Walsh, Donald P.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

With means applying electromagnetic wave energy or...

422906, 422186, B01J 1912

Patent

active

054946433

ABSTRACT:
In a photocatalysis system for degrading toxic compounds to constituent components, an improved photoreactor system optimizes reaction rates on the surface of a wide bandgap semiconductor electrode material. The semiconductor material has a first surface exposed to light having a higher energy than the bandgap and a second surface exposed to the toxic compound. An electrical conductor contacts the semiconductor electrode material in a geometry effective to produce an electric field within the semiconductor material. A controlled voltage source is connected to the electrical conductor for applying a voltage bias effective to produce the electric field. A closed circuit current sensor or an open circuit voltage sensor is connected to the electrical conductor and outputs a current or voltage signal, respectively, that is indicative of an excess electrical charge in the semiconductor material. A processor monitors the current or the voltage signal and controls the voltage source to minimize the excess electrical charge.

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K. Vinodgopai et al., "Electrochemically Assisted Photocatalysis. TiO.sub.2 Particulate Film Electrodes for Photocatalytic Degradation of 4-Chlorophenol," 97 J. Phys, Chem. pp. 9040-9044 (1993).

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