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Bleaching examination of coloring matter

The photocatalyst performance of the GAEA processed artifical flower
*Methylene blue decolorzation test
Evaluate photocatalyst activity by observing
the decolorization of methylene blue

 Left-artificial flower
 Right-GAEA photocatalyst sprayed artificial      flower (area of one sheet approx. 25cm 2)

Evaluation conditions:
 ・Add 20ml (concentration 5 mg/L)
  of methylene blue solution and obsrved it      decolorizes
 ・Black light 20W×2
  (distance between a light and a sample is      approx. 5cm)

 About 4hours later, methylene blue of
 photocatalyst processed artificial flower was
 decolorized almost completely.
 Normal artificial flower was hardly changed
 from intial stage.

Result of GAEA internal test
[Formaldehyde deodorization test (figure below)]
 Same artificial flowers used by the methylene blue decolorization test,and empty one.
Evaluation conditions:
 Formaldehyde concentration of - 13 ppm, gas 1L
 Black light 20W×2 (distance to sample approx. 10cm ).
 4 hours later formaldehyde concentration
 of photocatalyst processed artificial flower became less than harf.
 Reduction of formaldehyde concentration in normal artificial flower is based on adsorption on cloth etc.
*Methylene blue decolorzation test
 is one of the method to evaluate oxidization decomposition photocatalyst.
photocatalyst's decomposition function is evaluated by oxidization decomposition of methylene bule
attached on titanium dioxide thin film after photo irradiation.
 There is nicotine of Cigarette as common adsorption substance for this test,
however it is no easy to attach nicotine on titanium dioxide thin file enqually therefore coloring
matter is used as a model substance of dirt.
 Methylene blue attached on the cloth is hardly changed by photo irradiation or methylene blue attached
on titanium dioxide is'nt changed at all without photo irradiation.
 However methylene blue attached on titanium dioxide is will be decomposed by catalyst rection
with photo irradiation and it will be decolorized.
We evaluate each dec-olorization staus by comparison and such evaluation enables us
to obtainb reproducible data.

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