Colloid and Polymer Science

, Volume 269, Issue 1, pp 70–76 | Cite as

CPS GL 799

Effect of illumination on transport of sulfonated direct dyes into a cellulose membrane
  • M. Nango
  • M. Maekawa
  • K. Murakami
  • H. Yoshida
Colloid Science
Received:
Accepted:
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Abstract

The effect of illumination on transport of sulfonated bisazo direct dyes, CI Direct Yellow 12, and CI Direct Yellow 4, into a cellulose membrane has been studied at various temperatures. Transport of CI Direct Yellow 12, which exhibits photoinduced reversible trans-cis isomerism in aqueous solution into a cellulose membrane, was influenced by illumination. It is likely that the transport was influenced by transisomerization of the photoisomeric dye and the diffusivity was controlled by surface diffusion rather than by pore diffusion under both light and dark conditions.

Key words

Illuminationeffect adsorption diffusion cellulosemembrane directdye 

Notations

C

Concentration of dye in the pores (mol/dm3)

CE

Concentration of electrolyte in the bulk solution (mol/dm3)

Co

Concentration of dye in the bulk solution (mol/dm3)

Dp

Pore diffusivity (m2/s)

Ds

Surface diffusivity (m2/s)

[M]

Mean concentration of dye in membrane\(( = \int\limits_0^l {{{[M]_L d2} \mathord{\left/ {\vphantom {{[M]_L d2} l}} \right. \kern-\nulldelimiterspace} l})}\) (mol/dm3)

[M]L

Local concentration of dye in membrane (=q+ε p C) (mol/dm3)

[M′]

Mean concentration of dye in membrane\(( = \int\limits_0^l {{{[M']_L dz} \mathord{\left/ {\vphantom {{[M']_L dz} l}} \right. \kern-\nulldelimiterspace} l})}\) (mol/kg)

[M′]L

Local concentration of dye in membrane (=q′/V+ε p C) (mol/dm3)

F

Fractional attainment of equilibrium

l

Thickness of membrane (m)

q

Concentration of dye adsorbed on pore wall (mol/dm3)

qo

Adsorbed concentration of dye in equilibrium withC o (mol/dm3)

q′

Concentration of dye adsorbed on pore wall (mol/kg)

q′o

Adsorbed concentration of dye in equilibrium withC o (mol/kg)

t

Time (s)

V

Volume of membrane swollen with water per unit dry cellulose (dm3/kg)

x

C/C o

y

q/q o

z

Distance that the dye diffused in the membrane (m)

α

q o /ε o C o

β

αD s /D p

γ

Coefficient of the Freundlich isotherm

εp

Pore void fraction

ϱ

z/l

τp

D p t/l 2

τs

D s t/l 2

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References

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Copyright information

© Steinkopff-Verlag 1991

Authors and Affiliations

  • M. Nango
    • 1
  • M. Maekawa
    • 2
  • K. Murakami
    • 2
  • H. Yoshida
    • 3
  1. 1.Department of Applied ChemistryUniversity of Osaka PrefectureSakai, OsakaJapan
  2. 2.Department of Living ScienceNara Women's University NaraJapan
  3. 3.Department of Chemical EngineeringUniversity of Osaka PrefectureSakai, OsakaJapan

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