D. Balkose et al., FLEXIBLE POLY(VINYL CHLORIDE)-ZEOLITE COMPOSITES FOR DYE ADSORPTION FROM AQUEOUS-SOLUTIONS, Separation science and technology, 31(9), 1996, pp. 1279-1289
Flexible poly(vinyl chloride) (PVC) composites having natural zeolite
clinoptillolite were prepared by plastisol-plastigel technology. Adsop
tion of methylene blue on each raw material and on composites was stud
ied both from an equilibrium and a rate approach. It was observed that
the adsorption capacity of zeolite decreased when it was embedded in
composites. The equilibrium uptake of methylene blue increased with an
increasing zeolite fraction in composites. Methylene blue was adsorbe
d from a 0.02 g . cm(-3) aqueous solution slowly, but was nearly adsor
bed completely with a composite having a 0.3 volume fraction of zeolit
e, The effective diffusion coefficient of methylene blue in composites
was of the order of 10(-13) m(2) . s(-1) and decreased with increasin
g filler fraction.