The effects of contact time on the adsorption of human hair
were determined by batch adsorption experiments at varying
contact times of 5, 10, 20, 30 40, 60 and 80 min with all other
experimental variables kept constant. The effects of contact time
are illustrated in Fig.1. It can be seen that there was a rapid increase
in the sorption of the various oils in the first 5 min and after that,
proceeded at a slower rate and finally attained equilibrium before
the 60th minute. The initial high rate of oil sorption may be
attributed to the existence of bare active sites on the surfaces of