For binary adsorption system, several initial concentrations
of RR195 (10–250mgL−1) were prepared in 8 different glassstoppered
conical flasks with the presence of constant initial
concentration of 50mgL−1 of RB21 in each flask. Then, the experiment
was carried out following the steps as for single system
adsorption process. The remaining concentrations of both solutions
were also analyzed using UV–vis spectrophotometer through
the multi-component determination option. The experiments were
repeated for other constant initial concentrations of RB21, which
are 100 and 150mgL−1. The tests were repeated over again in order to study the adsorption behaviour of RB21 with the presence
of different constant initial concentrations of RR195 (50, 100
and 150mgL−1), as given in Table 1 .