C-4-phenacyloxy phenyl calix[4]resorcinarene (CPPCR) was synthesized by acidic condensation of 4-hydroxybenzaldehyde
and resorcinol. The adsorption of CPPCR for Pb(II), Cd(II) and Cr(III) has been studied by measuring the metal
concentration in aqueous solution using Atomic Absorption Spectrophotometry (AAS). The effects of solution pH, contact
time and initial concentration of metal ions on the adsorption capacity of CPPCR were investigated. The adsorption kinetic
of all the ions obeyed the Ho and McKay pseudo 2nd order rate law and the adsorption isotherm profile matched very well
with Langmuir model. The separation factor (RL
) of CPPCR for Pb(II), Cd(II) and Cr(III) were 0.190, 0.017, and 0.065,
respectively, indicating the formation of monolayer behaviour. The Gibb free energy (ΔG) of the adsorption for all the
metal ions have negative values indicating the adsorption process of Pb(II), Cd(II) and Cr(III) by CPPCR are spontaneous.