Kinetic modelling, equilibrium and selectivity of heavy metal ions adsorption onto C-4- bromophenylcalix[4]resorcinarene
Solhe F Alshahateet, Ahmad S Eldouhaibi, Salah A Al-Trawneh, Anwar G Jiries and Mohammed M Al-Mahadeen
: J Diagnos Tech Biomed Anal
Abstract
Adsorption studies were performed on selected heavy metal ions ((Pb (II), Co (II), Cu (II), Mn (II) and Zn (II)) using synthetic adsorbent (C-4-bromophenylcalix[4]resorcinarene 3) to investigate the effect of different parameters such as adsorbate dose, agitation time, and pH. Selectivity of the adsorbents towards a mixture of heavy metals adsorbates was investigated. Results showed that optimum agitation time was 30 min at pH of 5.6 and initial concentration of 1ppm for all investigated heavy metals. Different kinetic models of Santosa first order, Lagergren pseudo first order and Ho pseudo second order were applied on the adsorption experimental data. Results proved that all adsorption processes were followed and adopted pseudo second order kinetic model. The adsorption capacity of C-4-bromophenylcalix[4]resorcinarene towards the selected heavy metal ions was 84.55%, 84.29%, 84.06%, 79.76%, 75%, for Cu (II), Pb (II), Zn(II), Mn (II) and Co (II), respectively. Selectivity of adsorption was tested on a mixture of Cu (II), Mn (II), Zn (II), Pb (II) and Co (II) with initial concentration of 1 ppm of each heavy metal and agitated time of 10 min with the adsorbent, removal percentage of each metal showed different values from each heavy metal alone as it was in decreasing order Cu (II) > Co (II) > Mn (II) > Pb (II) > Zn (II).
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