KINETICS AND EQUILIBRIUM MODEL OF Pb(II) AND Cd(II) ADSORPTION ONTO TETRAKIS-THIOMETHYL-C-4-METHOXYPHENYLCALIX[4]RESORCINARENE

Abstract

The ability of tetrakis-thiomethyl-C-4-methoxyphenylcalix[4]resorcinarene for trapping Pb(II) and Cd(II) from aqueous solution at different pH, contact times, and initial metal concentration was investigated. Concentration of metal ions before and after interaction was analyzed by Atomic Absorption Spectrophotometer (AAS). The result indicated that tetrakis-thiomethyl-C-4-methoxyphenylcalix[4]resorcinarene is a good host for metal ions, where Cd(II) sorption capacity was higher than that of Pb(II). Effect of pH on batch experiments for the mentioned ions indicated that the optimum pH for metal binding were 5 for both of lead(II) and cadmium(II). In order to investigate the mechanism of adsorption, the 1st-order, pseudo 1st-order, and pseudo 2nd-order kinetic models were used. The adsorption model of metal ions on the resorcinarene followed pseudo second order of Ho & McKay expression. The equilibrium adsorption isotherm has been analyzed by Langmuir and Freundlich equations. Langmuir model had the higher correlation coefficient than that of Freundlich model.

Study on the Adsorption Properties of Novel Calix[6]arene Polymers for Heavy Metal Cations

“…On the other hand, for adsorbent 2b and 2c, the adsorption kinetics of Cd(II) and Cr(III) followed kinetics model of Ho while for the Cu(II) followed Lagergren kinetic models. These results are similar by previous researchers [22] showed that adsorption of Cr(III) onto polypropylcalix [4]arenes followed the kinetics model of Ho. By using the three adsorbents, shows that the adsorption rate constant for Cr(III) is greatest when compared to the adsorption of Cd(II) and Cu(II).…”

Separation of Pb(II) Ion with Tetraacetic Acid Derivative of Calix[4]arene by Using Droplet-based Microreactor System

“…Even at the low concentration, Pb(II) pollution could damage the central nervous system and cause mortality [8]. Therefore, Pb(II) removal process has gained the highest interest over the past several years [9][10][11][12][13].…”

Green Synthesis : Crystal Structure and Bioactivity of C-(Psubstituted Phenyl) Calix[4] Resorcinarenes-Dmso Inclusion Complexes

“…Research work on different calix [4]resorcinarenes and proposing new efficient and green methods for their preparation is worldwide conducted. [12][13][14][15][16][17][18][19][20][21] Design and preparation of different types of lattice host molecules and investigating their ability to form different forms of crystalline materials with different potential applications are, therefore, of our main interest. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] Compounds 6-9 were reported in literature to be prepared in alcoholic acid catalyzed solutions as a mixture of two conformers; chair and boat were formed.…”

“…[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] Compounds 6-9 were reported in literature to be prepared in alcoholic acid catalyzed solutions as a mixture of two conformers; chair and boat were formed. [13,[15][16][17][18][19][20] In this work, the selective solvent-free formation of one isomeric product and the bioactivity of C-(p-substituted phenyl)calix [4] Scheme 1: Synthetic route for C-(p-substitutedphenyl)calix [4]resorcinarene 6-9. [36]…”