ADSORPTION OF Pb(II), Cd(II), AND Cr(III) FROM AQUEOUS SOLUTION BY POLY-5-ALLYL-CALIX[4]ARENE TETRA CARBOXYLIC ACID

Desi Suci Handayani (Student of Doctorate Program, Department of Chemistry, Faculty of Mathematic and Natural Sciences, Universitas Gadjah Mada)
Jumina Jumina (Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada Sekip Utara, Yogyakarta 55281)
Dwi Siswanta (Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada Sekip Utara, Yogyakarta 55281)
Mustofa Mustofa (Department of Pharmacology and Toxicology, Faculty of Medicine, Universitas Gadjah Mada, Bulaksumur Yogyakarta 55281)
Keisuke Ohto (Department of Applied Chemistry, Faculty of Science and Engineering, Saga University, 1-Honjo, Saga 840-8502)
Hidetaka Kawakita (Department of Applied Chemistry, Faculty of Science and Engineering, Saga University, 1-Honjo, Saga 840-8502)

Indonesian Journal of Chemistry
Vol 11, No 2 (2011)

The aim research is application of poly-5-allyl-calix[4]arene tetra carboxylic acid as adsorbent of heavy metal cations. Adsorption was carried out towards Pb(II), Cd(II) and Cr(III) ions in batch system. Several variables including pH, contact time and initial concentration of metal ions were determined. The optimum adsorption conditions were achieved at pH 6.0 for Cd(II) and Cr(III), while at pH 5.5 for Pb(II) ions. In addition, the optimum contact time of Pb (II), Cd(II) and Cr(III) ion adsorption were 180 min. The adsorption kinetics of Pb(II), Cd(II) and Cr(III) ions using the calixarene polymer adsorbent followed a pseudo 2nd order kinetics model, with adsorption rate constants of 2x10-2; 5x10-3, and 3.1x10-2 g mole-1 min-1, respectively. Furthermore, the adsorption isotherm of Pb(II) and Cd(II) ions tends to follow the Freundlich isotherm, whereas the adsorption of Cr (III) tends to follow the Langmuir isotherm. The adsorption capacity of Pb(II), Cd(II) and Cr(III) metal ions were 104.04, 61.78 and 228.69 μmole/g, with adsorption energy of 24.87; 21.62 and 31.07 KJ/mole, respectively.