ADSORPSI ION LOGAM Pb(II), Cd(Il) dan Cr(III) OLEH POLl 5 ALLIL-KALIKS [4] ARENA TETRAESTER (Adsorption of Pb(II), Cd(II), and Cr(IIl) by Poly-5-allyl-calix{4]arene tetraester)

Penelitian ini bertujuan untuk mengkaji pemanfaatan poli-5-allilkaliks[4]arena tetraester sebagai adsorben kation logam berat. Adsorpsi dilakukan dengan metode batch pada variasi keasaman (pH), waktu kontak dan konsentrasi awal ion logam. Hasil eksperimen menunjukkan bahwa pH optimum adsorpsi adalah pH 4,0 untuk ion logam Pb(II) dan Cd(II), sedangkan untuk Cr(III) pada pH 6,0. Waktu kontak optimum adsorpsi ion logam Cd(II) dan Cr(III) adalah 135 menit, sedangkan untuk ion logam Pb(II) adalah 180 menit. Kajian kinetika adsorpsi menunjukkan bahwa adsorpsi ion logam Pb(II), Cd(II) dan Cr(III) menggunakan adsorben poli-5-allilkaliks[4]arena tetraester mengikuti model kinetika Ho, pseudo orde 2, dengan konstanta laju adsorpsi berturut-turut 10&#1471³, 9x1O&#1471³dan 3,6x10&#1471² g mol&#1471¹ menit&#1471¹. Kajian isotherm menunjukkan bahwa adsorpsi ion logam Pb(II) cenderung mengikuti isotherm Freundlich, sedangkan adsorpsi ion Cd(II) dan Cr(III) cenderung mengikuti isotherm Langmuir. Kapasitas maksimum adsorpsi ion logam Pb(II), Cd(II) dan Cr(III) masing-masing sebesar 187,6345,63 clan197,25 µmo/g, dengan energi adsorpsi berturut-turut 23,1415,18 dan27,15 KJ/mol. The aim research is application ofpoly-5-allyl-calix{4}arene tetraester as adsorbent of heavy metal cations. Adsorption was carried out towards Pb(II). Cd(ll) and Cr(lIl) 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 4.0for Pb(lI) and Cd(II), while at pH 6.0for Cr(llI) ions. In addition, the optimum contact time of Cd(lI) and Cr(llI) ions adsorption were 135 minutes, while thosefor Pb(lI) ion was 180 minutes. The adsorption kinetics of Pb(II). Cd(lI) and Cr(lIl) ions using the calixarene polymer adsorbentfollowed a fseudo 2nd order kinetics model, with adsorption rate constants of 10&#1471³, 9x10&#1471³ dan 3,6x10&#1471² g mole&#1471¹ min&#1471¹ , respectively. Furthermore, The adsorption isotherm of Pb(lI) ion tends tofollow the Freundlich isotherm, whereas the adsorption of Cd(lI) and Cr (III) ions tends to follow the Langmuir isotherm. The adsorption capacity of Pb(II), Cd(lI) and Cr(lIl) metal ions were 87.63, 45.63 and 197.25 µmole/g, with adsorption energy of 23.14, 15.18 and 27./5 KJ / mole, respectively

ADSORPSI ION LOGAM Pb(II) dan Cr(III) OLEH POLI 5ALLILKALIKS[4]ARENA TETRAESTER (Adsorption of Pb(II), Cd(II), and Cr(III) by Poly-5-allyl-calix[4]arene tetraester)

ABSTRACTThe aim research is application of poly-5-allyl-calix[4]arene tetraester 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 4.0 for Pb(II) and Cd(II), while at pH 6.0 for Cr(III) ions. In addition, the optimum contact time of Cd(II) and Cr(III) ions adsorption were 135 minutes, while those for Pb(II) ion was 180 minutes. 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 10-3, 9x10-3 dan 3,6x10-2 g mole-1 min-1, respectively. Furthermore, The adsorption isotherm of Pb(II) ion tends to follow the Freundlich isotherm, whereas the adsorption of Cd(II) and Cr (III) ions tends to follow the Langmuir isotherm. The adsorption capacity of Pb(II), Cd(II) and Cr(III) metal ions were 187.63, 45.63 and 197.25 μmole/g, with adsorption energy of 23.14, 15.18 and 27.15 KJ / mole, respectively.ABSTRAKPenelitian ini bertujuan untuk mengkaji pemanfaatan poli-5-allilkaliks[4]arena tetraester sebagai adsorben kation logam berat. Adsorpsi dilakukan dengan metode batch pada variasi keasaman (pH), waktu kontak dan konsentrasi awal ion logam. Hasil eksperimen menunjukkan bahwa pH optimum adsorpsi adalah pH 4,0 untuk ion logam Pb(II) dan Cd(II), sedangkan untuk Cr(III) pada pH 6,0. Waktu kontak optimum adsorpsi ion logam Cd(II) dan Cr(III) adalah 135 menit, sedangkan untuk ion logam Pb(II) adalah 180 menit. Kajian kinetika adsorpsi menunjukkan bahwa adsorpsi ion logam Pb(II), Cd(II) dan Cr(III) menggunakan adsorben poli-5-allilkaliks[4]arena tetraester mengikuti model kinetika Ho, pseudo orde 2, dengan konstanta laju adsorpsi berturut-turut 10-3, 9x10-3 dan 3,6x10-2 g mol-1 menit-1. Kajian isotherm  menunjukkan bahwa adsorpsi ion logam Pb(II) cenderung mengikuti isotherm Freundlich, sedangkan adsorpsi ion Cd(II) dan Cr(III) cenderung mengikuti isotherm Langmuir. Kapasitas maksimum adsorpsi ion logam Pb(II), Cd(II) dan Cr(III) masing-masing sebesar 187,63; 45,63 dan 197,25 µmol/g, dengan energi adsorpsi berturut-turut 23,14; 15,18 dan 27,15 KJ/mol.

ADSORPTION OF Cd(II), Pb(II), AND Cr(III) ONTO POLY-5-ALLYL-25,26,27,28-TETRAHYDROXYCALIX[4]ARENE

Poly-5-allyl-25,26,27,28-tetrahydroxycalix[4]arene can be applied as an adsorbent of heavy metal cations due to the presence of an active hydroxyl group (-OH). In the form of polymer, the cyclic hydroxyl groups and calix[4]arenes cavity are arranged in a series to form a tunnel-liked structure, which will maximize the adsorption process for 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 4.0, 4.5 and 5.5 for Pb(II), Cd(II) and Cr(III) ions, respectively. In addition, the optimum contact time of Pb (II) ion adsorption was 180 minutes, while those for Cd (II) and Cr(III) ions were 135 minutes.The adsorption kinetics of Pb(II), Cd(II) and Cr(III) ions using the calixarene polymer adsorbent followed a pseudo 2 nd order kinetics model, with adsorption rate constants of 10 &#831

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

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