Medifikasi Bentonit Alam dan pengaruhnya terhadap pertukaran Ion dengan Kadmium.

Abstract

Telah dilakukan modifikasi bentonit alam menjadi bentonit natrium dan bentonit kalsium serta dilanjutkan dengan penentuan kapasitas pertukaran-kationnya terhadap ion Cd 2+. Modifikasi dilakukan dengan memperlakukan bentonit alam dalam larutan NaC1 1 N pada suhu 70 °C atau larutan CaC12 0,01 N, disertai pengadukan selama satu minggu. Kapasitas pertukaan kation ditentukan dengan cara batch menggunakan larutan CdSO4 8/3 H2O dengan variasi waktu pertukaran 1,5 — 48 jam. Disimpulkan bahwa kapasitas pertukaran kation bentonit adalah: bentonit natrium > bentonit alam > bentonit kalsium Meningkatnya konsentrasi adsorbat meningkatkan kapasitas pertukaran , namun prosentase pertukarannya menurun. Modification natural bentonit to sodium bentonit and calsium bentonit has been done and followed by determination of its cation exchange capasity to the Cd2+ ion. Modification was carried out by treating natural bentonit in NaCI 1 N solution at 70 °C or CaC12 0,01 N solution, stired for a week. Bentonit's cation exchange capasity was determined by batch method using CdSO4 8/3 H2O solution in time exchange variation 1.5 — 48 hours. It was concluded that the cation exchange capasity in order : sodium bentonit > natural bentonit> calsium bentonit The higher adsorbat concentration, the greater cation exchange capasity , but in the other hand it will reduce its cation exchange pe