Sintesis Komposit Zeolit-Magnetit Sebagai Adsorben Ion Logam Co(II)

KINANTINA WIDHASTU, Dr. Suyanta, M.Si ; Prof. Dr. Bambang Rusdiarso, DEA

2016 | Skripsi | S1 KIMIA

Sintesis komposit zeolit-magnetit dan aplikasinya untuk adsorpsi ion logam Co(II) telah dilakukan. Tujuan penelitian adalah sintesis komposit zeolit-magnetit dan mengkaji kinerja adsorben zeolit-magnetit untuk mengadsorp Co(II) dalam air. Komposit zeolit-magnetit disintesis dari zeolit alam dengan magnetit, campuran larutan FeSO4.7H2O dan larutan FeCl3.6H2O. Sintesis dilakukan pada temperatur 85 C dengan penambahan NH4OH hingga pH 11. Komposit zeolit-magnetit hasil sintesis selanjutnya dikarakterisasi menggunakan FTIR (Fourier Transform Infrared Spectroscopy), XRD (X-Ray Diffraction), dan SAA (Surface Area Analyzer). Komposit zeolit-magnetit hasil sintesis digunakan untuk mengadsorpsi ion logam Co(II), setelah proses adsorpsi kemudian dilakukan uji recovery. Banyaknya ion logam Co(II) yang teradsorp pada komposit zeolit-magnetit dianalisis dengan AAS (Atomic Adsorption Spectroscopy). Hasil penelitian menunjukkan bahwa kesetimbangan adsorpsi ion logam Co(II) tercapai dalam waktu 120 menit. Kinetika adsorpsi ion logam Co(II) memenuhi aturan dari Ho yang merupakan kinetika adsorpsi orde dua semu dan memiliki harga konstanta laju sebesar 0,0301 g/mg.menit. Adsorpsi ion logam Co(II) pada komposit zeolit-magnetit mengikuti termodinamika adsorpsi model Langmuir dengan kapasitas adsorpsi sebesar 23,47 mg/g dan energi adsorpsi sebesar 19,85 kJ/mol. Uji recovery menunjukkan bahwa adsorben komposit zeolit-magnetit setelah proses adsorpsi dapat dipisahkan lebih cepat menggunakan medan magnet eksternal dibanding pemisahan yang hanya bergantung pada gaya gravitasi.

Synthesis of zeolite-magnetite composite and its application for adsorp to Co(II) metal ion had been carried out. The aim of this research is to synthesis of zeolite-magnetite composite and study the activity of zeolite-magnetite adsorbent to adsorp Co(II) in water. Zeolite-magnetite composite was synthesized from natural zeolite with magnetite, mixed of FeSO4.7H2O and FeCl3.6H2O. Synthesis was conducted by coprecipitation method at 85 C and pH 11. The product was characterized using Fourier transform infrared spectroscopy, X-ray diffractometry, and Surface area analyzer. The product was then used to adsorp Co(II) metal ion, after adsorption process conducted recovery test. Co(II) metal ion that adsorped on zeolite-magnetite composites was analyzed using AAS. The result showed that adsorption equilibrium of Co(II) metal ion reached at 120 minutes, adsorption kinetic of Co(II) metal ion applied the rule of Ho as second pseudo order and rate constant of 0.0301 g/mg.min. Co(II) metal ion adsorption on zeolite-magnetite composite followed the Langmuirs adsorption mode with adsorption capacity of 23.47 mg/g and adsorption energy of 19.85 kJ/mol. The recovery test showed zeolite-magnetite composites adsorbent after adsorption process can be separated more rapid using an external magnetic field rather than segregation that depends only on the force of gravity.

Kata Kunci : zeolit alam, zeolit-magnetit, orde reaksi, konstanta laju, kapasitas adsorpsi