PENENTUAN pH OPTIMUM DAN KAPASITAS ADSORPSI ION LOGAM Ni(II) OLEH KOMPOSIT KITOSAN-ALUMINA (DETERMINATION OF OPTIMUM pH AND ADSORPTION CAPACITY OF Ni(II) METAL ION BY CHITOSAN-ALUMINA COMPOSITE)

  • ELOK FARDA Department of Chemistry, Universitas Negeri Surabaya

Abstract

Abstrak. Tujuan dari penelitian ini adalah untuk mengetahui pH optimum dan mempelajari kapasitas adsorpsi ion logam Ni(II) oleh komposit kitosan-alumina. Penentuan pH optimum dilakukan dengan menginteraksikan 20 mL adsorbat dengan 0.1 gram adsorben pada variasi pH medium 3, 4, 5, 6 dan 7. Kapasitas adsorpsi ditentukan dengan memvariasi konsentrasi adsorbat ion logam Ni(II) pada 10, 40, 80, 100, 300, 700, 800, 900, 1000, 1200, 1600 dan 1800 mg/L pada pH optimum. Nilai pH optimum adsorpsi dihasilkan pada  pH 5 dengan daya adorpsi sebesar 30.275 %. Kapasitas adsorpsi komposit kitosan-alumina yang diperoleh menggunakan isotherm Langmuir sebesar 7.018x10-4 mol/g dan isotherm Freundlich sebesar 78.126x10-4 mol/g.

Kata Kunci: komposit kitosan-alumina, kapasitas adsorpsi.

Abstract. The aim of this experiment were to know optimum pH and to study adsorption capacity of Ni(II) metal ion by chitosan-alumina composite. Determination of optimum pH was did to interact 20 mL adsorbate with 0.1 gram adsorbent at variation of medium pH 3, 4, 5, 6 and 7. The adsosrption capacity was determined by various concentration of adsorbate Ni(II) metal ion 10, 40, 80, 100, 300, 700, 800, 900, 1000, 1200, 1600 and 1800 mg/L at Optimum pH. The result of optimum pH was pH 5 with adsorption value 30.275 %. The adsorption capacity of chitosan-alumina composite was 7.018x10-4 mol/g by Langmuir isotherm and 78.126x10-4 mol/g by Freundlich isotherm.

Keywords: chitosan-alumina composite, adsorption capacity.
Published
2013-01-31
Section
Articles
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