MODIFIKASI BIOMASSA Nitzschia sp. DENGAN SILIKA-MAGNETIT SEBAGAI ADSORBEN ION Cd(II), Cu(II), DAN Pb(II) DALAM LARUTAN

Dia Tamara, 1117011015 (2015) MODIFIKASI BIOMASSA Nitzschia sp. DENGAN SILIKA-MAGNETIT SEBAGAI ADSORBEN ION Cd(II), Cu(II), DAN Pb(II) DALAM LARUTAN. FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM, UNIVERSITAS LAMPUNG.

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Abstrak

ABSTRAK Pada penelitian ini, biomassa alga Nitzschia sp. telah dimodifikasi dengan silika-magnetit menggunakan metode sol-gel, dan kemudian diuji sebagai adsorben ion Cd(II), Cu(II), dan Pb(II) dalam larutan. Kedua adsorben disiapkan dan dispesifikasikan sebagai hibrida alga silika (HAS) dan hibrida alga silika-magnetit (HAS-M). Adsorben dikarakterisasi menggunakan beberapa teknik, antara lain Infrared (IR) Spectroscopy untuk analisis gugus fungsi, X-ray diffraction (XRD) untuk analisis struktur, Scanning Electron Microscope (SEM) untuk analisis morfologi permukaan dan Energy Dispersive X-ray (EDX) Spectroscopy untuk analisis komposisi unsur. Untuk mengetahui kapasitas adsorpsi dari adsorben, serangkaian percobaan adsorpsi telah dilakukan dan konsentrasi ion logam ditentukan dengan menggunakan spektrofotometer serapan atom (SSA). Hasil yang diperoleh menunjukkan bahwa adsorben mampu menyerap ion logam hingga 90%. Selain itu, diperoleh kondisi optimum untuk hasil terbaik adalah pH 5 untuk Cu(II) dan Pb(II), dan pH 7 untuk Cd(II). Isoterm adsorpsi menunjukkan bahwa adsorpsi mengikuti isoterm Langmuir, dengan R2 = 0,86 -0,99. Energi adsorpsi berada dikisaran 25,86 - 33,90, menunjukkan bahwa adsorpsi berlangsung melalui interaksi kimia antara ion logam dan adsorben. Kata Kunci : adsorpsi, biomassa Nitzschia sp., sol-gel, magnetit ABSTRACT In this study, Nitzschia sp. algae biomass was modified with silica-magnetite using sol-gel method, and subsequently tested as adsorbent for Cd(II), Cu(II) and Pb(II) ions dissolved in water. Two adsorbents were prepared and specified as hybrid silica algae (HAS) and the hybrid algae silica-magnetite (HAS-M). The adsorbents were characterized using several techniques, include Infrared (IR) Spectroscopy for functionality analysis, X-ray diffraction (XRD) for structural analysis, Scanning Electron Microscope (SEM) for surface morphology analysis, and Energy Dispersive X-ray (EDX) Spectroscopy for elemental composition analysis. To investigate the adsorption capacity of the adsorbents, a series of adsorption experiments was conducted and the concentrations of the metal ions was determied using atomic absorption spectrophotometer (AAS). The results obtained revealed that the adsorbents were able to adsorb the metal ions up to 90%. In addition, it was found that the optimum conditions for the best results are pH 5 for Cu(II) and Pb(II), and pH 7 for Cd(II). The adsorption isotherm indicate that adsorption follows the Langmuir isotherm, with the R2 = 0.86 - 0.99. The adsorption energies are in the range of 25,86 - 33,90, suggesting that the adsorption took place through chemical interaction between the metal ions and the adsorbents. Keywords: adsorption, biomass Nitzschia sp., sol-gel, magnetite

Tipe Karya Ilmiah: Skripsi
Subyek: Q Science (General) > QD Chemistry
Program Studi: Fakultas MIPA > Prodi Kimia
Depositing User: 4519940 . Digilib
Date Deposited: 11 Dec 2015 08:14
Last Modified: 11 Dec 2015 08:14
URI: http://digilib.unila.ac.id/id/eprint/15640

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