MODIFIKASI MAGNETIT MENGGUNAKAN ASAM HUMAT GUNA MENINGKATKAN KEMAMPUAN ADSORPSI TERHADAP ZAT WARNA MALACHITE GREEN
DOI:
https://doi.org/10.15294/.v0i0.12Kata Kunci:
Asam humat, magnetit, malachite green, adsorpsiAbstrak
Senyawa Fe3O4 memiliki luas permukaan yang besar, kapasitas adsorpsi yang besar dan mudah untuk dipisahkan karena medan magnet luar dapat menariknya. Namun, dibalik kelebihan tersebut, Fe3O4 mudah teroksidasi dan mengalami penggumpalan dalam larutan air yang dapat mempengaruhi daya serapnya. Oleh karena itu, perlu dilakukan modifikasi guna meningkatkan kinerja Fe3O4. Dalam penelitian ini, dilakukan pelapisan Fe3O4 menggunakan asam humat (AH) sebagai adsorben Fe3O4-AH untuk meningkatkan kemampuan adsorpsi terhadap zat warna malachite green. Asam humat diperoleh dari hasil isolasi tanah gambut Rawa Pening, Ambarawa, Jawa Tengah. Sintesis Fe3O4 dan Fe3O4-AH dilakukan menggunakan metode kopresipitasi menggunakan NaOH. Karakterisasi material menggunakan Fourier Transform Infrared (FTIR) Spectroscopy, X-Ray Diffraction (XRD) dan Surface Area Analyzer (SAA) Hasil karakterisasi menunjukkan adanya pembentukan ikatan antara gugus karboksilat pada AH dengan Fe pada Fe3O4 dan pelapisan asam humat pada magnetit tidak mengubah bentuk fasanya serta pelapisan AH mampu meningkatkan luas permukaan dari Fe3O4. Adsorpsi zat warna malachite green oleh asam humat optimum pada pH 3 selama 60 menit dengan konsentrasi awal optimum 96,95 mg/L, Fe3O4 optimum pada pH 7 selama 90 menit dengan konsentrasi awal optimum 83,48 mg/L dan Fe3O4-AH optimum pada pH 3 selama 90 menit dengan konsentrasi awal optimum 104,15 mg/L.
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