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SINTESIS MAGNETIT DARI LIMBAH TAMBANG BAUKSIT MENGGUNAKAN TEMPLAT CETYLTRIMETHYLAMMONIUMBROMIDE
Abstract
Red mud dari tailing bauksit memiliki komposisi unsur besi cukup tinggi, yang memungkinkannya dijadikan bahan dasar sintesis magnetit. Pada penelitian ini dilakukan sintesis magnetit dari red mud dengan metode kopresipitasi menggunakan reagen pengendap NH4OH. Untuk mengontrol distribusi ukuran partikel yang dihasilkan, digunakan templat cetyltrimethylammoniumbromide (CTAB) dengan konsentrasi 0, 1 dan 2 mM. Karakterisasi magnetit hasil sintesis dilakukan menggunakan metode spektrofotometri inframerah (FTIR), difraksi sinar-X (XRD), pemindaian dengan mikroskop elektron (SEM), dan analisis ukuran partikel (PSA). Hasil penelitian memperlihatkan keberhasilan sintesis magnetit, yang dikonfirmasi melalui spektrum FTIR dan XRD. Vibrasi gugus Fe-O oktahedral dan tetrahedral dari magnetit (Fe3O4) dikarakterisasi melalui bilangan gelombang sekitar 420 cm-1 dan 550 cm-1 pada spektrum FTIR, yang didukung oleh data XRD pada nilai 2q = 30,29 ; 36,15 dan 63,55, masing-masing untuk bidang kristal (220), (311) dan (440) dari kristal magnetit. Hasil PSA menunjukkan bahwa peningkatan konsentrasi CTAB menurunkan rata-rata ukuran partikel dan nilai indeks polidispersi (PI) partikel magnetit. Hal tersebut mengindikasikan terjadinya peningkatan homogenitas dispersi partikel dalam larutan. Namun, nilai PI yang dihasilkan masih relatif tinggi (>1,68) yang diperkirakan akibat terjadinya aglomerasi. Hal tersebut dikonfirmasi melalui hasil SEM yang memperlihatkan aglomerasi pada morfologi permukaan magnetit.
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DOI: http://dx.doi.org/10.24817/jkk.v43i2.6516
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