Sintesis Fe@Silicalite-1 Dari Lumpur Geotermal Dan Aplikasinya Untuk Adsorpsi Metilen Biru

Prameswara, Bintang (2025) Sintesis Fe@Silicalite-1 Dari Lumpur Geotermal Dan Aplikasinya Untuk Adsorpsi Metilen Biru. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Lumpur geotermal memiliki kandungan silika yang cukup tinggi (85-93%), sehingga berpotensi digunakan sebagai bahan baku alternatif untuk mensintesis zeolit Silicalite-1 (S-1). Penelitian ini memanfaatkan lumpur geotermal sebagai bahan baku dalam sintesis disertai dengan doping Fe, yang membentuk S-1 terdoping Fe (Fe@S-1). Material yang dihasilkan selanjutnya diuji kinerjanya pada proses adsorpsi terhadap metilen biru. Fe@S- 1 disintesis dengan metode hidrotermal, setelah lumpur geotermal dilindi terlebih dahulu untuk mengurangi pengotor dan meningkatkan kandungan silika. Variasi konsentrasi Fe yang digunakan adalah sebesar 0,002; 0,005 dan 0,014 mol. Hasil karakterisasi XRD, FTIR dan FESEM-EDX menunjukkan bahwa penambaan Fe sebesar 0,002 dan 0,005 mol tidak menyebabkan perubahan struktur kristal S-1. Doping Fe membentuk gugus aktif Fe-O-Si dengan morfologi partikel bulat (spherical) dengan ukuran rata rata partikel 2,8 µm. Sebaliknya, penambahan Fe sebesar 0,014 mol menyebabkan pembentukan struktur amorf, dimana kristal S-1 tidak terbentuk. Uji adsorpsi metilen biru menunjukkan kapasitas adsorpsi tertinggi pada variasi 0,014 mol diikuti oleh variasi 0,002 mol, 0,005 mol dan S-1 tanpa doping Fe. Analisis kinetika adsorpsi menunjukkan bahwa proses adsoprsi mengikuti model pseudo-orde dua (PSO), sedangkan analisis adsorpsi isotermal menunjukkan kesesuaian dengan model Langmuir, yang mengindikasikan proses adsorpsi monolayer pada permukaan homogen.
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Geothermal sludge contains a relatively high silica content (85–93%), making it a potential alternative raw material for the synthesis of Silicalite-1 (S-1) zeolite. In this study, geothermal sludge was utilized as a precursor in the synthesis process combined with Fe doping, forming Fe-doped S-1 (Fe@S-1). The resulting material was further evaluated for its performance in the adsorption of methylene blue. Fe@S-1 was synthesized via a hydrothermal method after the geothermal sludge underwent an acid leaching process to reduce impurities and increase silica content. The Fe concentrations used were 0.002: 0.005, and 0.014 mol. Characterization results from XRD, FTIR, and FESEM-EDX indicated that Fe doping at 0.002 and 0.005 mol did not alter the crystalline structure of S-1. The incorporation of Fe formed active Fe–O–Si groups with spherical particle morphology and an average particle size of 2.8 µm. In contrast, the addition of 0.014 mol Fe led to the formation of an amorphous structure, in which the S-1 crystalline phase did not form. Adsorption tests of methylene blue showed the highest adsorption capacity at 0.014 mol Fe, followed by 0.002 mol, 0.005 mol, and undoped S-1. Kinetic adsorption analysis revealed that the adsorption process followed the pseudo-second-order (PSO) model, while isotherm analysis corresponded to the Langmuir model, indicating monolayer adsorption on a homogeneous surface.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	adsorpsi, Fe@S-1, hidrotermal, lumpur geotermal, pelindihan adsorption, Fe@S-1, geothermal sludge, hydrothermal, leaching
Subjects:	Q Science > QD Chemistry > QD501 Catalysis. Catalysts.
Divisions:	Faculty of Natural Science > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Bintang Prameswara
Date Deposited:	05 Aug 2025 11:17
Last Modified:	05 Aug 2025 11:19
URI:	http://repository.its.ac.id/id/eprint/127465

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