Sintesis Zeolit A dari Lumpur Geotermal dengan Variasi Rasio Si/Al untuk Aplikasi Adsorpsi Metilen Biru

Maharani, Melvi Yanifa (2026) Sintesis Zeolit A dari Lumpur Geotermal dengan Variasi Rasio Si/Al untuk Aplikasi Adsorpsi Metilen Biru. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Lumpur geotermal memiliki kandungan silika yang tinggi sehingga berpotensi sebagai sumber silika dalam sintesis zeolit A. Penelitian ini bertujuan untuk mendapatkan zeolit A dari lumpur geotermal dengan melalui proses pelindian untuk meningkatkan kemurnian silika pada lumpur. Sintesis dilakukan dengan variasi rasio Si/Al sebesar 0,8; 1; 1,2; 1,4; 1,6; 1,8 dan 2, kemudian keberhasilkan sintesis dikonfirmasi melalui karakterisasi XRD, FTIR dan FESEM-EDX. Material terbaik yang dihasilkan selanjutnya dipilih sebagai adsorben untuk uji adsorpsi MB. Hasil XRD menunjukkan puncak-puncak khas dari zeolit A dan sampel dengan rasio Si/Al 1,4, teramati pada 2θ = 7; 10,02; 12,26; 15,92; 20,21; 21,18; 21,45; 23,84; 25,92; 26,94; 29,76; 30,63; 32,34; 33,11; 34,02; 35,54; 36,3; dan 37,79°, menghasilkan ketajaman puncak difraksi paling baik dengan intensitas tertinggi. Spektrum FTIR yang diperoleh menunjukkan pita serapan khas struktur LTA yang menandakan keberhasilan pembentukan zeolit A, terutama pita serapan yang kuat sekitar 551 cm-1 yang dikaitkan dengan vibrasi dari unit double four-membered ring (D4R). FESEM-EDX zeolit A rasio Si/Al 1,4 menunjukkan morfologi kristal kubik bertepi miring (chamfered edges) dengan ukuran partikel rata-rata sebesar 1,62 µm dan kandungan unsur Si, Al, O dan Na yang homogen. Analisis luas permukaan menunjukkan ketersediaan situs aktif yang memadai untuk berinteraksi dengan molekul MB, yaitu sebesar 48,14 m2/g. Kondisi optimum adsorpsi metilen biru diperoleh pada konsentrasi awal 30 ppm, massa adsorben 0,03 g dan pH 11. Adsorpsi MB pada zeolit A mengikuti model isotermal Langmuir dan model kinetika pseudo-orde dua.
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Geothermal sludge has a high silica content, making it a potential source of silica for the synthesis of zeolite A. This study aims to obtain zeolite A from geothermal sludge through a leaching process to increase the purity of the silica in the sludge. The synthesis was carried out with variations of Si/Al ratio 0.8, 1, 1.2, 1.4, 1.6, 1.8, and 2, the success of the synthesis was confirmed through XRD, FTIR and FESEM-EDX characterization. The best material produced was then selected as an adsorbent for the MB adsorption. The XRD results showed characteristic peaks of zeolite A and the sample with a Si/Al ratio of 1.4, observed at 2θ = 7; 10.02, 12.26, 15.92, 20.21, 21.18, 21.45, 23.84, 25.92, 26.94, 29.76, 30.63, 32.34, 33.11, 34.02, 35.54, 36.3 and 37.79°, produced the sharpest diffraction peaks with the highest intensity. The FTIR spectra obtained showed absorption bands characteristic of the LTA structure, indicating the successful formation of zeolite A, particularly a strong absorption band around 551 cm-1 associated with the vibration of the double four-membered ring (D4R) unit. FESEM-EDX analysis of zeolite A with a Si/Al ratio of 1.4 revealed a cubic crystal morphology with chamfered edges, an average particle size of 1.62 µm, and a homogeneous content of Si, Al, O and Na. Surface area analysis indicated the availability of sufficient active sites to interact with MB molecules, amounting to 48.14 m2/g. Optimal conditions for methylene blue adsorption were obtained at an initial concentration of 30 ppm, an adsorbent mass of 0.03 g and a pH of 11. MB adsorption on zeolite A follows the Langmuir isotherm model and a pseudo-second order kinetic model.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Lumpur Geotermal, Hidrotermal, Zeolit A, Rasio Si/Al, Adsorpsi,Geothermal Sludge, Hydrothermal, Zeolite A, Si/Al Ratio, Adsorption
Subjects:	Q Science > QD Chemistry > QD547 Flocculation, precipitation, adsorption, etc. Q Science > QD Chemistry > QD905.2 Crystals.
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Melvi Yanifa Maharani
Date Deposited:	05 Aug 2026 01:47
Last Modified:	05 Aug 2026 01:47
URI:	http://repository.its.ac.id/id/eprint/143686

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