Sintesis Katalis Heterojunction ZnO/MIL-125(Ti) untuk Konversi Asam Oleat Menjadi Metil Ester melalui Proses Esterifikasi Fotokatalitik

Mujianah, Mujianah (2026) Sintesis Katalis Heterojunction ZnO/MIL-125(Ti) untuk Konversi Asam Oleat Menjadi Metil Ester melalui Proses Esterifikasi Fotokatalitik. KODEPRODI47201#KIMIA, Institut Teknologi Sepuluh Nopember. (Unpublished)

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Abstract

Pada penelitian ini fotokatalis ZnO/MIL-125(Ti) dengan jumlah ZnO 5, 10, 15wt% disintesis dengan metode solvotermal dan impregnasi sebagai fotokatalis untuk konversi asam oleat menjadi metil ester melalui reaksi esterifikasi fotokatalitik. Selanjutnya, katalis hasil sintesis dikarakterisasi dengan XRD untuk mengetahui struktur kristalnya, FTIR untuk mengetahui ikatan kimia dan gugus fungsinya, dan adsorpsi-desorpsi N2 digunakan penentuan luas permukaan dari katalis. Sifat optik dari katalis ditentukan dengan UV-Vis DRS, dan morfologi permukaan menggunakan SEM-EDX. Aktivitas fotokatalitik dievaluasi melalui pengaruh jumlah katalis, komposisi ZnO, rasio molar asam oleat terhadap metanol, waktu reaksi, dan suhu reaksi. Kinerja katalis ditentukan berdasarkan selektivitas metil ester yang diperoleh dari analisis titrasi dan GC-MS. Pada pengujian aktivitas fotokatalitik, komposit 10 wt% ZnO/MIL-125(Ti) (10ZM) menunjukkan kinerja terbaik dengan selektivitas metil ester sebesar 32,61%. Kondisi reaksi optimum diperoleh pada massa katalis 3 wt%, rasio molar asam oleat 1:5, waktu reaksi 2 jam, dan suhu 60–65°C. Hasil penelitian menunjukkan bahwa komposit ZnO/MIL-125(Ti) memiliki aktivitas fotokatalitik dalam reaksi esterifikasi asam oleat menjadi metil ester dan berpotensi untuk dikembangkan lebih lanjut sebagai fotokatalis heterogen pada produksi biodiesel.
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In this study, ZnO/MIL-125(Ti) photocatalysts containing 5, 10, and 15 wt% ZnO were synthesized using a combination of solvothermal and impregnation methods and employed as photocatalysts for the conversion of oleic acid into methyl esters through a photocatalytic esterification reaction. The synthesized catalysts were characterized by X-ray diffraction (XRD) to determine their crystal structure, Fourier-transform infrared spectroscopy (FTIR) to identify chemical bonds and functional groups, and N₂ adsorption–desorption analysis to determine their specific surface area. The optical properties of the catalysts were investigated using UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS), while their surface morphology and elemental composition were analyzed by scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM–EDX). Photocatalytic activity was evaluated by examining the effects of catalyst loading, ZnO composition, oleic acid-to-methanol molar ratio, reaction time, and reaction temperature. Catalyst performance was assessed based on methyl ester selectivity determined through GC-MS analyses. Among the synthesized composites, 10 wt% ZnO/MIL-125(Ti) (10ZM) exhibited the best photocatalytic performance, achieving a methyl ester selectivity of 32.61%. The optimum reaction conditions were obtained using a catalyst loading of 3 wt%, an oleic acid-to-methanol molar ratio of 1:5, a reaction time of 2 h, and a reaction temperature of 60–65 °C. These results demonstrate that ZnO/MIL-125(Ti) possesses photocatalytic activity for the esterification of oleic acid into methyl esters and shows potential for further development as a heterogeneous photocatalyst for biodiesel production.

Item Type:	Other
Uncontrolled Keywords:	Asam Oleat, Esterifikasi, Fotokatalis, Komposit ZnO/MIL-125(Ti), Metil Ester, Methyl Esters, Photocatalyst, Esterfication, Zn/MIL-125(Ti) composite, Oleid Acid
Subjects:	Q Science > QD Chemistry > QD501 Catalysis. Catalysts.
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Mujianah
Date Deposited:	05 Aug 2026 00:51
Last Modified:	05 Aug 2026 00:51
URI:	http://repository.its.ac.id/id/eprint/143535

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