Zakiyah, Anisun (2021) Aplikasi Esterifikasi dan Foto-esterifikasi Minyak Kemiri menggunakan ZnO Nanopartikel yang Disintesis dengan Teknik Poliol. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Seng oksida nanopartikel (ZnO NPs) telah disintesis menggunakan teknik poliol dengan konsentrasi Zn2+ (z) = 0,5 mol/L; rasio H2O terhadap Zn2+ (h) = 5; dan rasio basa terhadap Zn2+ (b) = 1. ZnO NPs dikarakterisasi dengan instrumen XRD, SEM, FESEM, dan UV-DRS. Hasil karakterisasi menujukkan bahwa ZnO NPs yang disintesis melalui teknik poliol memiliki struktur kristal heksagonal, ukuran partikel kurang dari 100 nm, bentuk partikel relatif bulat (spheris) dan teraglomerasi serta memiliki lebar celah pita energi 3,2 eV. Teknik poliol mampu menghasilkan partikel ZnO 5-10 kali lipat lebih kecil daripada metode kopresipitasi. Mempertimbangkan ukuran partikel yang berbeda, ZnO dari kedua metode diteliti perbedaan aktivitasnya pada aplikasi reaksi esterifikasi dan foto-esterifikasi minyak kemiri. Pada reaksi esterifikasi, ZnO poliol mampu mengonversi seluruh FFA pada minyak kemiri menjadi FAME dengan total FAME sekitar 70%. ZnO kopresipitasi memberikan hasil yang lebih rendah daripada ZnO poliol. Pada reaksi foto-esterifikasi, dengan adanya iradiasi sinar UV, ZnO bertindak sebagai fotokatalis sehingga reaksi diduga mengikuti mekanisme fotokatalisis. Dalam hal ini, ZnO poliol dan kopresipitasi memberikan hasil %FAME yang tidak jauh berbeda yaitu sekitar 57-59%. Hal ini menunjukkan bahwa perbedaan ukuran partikel dan morfologi pada kondisi reaksi tidak memengaruhi kinerja fotokatalitik.
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Zinc oxide nanoparticles (ZnO NPs) were synthesized using the polyol technique with concentration of Zn2+ (z) = 0.5 mol/L; ratio of H2O to Zn2+ (h) = 5; and ratio of base to Zn2+ (b) = 1. ZnO NPs were characterized by XRD, SEM, FESEM, and UV-DRS instruments. The characterization results showed that the ZnO NPs synthesized through the polyol technique had a hexagonal crystal structure, particle size less than 100 nm, relatively spherical, and had an band gap energy around 3.2 eV. The polyol technique is able to produce ZnO particles 5-10 times smaller than the coprecipitation method. Considering the different particle sizes, the activity of ZnO from the two methods was investigated on the application of the esterification and photo-esterification reaction of candlenut oil. In the esterification reaction, ZnO polyol was able to convert all FFA in candlenut oil into FAME with total FAME around 70%. ZnO coprecipitation gives lower yield than ZnO polyol. In the photo-esterification reaction, in the presence of UV light irradiation, ZnO acts as a photocatalyst so that the reaction is thought to follow the photocatalytic mechanism. In this case, ZnO polyol and coprecipitation gave a similar %FAME result which was around 57-59%. This shows that differences in particle size and morphology under reaction conditions do not affect photocatalytic performance.
Item Type: | Thesis (Masters) |
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Uncontrolled Keywords: | Seng Oksida (ZnO), Teknik Poliol, Esterifikasi, Minyak Kemiri, Zinc Oxide (ZnO), Polyol Technique, Esterification, Candlenut Oil |
Subjects: | Q Science > QD Chemistry > QD181.Z6 Zinc oxide Q Science > QD Chemistry > QD305.A2 O73 Esterification Q Science > QD Chemistry > QD501 Catalysis. Catalysts. Q Science > QD Chemistry > QD716 Photocatalysis. |
Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47101-(S2) Master Thesis |
Depositing User: | Anisun Zakiyah |
Date Deposited: | 26 Aug 2021 02:21 |
Last Modified: | 26 Aug 2021 02:21 |
URI: | http://repository.its.ac.id/id/eprint/89789 |
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