Sekam Padi Sebagai Sumber Silika Untuk Sintesis Silika Berpori: Studi Komparasi Daerah Asal Dan Kondisi Leaching HCl

Buhungo, Syahrul Saharudin (2026) Sekam Padi Sebagai Sumber Silika Untuk Sintesis Silika Berpori: Studi Komparasi Daerah Asal Dan Kondisi Leaching HCl. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sekam padi mengandung silika sebesar 80-97%, limbah biomassa ini berpotensi sebagai prekursor silika untuk menyintesis silika berpori. Daerah asal sekam serta proses leaching khususnya suhu dan waktu untuk mengekstraksi silika dapat memengaruhi kualitas silika. Penelitian ini bertujuan untuk mengkaji pengaruh geokimia daerah asal sekam serta kondisi suhu dan waktu leaching terhadap kualitas silika yang dihasilkan, yang selanjutnya disintesis menjadi silika berpori. Sekam yang digunakan berasal dari Trenggalek dan Gorontalo yang kemudian di leaching dengan variasi kondisi RT-24 dan 80-03 dilanjutkan dengan kalsinasi 600ºC. Kemudian, sekam dileaching kedua dengan variasi yang sama, ekstraksi alkali, dan dilanjutkan dengan metode sol-gel. Silika berpori disintesis menggunakan surfaktan CTAB sebagai agen pengarah struktur. Hasil analisis X-Ray Fluorescence (XRF) menunjukkan bahwa komposisi Si meningkat setelah leaching dengan hasil 95,33-97,78 at%. Fourier Transform Infrared Spectroscopy (FTIR) menunjukkan gugus fungsi dari Si-O, Si-O-H, Si-O-Si, dan -OH. Pola X-Ray Diffraction (XRD) menunjukkan bahwa silika memiliki struktur amorf yang diindikasikan oleh pelebaran puncak pada 2θ = 22,6º, namun pada sampel 80-03 terdapat puncak kristalin pada 2θ = 37,8º dan 44º yang sebagian besar cocok dengan fase aluminium fosfat (AlPO4) dengan FoM 0,93-0,94. Scanning Electron Microscopy menunjukkan morfologi campuran berupa agregat bola dan spons. Secara keseluruhan, sintesis silika berpori berhasil dilakukan namun masih belum sepenuhnya memenuhi kriteria struktural silika mesopori MCM-41 yang diharapkan.
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Rice husks contain 80–97% silica, this biomass waste has the potential to serve as a silica precursor for synthesizing porous silica. The origin of the rice husks and the leaching process, particularly the temperature and duration used to extract the silica can affect the quality of the silica. Therefore, this study aims to examine the effects of the husk’s region of origin, as well as leaching temperature and time, on the quality of the resulting silica, which is subsequently synthesized into porous silica. The rice husks used were sourced from Trenggalek and Gorontalo and were leached under varying conditions (RT-24 and 80-03), followed by calcination at 600°C. The rice husks were then subjected to a second leaching under the same conditions, followed by alkali extraction and the sol-gel method. Porous silica was synthesized using the surfactant CTAB as a structure-directing agent. X-ray fluorescence (XRF) analysis results showed that the Si content increased after leaching, ranging from 95.33 to 97.78 at%. Fourier Transform Infrared Spectroscopy (FTIR) revealed functional groups including Si-O, Si-O-H, Si-O-Si, and -OH. The X-ray Diffraction (XRD) pattern indicated that the silica had an amorphous structure, as evidenced by the broadening of the peak at 2θ = 22.6°, however, in sample 80-03, crystalline peaks were observed at 2θ = 37.8° and 44°, which largely correspond to the aluminum phosphate (AlPO₄) phase with a FoM of 0.93–0.94. Scanning electron microscopy reveals a mixture consisting of spherical aggregates and sponge-like structures. Overall, the synthesis of porous silica was successful, but it still does not fully meet the expected structural criteria for MCM-41 mesoporous silica.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	MCM-41, mesoporous, rice husk, silica, sekam padi, silika, mesopori, MCM-41
Subjects:	Q Science > QC Physics > QC585.75.S55 Silica
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Syahrul Saharudin Buhungo
Date Deposited:	04 Aug 2026 01:36
Last Modified:	04 Aug 2026 01:36
URI:	http://repository.its.ac.id/id/eprint/142569

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