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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Dasar POSITRON Proceeding Seminar LPPM UMP Tahun 2014 Indonesian Journal of Chemical Science Indonesian Journal of Chemistry Martabe : Jurnal Pengabdian Kepada Masyarakat Jurnal Kartika Kimia PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat Agritech: Jurnal Fakultas Pertanian Universitas Muhammadiyah Purwokerto Jurnal Pengabdian Masyarakat Bumi Raflesia Abdimas Galuh: Jurnal Pengabdian Kepada Masyarakat Proceedings Series on Physical & Formal Sciences Prosiding Seminar Nasional Hasil-hasil Penelitian dan Pengabdian Pada Masyarakat
Anis Shofiyani
Universitas Muhammadiyah Purwokerto
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Journal : JURNAL KIMIA SAINS DAN APLIKASI

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Synthesis of Hydrophobic Silica Xerogel from Fly Ash for Oil–in–Water Adsorption Hanifah, Ummi; Shofiyani, Anis; Gusrizal, Gusrizal
Jurnal Kimia Sains dan Aplikasi Vol 28, No 5 (2025): Volume 28 Issue 5 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.5.235-243

Abstract

In this study, silica xerogel was synthesized from coal fly ash modified with trimethylchlorosilane (TMCS) reagent to increase the hydrophobicity of the material. TMCS-modified silica xerogel was then used for oil adsorption in water. Silica xerogel was synthesized using the sol-gel method with sodium silicate from fly ash as a precursor and citric acid as a catalyst. The sol-gel process involves sequential steps of hydrolysis and condensation, followed by gelation (the sol-to-gel transition) and aging. Surface modification of the resulting silica xerogel was conducted using TMCS in a mixture of methanol and petroleum benzine, with volume ratios of TMCS:methanol:petroleum benzine set at 0:1:1, 1:1:1, 2:1:1, and 3:1:1. The synthesized silica xerogel was characterized using FTIR spectroscopy, SEM, GSA, and contact angle measurements to evaluate its hydrophobicity. FTIR spectrophotometry results revealed that silica modified with TMCS exhibited absorption bands corresponding to Si–CH3 groups at 843.20, 845.69, and 843.18 cm-1. These findings indicate the successful formation of silyl groups on the surface of the silica xerogel when using TMCS:methanol:phosphate buffer (PB) ratios of 0:1:1, 1:1:1, 2:1:1, and 3:1:1. SEM analysis revealed that the surface morphology of the synthesized silica xerogel exhibited a porous structure with a mesoporous pore size distribution. Based on the experimental results, it can be concluded that surface modification with TMCS enhances the hydrophobicity of the silica xerogel. An increase in TMCS volume led to a corresponding increase in hydrophobicity. The hydrophobic silica xerogel demonstrated a good adsorption capacity for oil in water, ranging from 6 to 22 mg/g, with the adsorption capacity increasing in accordance with the degree of hydrophobicity.
Co-Authors Abdul Aziz Agus Mulyadi Purnawanto Agus Mulyadi Purnawanto Ajuk Sapar Akhmad Fauzan Alimunddin, Andi Hairil Aman Suyadi Andi Hairil Alimuddin Ari Widiyantoro Chitra, Fara Endah Sayekti Eviva, Nur Fani Indriani, Fani Gayuh Prasetyo Budi Gusrizal Gusrizal Hadi Pramono Hamami Alfasani Dewanto Haryanto, Totok Heni Pujiastuti Hermin Endratno Indriani, Resti Dwi Jefri Sasongko Lestari, Titiek Liza Pratikna Mulyadi P, Agus Mulyadi Purnawanto, Agus Nelly Wahyuni Neni Damajanti, Neni Oetami Dwi Hajoeningtijas Paulina, Erni Putri, Alintianni Yolla Rahayu, Warsi Kurnia Rahmiyati, Yusnita Rakhmawati, Fitri Ratnasari, Popon Reza Zahara Reza Zahara Abdul Aziz Risa Nofiani Rostaman Rudiyansyah Rudiyansyah Rudiyansyah, R. Syaukany, Rizza Faris Teguh Pribadi Thamrin Usman Titin Anita Zahara, Titin Anita Ummi Hanifah Virza Carmelita Wibowo, M. Agus Wibowo, Muhamad Agus Widiyananta, Surya Winda Rahmalia Yohana Sutiknyawati Kusuma Dewi Zaharah, Titin Anita ‘Aisy, Kamelia Eka Rohadatul