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All Journal MASALIQ: Jurnal Pendidikan dan Sains
Nada, Afdila
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Religion Education Social Sciences

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Sintesis Berkelanjutan Silika Xerogel (SiO2) dari fly ash: Optimasi Konsentrasi NaOH dan Waktu Aging menggunakan RSM Arpy, Alifea; Nasra, Edi; Gemasih, M.Iqbal Saputra; Nada, Afdila
MASALIQ Vol 6 No 1 (2026): JANUARI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i1.8895

Abstract

Response Surface Methodology (RSM) was used to optimize the synthesis of silica xerogel from fly ash by evaluating the effects of NaOH concentration and aging time on xerogel mass as the main response. This study aimed to develop a statistical model capable of predicting and optimizing the process conditions for the synthesis of fly ash–based silica xerogel. A Central Composite Design (CCD) with 14 runs was applied to construct a quadratic regression model and analyze the relationships among process conditions. The statistical analysis showed that the quadratic model was significant (p < 0.05), with a coefficient of determination (R²) of 0.7515, indicating good agreement between the model predictions and the experimental data. The quadratic factors of NaOH concentration and aging time had significant effects on the response, indicating a nonlinear relationship and the presence of an optimum region, which was visualized through response surface and contour plots. Numerical optimization identified optimum conditions at an NaOH concentration of 8.5 M and an aging time of 17.89 hours, yielding a predicted xerogel mass of 0.388 g with a desirability value of 0.891. Confirmation tests demonstrated good agreement between the experimental results and model predictions, thereby confirming the effectiveness of RSM in optimizing the synthesis of silica xerogel from fly ash.
Sintesis dan Karakterisasi Silika Xerogel dari Abu Cangkang Sawit serta Penentuan Luas Permukaannya Menggunakan Metode Adsorpsi Metilen Biru Nada, Afdila; Arpy, Alifea; Tsagifa, Faiqa Haura; Nasra, Edi; Gemasih, M.Iqbal Saputra
MASALIQ Vol 6 No 1 (2026): JANUARI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i1.8940

Abstract

Silica xerogel is a porous material with a high surface area and active silanol and siloxane groups, making it a promising candidate for use as an adsorbent material. This study aimed to synthesize silica xerogel from palm shell ash as an alternative silica source, characterize its functional groups, and determine its surface area using the methylene blue adsorption method. Silica xerogel was synthesized via a sol–gel method followed by a drying process to obtain the xerogel. Functional group characterization was carried out using Fourier Transform Infrared Spectroscopy (FTIR), while the surface area was determined based on methylene blue adsorption analyzed using UV–Vis absorbance data. The results showed that the synthesized silica xerogel possessed characteristic silica functional groups, namely siloxane (Si–O–Si) and silanol (Si–OH). The methylene blue adsorption process showed a decrease in concentration from 25.7912 mg/L to 2.06 mg/L, with an adsorption efficiency of 92%, an adsorption capacity of 5.9328 mg/g, and a silica xerogel surface area of 21.96032 m²/g. These findings indicate that silica xerogel synthesized from palm shell ash has surface characteristics that support the adsorption of cationic dyes and has potential for use as a biomass waste-based adsorbent material.
Co-Authors Arpy, Alifea Edi Nasra Gemasih, M.Iqbal Saputra Tsagifa, Faiqa Haura