Reduction of Peroxide Value and Free Fatty Acid Value of Used Frying Oil Using TiO2 Thin Film Photocatalyst

Abstract

<p>The quality of used frying oil degraded due to the presence of products degradation, such as; PV and FFA which formed during the frying process. PV and FFA are harmful to human health. The photocatalytic activity of TiO₂ thin film has been applied in various fields, especially in the environment. The aim of this study is to evaluate photocatalytic activity of TiO₂ thin film for reducing PV and FFA in used frying oil. The TiO₂ thin films were deposited on glass substrate by spray coating method at a temperature of 450 ^oC. The TiO₂ precursor solution was prepared by mixing TTiP, AcAc, and ethanol. The thin films were varied into two conditions; as-deposited and annealed at a temperature of 500 ^oC. The morphology, crystalline structure, and optical properties of the thin films were characterized <span style="language: id; mso-ansi-language: id; mso-fareast-language: ko;" lang="id">by scanning electron microscope (SEM), X-ray </span> Diffraction (XRD), and UV-VIS spectrophotometer, respectively. The photocatalytic process was carried out by putting TiO₂ thin film in used frying oil and irradiated by sunlight. The result showed that both of TiO₂ thin films were still amorphous in nature. However, there was a peak with low intensity for annealed TiO₂ thin film which corresponding to the TiO₂anatase crystals plane of (101). Annealing process improved crystallinity and changed the shape morphology of TiO₂ thin films. The band gap was found to be 3.59 eV for as-deposited TiO₂ thin film and 3.49 eV for the annealed-TiO₂ thin film. The photocatalytic process shows that TiO₂ thin films reduced FFA and PV of used frying oil up to 67.10% and 79.15%, respectively. Photocatalytic activity of annealed TiO₂ thin film was higher than as-deposited TiO₂ thin film. The results indicated that TiO₂ thin film photocatalyst potential as the new alternative method to purify used frying oil. Copyright © 2016 BCREC GROUP. All rights reserved</p><p><em>Received: 23^rd January 2016; Revised: 17^th April 2016; Accepted: 7^th June 2016</em></p><p><strong>How to Cite:</strong> Kaltsum, U., Kurniawan, A.F., Nurhasanah, I., Priyono, P. (2016). Reduction of Peroxide Value and Free Fatty Acid Value of Used Frying Oil Using TiO₂ Thin Film Photocatalyst. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 11 (3): 369-375 (doi:10.9767/bcrec.11.3.577.369-375)</p><p><strong>Permalink/DOI:</strong> <a href="http://doi.org/10.9767/bcrec.11.3.577.369-375">http://doi.org/10.9767/bcrec.11.3.577.369-375</a></p>