A Comparison of TiO2 Thin Film Photocatalyst using Sunlight and UV Light in Reducing Free Fatty Acid and Peroxide Value of Used Frying Oil

  • Ummi Kaltsum Universitas PGRI Semarang, Indonesia
  • Affandi Faisal Kurniawan Universitas PGRI Semarang, Indonesia
  • Priyono Priyono Universitas Diponegoro, Indonesia
  • Iis Nurhasanah Universitas Diponegoro, Indonesia


Used frying oil contains more degradation products, such asfree fatty acid (FFA) andperoxide value (PV), which produced during frying process. The aim of this study is to compare TiO2 thin film photocatalyst inreducing FFA and PV using sunlight and ultraviolet (UV) light. TheTiO2thin film was deposited on glass subtratre at temperature of 450oCusing spray coating method. TTiP 0.4 M, AcAc 0.2 M, and ethanol were used as precursor solution. The morphology, crystalline structure, and optical properties of TiO2 thin film were analyzed by scanning electron microscope (SEM), x- ray diffractometer (XRD), and UV-VISspectrophotometer, respectively. The TiO2 thin films were placed in box glass contains used frying oil and irradiated by sunlight and UVlight. The result showed that FFA and PV of used frying oil reduced up to 49.09% and 20.96%,respectively under sunlightirradiation.  On the other hand, the FFA and PV of used frying oil reduced up to 61.81% and53.22%, respectively under UV lightirradiation. The photocatalyst of TiO2 thin film under UV irradiation is more effective for reducing degradation products of used frying oil.