PENGARUH KONSENTRASI FeSO4.7H2O DAN SUHU KALSINASI PADA SINTESIS Fe-DOPED ZrO2 SEBAGAI MODEL FOTOKATALIS RESPONSIF SINAR TAMPAK

BULAN WENING R A, M. Fajar Pradipta, S.Si., M.Eng; Akhmad Syoufian, S.Si., Ph.D.

2017 | Skripsi | S1 KIMIA

Sintesis dan karakterisasi Fe-doped ZrO2 sebagai model fotokatalis responsif sinar tampak telah berhasil dilakukan. Tujuan dari penelitian ini adalah mempelajari pengaruh variasi konsentrasi Fe sebagai dopan dan pengaruh variasi suhu kalsinasi untuk menghasilkan material Fe-doped ZrO2 yang responsif terhadap sinar tampak. Penelitian ini diawali dengan mereaksikan ZrO2 dan garam FeSO4•7H2O dengan variasi konsentrasi 1, 3, 5, 7 dan 9% (b/v) menggunakan metode refluks lalu dikalsinasi pada variasi suhu 700, 800 dan 900 °C. Sampel kemudian dikarakterisasi menggunakan difraktometer sinar-X (XRD), spektrofotometer Fourier Transform Infra Red (FT-IR), spektrofotometer fluoresensi sinar-X (XRF) dan spektrofotometer Diffuse Reflectance UV-Visible (DR-UV). Hasil karakterisasi menunjukkan bahwa material Fe-doped ZrO2 didominasi oleh fase kristal monoklinik dengan ukuran kristal rata-rata 24,21 nm. Sampel hasil sintesis memiliki nilai energi celah pita (Eg) dengan rentang nilai sebesar 2,88-3,26 eV. Penurunan nilai Eg diketahui mencapai kondisi optimum pada penambahan Fe sebanyak 3% (b/v) untuk setiap variasi suhu kalsinasi. Sampel Fe-doped ZrO2 3% (b/v) yang dikalsinasi pada suhu 900 °C memiliki Eg terendah sebesar 2,88 eV dengan panjang gelombang serapan 431 nm.

Synthesis and characterization of Fe-doped ZrO2 as a model of visible light responsive photocatalyst have been conducted. The purpose of this research were synthesizing the Fe-doped ZrO2 as a model of visible light responsive photocatalyst material, studying the effect of various concentrations on the addition of Fe as a dopant and studying the effect of various temperature used in calcination process. This research was initiated by the reaction of ZrO2 with FeSO4•7H2O in various concentrations 1, 3, 5, 7 and 9% (w/v) using reflux method. Then the product calcinated in various calcination temperature 700, 800 and 900 °C. All samples were characterized with X-ray Diffractometer (XRD), Fourier Transform Infrared Spectrophotometer (FT-IR), X-ray Fluorescence Spectrophotometer (XRF) and Diffuse Reflectance UV-Visible Spectrophotometer (DR-UV). The results showed that the Fe-doped ZrO2 material was dominated by monoclinic crystalline phase with average crystal size of 24.21 nm. Synthesized samples have a band gap energy (Eg) in the range of 2.88-3.26 eV. It has been known that Eg impairment will achieve the optimum conditions on the addition of Fe 3% (w/v) for every variation of calcination temperature. Fe-doped ZrO2 3% (w/v) sample calcined at 900 °C was known to have the lowest Eg 2.88 eV with a wavelength absorption at 431 nm.

Kata Kunci : Ferrous sulfate heptahydrate, Photocatalyst, Calcination, Zirconia