SINTESIS Fe-DOPED ZrO2 SEBAGAI MODEL FOTOKATALIS RESPONSIF SINAR TAMPAK MENGGUNAKAN VARIASI KONSENTRASI GARAM FeSO4.7H2O DAN SUHU KALSINASI

BAWESTI LAKSTIARINI, Akhmad Syoufian, S.Si., Ph. D.; Prof. Dr. A.H. Bambang Setiaji

2018 | Skripsi | S1 KIMIA

Sintesis dan karakterisasi Fe-doped ZrO2 sebagai model fotokatalis responsif sinar tampak telah dilakukan. Dalam penelitian ini dipelajari karakter Fe-doped ZrO2 hasil sintesis dengan metode refluks, pengaruh variasi konsentrasi FeSO4.7H2O sebagai dopan dan pengaruh suhu kalsinasi pada sintesis Fe-doped ZrO2 sebagai model fotokatalis responsif sinar tampak yang ditandai dengan menurunnya energi celah pita (Eg). Penelitian ini diawali dengan mereaksikan ZrO2 dan garam FeSO4.7H2O dengan variasi konsentrasi 1, 3, 5, 7 dan 9% (b/b) menggunakan metode refluks kemudian dikalsinasi pada suhu 500, 600, 700, 800, 900 dan 1000 derajat Celcius. Sampel yang diperoleh kemudian dikarakterisasi menggunakan spektrofotometer difraktometer sinar-X (XRD), Scanning Electron Microscopy with Energy Dispersive X-Ray (SEM EDX), spektrofometer Fourier Transform Infrared (FT-IR), dan spektrofotometer Specular Reflectance UV-Visible (SR-UV). Hasil analisis XRD menunjukkan bahwa material Fe-doped ZrO2 seluruhnya fase kristal monoklinik dan intensitas serapannya semakin menurun seiring dengan penambahan dopan Fe. Ukuran kristal Fe-doped ZrO2 rata-rata sebesar 55,75 nm. Keberadaan Fe terkonfirmasi dari data EDX dengan diperoleh komposisi Fe, Zr, dan O sebesar 0,60; 70,75; dan 28,65%. Hasil spektra IR menunjukkan terjadi pergeseran puncak ke arah bilangan gelombang yang lebih kecil pada bilangan gelombang 400-750 cm-1 yang mengindikasikan keberadaan Fe telah mengganggu ikatan Zr-O-Zr. Analisis dengan SR-UV menunjukkan penurunan optimum material Fe-doped ZrO2 pada konsentrasi 7% (b/b) dengan nilai Eg sebesar 2,94 eV dan 2,96 eV pada suhu kalsinasi 500 dan 1000 derajat Celcius.

Synthesis and characterization of Fe-doped ZrO2 as a model of visible-light responsive photocatalyst have been conducted. The purpose of this research were to study the character of Fe-doped ZrO2 by reflux method, to study the effect of various concentrations on the addition of FeSO4.7H2O as a dopant and the effect temperature used in calcination process on its responsiveness under visible-light characterized by decreasing bandgap energy (Eg). This research was initiated by the reaction of ZrO2 and various concentrations of 1, 3, 5, 7, and 9% (w/w) of FeSO4.7H2O using reflux method and the product was calcinated at various temperatures 500, 600, 700, 800, 900 and 1000 degree Celcius. All samples were characterized with X-Ray Diffractometer (XRD), Scanning Electron Microscopy with Energy Dispersive X-Ray (SEM EDX), Fourier Transform Infrared spectrophotometry (FT-IR), and Specular Reflectance UV-Visible spectrophotometry (SR-UV). The XRD results showed that the Fe-doped ZrO2 material was monoclinic crystalline phase and its absorption intensity decreased along with the addition of Fe as a dopant. The average crystal size of Fe-doped ZrO2 was 55.75 nm. The presence of Fe was confirmed from EDX, that is Fe-doped ZrO2 contains 0.60% of Fe, 70.75% of Zr, and 28.65% of O. IR spectra of the synthesized materials showed a reducing absorption on 400-750 cm-1, indicating that the presence of Fe has disrupted the Zr-O-Zr bond. SR-UV showed that the optimum decrease of Eg (band gap energy) was formed on Fe-doped ZrO2 concentration of 7%, giving an Eg value of 2.94 eV and 2.96 eV at calcination temperatures of 500 and 1000 degree Celcius, respectively.

Kata Kunci : Eg, Fe-doped ZrO2, Fotokatalis, Zirkonia