Sintesis Co-doped ZrO2 Sebagai Model Fotokatalis Responsif Sinar Tampak dengan Variasi Konsentrasi Co(NO3)2.6H2O dan Suhu Kalsinasi

MONALISA CHINTYA R, Akhmad Syoufian, S.Si., Ph.D.; Prof. Dra. Wega Trisunaryanti, M.S., Ph.D.Eng.

2018 | Skripsi | S1 KIMIA

Sintesis Co-doped ZrO2 sebagai model fotokatalis responsif sinar tampak dengan variasi konsentrasi Co(NO3)2.6H2O dan suhu kalsinasi telah dilakukan. Penelitian ini bertujuan untuk melakukan sintesis Co-doped ZrO2 sebagai model fotokatalis responsif sinar tampak dan memperoleh pengaruh variasi konsentrasi dopan Co(NO3)2.6H2O dan suhu kalsinasi terhadap karakter Co-doped ZrO2. Penelitian diawali dengan sintesis ZrO2 dan Co(NO3)2.6H2O konsentrasi 1, 3, 5, 7 dan 9% (b/b) dengan metode refluks, kemudian material yang diperoleh dikalsinasi pada suhu 500, 600, 700, 800, 900, dan 1000 derajat C selama 4 jam sehingga diperoleh serbuk Co-doped ZrO2. Hasil sintesis dikarakterisasi dengan X-Ray Difractometer (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), Fourrier Transform Infrared (FTIR), dan spektrofotometer Specular Reflectance UV-Vis (SR-UV). Hasil karakterisasi menggunakan XRD menunjukkan bahwa sampel hasil sintesis didominasi Co-doped ZrO2 fase monoklinik dengan ukuran kristal sekitar 45,70-74,82 nm. Karakterisasi menggunakan EDX membuktikan bahwa dopan Co telah berhasil terdoping ke permukaan ZrO2 dengan komposisi sebesar 0,26% yang ditandai dengan penurunan intensitas serapan spektra FTIR pada bilangan gelombang 400-700 cm-1 karena terganggunya kestabilan ikatan Zr-O-Zr. Berdasarkan karakterisasi menggunakan SR-UV, Co-doped ZrO2 hasil sintesis memiliki rentang nilai Eg sebesar 2,85-3,28 eV dengan panjang gelombang sekitar 377,87-434,80 nm. Sampel Co-doped ZrO2 diketahui memiliki responsivitas yang optimum terhadap sinar tampak dengan penambahan konsentrasi Co 3% pada suhu kalsinasi 900 derajat C.

Synthesis of Co-doped ZrO2 as a model of visible light responsive photocatalyst with various concentrations of Co(NO3)2.6H2O and calcination temperatures have been performed. This research aims to synthesize Co-doped ZrO2 as a model of visible light responsive photocatalyst and to obtain the effect of various concentrations of dopant Co(NO3)2.6H2O and calcination temperatures on Co-doped ZrO2 character. The research was initiated with the synthesis of ZrO2 and various concentrations of 1, 3, 5, 7 and 9% (w/w) Co(NO3)2.6H2O by reflux method, then the obtained materials were calcined at 500, 600, 700, 800, 900, and 1000 degree C for 4 hours to obtain Co-doped ZrO2 powder. The synthesis results were characterized with X-Ray Difractometer (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), Fourrier Transform Infrared (FTIR), and Specular Reflectance UV-Vis (SR-UV) spectrophotometer. The characterization results using XRD showed that the synthesized sample was dominated by the monoclinic phase of Co-doped ZrO2 with the crystal size about 45.70-74.82 nm. Characterization using EDX proves that Co dopant has been successfully doped to ZrO2 surface with a composition of 0.26% which is characterized by a decrease in the absorption intensity of FTIR spectra at wave numbers 400-700 cm-1 due to disruption the stability of Zr-O-Zr bonds. Based on the characterization using SR-UV, the synthesized Co-doped ZrO2 has an Eg value range of 2.85-3.28 eV with a wavelength of around 377.87-434.80 nm. Co-doped ZrO2 samples were known to have optimum responsiveness to visible light with the addition of Co concentration of 3% at a calcination temperature of 900 degree C.

Kata Kunci : Co-doped ZrO2, konsentrasi dopan, fotokatalis, metode refluks, suhu kalsinasi