SINTESIS Zn-DOPED ZrTiO4 DENGAN VARIASI KONSENTRASI ZnCl2 DAN SUHU KALSINASI SEBAGAI MODEL FOTOKATALIS RESPONSIF SINAR TAMPAK

Azizia Alifi, Dr. Akhmad Syoufian, S.Si ; Prof. Dr.rer.nat. Karna Wijaya, M.Eng

2019 | Skripsi | S1 KIMIA

Sintesis dan karakterisasi Zn-doped ZrTiO4 sebagai model fotokatalis responsif sinar tampak telah dilakukan. Penelitian ini bertujuan untuk melakukan sintesis material Zn-doped ZrTiO4 menggunakan metode sol-gel, serta mengkaji pengaruh konsentrasi ZnCl2 dan suhu kalsinasi terhadap karakter Zn-doped ZrTiO4 hasil sintesis. Prekursor titanium tetraisopropoksida (TTIP) yang dilarutkan ke dalam etanol direaksikan dengan suspensi ZrO2 yang mengandung 1, 3, 5, 7, dan 9 persen (b/b Ti) dopan zink dari garam ZnCl2. Material dengan konsentrasi ZnCl2 optimum kemudian dikalsinasi dengan variasi suhu 500, 700, dan 900 derajatC. Seluruh sampel kemudian dikarakterisasi menggunakan X-Ray Diffractometer (XRD), Scanning Electron Microscopy dengan Energy Dispersive X-Ray (SEM-EDX), Fourier Transform Infrared Spectrophotometer (FT-IR) dan Specular Reflectance UV-Visible Spectrophotometer (SR-UV). Hasil penelitian menunjukkan material Zn-doped ZrTiO4 telah berhasil disintesis. Hasil analisis XRD menunjukkan kestabilan termal yang lebih baik pada Zn-doped ZrTiO4 dibandingkan dengan Zn-doped TiO2 jika dilihat dari proses perubahan fasa anatas ke rutil. Hasil SEM-EDX menunjukkan komposisi unsur Zr sebesar 31,16persen, O sebesar 41,51persen, Ti sebesar 26,39persen, dan Zn sebesar 0,95persen. Spektra FTIR menunjukkan perubahan intensitas ikatan Ti-O-Ti. Analisis SRUV menunjukkan penurunan nilai Eg yang paling optimum pada konsentrasi 5persen (b/b) dari ZnCl2 dengan suhu kalsinasi 900 derajatC. Nilai Eg optimum yaitu sebesar 2,87 eV pada panjang gelombang sinar tampak 432,37 nm.

Synthesis and characterization of Zn-doped ZrTiO4 as a model of visible light-responsive photocatalyst have been conducted. The main purpose of this research was to get Zn-doped ZrTiO4 materials through sol-gel method and to learn the effect of concentration of ZnCl2 and calcination temperature to Zn-doped ZrTiO4 synthesis product. Titanium tetraisopropoxide (TTIP) was added into ethanol and mixed by the ZrO2 suspension which contained 1, 3, 5, 7 and 9percent (w/w Ti) of zinc dopant from ZnCl2 salts. The materials with optimum concentration of ZnCl2 was calcined with various calcination temperatures 500, 700, and 900 degreeC. Prepared photocatalyst were characterized by using X-Ray Diffractometer (XRD), Scanning Electron Microscopy with Energy Dispersive X-Ray (SEM-EDX), Fourier Transform Infrared Spectrophotometer (FT-IR) and Specular Reflectance UV-Visible Spectrophotometer (SR-UV). The results showed that the Zn-doped ZrTiO4 materials was successfully synthesized. The XRD results showed that the character of Zn-doped ZrTiO4 has better thermal stability than Zn-doped TiO2 analyzed from the transformation phase of anatase to rutile. SEM-EDX results showed the compositon of Zr 31.16percent, O 41.51percent, Ti 26.39percent, and Zn 0.95percent. FTIR spectra showed changes in intensity of Ti-O-Ti vibration in Zn-doped ZrTiO4. SRUV showed that the optimum of bandgap energy (Eg) was on 5percent of Zn dopant at a temperature 900 degreeC. The optimum band gap was 2.87 eV in the visible light wavelegth absorption at 432.37 nm.

Kata Kunci : fotokatalis , sol-gel , titania , zink , zirkonia