PREPARASI TiO2-TERSENSITIFKAN AgCl DENGAN TEKNIK REFLUKS DALAM SUASANA ASAM DAN KARAKTERISASINYA

Ratna Novita Sari; Hari Sutrisno

Ratna Novita Sari Jurusan Pendidikan Kimia, FMIPA, Universitas Negeri Yogyakarta, Jl. Colombo No. 1, Kampus Karangmalang Yogyakarta 55281, Indonesia
Hari Sutrisno Jurusan Pendidikan Kimia, FMIPA, Universitas Negeri Yogyakarta, Jl. Colombo No. 1, Kampus Karangmalang Yogyakarta 55281, Indonesia

Abstract

ABSTRAK: Titanium dioksida (TiO₂)-tersensitifkan variasi prosen berat AgCl (TiO₂@AgCl): 0; 1,3; 3,4; 8,3 dan 15,2% dihasilkan dalam suasana asam. Material TiO₂@AgCl dipreparasi dari reaksi emulsi TiO₂(rutile)-teradsorpsikan ion Cl^-, AgNO₃, dan HNO₃ dengan teknik refluks pada temperatur 150^oC selama 6 jam. Keberadaan AgCl sebagai sensitiser terbentuk dari reaksi ion Cl^- yang terabsorbsi pada permukaan TiO₂(rutile) dengan ion Ag⁺ yang berasal dari larutan AgNO₃. Sampel TiO₂@AgCl yang berisi variasi % berat AgCl: 0; 1,3; 3,4; 8,3 dan 15,2% diperoleh dari reaksi TiO₂(rutile) teradsorpsi ion Cl^- dengan variasi % berat perak (Ag): 0; 1,5; 3; 6 dan 9% yang berasal dari AgNO₃. Semua TiO₂@AgCl yang dihasilkan dikarakterisasi dengan X-Ray Diffraction (XRD) dan Spektrofotometer UV-Vis Diffuse Reflectance. Dalam semua sampel (TiO₂@AgCl) mengandung anatase (minor), AgCl (minor) dan rutile (major), kecuali pada TiO₂ tanpa AgCl hanya berisi anatase (minor) dan rutile (major). Energi celah pita (Eg) sampel TiO₂@AgCl pada prosen berat AgCl: 1,3; 3,4; 8,3 dan 15,2% secara berturut-turut: 3,24; 3,00; 3,09 dan 2,95 eV, sedangkan pada TiO₂ tanpa AgCl sebesar 3,05 eV. Ukuran kristal masing-masing fasa dalam TiO2@AgCl yaitu sekitar 5-9 nm untuk fasa anatase, 9-11 nm untuk fasa rutile dan 37-60 nm untuk fasa AgCl.

Kata Kunci: pensensitif anorganik, teknik refluks, energi celah pita

ABSTRACT: Titanium dioxide (TiO₂) sensitized AgCl variations in weight percent (wt%) (TiO₂@AgCl): 0; 1.3; 3.4; 8.3 and 15.2% were obtained on the acidic conditions (pH»2). Materials of TiO₂@AgCl were obtained from the reaction of TiO₂(rutile) adsorbed Cl^- ions, AgNO₃, and HNO₃ via reflux technique at temperatures of 150^oC for 6 hours. The existence of AgCl as sensitiser formed from the reaction of Cl^-ions are absorbed on the surface of TiO₂(rutile) with Ag⁺ ions originating from AgNO₃ solution. Samples of TiO₂@AgCl that contain variations wt% AgCl: 0; 1.3; 3.4; 8.3 and 15.2% was obtained from the reaction of TiO₂(rutile) adsorbed Cl^- ions at variation wt% of silver (Ag): 0; 1.5; 3; 6 and 9% originating from AgNO₃. All of TiO₂@AgCl were characterized by X-Ray Diffraction (XRD) and UV-Vis Spectrophotometer Diffuse Reflectance. In all samples (TiO₂@AgCl) contains anatase (minor), AgCl (minor) and rutile (major), except on TiO₂ without AgCl only contain anatase (minor) and rutile (major). Band gap (Eg) of TiO₂@AgCl at AgCl variations in wt%: 1.3; 3.4; 8.3 and 15.2% is 3.24; 3.00; 3.09 and 2.95 eV respectively, whereas the band gap of TiO₂without AgCl is 3.05 eV. The size of each crystal phase on TiO₂@AgCl is about 5-9 nm for the anatase phase, 9-11 nm for the rutile phase and 37-60 nm for AgCl phase.

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