SINTESIS Fe3O4/TiO2-Ag DAN UJI AKTIVITASNYA SEBAGAI FOTOKATALIS

FADLIAN NOOR, Dr. Eko Sri Kunarti, M.Si; Prof. Dr. Bambang Rusdiarso, DEA

2019 | Skripsi | S1 KIMIA

Sintesis fotokatalis Fe3O4/TiO2-Ag telah berhasil dilakukan. Sintesis dilakukan secara bertahap yaitu sintesis Fe3O4 menggunakan metode sono-kopresipitasi, kemudian pelapisan TiO2 melalui proses sol-gel, dan dilanjutkan modifikasi permukaan TiO2 dengan nanopartikel perak (Ag). Hasil sintesis material dikarakterisasi dengan spektrofotometri Fourier Transform Infrared (FT-IR), X-Ray Diffraction (X-RD), Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX), Transmission Electron Microscopy (TEM), Specular Reflectance Ultra Violet-Visible (SR UV-Vis) spectrophotometry. Pengujian aktivitas fotokatalis Fe3O4/TiO2-Ag untuk degradasi metilen biru dalam air dilakukan melalui sistem batch dalam reaktor tertutup pada paparan sinar UV dan tampak. Hasil penelitian menunjukkan bahwa material fotokatalis Fe3O4/TiO2-Ag berbentuk partikel bulat dengan ukuran partikel sebesar 12,3 nm dan responsif pada daerah serapan sinar tampak. Nilai Energi celah pita fotokatalis Fe3O4/TiO2-Ag dengan rasio berat Ag/TiO2 0, 1, 3, 5, dan 8 % secara berturut-turut sebesar 3,11; 2,93; 2,88; 2,82; 3,02 eV. Degradasi metilen biru dalam air 5 ppm terkatalisis 5 mg Fe3O4/TiO2-Ag 5 % pada pH 10 dan waktu reaksi 120 menit sebesar 73,3 dan 34,2% berturut-turut pada paparan sinar tampak dan UV

Synthesis of Fe3O4/TiO2-Ag photocatalyst has been performed. The synthesis was carried out in several stages; synthesis of Fe3O4 by sono-coprecipitation method, next coating TiO2 by sol-gel proccess, then modification of the surface TiO2 by nanoparticle silver (Ag). The characterization was conducted by infrared spectrophotometry, X-Ray Diffraction (X-RD), Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX), Transmission Electron Microscopy (TEM), Specular Reflectance Ultra Violet-Visible (SR UV-Vis) spectrophotometry. The activity test of Fe3O4/TiO2-Ag photocatalyst was evaluated by batch system for degradation methylene blue in water on using closed reactor with UV and visible irradiation. The result showed that Fe3O4/TiO2-Ag photocatalyst shaped sphere particle with a size of 12.3 nm and enhanced under visible light absorption. The band gap energy of Fe3O4/TiO2-Ag photocatalyst with Ag/TiO2 weight ratio of 0, 1, 3, 5, and 8% were: 3.11; 2.93; 2.88; 2.82; 3.02 eV, respectively. Degradation of methylene blue solution 5 ppm catalyzed by 5 mg Fe3O4/TiO2-Ag 5% at a pH of 10 and with the reaction time of 120 minutes gave the percentage of degradation were 73.3 and 34.2 % under visible and ultraviolet irradiation, respectively.

Kata Kunci : fotokatalis, metilen biru, perak, TiO2