SINTESIS KOMPOSIT Fe3O4/SiO2/TiO2 TERSENSITISASI POLIANILIN SEBAGAI FOTOKATALIS UNTUK REDUKSI ION Ag(I)

SAIFUDDIN AZIZ, Dr. Eko Sri Kunarti, M.Si; Prof. Dr. Bambang Rusdiarso, DEA

2017 | Skripsi | S1 KIMIA

Sintesis komposit Fe3O4/SiO2/TiO2 tersensitisasi polianilin (PANI) telah dilakukan. Penelitian ini bertujuan melakukan sintesis dan uji aktivitas Fe3O4/SiO2/TiO2 tersensitisasi polianilin. Sintesis komposit Fe3O4/SiO2/TiO2 tersensitisasi polianilin dilakukan secara bertahap yaitu sintesis Fe3O4 dengan metode sonokopresipitasi, pelapisan SiO2 dan TiO2 dengan sol-gel, kemudian sensitisasi polianilin dengan polimerisasi oksidatif. Hasil sintesis dikarakterisasi dengan metode spektrofotometri inframerah, X-Ray Diffraction (X-RD), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX) dan Specular Reflectance Ultra Violet-Visible (SR UV-Vis) Spectrophotometry. Aktivitas material Fe3O4/SiO2/TiO2 tersensitisasi polianilin dievaluasi melalui fotoreduksi ion Ag(I) pada paparan sinar tampak dan UV. Hasil penelitian menunjukkan bahwa sintesis komposit Fe3O4/SiO2/TiO2 tersensitisasi polianilin telah berhasil dilakukan. Keberadaan Fe3O4, SiO2, TiO2 dan polianilin terlihat dengan adanya pita serapan pada bilangan gelombang berturut-turut: 1396, 1096, 477-795 dan 1437 serta 1576 cm-1. Puncak difraksi pada 2theta: 29,94; 35,35; 45,14; 56,81 dan 62,80° menunjukkan keberadaan Fe3O4. Keberadaan anatase TiO2 dibuktikan dengan adanya puncak difraksi pada 2theta 25,14°. Energi celah pita komposit Fe3O4/SiO2/TiO2-PANI dengan rasio mol anilin/TiO2 0, 1, 3, 5 dan 7% secara berurutan adalah: 3,23; 3,09; 3,08; 2,94 dan 2,90 eV. Aktivitas fotokatalitik terbaik komposit Fe3O4/SiO2/TiO2-PANI diperoleh pada rasio mol anilin/TiO2 1%. Fotoreduksi 25 mL larutan Ag(I) 30 ppm terkatalisis 5 mg Fe3O4/SiO2/TiO2-PANI 1 pada pH 8 dan waktu reaksi 60 menit didapatkan persentase ion Ag(I) tereduksi sebanyak 35,08 dan 46,94% berturut-turut pada paparan sinar tampak dan UV.

Synthesis of polyaniline (PANI) sensitized Fe3O4/SiO2/TiO2 composites has been performed. This study aimed to synthesize and evaluate the activity of polyaniline sensitized Fe3O4/SiO2/TiO2 composites. The synthesis of polyaniline sensitized Fe3O4/SiO2/TiO2 composites was carried out in several stages; synthesis of Fe3O4 by sono-coprecipitation, coating of SiO2 as well as TiO2 by sol-gel method, then sensitization of polyaniline by oxidative polymerization method. The characterization was performed by infrared spectrophotometry, X-Ray Diffraction (X-RD), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX) and Specular Reflectance Ultra Violet-Visible (SR UV-Vis) Spectrophotometry. The activity of polyaniline sensitized Fe3O4/SiO2/TiO2 composites was evaluated on the photoreduction of Ag(I) ion in visible and UV light explosure. The results showed that the polyaniline sensitized Fe3O4/SiO2/TiO2 composites was synthesized successfully. The existence of Fe3O4, SiO2, TiO2 and polyaniline was seen in the presence of absorption bands in: 1396, 1096, 477-795 and 1437 and 1576 cm-1 wavenumbers. Diffraction peaks at 2theta: 29.94; 35.35; 43.14; 56.81 and 62.50° showed the existence of Fe3O4. The existance of TiO2 was proved with diffraction peak at 2theta 25.14°. The band gap energy of polyaniline sensitized Fe3O4/SiO2/TiO2 with aniline/TiO2 mol ratio of 0, 1, 3, 5 and 7% were: 3.23; 3.09; 3.08; 2.94 and 2.90 eV, respectively. The best photocatalytic activity of polyaniline sensitized Fe3O4/SiO2/TiO2 composites was obtained in the mole ratio of 1% aniline/TiO2. Photoreduction of 25 mL of Ag(I) 30 ppm solution catalyzed by 5 mg Fe3O4/SiO2/TiO2-PANI 1 at a pH of 8 and with the reaction time of 60 minutes gave the percentage of reduced Ag(I) ion were 35.08 and 46.94% under visible and ultraviolet irradiation, respectively.

Kata Kunci : anilin, fotokatalis, sensitisasi, titanium dioksida