Sintesis TiO2 terdoping Fe3+ untuk Degradasi Rhodamin B Secara Fotokatalisis dengan Bantuan Sinar Tampak

Abstract

Fotokatalis TiO2 terdoping Fe3+ telah disintesis menggunakan titanium tetraisopropoksida (TTIP) sebagai prekursor serta dopan Fe3+ dari Fe(NO3)3 dengan metode sol-gel. Fotokatalis TiO2 didoping menggunakan Fe3+ bertujuan untuk memperlebar serapan dari sinar Ultra Violet (UV) hingga sinar tampak pada berbagai variasi persentase Fe3+ 0,05%; 0,125%; 0,25% (b/v). karakterisasi fotokatalis dilakukan dengan metode spektrofotometri UV-Vis/DRS, FT-IR, XRD dan diuji aktivitasnya terhadap degradasi rhodamin B. Hasil pengukuran UV-Vis/DRS dari setiap variasi memberikan energi celah pita (Eg) masing-masing sebesar 1,33 eV, 2,11 eV, 2,53 eV. Spektra Infra merah (FT-IR) menunjukkan serapan Fe-O yang merupakan interaksi antara TiO2 dengan dopan Fe3+ dalam struktur TiO2. Hasil pengukuran x-ray difraction (XRD) Fe-TiO2 memberikan difragtogram pada 2θ 25,4773°, 37,9223°, 48,0159° mengindikasikan bahwa Fe3+ telah tersubsitusi kedalam struktur TiO2. Dopan Fe3+ yang telah tersubsitusi juga dapat dibuktikan dari penurunan ukuran rata-rata kristalit dan jarak antar kisi. Hasil Uji Aktivitas konsentrasi dopan Fe3+ 0,125% memiliki aktivitas tertinggi yaitu sebesar 25,605%. Hasil penelitian tersebut menunjukkan bahwa Fe-TiO2 memiliki potensi dalam mendegradasi rhodamin B menggunakan sinar tampak.

Fe-doped TiO2/Kaolinite as an Antibacterial Photocatalyst under Visible Light Irradiation

“…After visible light irradiated for 120 min, the OD600 value of Fe-TiO2/kaolinite is much lower than TiO2/kaolinite and TiO2, where arise to 0.01 and 0.23, respectively. It may be an indication that the formation of photogenerated electronhole pairs on the surface of Fe-TiO2/kaolinite is easier to occur than TiO2 when absorbing visible light because it has a smaller band gap as a result of the mixing of the Fe 2p with Ti 2p orbitals [16][17][18]. These results are consistent with the absorption spectra.…”

“…The TiO2 and Fe-doped TiO2 nanoparticle was prepared by sol-gel method using titanium isopropoxide (TTIP) as titanium precursor. Preparation of Fe-doped-TiO₂ sol was carried out according to our previous report [17]. Briefly, 7.5 mL of TTIP and 26.5 mL of ethanol were mixed simultaneously into 2 mL acetic acid and 2 mL distilled water and put in a reflux flask then added 1 mL acetylacetone.…”

“…Afterwards, the solid content was calcined at 450 °C for 3 h to form Fedoped TiO2/kaolinite composite. Fe 3+ cations doping, the TiO2 crystal growth and anchored into the kaolinite surface have occurred simultaneously during calcination treatment [10,11,17]. The same procedure was carried out for TiO2/kaolinite composite as a control.…”

“…Surface properties of the composites are changing during the calcination process, which could lead to increase of ROS production. The kaolinite is exposed to the temperatures higher than approximate 470 °C and it starts to lose its interlayer water and dehydroxylation of the kaolinite structure occurs [17]. There was improved the surface area of the photocatalyst caused enhance its capacity absorption.…”

Synthesis and Characterization of SCDs/TiO2 Composite

“…Absorption at wave numbers 696-718 cm -1 was a stretching vibration of Ti-O [29,30]. TiO 2 and SCDs/TiO 2 composites were observed for absorption peaks at wave number 412 cm -1 as a characteristic of Ti-O stretching vibration [24] [6]. The results showed that the combination of SCDs with TiO 2 does not cause a shift in the titanium oxide absorption peak.…”