Abstract
The synthesis of Bi3+ doped TiO2 was carried out using the sol-gel method with the precursor solution of titanium tetraisopropoxide (TTiP). Bi3+ cation dopant is done to reduce the energy of the TiO2 band gap so that it can be active in the visible light region. The synthesized Bi(III) –TiO2 photocatalyst was characterized using DRS UV-Vis, FTIR, and EDX. The results of the DRS UV-Vis analysis showed that 1% Bi(III) –TiO2 photocatalyst had a bandgap energy of 2.79 eV or equivalent to a wavelength of 469.97 nm. Infrared spectra show that there is a unique absorption at the wave number 956,56 cm-1 which is the absorption of the vibration Bi-O-Ti group. Photocatalyst Bi(III) -TiO2 was then tested for antibacterial activity against E. coli in polluted water. The activity test was carried out using the turbidimetric method by UV-vis spectrophotometry. The results of the activity test for 120 minutes with the help of visible light showed that the photocatalyst Bi(III) –TiO21% had the best antibacterial activity. The decrease in the number of E. coli in the water reached 48.54%.
Highlights
doped TiO2 was carried out using the solgel method with the precursor solution of titanium tetraisopropoxide
TiO2 was characterized by DRS UV-Vis
The results of the DRS UV-Vis analysis showed that 1% Bi(III
Summary
Titanium dioksida (TiO2) atau dikenal dengan titania merupakan suatu semikonduktor yang dapat digunakan sebagai fotokatalis [1]. Fotokatalis TiO2 banyak digunakan dalam proses pemurnian air, pengolahan limbah cair, ataupun untuk mendegradasi polutan organik dan bakteri. Proses degradasi bakteri dengan TiO2 tersebut masih memiliki kelemahan yaitu hanya aktif pada sinar UV, hal ini dapat disebabkan karena celah pita TiO2 terlalu lebar yaitu 3,03,2 eV. Kation Bi3+ memiliki jari-jari ionik sebesar 0,74Å yang dapat digunakan sebagai dopan dengan cara mensubstitusi sebagian Ti4+ dalam material TiO2. Penelitian sebelumnya yang telah dilakukan menggunakan dopan kation Bi3+ terbukti mampu meningkatkan efisiensi fotokatalis. Salah satu penelitian yang telah dilakukan yaitu menggunakan fotokatalis terdoping Bi3+ untuk mendegradasi Rhodamin-B (RB) dibawah radiasi sinar UV dan sinar tampak. Hasil penelitiannya menunjukkan TiO2 yang terdoping Bi mampu meningkatkan efisiensi hingga 95,6% dibanding dengan TiO2 murni yang hanya mampu mendegradasi RB sebesar 5% [9]. Bahan-bahan yang digunakan pada penelitian ini yaitu akuades, ammonium (NH3) (Merck), asetil aseton (C5H8O2) (Merck), asam asetat (CH3COOH) (Merck), asam nitrat (HNO3) (Merck), bakteri E.coli, bismut nitrat (Bi(NO3)3.5H2O) (Merck), ekstrak yeast, etanol (C2H5OH) 97% (Merck), natrium klorida (NaCl) (Merck), nutrient broth (Merck), nutrient agar (Merck), titanium isopropoksida (Ti(OC3H7)4) (Sigma Aldrich)
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