Synthesis and Bactericidal Ability of TiO₂and Ag-TiO₂Prepared by Coprecipitation Method

Abstract

Preparation of photocatalysts of TiO 2 and Ag-TiO 2 was carried out by coprecipitation method. The prepared photocatalysts were characterized by X-ray diffraction (XRD), SEM, EDX, and XRF analysis. The disinfection of E. coli, a model indicator organism for the safe water supply, was investigated by using TiO 2 and Ag-TiO 2 under different light sources. The treatment efficacy for the inactivation of E. coli would be UV/Ag-TiO 2 ; visible/Ag-TiO 2 ; dark/Ag-TiO 2 ; UV (all 100%) > UV/TiO 2 (99%) > visible/TiO 2 (96%) > dark/TiO 2 (87%) > visible (23%) > dark (19%). The order of disinfection efficiency by their corresponding kinetic initial apparent rate constants, k app , (min −1 ) would be UV/Ag-TiO 2 ; visible/Ag-TiO 2 (both 6.67) > UV (6.6) > dark/Ag-TiO 2 (6.56) > UV/TiO 2 (1.62) > visible/TiO 2 (1.08) > dark/TiO 2 (0.7) > visible (0.28) > dark (0.03). The application of TiO 2 doped with silver strongly improved the ability of disinfection treatment. The study of mineralization of E. coli by measurement of TOC (total organic carbon) removal percentage showed that the visible light may effectively be applied for the disinfection unit of water and wastewater treatment system by using photocatalysts of Ag-TiO 2 .

Inorganic engineered nanoparticles in drinking water treatment: a critical review

“…6 Water purification systems using supported Ag nanoparticles into biopolymer-reinforced synthetic granular nanocomposites (a,b), 279 bactericidal paper impregnated with Ag nanoparticles (c), 293 woven fabric microfiltration gravity filter (d), 287 and Ag nanoparticles-doped paper (e). 318 Similar conclusions were deduced by investigating the bactericidal ability of TiO 2 and Ag-TiO 2 prepared by co-precipitation method 319 . 305 He et al reported the combination of Au nanoparticles with ZnO ones to form hybrid nanostructures with enhanced photocatalytic and antimicrobial activity.…”

Synthesis of C-N-S-Tridoped TiO2 from Vietnam Ilmenite Ore and Its Visible Light-Driven-Photocatalytic Activity for Tetracyline Degradation

“…It is well-known that free radicals such as photo-induced electrons and holes, • OH and O 2 (•-) , play a critical role in the degradation reactions of organic compounds. In particular, tert-butylic alcohol (TB) is used as a quencher for • OH [37], 1,4-benzoquinon-(BQ-) quencher for O 2 (•-) [38,39], ammonium oxalate-(AO-) quencher for H + [37,39], and silver nitrate-(BN-) quencher for photosynthetic electrons e - [40]. The 2 mL of 10 mM quenching solutions was added just after 30 min of dark adsorption.…”

Role of Platinum Deposited on TiO2in Photocatalytic Methanol Oxidation and Dehydrogenation Reactions

“…These properties make TiO 2 an attractive candidate for its utilization as a photocatalyst in the photocatalytic processes. TiO 2 has been extensively studied and demonstrated to be suitable for numerous applications such as, destruction of microorganisms [2][3][4][5], inactivation of cancer cells [6,7], protection of the skin from the sun [8][9][10][11], photocatalytic water splitting to produce hydrogen gas [12][13][14], manufacture of some drug types [15][16][17], degradation of toxic organic pollutants in water [18][19][20], and self-cleaning of glass and ceramic surfaces [21]. Even though TiO 2 is the most used semiconductor material, it exhibits some disadvantages, such as low surface area and fast recombination rate between the photogenerated charge carriers and the maximum absorption in the ultraviolet light region.…”