Surfactant assisted synthesis of cobalt doped titania nanomaterial: Characterization and its applications in photocatalysis and anti-bacterial activity

The synthesis of 0.5 wt. % cobalt doped titania nanomaterial (Co2+-TiO2) assisted by sodium dodecyl sulfate anionic surfactant by sol-gel method is reported. The synthesized catalysts are characterized by XRD, UV-vis DRS, FT-IR, BET, TEM, SEM and XPS analysis. XRD results show that all the catalysts are in anatase phase. UV-vis DRS studies indicate that decrease in band gap of TiO2 is due to doping of Co2+. FT-IR studies indicate the insertion of Co2+ into TiO2 lattice as a substitutional dopant. BET analysis shows an increase in surface area of the catalyst. From SEM and TEM analysis, change in the morphology of the particles with reduced particle size is observed. XPS studies confirm the presence of Co2+ along with Ti and O. The photocatalytic efficiency of the catalyst has been evaluated by degradation of methyl red under visible light irradiation at various reaction parameters. The antibacterial activity of the catalyst against Escherichia coli has also been investigated

Surfactant assisted synthesis of cobalt doped titania nanomaterial: Characterization and its applications in photocatalysis and anti-bacterial activity

278-286The synthesis of 0.5 wt. % cobalt doped titania nanomaterial (Co2+-TiO2) assisted by sodium dodecyl sulfate anionic surfactant by sol-gel method is reported. The synthesized catalysts are characterized by XRD, UV-vis DRS, FT-IR, BET, TEM, SEM and XPS analysis. XRD results show that all the catalysts are in anatase phase. UV-vis DRS studies indicate that decrease in band gap of TiO2 is due to doping of Co2+. FT-IR studies indicate the insertion of Co2+ into TiO2 lattice as a substitutional dopant. BET analysis shows an increase in surface area of the catalyst. From SEM and TEM analysis, change in the morphology of the particles with reduced particle size is observed. XPS studies confirm the presence of Co2+ along with Ti and O. The photocatalytic efficiency of the catalyst has been evaluated by degradation of methyl red under visible light irradiation at various reaction parameters. The antibacterial activity of the catalyst against Escherichia coli has also been investigated

Synthesis of cobalt doped titania nano material assisted by gemini surfactant: Characterization and application in degradation of Acid Red under visible light irradiation

The present work focuses on the synthesis of cobalt doped titania nano material assisted by 1,4-butane sultone anionic gemini surfactant: Co2+-TiO2 (with surfactant). The synthesized nano catalysts were characterized by XRD, UVâVis DRS, XPS, SEM, FT-IR, HR-TEM and BET-surface area analysis. XRD and UV-DRS studies have indicated that all the catalysts synthesized were in anatase phase and red shift was observed with decrease in the band gap energy. XPS analysis of the catalysts has confirmed the presence of cobalt along with TiO2. SEM analysis indicated change in morphology of the particles without any agglomeration. From FTIR studies frequency shift was observed for TiO2 which was due to doping of cobalt into TiO2 lattice. TEM images have shown reduced particle size of Co2+-TiO2 (with surfactant). BET analysis confirmed increase in surface area of the catalyst. From BET analysis Pore volume and pore size was also analyzed. These results emphasize the important role played by the gemini surfactant on the structure and photocatalytic activity of the catalyst synthesized. The photocatalytic efficiency of the synthesized catalyst was investigated by degradation of Acid Red where degradation was completed within 30 min. Keywords: Cobalt doped titania nanomaterial, Gemini surfactant, Solâgel method, Photocatalysis, Acid Re

Synthesis, characterization and photocatalytic activity of alkaline earth metal doped titania

1189-1196The synthesis of beryllium doped titania (Be2+–TiO2) at different percentages (0.25, 0.5, 0.75 and 1.0 wt %) by sol-gel method and its characterization by XRD, UV-visible absorption spectroscopy, XPS, SEM and FT-IR techniques are reported. Diffraction peaks of anatase crystalline phase have been observed both in synthesized TiO2 as well as in Be2+–TiO2. Presence of Be2+ ions in the TiO2 structure causes significant absorption shift towards the visible region. FT-IR and XPS data show the interstitial presence of Be2+ ion in TiO2. The photocatalytic efficiency of the synthesized Be2+–TiO2 and unsubstituted TiO2 has been evaluated by the degradation of monocrotophos pesticide under visible light irradiation, wherein the degradation rate of MCP by Be2+–TiO2 is found to be higher than by unsubstituted TiO2. This may be attributed to the more efficient electron-hole creation in Be2+–TiO2 in visible light, as compared to unsubstituted TiO2 which can be excited only by UV irradiation. The effect of dopant concentration, pH, catalyst dosage and pollutant concentration have been studied for obtaining optimal degradation conditions

Synthesis, characterization and visible light photocatalytic activity of Mg2+ and Zr4+ co-doped TiO2 nanomaterial for degradation of methylene blue

Mg2+ and Zr4+ co-doped TiO2 was synthesized by sol–gel method. Catalysts were characterized by XRD, UV–vis DRS, SEM-EDX, TEM, BET, XPS and FT-IR to evaluate the crystal patterns and crystallite size (5.07–18.9 nm), bandgap energy, morphology, surface area, surface composition with oxidation states and incorporation of dopants into TiO2 lattice. Degradation of methylene blue was carried out under visible light irradiation by varying the reaction parameters such as initial dye concentration, catalyst loading and pH of the solution. 1.0 wt% Mg2+ and 0.25 wt% Zr4+ codoped TiO2 was found to be an efficient catalyst