Removal of the hormones dexamethasone (DXM) by Ag doped on TiO2 photocatalysis

Pei

et al. 2018

Sci Rep

The pure, tin (Sn)-doped, lanthanum (La)-doped and Sn/La co-doped titanium dioxide (TiO2) nanomaterials were synthesized using sol-gel method followed by calcination at the temperature of 360 °C, 450 °C and 600 °C, respectively. The structures of the nanomaterials were characterized by X-ray diffraction (XRD), Thermogravimetric (TG), Differential Thermal Analysis (DTA), Scanning Electron Microscopy (SEM), Energy Dispersive Spectrum (EDS), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectrum (XPS), Diffuse Reflectance Spectrum (DRS), Photoluminescence Spectrum (PL), Brunauer-Emmett-Teller Measurements (BET), respectively. The photocatalytic property of the photocatalysts under UV light was evaluated through the degradation of Rhodamine B (RhB). The results show that the anatase-rutile phase transition is promoted by Sn-doping while La-doping retards the phase transition. However, La doping plays a major role in the process of phase transformation. The photocatalytic activity of pure TiO2 is affected by annealing temperature remarkably and the optimal annealing temperature is 450 °C. The photocatalytic activity of TiO2 is enhanced significantly by Sn and La doping at three different temperatures. Sn/La-TiO2 exhibits the highest degradation rates and the fastest reaction rates probably owing to the synergistic effect of Sn4+ and La3+ ions in inhibiting the recombination of photogenerated electron-hole pairs. The formation of extra surface hydroxyl groups and additional surface area are also beneficial for the photocatalytic activity.

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Preparation and characterization of Sn/La co-doped TiO2 nanomaterials and their phase transformation and photocatalytic activity

Pei

et al. 2018

Sci Rep

Journal of Nanotechnology

“…us, many approaches have been devoted to improve the light response of TiO 2 in the visible light region. For instance, nonmetal doping (B, C, N, S, and F), metal doping (Fe, Co, and La), and codoping (Fe and N, B and C) [14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Fe-TiO₂ Nanoparticles Synthesized by Green Chemistry for Potential Application in Waste Water Photocatalytic Treatment

Solano

Herrera

Maestre

et al. 2019

Anatase TiO2 nanoparticles doped with iron ions have been synthesized via the green chemistry method using aqueous extract of lemongrass (Cymbopogon citratus) obtained from Soxhlet extraction and doped by wet impregnation. The TiO2 anatase phase has been doped with Fe3+ (0.05, 0.075, and 0.1 Fe3+ : Ti molar ratio) at 550°C and 350°C, respectively. The scanning electron microscopy with energy-dispersive X-ray (SEM-EDS) shows nanoparticle clusters and efficiencies of impregnations between 66.5 and 58.4% depending on the theoretical dopant amount. The electron transmission microscopy (TEM) reveals final particle sizes ranging between 7 and 26 nm depending on the presence or not of the dopant. The cathodoluminescence (CL) and photoluminescence (PL) studies of the doped and undoped nanoparticles show a luminescence signal attributed to surface oxygen vacancies (visible CL emission 380–700 nm and PL emission 350–800 nm); additionally, a decrease in emission intensity is observed due the inhibition of the recombination of the photogenerated electron-holes pairs; moreover, nanopowders were analyzed by UV-Vis spectrophotometry of diffuse reflectance, and the absorption edge of the Fe-TiO2 in comparison to undoped TiO2 is extended greatly toward the visible light. The six bands (A1g + 2B1g + 3Eg) found by Raman spectroscopy and the x-ray diffraction pattern (XRD) confirm that synthesized TiO2 is only anatase phase, which is commonly used as a catalyst in waste water treatment, specifically in heterogeneous photocatalytic processes.

“…The textile industry effluents are among the major environmental pollution sources, especially water pollution, which destroys the aquatic life and seriously influences the planet climate changes [1]. However, various physical and chemical techniques have been investigated to remove dye compounds such as adsorption on activated carbon, biodegradation, ozonation, and advanced oxidation processes (AOPs) such as Fenton and photo-Fenton reactions [2,3], H 2 O 2 /UV processes and TiO 2 photocatalysis [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Synergistic effects of C, N, S, Fe-multidoped TiO2 for photocatalytic degradation of methyl orange dye under UV and visible light irradiations

et al. 2019

The aim of this work is the synthesis and characterization of C, N, S-Fe multidoped TiO 2 photocatalysts. The nanoparticles were prepared by sol-gel method and investigated by X-ray diffraction (XRD), transmission electron microscopy, UV-visible diffuse reflectance spectroscopy (DRS) and N 2 adsorption-desorption isotherm (BET). Photocatalytic activity of the photocatalysts was studied by degrading methyl orange (MO) under UV and visible light irradiations. XRD analysis illustrated that all synthesized samples present the anatase phase. CNS-0.3Fe-doped TiO 2 exhibited the highest surface area of 891 m 2 /g. DRS showed that Fe doping had efficiently narrowed the band gap to 2.74 eV and broaden the visiblelight response region. The synthesized nanomaterials exhibited high photodegradation ability in the decomposition of MO than commercial pure TiO 2 nanoparticles Degussa P25.