A comparative study for removal of different dyes over M/TiO 2 (M = Cu, Ni, Co, Fe, Mn and Cr) photocatalysts under visible light irradiation

Kuyumcu, Özge Kerkez; Kibar, Efgan; Dayıoğlu, Kübra; Gedik, Fadime; Akın, Ayşe Nilgün; Özkara-Aydınoğlu, Şeyma

doi:10.1016/j.jphotochem.2015.05.037

Cited by 129 publications

(34 citation statements)

References 41 publications

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“…Among various transition metals (i.e., Pt, Ag, Au, Ru, and Pd) [28][29][30][31] and transition metal oxides (i.e., Cu 2 O, α-Fe 2 O 3 ) [32][33][34], cobalt [35,36] and cobalt oxides [37][38][39][40] as an interesting low-cost and earth-abundant mineral have attracted tremendous attention for the development of visible light active TiO 2 materials. Cobalt-doped TiO 2 photocatalysts have been synthesized by various methods, such as the sol/gel technique [36,[41][42][43][44][45][46][47][48][49][50], hydrothermal treatment [51][52][53][54], impregnation method [55,56], precipitation process [57] for the photocatalytic degradation of methylene blue [57,58], rhodamine B [58], methylene orange [57], phenol [41], 2-chlorophenol [41], and so on.…”

Section: Introductionmentioning

confidence: 99%

UV/Vis Light Induced Degradation of Oxytetracycline Hydrochloride Mediated by Co-TiO2 Nanoparticles

et al. 2020

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Pharmaceuticals, especially antibiotics, constitute an important group of aquatic contaminants given their environmental impact. Specifically, tetracycline antibiotics (TCs) are produced in great amounts for the treatment of bacterial infections in both human and veterinary medicine. Several studies have shown that, among all antibiotics, oxytetracycline hydrochloride (OTC HCl) is one of the most frequently detected TCs in soil and surface water. The results of the photocatalytic degradation of OTC HCL in aqueous suspensions (30 mg·L−1) of 0.5 wt.% cobalt-doped TiO2 catalysts are reported in this study. The heterogeneous Co-TiO2 photocatalysts were synthesized by two different solvothermal methods. Evonik Degussa Aevoxide P25 and self-prepared TiO2 modified by the same methods were used for comparison. The synthesized photocatalysts were characterized by X-ray powder diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), UV/vis diffuse reflectance spectroscopy (DRS), and N2 adsorption (BET) for specific surface area determination. The XRD and Raman results suggest that Ti4+ was substituted by Co2+ in the TiO2 crystal structure. Uv/visible spectroscopy of Co-TiO2-R showed a substantial redshift in comparison with bare TiO2-R. The photocatalytic performance of the prepared photocatalysts in OTC HCL degradation was investigated employing Uv/vis spectroscopy and high-performance liquid chromatography (HPLC). The observed initial reaction rate over Co-TiO2-R was higher compared with that of Co-TiO2-HT, self-prepared TiO2, and the commercial P25. The enhanced photocatalytic activity was attributed to the high surface area (153 m2·g−1) along with the impurity levels within the band gap (2.93 eV), promoting the charge separation and improving the charge transfer ability. From these experimental results, it can be concluded that Co-doping under reflux demonstrates better photocatalytic performances than with the hydrothermal treatment.

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Section: Introductionmentioning

confidence: 99%

UV/Vis Light Induced Degradation of Oxytetracycline Hydrochloride Mediated by Co-TiO2 Nanoparticles

et al. 2020

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“…Thus, the transfer and separation of the charge carriers is possible by optimising the Fe 3+ dopant concentration, which is believed to increase the photogenerated charge carriers lifetime. It is also known that Fe 3+ doping influences the bandgap of the catalyst, enabling a possible extension of the activity of titania towards the visible region [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Study of the photocatalytic activity of Fe3+, Cr3+, La3+ and Eu3+ single-doped and co-doped TiO2 catalysts produced by aqueous sol-gel processing

Malengreaux

Pirard

Léonard

et al. 2017

Journal of Alloys and Compounds

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An aqueous sol-gel process, previously developed for producing undoped and Cu 2+ , Ni 2+ , Zn 2+ or Pb 2+ doped TiO 2 photocatalystswith remarkably high photocatalytic activity without requiring any calcination step, has been adapted to produce Fe 3+ , Cr 3+ , La 3+ or Eu 3+ singledoped TiO 2 photocatalysts as well as La 3+-Fe 3+ and Eu 3+-Fe 3+ co-doped TiO 2 catalysts. The physicochemical properties of the obtained catalysts have been characterized using a suite of complementary techniques, including ICP-AES, XRD, UV-Vis spectroscopy, nitrogen adsorption-desorption and Fe-57 Mössbauer. The active crystalline phase is obtained without requiring any calcination step and all the different catalysts are composed of nanocrystallites of anatase with a size of 6-7 nm and a high specific surface area varying from 181 to 298 m² g-1. In this study, the effect of the NO 3 :Ti(IV) mole ratio used to induce the peptisation reaction during the synthesis has been studied and the results revealed that this ratio can influence significantly the textural properties of the resulting catalyst. A screening of the photocatalytic activity of the undoped and Fe 3+ , Cr 3+ , La 3+ or Eu 3+ singledoped and co-doped photocatalysts has been performed by evaluating the degradation of 4nitrophenol under UV-Visible light (330 nm <λ< 800 nm). This study suggests that the photocatalytic activity is significantly influenced by the dopant nature and content with an optimal dopant content being observed in the case of Fe 3+ or La 3+ single-doped as well as in the case of La 3+-Fe 3+ and Eu 3+-Fe 3+ co-doped catalysts. In the case of Cr 3+ single-doped catalysts, a detrimental effect of the dopant on the photocatalytic degradation of 4-nitrophenol has been observed while no significant influence of the dopant has been detected in the case

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“…Moreover, morphology, particle size and surface area of these aggregates might be correlated to the low amount of gases released during the combustion [31] [49,50]. Similar observation was also shown for carbon, iron, zinc or platinum doped -TiO 2 compounds, inducing a shift in the absorption spectra to the red [51,52]. The band gap energy for TiO 2 samples was estimated from the Tauc relationship αhv = A(hv − E g ) n [53] where α is the absorption coefficient which is proportional to the function of the reflectance (F(R)) according with the Kubelka -Munk model, hv is the photon energy, A is a proportional constant, E g is the band gap energy and n is a factor dependent of the transition nature which is 2 for TiO 2 in the anatase phase [54].…”

Section: Structural Characterizationmentioning

confidence: 62%

“…8 shows that Fe-doped TiO 2 presented the lowest production of ROS, even lower than commercial anatase, regardless its higher capacity of light absorption in the visible region when compared to other compounds. Similarly, Özge Kerkez-Kuyumcu et al [51] attributed the lower activity of Fe by their inability to act as intermediate energy levels to hold electrons leaping from valence band of TiO 2 . The interaction of titania loaded and Fe metal ions might have created a number of surface defects, which increased the probability of recombination of the light induced charges.…”

Section: Structural Characterizationmentioning

confidence: 98%

Solution-combustion synthesis of doped TiO 2 compounds and its potential antileishmanial activity mediated by photodynamic therapy

Lopera

Velásquez

Clementino

et al. 2018

Journal of Photochemistry and Photobiology B: Biology

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Photodynamic therapy has emerged as an alternative treatment for cutaneous leishmaniasis, and compounds with photocatalytic behavior are promising candidates to develop new therapeutic strategies for the treatment of this parasitic disease. Titanium dioxide TiO is a semiconductor ceramic material that shows excellent photocatalytic and antimicrobial activity under Ultraviolet irradiation. Due to the harmful effects of UV radiation, many efforts have been made in order to enhance both photocatalytic and antimicrobial properties of TiO in the visible region of the spectrum by doping or through modifications in the route of synthesis. Herein, Fe-, Zn-, or Pt- doped TiO nanostructures were synthesized by solution-combustion route. The obtained compounds presented aggregates of 100 nm, formed by particles smaller than 20 nm. Doping compounds shift the absorption spectrum towards the visible region, allowing production of reactive oxygen species in the presence of oxygen and molecular water when the system is irradiated in the visible spectrum. The Pt (EC = 18.2 ± 0.8 μg/mL) and Zn (EC = 16.4 ± 0.3 μg/mL) -doped TiO presented the higher antileishmanial activities under visible irradiation and their application as photosensitizers in photodynamic therapy (PDT) strategies for the treatment of cutaneous leishmaniasis should be considered.

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A comparative study for removal of different dyes over M/TiO 2 (M = Cu, Ni, Co, Fe, Mn and Cr) photocatalysts under visible light irradiation

Cited by 129 publications

References 41 publications

UV/Vis Light Induced Degradation of Oxytetracycline Hydrochloride Mediated by Co-TiO2 Nanoparticles

UV/Vis Light Induced Degradation of Oxytetracycline Hydrochloride Mediated by Co-TiO2 Nanoparticles

Study of the photocatalytic activity of Fe3+, Cr3+, La3+ and Eu3+ single-doped and co-doped TiO2 catalysts produced by aqueous sol-gel processing

Solution-combustion synthesis of doped TiO 2 compounds and its potential antileishmanial activity mediated by photodynamic therapy

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