Improved degradation of etodolac in the presence of core-shell ZnFe2O4/SiO2/TiO2 magnetic photocatalyst

Mrotek, Eryka; Dudziak, Szymon; Malinowska, Izabela; Pelczarski, Daniel; Ryżyńska, Zuzanna; Zielińska‐Jurek, Anna

doi:10.1016/j.scitotenv.2020.138167

Cited by 45 publications

(25 citation statements)

References 48 publications

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“…The degradation efficiency of methylene blue (MB) was obtained 57% and 87% after 90 min under UV irradiation for TiO2 and TiO2:SiO2 composite [10], respectively. Moreover, the enhancing surface areas when combine SiO2 and TiO2 was also observed in many research [11][12][13][14]. It has been proved that the important role of SiO2 in improvement specific surface of photocatalyst.…”

Section: Introductionmentioning

confidence: 64%

Enhanced photocatalytic degradation performance of bisphenol A over TiO2-SiO2 photocatalyst by improving specific surface area under simulation natural light

Le¹,

Huu²,

Kieu³

et al. 2020

Vietnam j. catal. adsorp.

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The application of natural light in photocatalytic process is a potential energy source. In this study, TiO2-SiO2 nanoparticles with outstandingly enhanced photocatalytic activity have been fabricated by sol-gel method. The prepared photocatalysts with different molar ratio of TiO2:SiO2 as 100:0; 95:5; 85:15 and 75:25 were denoted as TiO2, TS5, TS15 and TS25, respectively. Characterization of these photocatalysts was evaluated using transmission electron microscopy (TEM), X-ray diffraction (XRD), N2 Adsorption and Desorption isotherms method (Brunauer–Emmet–Teller, BET). The specific surface area was improved in TiO2-SiO2 photocatalyst namely 193.9 m2.g-1 (at molar ratio of TiO2:SiO2 of 95:5) compared to 33.6 m2.g-1 of TiO2. The crystallite size was calculated around 5 nm from XRD data and uniform particle size distribution was observed in TEM image. The photocatalytic experiments were performed with bisphenol A (BPA) as model compound of organic pollutant. The effect of various operation parameters such as initial concentration, initial solution pH and photocatalyst dosage has been investigated. The kinetic studies of the photocatalytic degradation BPA over TS5 followed the pseudo-first order (k=1.09×10-2 min-1) and degradation yield to be 82.4% BPA, at pH6.23, initial concentration to be 10 ppm and photocatalyst dosage to be 1.0 g.L-1. The photocatalyst TS5 maintained activity after four cycles and remained 78%. The TiO2-SiO2 composite photocatalyst has shown to be a promising heterogeneous photocatalyst for organic degradation.

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Section: Introductionmentioning

confidence: 64%

Enhanced photocatalytic degradation performance of bisphenol A over TiO2-SiO2 photocatalyst by improving specific surface area under simulation natural light

Le¹,

Huu²,

Kieu³

et al. 2020

Vietnam j. catal. adsorp.

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“…A similar increase in surface area was already observed for LFO-based composites compared to both single phase materials, for instance in the case of heterojunctions obtained by synthesizing CdS nanorods [36] and g-C3N4 [31] in the presence of crystallized LFO. Also, Mrotek et al prepared a coreshell structured sol-gel TiO2-based composite with an enhanced surface area in comparison to that of ZnFe2O4/SiO2 used as core material [54]. Composite catalysts give rise, in all cases, to decay data fitting monoexponential curves with lifetimes between ca.…”

Section: Lafeo3/tio2 Composite Catalyst Characterizationmentioning

confidence: 99%

“…Through the hydrolysis of butoxide, Li et al synthesized nanocrystalline and nanoporous sol-gel TiO2 shells surrounding microcrystalline (Ba,Sr)TiO3 cores, while Mrotek et al prepared ZnFe2O4/SiO2/TiO2 photocatalyst [54,71]. Using titanium isopropoxide, Fe2O3@TiO2 core-shell nanostructures were obtained [72], and Abdel-Wahed et al recently elaborated a MnFe2O4@rGO@TiO2 photocatalyst with core double-shell structure by performing the sol-gel synthesis in the presence of a pre-structured core-shell MnFe2O4@rGO host [73].…”

Section: Lafeo3/tio2 Composite Catalyst Characterizationmentioning

confidence: 99%

Activity enhancement pathways in LaFeO3@TiO2 heterojunction photocatalysts for visible and solar light driven degradation of myclobutanil pesticide in water

García‐Muñoz

Fresno

Ivanez

et al. 2020

Journal of Hazardous Materials

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TiO2@LaFeO3 heterojunction composites with a core-shell porous structure and LaFeO3 contents in the 2.5-25 wt.% range have been synthesized via consecutive sol-gel syntheses and tested for the photocatalytic oxidation of the myclobutanil pesticide in water under solar light and pure visible light.Whatever the light spectrum, the kinetic rate constants for both myclobutanil degradation and TOC conversion exhibited a volcano-like profile with increasing the narrow band-gap (2.1 eV) LaFeO3 content, the optimum composite strongly overperforming both single phases, with full myclobutanil mineralization achieved in 240 min in the best case. The light spectrum influenced the optimum LaFeO3 content in the composite, being observed at 5 wt.% and 12.5 wt.% under solar and visible light, respectively. This has been attributed to the existence of different light-mediated reaction mechanisms. The optimum LaFeO3/TiO2 composite photocatalyst was active and stable after several runs under solar light with leached iron concentration below 0.1 mg/L in solution.

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“…Changes in the BET surface area correlate well with differences noted on the XRD patterns for TBT-HIO 3 _T samples, presented in Figure 16. The higher the calcination temperature, the more intense the XRD diffraction peaks, which resulted from the increase in photocatalysts crystallinity [66]. Other changes concern crystallites growth (for anatase: from 5 to 12 nm TBT-HIO 3 _20_300 and TBT-HIO 3 _20_450, respectively and for rutile: from 17 to 53.5 nm for TBT-HIO 3 _20_400 and TBT-HIO 3 _20_1000, respectively) as well as the anatase to rutile phase transition.…”

Section: The Effect Of Thermal Treatment On Defective Tio2-hio3 Physimentioning

confidence: 99%

Preparation and Characterization of Defective TiO2. The Effect of the Reaction Environment on Titanium Vacancies Formation

et al. 2020

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Among various methods of improving visible light activity of titanium(IV) oxide, the formation of defects and vacancies (both oxygen and titanium) in the crystal structure of TiO2 is an easy and relatively cheap alternative to improve the photocatalytic activity. In the presented work, visible light active defective TiO2 was obtained by the hydrothermal reaction in the presence of three different oxidizing agents: HIO3, H2O2, and HNO3. Further study on the effect of used oxidant and calcination temperature on the physicochemical and photocatalytic properties of defective TiO2 was performed. Obtained nanostructures were characterized by X-ray diffractometry (XRD), specific surface area (BET) measurements, UV-Vis diffuse reflectance spectroscopy (DR-UV/Vis), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) spectroscopy. Degradation of phenol as a model pollutant was measured in the range of UV-Vis and Vis irradiation, demonstrating a significant increase of photocatalytic activity of defective TiO2 samples above 420 nm, comparing to non-defected TiO2. Correlation of EPR, UV-Vis, PL, and photodegradation results revealed that the optimum concentration of HIO3 to achieve high photocatalytic activity was in the range of 20–50 mol%. Above that dosage, titanium vacancies amount is too high, and the obtained materials’ photoactivity was significantly decreased. Studies on the photocatalytic mechanism using defective TiO2 have also shown that •O2− radical is mainly responsible for pollutant degradation.

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Improved degradation of etodolac in the presence of core-shell ZnFe2O4/SiO2/TiO2 magnetic photocatalyst

Cited by 45 publications

References 48 publications

Enhanced photocatalytic degradation performance of bisphenol A over TiO<sub>2</sub>-SiO<sub>2</sub> photocatalyst by improving specific surface area under simulation natural light

Enhanced photocatalytic degradation performance of bisphenol A over TiO<sub>2</sub>-SiO<sub>2</sub> photocatalyst by improving specific surface area under simulation natural light

Activity enhancement pathways in LaFeO3@TiO2 heterojunction photocatalysts for visible and solar light driven degradation of myclobutanil pesticide in water

Preparation and Characterization of Defective TiO2. The Effect of the Reaction Environment on Titanium Vacancies Formation

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