The effect of Fe segregation on the photocatalytic growth of Ag nanoparticles on rutile TiO2(001)

Busiakiewicz, A.; Kisielewska, Aneta; Piwoński, Ireneusz; Batory, D.

doi:10.1016/j.apsusc.2017.01.008

Cited by 19 publications

(6 citation statements)

References 25 publications

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“…So, tends to return to Fe 3+ . This leads to the generation of OH• radical and O 2 anion [27,34,41]. Although the Ag Fermi energy level is lower than the conduction band of TiO 2 , the oscillation hot electron around Ag is excited to higher energy level.…”

Section: Mechanism Of 4-cp Photocatalytic Degradationmentioning

confidence: 99%

Synthesis and evaluations of Fe3O4–TiO2–Ag nanocomposites for photocatalytic degradation of 4-chlorophenol (4-CP): effect of Ag and Fe compositions

et al. 2018

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This work reports the synthesis of nanocomposites of Fe 3 O 4-TiO 2-Ag with different weight concentrations of iron (Fe) and silver (Ag) doped on TiO 2. The nanocomposites were prepared by a novel and facile ultrasonic-assisted hydrothermal method, and their effectiveness was evaluated for photocatalytic degradation. X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and N 2 adsorption-desorption methods were performed to characterize the prepared catalysts. The photocatalytic activity of Fe 3 O 4-TiO 2-Ag was studied by illumination of 4-chlorophenol (4-CP) in an aqueous solution under UV irradiation, which showed significant enhancement in the degradation of 4-CP compared to un-doped nano TiO 2. The maximum degradation of 97% in 165 min for Fe 3+ and Ag + with 0.3 and 2% wt. was observed. Furthermore, the stability and reusability of the synthesized catalysts were studied and demonstrated only 3% decrease in removal efficiency after five cycles.

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Section: Mechanism Of 4-cp Photocatalytic Degradationmentioning

confidence: 99%

Synthesis and evaluations of Fe3O4–TiO2–Ag nanocomposites for photocatalytic degradation of 4-chlorophenol (4-CP): effect of Ag and Fe compositions

et al. 2018

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“…TiO 2 is a well-known photocatalyst widely applied for environmental purification due to its advantages, such as its highly active photocatalytic properties, chemical inertness, environmental-friendliness, non-toxicity, and cost-effectiveness [17][18][19][20][21][22][23][24]. It shows great potential in solving the difficult problem of reducing Cr(VI) to Cr(III) in industrial wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Reduction of Cr(VI) by Combined Magnetic TiO2-Based NFs and Ammonium Oxalate Hole Scavengers

Chang

2019

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Heavy metal pollution of wastewater with coexisting organic contaminants has become a serious threat to human survival and development. In particular, hexavalent chromium, which is released into industrial wastewater, is both toxic and carcinogenic. TiO2 photocatalysts have attracted much attention due to their potential photodegradation and photoreduction abilities. Though TiO2 demonstrates high photocatalytic performance, it is a difficult material to recycle after the photocatalytic reaction. Considering the secondary pollution caused by the photocatalysts, in this study we prepared Ag/Fe3O4/TiO2 nanofibers (NFs) that could be magnetically separated using hydrothermal synthesis, which was considered a benign and effective resolution. For the photocatalytic test, the removal of Cr(VI) was carried out by Ag/Fe3O4/TiO2 nanofibers combined with ammonium oxalate (AO). AO acted as a hole scavenger to enhance the electron-hole separation ability, thereby dramatically enhancing the photoreduction efficiency of Cr(VI). The reaction rate constant for Ag/Fe3O4/TiO2 NFs in the binary system reached 0.260 min−1, 6.95 times of that of Ag/Fe3O4/TiO2 NFs in a single system (0.038 min−1). The optimized Ag/Fe3O4/TiO2 NFs exhibited high efficiency and maintained their photoreduction efficiency at 90% with a recyclability of 87% after five cycles. Hence, taking into account the high magnetic separation behavior, Ag/Fe3O4/TiO2 NFs with a high recycling capability are a potential photocatalyst for wastewater treatment.

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“…and O 2 À protonation radicals ($OOH), and so on. 4,29 For example, when the TiO 2 is used as photocatalyst under ultraviolet (UV) light irradiation, the formations of ROS can be described as follow: [30][31][32][33][34] TiO 2 + hv / e À + h + (7) This suggests that the photogenerated e À and h + can be converted into the different ROS. In fact, the nonselective autooxidations of ROS involve in many parallel oxidation pathways during photocatalytic oxidations, 35 the photocatalytic selectivity of desired products is usually very low when the produces or substrates are seriously oxidized by these ROS in the water phase.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is well known that the photogenerated electrons (e − ) and holes (h + ) could react with dissolved oxygen [(O 2 ) aq ] or hydroxyl (–OH) on the surface of photocatalysts to produce various reactive oxygen species (ROS) during the reactions, such as hydroxyl radicals (·OH), superoxide anion radicals (·O 2 − ), and O 2 − protonation radicals (·OOH), and so on. 4,29 For example, when the TiO 2 is used as photocatalyst under ultraviolet (UV) light irradiation, the formations of ROS can be described as follow: 30–34 TiO 2 + hv → e − + h + (O 2 ) aq + e − → ·O 2 − h + + H 2 O → H + + ·OH h + + OH − ⇌ ·OH ·O 2 − + H + → ·OOH ·OOH + ·O 2 − + H + → O 2 + H 2 O 2 H 2 O 2 + ·O 2 − → ·OH + OH − + O 2 …”

Section: Introductionmentioning

confidence: 99%

New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation

et al. 2018

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The effect of Fe segregation on the photocatalytic growth of Ag nanoparticles on rutile TiO2(001)

Cited by 19 publications

References 25 publications

Synthesis and evaluations of Fe3O4–TiO2–Ag nanocomposites for photocatalytic degradation of 4-chlorophenol (4-CP): effect of Ag and Fe compositions

Synthesis and evaluations of Fe3O4–TiO2–Ag nanocomposites for photocatalytic degradation of 4-chlorophenol (4-CP): effect of Ag and Fe compositions

Enhanced Photocatalytic Reduction of Cr(VI) by Combined Magnetic TiO2-Based NFs and Ammonium Oxalate Hole Scavengers

New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation

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