Synergistic effect of bifunctional Co–TiO2 catalyst on degradation of Rhodamine B: Fenton-photo hybrid process

Chen, Qingkong; Ji, Fangying; Liu, Tingyi; Yan, Peng; Guan, Wei; Xu, Xuan

doi:10.1016/j.cej.2013.04.024

Cited by 76 publications

(18 citation statements)

References 32 publications

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“…Therefore, rutile and brookite phases have not been detected [31,32]. The XRD patterns of Co/TiO 2 samples didn't show any cobalt phase indicating that cobalt ions uniformly dispersed among the anatase crystallites [2,[33][34][35]. Also, the shape of diffraction of pure TiO 2 is quite similar to that of Co/TiO 2 samples.…”

Section: Xrd Analysismentioning

confidence: 97%

Co/TiO2 nanoparticles: preparation, characterization and its application for photocatalytic degradation of methylene blue

Pirbazari¹,

Monazzam²,

Kisomi³

2018

Preprint

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a b s t r ac tIn this work, TiO 2 nanoparticles containing different amounts of cobalt were synthesized by sol-gel method using titanium (IV) isopropoxide and cobalt chloride as titanium and cobalt precursors, respectively. X-ray diffraction (XRD) results showed prepared samples include 100% anatase phase. The presence of cobalt in TiO 2 nanoparticle network was established by XRD, scanning electron microscopy equipped with energy dispersive X-ray microanalysis (SEM-EDX), Fourier transform infrared (FT-IR) and N 2 physisorption techniques. The increase of cobalt doping enhanced redshift in the diffuse reflectance spectra. The photocatalytic activity of the prepared samples was tested for degradation of methylene blue (MB) as a model of dye. Although the photocatalytic activity of pure TiO 2 was found to be higher than that of Co/TiO 2 samples under UV irradiation, the presence of 0.24% cobalt dopant in TiO 2 nanoparticles resulted in a photocatalyst with the highest activity under visible light.

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Section: Xrd Analysismentioning

confidence: 97%

Co/TiO2 nanoparticles: preparation, characterization and its application for photocatalytic degradation of methylene blue

Pirbazari¹,

Monazzam²,

Kisomi³

2018

Preprint

View full text Add to dashboard Cite

show abstract

“…After 4th cycle, the rate constant was significantly reduced in a way that it reached to 0.0202 min -1 in 5th cycle of the catalyst reuses indicating deactivation of FTNs occurred. This deactivation can be attributed to the formation of complexes of intermediates with catalyst surface preventing PMS activation and production of free radicals [20,34,35].…”

Section: Reusability and Stabilitymentioning

confidence: 98%

Photocatalytic degradation of food dye by Fe3O4–TiO2 nanoparticles in presence of peroxymonosulfate: The effect of UV sources

Zazouli

Ghanbari

Yousefi

et al. 2017

Journal of Environmental Chemical Engineering

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“…Heterogeneous catalysis combined with or without radiation, has received attention from diverse research groups, mainly focusing on cobalt oxides . Among them, heterogeneous combination with photocatalysts, such as titanium dioxide, is drawing attention due to enhancement of PMS decomposition. Cobalt with titania acts as an active center for PMS decomposition:

{normalC normalo}^{2 prefix+} + {normalH normalS normalO}_{5}^{-} \to {normalC normalo}^{3 prefix+} + {SO}_{4}^{• prefix-} + {normalH normalO}^{-}

{normalC normalo}^{sans-serif3 prefix+} + {normalH normalS normalO}_{5}^{-} \to {normalC normalo}^{2 prefix+} + {SO}_{5}^{• prefix-} + H^{+}

Photocatalytic decomposition of PMS can also be launched in the presence of radiation and a photocatalyst:

{normalT normali normalO}_{2} + normalh ν \to e_{normalC normalB}^{-} + h_{normalV normalB}^{+}

{normalH normalS normalO}_{5}^{-} + e_{normalC normalB}^{-} \to {SO}_{4}^{• prefix-} + {normalH normalO}^{-}

{normalH normalS normalO}_{5}^{-} + e_{normalC normalB}^{-} \to {SO}_{4}^{2 prefix-} + {normalH normalO}^{•}

…”

Section: Introductionmentioning

confidence: 99%

Synergism between peroxymonosulfate and LaCoO₃‐TiO₂ photocatalysis for oxidation of herbicides. Operational variables and catalyst characterization assessment

Solís

Rivas

Gimeno

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND This paper reports the use of novel coupled LaCoO3‐TiO2 as photocatalyst with double route of peroxymonosulfate (PMS) activation. First, as a photocatalyst due to titania; and second, through PMS heterogeneous decomposition onto LaCoO3 particles. Thus, photocatalytical activity was tested for removing a mixture of four herbicides of different recalcitrance (metazachlor, tembotrione, tritosulfuron and ethofumesate). RESULTS The presence of light and PMS highly enhanced herbicides removal rate: 3.5–5 times increases were obtained with UVA light. Oxidant concentration, catalyst load, pH and temperature were assessed. Herbicides were completely oxidized depending on their recalcitrant nature and the operational variables. 55% TOC conversion was reached using Oxone® 5 × 10−4 mol L−1. Phytotoxicity assays denoted no inhibition after 180 min of photocatalytic treatment (∼80% initial inhibition). Solid properties of Co/Ti = 0.1:1 ratio were studied by means of SEM (LaCoO3 aggregates linked to a variety of shapes and sizes of TiO2), XRF (6.1% of LaCoO3), XPS (superficial Co3+, La3+ and Ti4+), XRD (anatase, rutile and rhombohedral LaCoO3) and UV–vis diffuse reflectance (visible range absorption and bandgap of 2.88 eV for TiO2). CONCLUSION Catalysts based on LaCoO3‐TiO2 combined with peroxymonosulfate seem to be suitable for removing organic pollutants, with a moderate conversion of TOC and elimination of toxicity. © 2017 Society of Chemical Industry

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Synergistic effect of bifunctional Co–TiO2 catalyst on degradation of Rhodamine B: Fenton-photo hybrid process

Cited by 76 publications

References 32 publications

Co/TiO2 nanoparticles: preparation, characterization and its application for photocatalytic degradation of methylene blue

Co/TiO2 nanoparticles: preparation, characterization and its application for photocatalytic degradation of methylene blue

Photocatalytic degradation of food dye by Fe3O4–TiO2 nanoparticles in presence of peroxymonosulfate: The effect of UV sources

Synergism between peroxymonosulfate and LaCoO₃‐TiO₂ photocatalysis for oxidation of herbicides. Operational variables and catalyst characterization assessment

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Synergistic effect of bifunctional Co–TiO2 catalyst on degradation of Rhodamine B: Fenton-photo hybrid process

Cited by 76 publications

References 32 publications

Co/TiO2 nanoparticles: preparation, characterization and its application for photocatalytic degradation of methylene blue

Co/TiO2 nanoparticles: preparation, characterization and its application for photocatalytic degradation of methylene blue

Photocatalytic degradation of food dye by Fe3O4–TiO2 nanoparticles in presence of peroxymonosulfate: The effect of UV sources

Synergism between peroxymonosulfate and LaCoO3‐TiO2 photocatalysis for oxidation of herbicides. Operational variables and catalyst characterization assessment

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Synergism between peroxymonosulfate and LaCoO₃‐TiO₂ photocatalysis for oxidation of herbicides. Operational variables and catalyst characterization assessment