TiO2-modified zeolites for fluoroquinolones removal from wastewaters and reuse after solar light regeneration

Maraschi, Federica; Sturini, Michela; Speltini, Andrea; Pretali, Luca; Profumo, Antonella; Pastorello, Anna; Kumar, Vimal; Ferretti, M.; Caratto, Valentina

doi:10.1016/j.jece.2014.08.009

Cited by 39 publications

(33 citation statements)

References 31 publications

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“…According to the literature data, NTD/Y nanocomposites combine the properties of the initial components: photocatalytic (Domoroshchina et al 2017;Kuwahara et al 2012;Wang et al 2008Wang et al , 2015Kamegawa et al 2013;Jansson et al 2015;Maraschi et al 2014), adsorption (Domoroshchina et al 2017;Kravchenko et al 2016;Zendehdel et al 2014), and bactericidal (Domoroshchina et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Basic Violet 10 in suspension (Wang et al 2008), marbofloxacin and enrofloxacin in water (Maraschi et al 2014), Methyl Orange dye in water (Domoroshchina et al 2017;Wang et al 2015), formaldehyde and trichloroethylene in gas phase under UV (Jansson et al 2015) and the degradation of 2-propanol in water under visible light (Kamegawa et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The following methods are currently used for the synthesis of nanocomposites NTD/Y: -Ion exchange between the Na + and NH 4+ forms of zeolite Y in an aqueous solution of (NH 4 ) 2 (TiNO)(C 2 O 4 ) 2 followed by calcination at 400-550 °C (nanocrystalline NTD in NTD/Y) (Liu et al 1992;Zhang et al 1995;Alwash et al 2013;Easwaramoorthi and Natarajan 2009); -Wet impregnation of zeolite NaY (Alwash et al 2013;Kuwahara et al 2012;Wang et al 2008) or HY (Kamegawa et al 2013) with a TiO 2 sol followed by evaporation of the liquid, drying, and calcination at 350-600 °C (amorphous (Alwash et al 2013) or nanocrystalline (Wang et al 2008) NTD in NTD/Y); -Mechanical mixing of NTD, which was synthesized by the sol-gel method (Maraschi et al 2014), via the hydrolysis of titanium isopropoxide (Xu and Langford 1997) or a solution of titanium tetraisopropoxide in ethanol (Ito et al 2014), with HY zeolite (Maraschi et al 2014) or NaY zeolite (Xu and Langford 1997;Ito et al 2014); the separation of the precipitate, washing, drying, and annealing at 350-450 °C [nanocrystalline NTD in NTD/Y (Xu and Langford 1997;Ito et al 2014)]; -A sol-gel method using titanate n-butyl acetate followed by annealing at 400 °C (Easwaramoorthi and Natarajan 2009;Wang et al 2015), the degree of crystallinity of the composite decreases with an increase in TiO 2 loading (Easwaramoorthi and Natarajan 2009) In NTD/Y nanocomposites synthesized by the ion exchange reaction (Liu et al 1992;Zhang et al 1995;Alwash et al 2013), nanocrystalline NTD occupies zeolite cavities (group II), as it was demonstrated by X-ray photoelectron spectroscopy (XPS), IR spectroscopy, X-ray powder diffraction, scanning (SEM) and transmission electron microscopy (TEM). In NTD/Y synthesized by wet impregnation (Alwash et al 2013;Jansson et al 2015) or mechanical mixing techniques (Maraschi et al 2014), amorphous …”

Section: Introductionmentioning

confidence: 99%

“…In NTD/Y synthesized by wet impregnation (Alwash et al 2013;Jansson et al 2015) or mechanical mixing techniques (Maraschi et al 2014), amorphous (Alwash et al 2013), and presumably, nano-anatase (Jansson 1 3 et al 2015) are present only on the surface of the zeolite (group I) [Energy-dispersive X-ray spectroscopy (EDS), X-ray powder diffraction]. The application of the sol-gel method results in the formation of samples containing amorphous NTD both on the surface and within the zeolite framework (groups I + II) [IR spectroscopy, X-ray powder diffraction, SEM, Brunauer-Emmett-Teller method (BET)] (Wang et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…An increase in the NTD loading leads to the filling of the zeolite pores and the partial location of amorphous NTD on the zeolite surface (groups I + II) (Wang et al 2015), whereas smaller NTD particles promote a more uniform distribution of NTD over the zeolite surface (group I) (Maraschi et al 2014) or the insertion of nanocrystalline NTD into the zeolite framework (group II) (Liu et al 1992;Zhang et al 1995). The amorphous state of the starting NTD facilitates a more uniform distribution of nanoparticles on the zeolite surface (group I) compared to nanocrystalline Degussa P25 (Maraschi et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Changing the characteristics and properties of zeolite Y and nano-anatase in the formation of a nano-anatase/Y composite with improved photocatalytic and adsorption properties

et al. 2018

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Zeolite Y and the NTD/Y nanocomposite, which were synthesized in situ (the addition of zeolite Y to the reaction mixture in the course of the synthesis of NTD by the sulfate method), were studied by a variety of methods. The decrease in the particle size (scanning electron microscopy) and the water content in pores (X-ray powder diffraction study, the full-profile Rietveld method, IR spectroscopy, differential scanning calorimetry), the increase in OH groups content and the decrease in the water content on the surface of zeolite (X-ray photoelectron spectroscopy) in the composition of NTD/Y compared to the initial zeolite Y were all established. A larger specific surface area of NTD/Y (Brunauer-Emmet-Teller method) compared to the initial zeolite Y is due to the fact that zeolite Y in the nanocomposite contains a smaller amount of water because of the synthesis conditions and the presence of nanocrystalline NTD on the surface of zeolite particles. It was found that NTD/Y nanocomposite exhibits a higher photocatalytic activity in the model decomposition reaction of methyl orange under UV and adsorption capacity for the extraction of P(V) and As(V) ions from aqueous media compared to the initial zeolite and pure NTD obtained under the same conditions, which differs from NTD/Y by the larger particle size, the smaller specific surface and the smaller content of OH groups and water on the surface. The role of Bronsted and Lewis centers in the realization of properties is discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Changing the characteristics and properties of zeolite Y and nano-anatase in the formation of a nano-anatase/Y composite with improved photocatalytic and adsorption properties

et al. 2018

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Methylene blue adsorption using chabazite: Kinetics and equilibrium modelling

Solisio

Aliakbarian

2017

Can J Chem Eng

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The adsorption of methylene blue from aqueous solution by a natural zeolite (chabazite) was studied. The effect of adsorbate concentration and pH were evaluated using raw and acid‐treated chabazite. Fourier transform infrared spectroscopy analysis revealed surface modification of acid‐treated chabazite, thus resulting in a decrease in adsorption capacity. The sorption kinetics and the equilibrium isotherms were evaluated. The pseudo‐second‐order model was found to be the most suited for kinetic results, and the Langmuir isotherm was chosen to better describe the sorption system. The results confirmed the efficacy of raw chabazite in removing almost all methylene blue fraction from the solution. The use of such a material, at low cost and easily available, can therefore represent a possible efficient way to remove dyes from effluent of many industries.

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