Preparation and characterization of magnetic TiO2 nanoparticles and their utilization for the degradation of emerging pollutants in water

Álvarez, Pedro M.; Jaramillo, J.; López-Piñero, Francisco; Pluciński, P.

doi:10.1016/j.apcatb.2010.08.010

Cited by 180 publications

(101 citation statements)

References 18 publications

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“…Despite their effectiveness, many of them present disadvantages like transfer of pollutants, long degradation times and loss of valuable materials (catalysts) [1,2]. Development of new technologies to achieve the degradation of phenol in a suitable way becomes then necessary.…”

Section: Introductionmentioning

confidence: 99%

“…Elimination of phenolic compounds in wastewaters has been widely studied by different processes such as biological treatments, photocatalysis, adsorption, electrochemical oxidation, and Photo-Fenton oxidation [1][2][3][4]. Despite their effectiveness, many of them present disadvantages like transfer of pollutants, long degradation times and loss of valuable materials (catalysts) [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…However, the separation of the nanoparticles from the aqueous solution once the process has finished represents a major drawback for their application. Supported titanium dioxide can face this inconvenient by allowing an easy separation of the catalysts from the reagents and products, as well as a lesser product contamination and high adaptability to continuous processes [1,2,6].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Herrera

Reyes

Colina–Márquez

2016

J. Phys.: Conf. Ser.

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Abstract. Photocatalytic activity of iron oxide (IO) nanoparticles functionalized with TiO 2 was evaluated through photodegradation of phenol under UV irradiation. For this, magnetic nanoparticles were synthesized by co-precipitation method obtaining aggregates with a size of 46nm. The IO nanoparticles were encapsulated in a polysiloxane matrix and then functionalized with TiO 2 at 25°C (sample A: 0.1g TiO 2 and B: 0.3g TiO 2 ). Photodegradation experiments were carried out for six hours at pH 3.0 using concentrations of IO-TiO 2 nanoparticles of 0.2, 0.5, and 1.0g/L. A maximum amount of 89% of phenol photodegradation was achieved by using 0.2g/L of the IO-TiO 2 -B sample. In addition, it was evaluated the possibility to re-using the nanomaterial after magnetic separation. For this, 0.2g/L of B sample were submitted for five cycles of photodegradation. A stable photocatalytic activity was observed as well as the nanoparticles were regenerated by calcination among cycles, which suggests the versatility of these nanoparticles for the photodegradation of organic pollutants.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Herrera

Reyes

Colina–Márquez

2016

J. Phys.: Conf. Ser.

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“…The literature has offered methodologies for the coating of magnetite with titania and also for the post-coating of silica-coated magnetite with titania, however, most of them resulted in poor morphological control and are still far from a core-shell like structure. Alvarez et al 65 reported a very simple method based on the treatment of an aqueous suspension of magnetite with isopropyl alcohol and then with TTIP. This method resulted in a magnetite-titania composite with poor control of the morphology, although it could be improved when a layer of silica was added before the coating with titania.…”

Section: Going Beyond Silicamentioning

confidence: 99%

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

Rossi¹,

Garcia²,

Vono³

2012

J. Braz. Chem. Soc.

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O objetivo deste Account é fornecer uma visão geral de nossas atividades atuais de pesquisa, as quais envolvem a síntese e modificação de nanomateriais superparamagnéticos para aplicação na área de separação magnética e catálise. Primeiramente, uma introdução ao magnetismo e à separação magnética é feita. Em seguida, estratégias sintéticas que têm sido desenvolvidas para gerar nanopartículas superparamagnéticas revestidas esfericamente por sílica e outros óxidos, com destaque a sistemas bem caracterizados e preparados por metodologias que geram amostras de elevada qualidade e que, a princípio, podem ser produzidas em maior escala, são discutidas. Uma série de catalisadores magneticamente recuperáveis preparados em nosso grupo de pesquisa pela combinação única de suportes superparamagnéticos e nanopartículas metálicas é destacada. Este Account é concluído com observações pessoais e perspectivas neste campo de pesquisa.The aim of this Account is to provide an overview of our current research activities on the design and modification of superparamagnetic nanomaterials for application in the field of magnetic separation and catalysis. First, an introduction of magnetism and magnetic separation is done. Then, the synthetic strategies that have been developed for generating superparamagnetic nanoparticles spherically coated by silica and other oxides, with a focus on well characterized systems prepared by methods that generate samples of high quality and easy to scale-up, are discussed. A set of magnetically recoverable catalysts prepared in our research group by the unique combination of superparamagnetic supports and metal nanoparticles is highlighted. This Account is concluded with personal remarks and perspectives on this research field.

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“…10,14 In addition, the presence of the insulation SiO 2 layer between the magnetic core and the TiO 2 shell prevents photodissolution of iron and enhances the stability in aqueous solution under UV illumination. 15 Furthermore, the intermediate SiO 2 barrier prevented the magnetic core from acting as an electron-hole recombination center, which can negatively affect the photocatalytic activity. 16,17 So far, Beydoun et al have been pioneers in discussing the synthesis and characterization of these magnetic nanoparticles for photocatalytic reaction.…”

mentioning

confidence: 99%

Separation of Selenite from Inorganic Selenium Ions using TiO₂Magnetic Nanoparticles

Kim¹,

Lim²

2013

Bulletin of the Korean Chemical Society

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A simple and quick separation technique for selenite in natural water was developed using TiO 2 @SiO 2 /Fe 3 O 4 nanoparticles. For the synthesis of nanoparticles, a polymer-assisted sol-gel method using hydroxypropyl cellulose (HPC) was developed to control particle dispersion in the synthetic procedure. In addition, titanium butoxide (TBT) precursor, instead of the typical titanium tetra isopropoxide, was used for the formation of the TiO 2 shell. The synthesized nanoparticles were used to separate selenite (Se 4+) in the presence of Se 6+ or selenium anions for the photocatalytic reduction to Se 0 atom on the TiO 2 shell, followed by magnetic separation using Fe 3 O 4 nanoparticles. The reduction efficiency of the photocatalytic reaction was 81.4% at a UV power of 6W for 3 h with a dark adsorption of 17.5% to the nanoparticles, as determined by inductively coupled plasma-mass spectrometry (ICP-MS). The developed separation method can be used for the speciation and preconcentration of selenium cations in environmental and biological analysis.

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Preparation and characterization of magnetic TiO2 nanoparticles and their utilization for the degradation of emerging pollutants in water

Cited by 180 publications

References 18 publications

Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

Separation of Selenite from Inorganic Selenium Ions using TiO₂Magnetic Nanoparticles

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Preparation and characterization of magnetic TiO2 nanoparticles and their utilization for the degradation of emerging pollutants in water

Cited by 180 publications

References 18 publications

Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

Separation of Selenite from Inorganic Selenium Ions using TiO2Magnetic Nanoparticles

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Product

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Separation of Selenite from Inorganic Selenium Ions using TiO₂Magnetic Nanoparticles