Studies on the Mineralization and Separation Efficiencies of a Magnetic Photocatalyst

Beydoun, Donia; Amal, Rose; Scott, Jason; Low, Gary; McEvoy, Stephen R.

doi:10.1002/1521-4125(200107)24:7<745::aid-ceat745>3.0.co;2-d

Cited by 58 publications

(32 citation statements)

References 8 publications

(13 reference statements)

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“…Beydoun et al [11][12][13] reported that magnetic photocatalyst had been prepared by coating titania particles onto Fe 3 O 4 particles. However, the nanosized core magnetic material of Fe 3 O 4 is easily oxidized [14].…”

Section: Introductionmentioning

confidence: 99%

Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi₁₂TiO₂₀supported on nickel ferrite

Shangguan²,

Yuan

et al. 2007

Science and Technology of Advanced Materials

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A magnetically separable photocatalyst Bi 12 TiO 20 /SiO 2 /NiFe 2 O 4 (BSN) with a typical ferromagnetic hysteresis was prepared by a simple process: the magnetic 200 wt% SiO 2 /NiFe 2 O 4 (SN) dispersion prepared by a liquid catalytic phase transformation method and the visible-light-active photocatalyst Bi 12 TiO 20 prepared by a simple coprecipitation processing were mixed, sonificated, dried, and calcined at 550 1C. The prepared photocatalyst showed high photocatalytic activity for the degradation of methyl orange in water under UV irradiation and visible-light irradiation (l4400 nm), and it was easy to be separated from a slurry-type photoreactor under the application of an external magnetic field, being one of promising photocatalysts for wastewater treatment. Transmission electron microscope (TEM) and X-ray diffractometer (XRD) were used to characterize the structure of the photocatalyst, indicating that the magnetic SN particles adhered to the surface of the Bi 12 TiO 20 congeries. SiO 2 layer round the surface of NiFe 2 O 4 nanoparticles prevented effectively the injection of charges from TiO 2 particles to NiFe 2 O 4 , which gave rise to the increase in photocatalytic activity. r

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Section: Introductionmentioning

confidence: 99%

Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi₁₂TiO₂₀supported on nickel ferrite

Shangguan²,

Yuan

et al. 2007

Science and Technology of Advanced Materials

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“…Many studies proved that slurrytype reactors are much more efficient than immobilised-catalyst type reactor Beydoun et al 2001;de Lassa, Serrano & Salaices 2005;Geissen et al 2001). The comparisons between photocatalytic slurry-type reactors and immobilised-type reactors are described in Table 1.…”

Section: Tio2 In Wastewatermentioning

confidence: 99%

“…Therefore, one approach is to develop a stable magnetic photocatalyst for easy recovery by applying external magnetic field. The development of magnetic photocatalyst for environmental remediation has been numerously reported in literatures (Beydoun 2000;Beydoun et al 2001;Bruce et al 2004;Buske 1994;Chambers, Droubay & Kaspar 2006;Chen, Deng & Zhang 2010;Chen et al 2009a;Chen et al 2009b;Chen et al 2009c;Fukumura, Toyosaki & Yamada 2005;Gad-Allah et al 2008;Gad-Allah et al 2009;Hai 2009;He et al 2008;Li et al 2009;Nunes et al 2006;Philipse, van Bruggen & Pathmamanoharan 1994;Tural, Ozkan & Volkan 2009;Watson, Beydoun & Amal 2002;Watson et al 2005;Wen et al 2009;Xu, Bao & Zhang 2005;Xu et al 2007;Xu et al 2008;Xuan et al 2009;. Various magnetic cores had been used to develop magnetic TiO 2 which is summarized in Table 2.…”

Section: Magnetised Tiomentioning

confidence: 99%

“…For about a decade, the development of magnetic photocatalyst for environmental remediation has been numerously reported in literatures (Beydoun 2000;Beydoun et al 2001;Bruce et al 2004;Buske 1994 Xu et al 2008;Xuan et al 2009;. However, this review paper is based on more into extensive studies on producing an ideal magnetic photocatalyst using magnetite and TiO 2 as the raw materials Chen et al 2009a;Watson, Beydoun & Amal 2002;Watson et al 2005).…”

Section: )mentioning

confidence: 99%

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Magnetised titanium dioxide (TiO₂) for water purification: preparation, characterisation and application

Shahid

McDonagh

Kim

et al. 2014

Desalination and Water Treatment

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The study of titanium dioxide (TiO 2 ) as a photocatalyst for water purification has attracted significant attention over the past four decades. However, the separation of photocatalyst from water suspension may be difficult, costly and jeopardize the use of this water treatment technology. Recently, the development and production of magnetised TiO 2 have been achieved to offer a solution for the photocatalyst separation problem. This paper discusses the preparation techniques, characterisation and the applications of magnetised TiO 2 . Many researchers have studied magnetised TiO 2 photocatalysts but the lack of articles discussing the water purification processes is still slowing any advance in this field. Here, the progress of the scientific research on preparation techniques to coat magnetic particles by materials such as organic polymers, silica, magnesia and alumina are reviewed to compare and discuss recent findings. The doping of photoactive TiO 2 photocatalyst into the magnetic coated particles is also emphasised. In addition, the characterisation of magnetised TiO 2 in terms of physicochemical properties and operating conditions produced by each technique are critically reviewed. Moreover, examples of applications of TiO 2 and magnetised TiO 2 photocatalyst in water purification are summarised. In general, the effectiveness of organic removal by magnetised TiO 2 is still lower compared to single phase TiO 2 . The future prospect of this field is deliberated to develop a novel, economic and efficient magnetised TiO 2 photocatalyst, which has high organic removal properties.

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“…Preparation of a magnetic photocatalyst by coating TiO 2 particles onto iron oxide have been reported by Beydoun and coworkers (Beydoun et al 2000(Beydoun et al , 2001. This technique has been shown to provide an excellent photocatalytic activity and efficient magnetic recovery (Jing et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Efficient photocatalytic degradation of organic pollutants by magnetically recoverable nitrogen-doped TiO2 nanocomposite photocatalysts under visible light irradiation

Hamzezadeh-Nakhjavani

Tavakoli

Akhlaghi

et al. 2015

Environ Sci Pollut Res

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Preparation of novel nanocomposite particles (NCPs) with high visible-light-driven photocatalytic activity and possessing recovery potential after advanced oxidation process (AOP) is much desired. In this study, pure anatase phase titania (TiO2) nanoparticles (NPs) as well as three types of NCPs including nitrogen-doped titania (TiO2-N), titania-coated magnetic silica (Fe3O4 cluster@SiO2@TiO2 (FST)), and a novel magnetically recoverable TiO2 nanocomposite photocatalyst containing nitrogen element (Fe3O4 cluster@SiO2@TiO2-N (FST-N)) were successfully synthesized via a sol-gel process. The photocatalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM) with an energy-dispersive X-ray (EDX) spectroscopy analysis, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), and vibrating sample magnetometer (VSM). The photocatalytic activity of as-prepared samples was further investigated and compared with each other by degradation of phenol, as a model for the organic pollutants, in deionized (DI) water under visible light irradiation. The TiO2-N (55 ± 1.5%) and FST-N (46 ± 1.5%) samples exhibited efficient photocatalytic activity in terms of phenol degradation under visible light irradiation, while undoped samples were almost inactive under same operating conditions. Moreover, the effects of key operational parameters, the optimum sample calcination temperature, and reusability of FST-N NCPs were evaluated. Under optimum conditions (calcination temperature of 400 °C and near-neutral reaction medium), the obtained results revealed efficient degradation of phenol for FST-N NCPs under visible light irradiation (46 ± 1.5%), high yield magnetic separation and efficient reusability of FST-N NCPs (88.88% of its initial value) over 10 times reuse.

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Studies on the Mineralization and Separation Efficiencies of a Magnetic Photocatalyst

Cited by 58 publications

References 8 publications

Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi₁₂TiO₂₀supported on nickel ferrite

Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi₁₂TiO₂₀supported on nickel ferrite

Magnetised titanium dioxide (TiO₂) for water purification: preparation, characterisation and application

Efficient photocatalytic degradation of organic pollutants by magnetically recoverable nitrogen-doped TiO2 nanocomposite photocatalysts under visible light irradiation

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Studies on the Mineralization and Separation Efficiencies of a Magnetic Photocatalyst

Cited by 58 publications

References 8 publications

Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi12TiO20supported on nickel ferrite

Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi12TiO20supported on nickel ferrite

Magnetised titanium dioxide (TiO2) for water purification: preparation, characterisation and application

Efficient photocatalytic degradation of organic pollutants by magnetically recoverable nitrogen-doped TiO2 nanocomposite photocatalysts under visible light irradiation

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Product

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Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi₁₂TiO₂₀supported on nickel ferrite

Preparations and photocatalytic degradation of methyl orange in water on magnetically separable Bi₁₂TiO₂₀supported on nickel ferrite

Magnetised titanium dioxide (TiO₂) for water purification: preparation, characterisation and application