Synthesis and characterisation of clay-supported titania photocatalysts

Daniel, Lisa M.; Frost, Ray L.; Zhu, Hua

doi:10.1016/j.jcis.2007.08.023

Cited by 54 publications

(31 citation statements)

References 42 publications

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“…clearly shows the presence of discrete anatase particles in TiO 2 /NCC structure [23]. The two characteristic peaks at 1554 and 1492 cm −1 in P(Py-co-An)-TiO 2 /NCC correspond to the frequencies of aromatic ring in PAn, which are stretching of quinine ring and benzene rings, respectively [24].…”

Section: Ftir Analysismentioning

confidence: 92%

Photocatalytic Degradation of Eosin Yellow Using Poly(pyrrole-co-aniline)-Coated TiO₂/Nanocellulose Composite under Solar Light Irradiation

Anirudhan

Rejeena

2015

Journal of Materials

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The present study describes the feasibility of a novel adsorbent cum photocatalyst, poly(pyrrole-co-aniline)-coated TiO 2 /nanocellulose composite (P(Py-co-An)-TiO 2 /NCC), to remove eosin yellow (EY) from aqueous solutions. The removal of EY was investigated by batch adsorption followed by photocatalysis. The effect of various adsorption parameters like adsorbent dose, pH, contact time, initial concentration, and ionic strength has been optimized for treating effluents from the dye industry. Adsorption of EY reached maximum at pH 4.5 and complete removal of dye was achieved using 3.5 g/L of P(Py-co-An)-TiO 2 /NCC. Adsorption equilibrium data were fitted with Langmuir and Fritz-Schlunder isotherm models and the kinetics of adsorption follows a secondorder mechanism. The adsorption capacity of P(Py-co-An)-TiO 2 /NCC was found to be 3.39 × 10 −5 mol/g and reached equilibrium within 90 min. The photocatalytic degradation of adsorbed dye under sunlight was possible and about 92.3% of dye was degraded within 90 min. The reusability of P(Py-co-An)-TiO 2 /NCC was also investigated. The results indicate that P(Py-co-An)-TiO 2 /NCC is the best material for the wiping out of EY from aqueous solutions.

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Section: Ftir Analysismentioning

confidence: 92%

Photocatalytic Degradation of Eosin Yellow Using Poly(pyrrole-co-aniline)-Coated TiO₂/Nanocellulose Composite under Solar Light Irradiation

Anirudhan

Rejeena

2015

Journal of Materials

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“…showed that the samples prepared with different hydrothermal treatment temperatures exhibited the following trend in photoactivity: Ti-L40-180 > Ti-L40-140 > Ti-L40-80 [16]. Titania is commonly reported to exhibit greatest activity with samples of smaller crystallite size, however, in this case, the larger samples produced by more severe hydrothermal treatment are the most photoactive.…”

Section: Effect Of Hydrothermal Treatment Temperaturementioning

confidence: 97%

“…The samples are ranked by the degree of degradation achieved over 90 minutes of irradiation by UV light, and are as follows: Ti-L40-180 > Ti-L30-180 > Ti-L10-180 > Ti-L20-180 [16]. The Ti concentration was therefore found to have some effect on the photocatalytic activity of the sample, however there is no direct relationship present.…”

Section: Effect Of Titania Concentrationmentioning

confidence: 99%

“…The aim of this paper is to build on previous reported characterisations of laponite-supported titania, examining the elemental composition of the samples and the surface area and porosity, through the use of scanning electron microscopy (SEM) [16] and BET N 2 sorption experiments. The effect of Ti concentration and surface area on the photoactivity of the samples is examined.…”

Section: Introductionmentioning

confidence: 99%

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Laponite-supported titania photocatalysts

Daniel

Frost

Zhu

2008

Journal of Colloid and Interface Science

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This study builds on previous results published on the synthesis and characterisation of laponite-supported titania photocatalysts. Titania nanocrystals are prepared prior to addition to the clay dispersion, by a sol-gel synthesis incorporating a microwave hydrothermal step. In addition to previously examinations with XRD, TEM and FT-IR, the samples are further characterised with SEM, 29 Si NMR and BET N 2 sorption to gain an insight into the effect of Ti concentration and surface area on the photoactivity of the samples.Keywords: Titania; Photocatalyst; Laponite; Colloid, Surfactant, Hydrothermal treatment. IntroductionThe investigation of methods to enhance the photoactivity of titania materials has attracted much attention due to its' ability to be used for the removal of environmental pollutants [1][2][3][4][5][6]. One such method of enhancement is the support of fine titania particles on an inorganic surface. As fine titania nanoparticles experience 2 an inherent degree of aggregation, stabilisation on a support medium can reduce this, whilst still allowing for the exposure of more active sites which may participate in a photoreaction. TiO 2 particles have been immobilised on silica nanospheres [7] and thin films [8][9][10][11], on Fe-filled carbon nanocapsules [12], within the interlayer spaces of pillared clays [4,13] and on the surface of exfoliated clay sheets, such as laponite .Laponite is a synthetic hectorite, which forms exfoliated silicate layers when dispersed in water [14]. It has a relatively small particle size, with a basic unit consisting of a layered hydrous magnesium silicate platelet of diameter 25-30 nm with a thickness of approximately 1 nm [15]. When laponite powder is dispersed in water, a strongly negative charge appears on the faces of the silicate sheets and a weak positive charge appears on the rim. As a result of these charges, Laponite exhibits face-edge aggregation which leads to relatively open, macroporous structures of aggregates, described as house-of-cards structures. By utilising a surfactant to prevent the formation of this house of cards structure, TiO 2 may be immobilised on the clay face and the surfactant removed via calcination.The aim of this paper is to build on previous reported characterisations of laponite-supported titania, examining the elemental composition of the samples and the surface area and porosity, through the use of scanning electron microscopy (SEM)[16] and BET N 2 sorption experiments. The effect of Ti concentration and surface area on the photoactivity of the samples is examined. Laponite) employed was 2:1. Preparation of TiO 2 -clay photocatalystsTo the clay dispersions TiO 2 sol was added with Ti:clay ratios of 10, 20, 30and 40mmol of Ti/g of clay. All samples were stirred for 3 hours, hydrothermally treated at 180ºC for a period of 24 hours, upon which they were centrifuged, washed with deionised water and dried in an oven at 80ºC. They were then calcined at 500ºCfor a period of 24 hours. To examine the effect of the washing medium, sa...

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“…Three main reactions that occur during the sol-gel process are hydrolysis, alcohol condensation and water condensation. The reaction is as follows [27]…”

Section: Experimental Procedures a Powder Synthesismentioning

confidence: 99%

Reduction of Organic Dye Using Anatase Tio2 Nanocrystallites under Solar-Irradiation: Effect of Particle Size

Juliet¹

2017

IJRASET

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Anatase titanium oxide (TiO 2 ) nanocrystallites with tetragonal structure (4/mmm) and space group I4 1 /amd-D 4h 19 were synthesized via sol-gel route, followed by calcination at two different temperatures 400 and 600 °C, to study the effect on photocatalytic reduction of methyl orange (MO) dye. Structural parameters and its variation with calcination temperature for the prepared samples were analyzed using X-ray diffraction pattern. The metal-oxide phase formation was again confirmed from the band assignments of the Fourier transform infrared spectra. Effect of calcination temperature on particle size of the TiO 2 samples was accurately analyzed directly from transmission electron micrographs. Elemental analysis has been performed to identify the purity of the prepared samples. The optical parameters were extracted from the optical absorption data, the band gap values of the TiO 2 powder sample varies from 3.24 to 3.06 eV as calcination temperature increases. The photocatalytic activities of the products were evaluated by studying the degradation of MO dye in aqueous solution by direct solar irradiation. The anatase TiO 2 calcined at 400 o C shows 100 % degradation of MO because of its smaller particle size (9.8 nm) exactly at 3.5 h.Based on the obtained results, the particle size of TiO 2 powders has pronounced influence in photocatalytic activity.

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Synthesis and characterisation of clay-supported titania photocatalysts

Cited by 54 publications

References 42 publications

Photocatalytic Degradation of Eosin Yellow Using Poly(pyrrole-co-aniline)-Coated TiO₂/Nanocellulose Composite under Solar Light Irradiation

Photocatalytic Degradation of Eosin Yellow Using Poly(pyrrole-co-aniline)-Coated TiO₂/Nanocellulose Composite under Solar Light Irradiation

Laponite-supported titania photocatalysts

Reduction of Organic Dye Using Anatase Tio2 Nanocrystallites under Solar-Irradiation: Effect of Particle Size

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Synthesis and characterisation of clay-supported titania photocatalysts

Cited by 54 publications

References 42 publications

Photocatalytic Degradation of Eosin Yellow Using Poly(pyrrole-co-aniline)-Coated TiO2/Nanocellulose Composite under Solar Light Irradiation

Photocatalytic Degradation of Eosin Yellow Using Poly(pyrrole-co-aniline)-Coated TiO2/Nanocellulose Composite under Solar Light Irradiation

Laponite-supported titania photocatalysts

Reduction of Organic Dye Using Anatase Tio2 Nanocrystallites under Solar-Irradiation: Effect of Particle Size

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Photocatalytic Degradation of Eosin Yellow Using Poly(pyrrole-co-aniline)-Coated TiO₂/Nanocellulose Composite under Solar Light Irradiation

Photocatalytic Degradation of Eosin Yellow Using Poly(pyrrole-co-aniline)-Coated TiO₂/Nanocellulose Composite under Solar Light Irradiation