Functionalization of Electrospun Titanium Oxide Nanofibers with Silver Nanoparticles: Strongly Effective Photocatalyst

Kanjwal, Muzafar A.; Barakat, Nasser A.M.; Sheikh, Faheem A.; Khil, Myung-Seob; Kim, Hee Young

doi:10.1111/j.1744-7402.2009.02397.x

Cited by 61 publications

(25 citation statements)

References 40 publications

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“…Because of the well polycondensation property [25,26], titanium isopropoxide is a famous precursor to prepare TiO 2 nanofibers by using the electrospinning process and PVAc as a gelling polymer [27]. Addition of silver nitrate does not affect the nanofibrous morphology [5]. Fig.…”

Section: The Photocatalyst Characterizationmentioning

confidence: 99%

“…Afterward, excited electrons migrate to the metal, where they become trapped and the electron-hole pair recombination is suppressed. Therefore, many investigations have reported the enhancement of photoactivities in both liquid and gas phases [4,5]. Moreover, this incorporation provides an absorption feature due to the surface plasmon resonance (SPR) occurring over the visible range of the spectrum [6].…”

Section: Introductionmentioning

confidence: 99%

“…4-8 represent the photodegradation of rhodamine B using Ag-doped TiO 2 nanoparticles obtained from sol-gels contain 0.5, 1.0, 1.5, 2.0 and 2.5 wt% AgNO 3 , respectively at different temperatures(5,15,25, 45 and 55 • C). As shown in these figures, increase the silver content in the doped nanoparticles enhances Effect of temperature on the degradation rate of rhodamine B dye using Ag-doped TiO2 nanoparticles having 2.0 wt% AgNO3 under UV irradiation.…”

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confidence: 99%

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Influence of temperature on the photodegradation process using Ag-doped TiO2 nanostructures: Negative impact with the nanofibers

Barakat

Kanjwal

Chronakis

et al. 2013

Journal of Molecular Catalysis A: Chemical

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a b s t r a c tIn this study, the influence of the temperature on the photodegradation process using Ag-doped TiO 2 nanostructures was investigated. Two morphologies were used; nanoparticles and nanofibers. The nanofibers were synthesized by electrospinning of a sol-gel consisting of titanium isopropoxide, silver nitrate and poly(vinyl acetate). The silver nitrate amount was changed to produce nanofibers having different silver contents. Typically, sol-gels containing 0.5, 1.0, 1.5, 2.0 and 2.5 wt% silver nitrate were utilized. Calcination of the electrospun mats at 700 • C led to produce well morphology Ag-doped TiO 2 nanofibers for all formulations. The nanoparticles were prepared from the same sol-gels, however, instead of spinning the gels were dried, grinded and sintered at 700 • C. Photodegradation under UV irradiation for the rhodamine B at 5, 15, 25, 45 and 55 • C were performed. For the nanoparticles, increasing the temperature has positive impact as the best degradation was obtained at 55 • C. In contrast to the known influence of the temperature on the chemical reactions, in case of the nanofibrous morphology, the temperature has negative impact as the experimental work indicated that the optimum temperature is 25 • C. The observed strange effect of the temperature in case of the nanofibrous morphology indicates instant degradation of the dye molecules in the active zones surrounding the nanofibers. Therefore, the increase of temperature results in increase the kinetic energy of the dye molecules so the molecules escape from the active thin film surrounding the photocatalyst. Overall, this study shows that the nanofibrous morphology strongly enhances the surface activity of the photocatalyst which generates negative influence of the temperature.

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Section: The Photocatalyst Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Influence of temperature on the photodegradation process using Ag-doped TiO2 nanostructures: Negative impact with the nanofibers

Barakat

Kanjwal

Chronakis

et al. 2013

Journal of Molecular Catalysis A: Chemical

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133

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“…At specific time intervals, a 2-ml sample was withdrawn from the reactor and centrifuged to separate the residual nanofiber catalyst; then, the absorbance intensity was measured at the corresponding wavelength. 50 …”

Section: Methodsmentioning

confidence: 99%

Co₃O₄, ZnO, Co₃O₄-ZnO Nanofibers and Their Properties

Kanjwal¹,

Sheikh²,

Barakat³

et al. 2011

j nanoengng nanomfg

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Coupled nanofibers consisting of cobalt oxide (Co 3 O 4 and zinc oxide (ZnO) were prepared by the electrospinning process, and tested as a photocatalyst for dye degradation. Initially, electrospinning of a sol-gel consisting of cobalt acetate/zinc acetate/poly(vinyl alcohol) was used to produce polymeric nanofibers. Calcination of the obtained nanofibers in air at 600 C produced (Co 3 O 4 -ZnO) nanofibers. Scanning electron microscopy (SEM), and transmission electron microscopy (TEM), were employed to characterize the as-spun nanofibers and the calcined product. X-ray powder diffractometery (XRD) analysis was also used to characterize the chemical composition and the crystallographic structure of the produced nanofibers. Photodegradation of rhodamine B (RB) dye was studied individually using three photocatalysts: (Co 3 O 4 -ZnO) nanofibers, pristine (Co 3 O 4 and (ZnO) nanofibers. The (Co 3 O 4 -ZnO) nanofibers can eliminate all of the rhodamine B dye within about 90 min, however, the other two nanostructures could not totally eliminate all dye even after 3 h. Moreover, the tensile strength and the Young's modulus of coupled nanofibers were higher than that of pristine (CoAc/PVA) and (ZnAc/PVA) nanofibers. The increased mechanical properties of coupled nanofibers might be due to the chemical bonding between Zn 2+ and Co 2+ .

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“…The photocatalytic degradation of selected model DE and MB dye; in the presence of blank, ZnO, NiO and composite NiOZnO nanofibers was carried out in an indigenous glass photoreactor [11]. The reactor was made of glass (1000 ml capacity, 23 cm height and 15 cm diameter), covered with aluminum foil and equipped with a visible light source (sunlight lamp emitting source at a 2000-watt radiation).…”

Section: Photocatalytic Degradationmentioning

confidence: 99%

Electrospun NiO, ZnO and composite NiO–ZnO nanofibers/photocatalytic degradation of dairy effluent

Kanjwal

Chronakis

Barakat

2015

Ceramics International

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Functionalization of Electrospun Titanium Oxide Nanofibers with Silver Nanoparticles: Strongly Effective Photocatalyst

Cited by 61 publications

References 40 publications

Influence of temperature on the photodegradation process using Ag-doped TiO2 nanostructures: Negative impact with the nanofibers

Influence of temperature on the photodegradation process using Ag-doped TiO2 nanostructures: Negative impact with the nanofibers

Co₃O₄, ZnO, Co₃O₄-ZnO Nanofibers and Their Properties

Electrospun NiO, ZnO and composite NiO–ZnO nanofibers/photocatalytic degradation of dairy effluent

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Functionalization of Electrospun Titanium Oxide Nanofibers with Silver Nanoparticles: Strongly Effective Photocatalyst

Cited by 61 publications

References 40 publications

Influence of temperature on the photodegradation process using Ag-doped TiO2 nanostructures: Negative impact with the nanofibers

Influence of temperature on the photodegradation process using Ag-doped TiO2 nanostructures: Negative impact with the nanofibers

Co3O4, ZnO, Co3O4-ZnO Nanofibers and Their Properties

Electrospun NiO, ZnO and composite NiO–ZnO nanofibers/photocatalytic degradation of dairy effluent

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Co₃O₄, ZnO, Co₃O₄-ZnO Nanofibers and Their Properties