Direct in situ activation of Ag0 nanoparticles in synthesis of Ag/TiO2 and its photoactivity

Jaafar, Nur Farhana; Jalil, Aishah Abdul; Triwahyono, Sugeng; Efendi, Jon; Mukti, Rino R.; Jusoh, R.; Jusoh, Norela; Karim, Ainul Hakimah; Salleh, Nur Fatien Muhamad; Suendo, Veinardi

doi:10.1016/j.apsusc.2015.02.106

Cited by 89 publications

(32 citation statements)

References 61 publications

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“…It could be explained that the greater Ag content over TiO 2 /ZeY surface enhanced the growth of the crystallite size. So the crystallite size increased with higher Ag content [30]. In addition, both of Cu-loaded TiO 2 /ZeY and Ag-Cu-loaded TiO 2 /ZeY increased anatase crystal phase.…”

Section: Effect Of Ratio Of Sio 2 :Al 2 O 3 In Zeymentioning

confidence: 90%

Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

2020

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TiO2-based photocatalysts synthesized by the microwave-assisted sol-gel method was tested in the photocatalytic glucose conversion. Modifications of TiO2 with type-Y zeolite (ZeY) and metals (Ag, Cu, and Ag-Cu) were developed for increasing the dispersion of TiO2 nanoparticles and increasing the photocatalytic activity. Effects of the TiO2 dosage to zeolite ratio (i.e., TiO2/ZeY of 10, 20, 40, and 50 mol %) and the silica to alumina ratio in ZeY (i.e., SiO2:Al2O3 of 10, 100, and 500) were firstly studied. It was found that the specific surface area of TiO2/ZeY was 400–590 m2g−1, which was higher than that of pristine TiO2 (34.38 m2g−1). The good properties of 20%TiO2/ZeY photocatalyst, including smaller particles (13.27 nm) and high surface area, could achieve the highest photocatalytic glucose conversion (75%). Yields of gluconic acid, arabinose, xylitol, and formic acid obtained from 20%TiO2/ZeY were 9%, 26%, 4%, and 35%, respectively. For the effect of the silica to alumina ratio, the highest glucose conversion was obtained from SiO2:Al2O3 ratio of 100. Interestingly, it was found that the SiO2:Al2O3 ratio affected the selectivity of carboxylic products (gluconic acid and formic acid). At a low ratio of silica to alumina (SiO2:Al2O3 = 10), higher selectivity of the carboxylic products (gluconic acid = 29% and formic acid = 32%) was obtained (compared with other higher ratios). TiO2/ZeY was further loaded by metals using the microwave-assisted incipient wetness impregnation technique. The highest glucose conversion of 96.9 % was obtained from 1 wt. % Ag-TiO2 (40%)/ZeY. Furthermore, the bimetallic Ag-Cu-loaded TiO2/ZeY presented the highest xylitol yield of 12.93%.

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Section: Effect Of Ratio Of Sio 2 :Al 2 O 3 In Zeymentioning

confidence: 90%

Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

2020

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“…45,46 The TiO 2 -Ag-9 composite (Figure 3d) presented a new band at 90 cm -1 corresponding to the vibration mode of the Ag structure, moreover the band of TiO 2 at 137 cm -1 was shifted to 145 cm -1 due to the resonant Raman effect caused by deposition of Ag NPs on the TiO 2 . 47 The phonon confinement can cause these changes to the Raman vibration mode and peak intensities. 37 Spectra of the MWCNT/TiO 2 -Ag-9 and 10-Fe/MWCNT/TiO 2 -Ag-9 composites are shown in Figures 3e and 3f.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Synthesis, Characterization and Enhanced Photocatalytic Activity of Iron Oxide/Carbon Nanotube/Ag-doped TiO2 Nanocomposites

Neto¹,

Bellato²,

Souza³

et al. 2017

J. Braz. Chem. Soc.

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A novel magnetically recoverable catalyst (Fe/MWCNT/TiO 2 -Ag) was prepared in this study by a process that involves few steps. Titanium dioxide doped with silver and iron oxide was deposited on support of multi-walled carbon nanotubes (MWCNT). The synthesized catalysts were characterized by inductively coupled plasma mass spectrometry (ICP-MS), N 2 adsorption/desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), infrared spectroscopy (IR) and UV-Vis diffuse reflectance spectra (DRS). Phenol in aqueous solution (50 mg L -1 ) was used as a model compound for evaluation of UV-Vis (filter cut off for λ > 300 nm) photocatalytic activity. The composite catalyst has a high photocatalytic activity, destroying ca. 100% of phenol and removing 85% of total organic carbon in an aqueous solution after 180 min. The Fe/MWCNT/TiO 2 -Ag catalyst remained stable, presenting an 8% decrease in phenol degradation efficiency after ten consecutive photocatalytic cycles.

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“…From the graph, the values for the intercept of 1/kr and a slope of 1/krKLH, was determined. Due to the value of kr (78.125 mg.L -1 min -1 ) is larger than KLH (0.955 L.mg -1 ), it was suggested that the reaction occurs at the surface of the catalyst [41]. Hence, these results can be signified that the AgCN nanoparticles was capable in increasing the rate of reaction for efficient photodegradation of 2,4-D.…”

Section: Kinetic Studymentioning

confidence: 86%

Cymbopogon nardus Mediated Synthesis of Ag Nanoparticles for the Photocatalytic Degradation of 2,4-Dicholorophenoxyacetic Acid

Kamarudin

Setiabudi

Jusoh

et al. 2018

Bull. Chem. React. Eng. Catal.

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Advanced extraction method such as simultaneous ultrasonic-hydrodistillation (UAE-HD) extraction method has been proved to increased extraction yield of plant material yet the application of this method in the preparation of metal nanoparticles has not been studied. In this study, Cymbopogon nardus (C.N) extracted via UAE-HD extraction method was used to synthesis silver (Ag) nanoparticles. XRD and TEM analysis confirms the formation of spherical shape Ag nanoparticles with size ranging between 10-50 nm. FTIR spectra suggest the presence of bioactive compounds in the C.N leaves extract that may responsible to the stabilization and reduction of Ag ions (Ag + ) to metallic Ag nanoparticles (Ag 0 ). The TPC analysis successfully proved that huge number of phenolic compound greatly involved in the nanoparticles synthesis process. Next, the catalytic activity of the synthesized Ag nanoparticles was tested towards the degradation of 2,4-Dicholorophenoxyacetic acid herbicide with remarkable degradation performance up to 98%. Kinetic study confirms that surface reaction was the controlling step of the catalytic process.

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Direct in situ activation of Ag0 nanoparticles in synthesis of Ag/TiO2 and its photoactivity

Cited by 89 publications

References 61 publications

Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

Enhancement of Photocatalytic Oxidation of Glucose to Value-Added Chemicals on TiO2 Photocatalysts by A Zeolite (Type Y) Support and Metal Loading

Synthesis, Characterization and Enhanced Photocatalytic Activity of Iron Oxide/Carbon Nanotube/Ag-doped TiO2 Nanocomposites

Cymbopogon nardus Mediated Synthesis of Ag Nanoparticles for the Photocatalytic Degradation of 2,4-Dicholorophenoxyacetic Acid

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