Enhanced photocatalytic activity of Pt deposited on titania nanotube arrays for the hydrogen production with glycerol as a sacrificial agent

Slamet, Slamet; Ratnawati, .; Gunlazuardi, Jarnuzi; Dewi, Eniya Listiani

doi:10.1016/j.ijhydene.2017.07.208

Cited by 35 publications

(28 citation statements)

References 46 publications

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“…Also, in irradiation of Pt/TiO 2 in the absence and in the presence of glycerol, they detected H 2 O 2 which was produced by dimerization of hydroxyl radicals [32]. Also, Ratnawati et al detected a small amount of 1,2-ethanediol and acetic acid in reaction mixture [33]. They elucidated that Pt catalyzed not only reduction of water to H 2 but also dehydration of 1a.…”

Section: Degradation Mechanism Of 1a and 1bmentioning

confidence: 99%

Glycerol as a Superior Electron Source in Sacrificial H₂ Production over TiO₂ Photocatalyst

Yasuda¹,

Matsumoto²,

Yamashita³

2019

Glycerine Production and Transformation - An Innovative Platform for Sustainable Biorefinery and Energy

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Biodiesel fuel (BDF) has gained much attention as a new sustainable energy alternative to petroleum-based fuels. BDF is produced by transesterification of vegetable oil or animal fats with methanol along with the co-production of glycerol. Indeed, transesterification of vegetable oil (136.5 g) with methanol (23.8 g) was performed under heating at 61°C for 2 h in the presence of NaOH (0.485 g) to produce methyl alkanoate (BDF) and glycerol in 83.7 and 73.3% yields, respectively. Although BDF was easily isolated by phase separation from the reaction mixture, glycerol and unreacted methanol remained as waste. In order to construct a clean BDF synthesis, the aqueous solution of glycerol and methanol was subjected to sacrificial H 2 production over a Pt-loaded TiO 2 catalyst under UV irradiation by high-pressure mercury lamp. H 2 was produced in high yield. The combustion energy (ΔH) of the evolved H 2 reached 100.7% of the total ΔH of glycerol and methanol. Thus, sacrificial agents such as glycerol and methanol with all of the carbon attached to oxygen atoms can continue to serve as an electron source until their sacrificial ability was exhausted. Sacrificial H 2 production will provide a promising approach in the utilization of by-products derived from BDF synthesis.

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Section: Degradation Mechanism Of 1a and 1bmentioning

confidence: 99%

Glycerol as a Superior Electron Source in Sacrificial H₂ Production over TiO₂ Photocatalyst

Yasuda¹,

Matsumoto²,

Yamashita³

2019

Glycerine Production and Transformation - An Innovative Platform for Sustainable Biorefinery and Energy

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“…Some authors have suggested that the reduction of the photogenerated holes may happen when they are transferred directly toward the methanol or by intermediary species such as hydroxyl radicals (•OH) or oxide ions (O 2-), formed from the oxidation of water molecules or by reduction of remaining oxygen molecules (O2) (even after deaeration) that are adsorbed on the photocatalytic surface, or both simultaneously [34]. Other authors proposed that the dissociation of the organic compounds can be complete arriving to CO2 and H2O, or partial, where the reaction proceeds into the dissociation of next intermediary products [38,39]. Patsoura et al [16] explained also that the addition of organic compounds in photocatalytic reactions helps to clean up the catalyst surface from "poisons", which results into a higher hydrogen evolution.…”

Section: Effect Of the Methanol Concentrationmentioning

confidence: 99%

“…However, when the Pd added to the photodeposition solution increased to 0.0297 wt %, a decrease was observed in the hydrogen production (0.519 ml/min.gCat). Some author explain that the high metal content on catalytic supports could create a shadow effect, therefore the light absorption decrease [38][9]. Table 2 shows a comparison of quantum yield values (%) for hydrogen production obtained by several catalysts based, most of them, on TiO2.…”

Section: Effect Of Amount Of Pd Photodepositedmentioning

confidence: 99%

Pd/TiO2-WO3 photocatalysts for hydrogen generation from water-methanol mixtures

Camacho

Rey

Hernández‐Alonso

et al. 2018

Applied Surface Science

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Solar light is inexhaustible; therefore, to take advantage of this energy, it is necessary to develop materials capable of absorbing in the widest range of the solar spectra. Although TiO2 is one of the most studied photocatalysts, it just absorbs in the UV range.With the purpose of increasing this absorption light towards visible range, different materials such as Pd and WO3 have been supported on bare TiO2, to study their photocatalytic properties for hydrogen generation from water-methanol mixtures under UVA and solar irradiation. Several parameters on the hydrogen production such as the amount of Pd, the catalyst amount and the influence of the water matrix have been studied. These catalytic materials were characterized by means of inductively coupled plasma with an optical emission spectrophotometer, nitrogen adsorption-desorption isotherms, X-ray diffraction, high resolutiontransmission electron microscopy, X-ray photoelectron spectroscopy and diffuse reflectance UV-Vis spectroscopy. Hydrogen evolution was monitored by on-line gas chromatography. The incorporation of a small amount of Pd (lower than 0.01 wt %) produced an important increase in the hydrogen production. Furthermore, the addition of WO3 on the bare titania also produced an increase in the hydrogen generation. The highest quantum efficiency obtained in this work under solar radiation was 7.7 % by the catalyst based on palladium supported on the nanotubes of titanium dioxide and tungsten trioxide (Pd/NT-WO3) using an aqueous solution of methanol (50 vol.%). PresentAddress: Repsol Technology Center, Agustín de Betancourt, s/n, 28935 Móstoles, Madrid, Spain Abbreviations: NT, nanotubes of TiO2; P25, commercial TiO2; Eg, Energy gapKeywords: photocatalysis; hydrogen; low palladium addition; sacrificial agents, quantum efficiency Graphical abstract Highlights: An efficient catalyst for hydrogen production under solar radiation has been obtained by doping Pd nanoparticles by photodeposition over a powdered support containing TiO2 and WO3. The addition of small Pd particles by photodeposition produces a strong increase in the hydrogen production decreasing the recombination of the electron hole pairs. The addition of WO3 nanoparticles allows the absorption of light of the catalysts in the visible region.

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“…TiO 2 is one of the semiconductors photocatalyst that promise with its outstanding performance in environment application [5]. It is widely used since its properties such as cheap, non-toxicity, high oxidation ability and chemical stability [3,6]. However, TiO 2 still has drawback in its applications since it has wide band gap that can only active in UV light region and high recombination rate of electron-hole pairs [7].…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the drawback, many efforts have been done to sensitize titania with other semiconductors that have narrower band gap, for instance CdSe and CdS for improving the visible-light response [7,8] and to load metal such as Ni, Au, Pd and Pt, to diminish the rapid recombination of electron hole pairs that results from photocatalytic process [6,7]. Pt with the largest work function among noble metal, is one of the excellent electrons trapper [6], and therefore the abundance of holes available can undergo oxidation reaction that greatly enhances the photocatalytic performance. Synthesizing CdS/(Pt-TiO 2 ) would give synergy effect that enhance photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance of CdS/(Pt-TiO2)-Pumice for E. Coli Disinfection in Drinking Water

2020

IJITEE

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Abstract: Photocatalytic removal of E. coli pathogen bacteria existing in drinking water was studied in this paper. CdS/(Pt-TiO2) nanocomposite was produced by depositing Pt/CdS on TiO2 nanoparticles with chemical reduction and hydrothermal method. On the other hand, CdS/(Pt-TiO2)-Pumice was fabricated by immobilizing of titania composite onto pumice with dip coating method to become photocatalysis without causing problem in the separation titania from solution. The Field Emission Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS) were utilized to characterize the photocatalyst samples. Based on the morphology characterization, it was observed that successful deposition of Pt and CdS on TiO2 occurred. Furthermore, decorating Pt/CdS on TiO2 can reduce bandgap energy compare to the bare TiO2 according to the UV-Vis DRS analysis. The treatment of E. coli inactivation with CdS/(Pt-TiO2), CdS/(Pt-TiO2)-pumice and without photocatalyst had performed in the photoreactor that irradiated with mostly visible light in 90 min. The amount of photocatalyst and the contact mechanism between the photocatalyst and bacteria in the water would effects the performance of E-coli photocatalytic disinfection in drinking water.

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Enhanced photocatalytic activity of Pt deposited on titania nanotube arrays for the hydrogen production with glycerol as a sacrificial agent

Cited by 35 publications

References 46 publications

Glycerol as a Superior Electron Source in Sacrificial H₂ Production over TiO₂ Photocatalyst

Glycerol as a Superior Electron Source in Sacrificial H₂ Production over TiO₂ Photocatalyst

Pd/TiO2-WO3 photocatalysts for hydrogen generation from water-methanol mixtures

Photocatalytic Performance of CdS/(Pt-TiO2)-Pumice for E. Coli Disinfection in Drinking Water

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Enhanced photocatalytic activity of Pt deposited on titania nanotube arrays for the hydrogen production with glycerol as a sacrificial agent

Cited by 35 publications

References 46 publications

Glycerol as a Superior Electron Source in Sacrificial H2 Production over TiO2 Photocatalyst

Glycerol as a Superior Electron Source in Sacrificial H2 Production over TiO2 Photocatalyst

Pd/TiO2-WO3 photocatalysts for hydrogen generation from water-methanol mixtures

Photocatalytic Performance of CdS/(Pt-TiO2)-Pumice for E. Coli Disinfection in Drinking Water

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Glycerol as a Superior Electron Source in Sacrificial H₂ Production over TiO₂ Photocatalyst

Glycerol as a Superior Electron Source in Sacrificial H₂ Production over TiO₂ Photocatalyst