Photocatalytic hydrogen production over nanostructured mesoporous titania from olive mill wastewater

Badawy, Mohamed I.; Ghaly, Montaser Y.; Ali, Md. Eaqub

doi:10.1016/j.desal.2010.09.035

Cited by 59 publications

(29 citation statements)

References 25 publications

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“…An optimal catalyst concentration of ca. 2 g/L was also observed [219], beyond which turbidity induces light scattering and poor absorption [224].…”

Section: Waste Solutionsmentioning

confidence: 99%

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Hydrogen Production by Photoreforming of Renewable Substrates

Rossetti

2012

ISRN Chemical Engineering

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This paper focuses on the application of photocatalysis to hydrogen production from organic substrates. This process, usually called photoreforming, makes use of semiconductors to promote redox reactions, namely, the oxidation of organic molecules and the reduction of H + to H 2 . This may be an interesting and fully sustainable way to produce this interesting fuel, provided that materials efficiency becomes sufficient and solar light can be effectively harvested. After a first introduction to the key features of the photoreforming process, the attention will be directed to the needs for materials development correlated to the existing knowledge on reaction mechanisms. Examples are then given on the photoreforming of alcohols, the most studied topic, especially in the case of methanol and carbohydrates. Finally, some examples of more complex but more interesting substrates, such as waste solutions, are proposed.

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“…An optimal catalyst concentration of ca. 2 g/L was also observed [219], beyond which turbidity induces light scattering and poor absorption [224].…”

Section: Waste Solutionsmentioning

confidence: 99%

“…Different examples have been recently reported, such as the treatment of olive mill wastewater over titania, predominantly in the anatase phase, prepared by sol-gel [219].…”

Section: Waste Solutionsmentioning

confidence: 99%

Hydrogen Production by Photoreforming of Renewable Substrates

Rossetti

2012

ISRN Chemical Engineering

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“…However, since the rejection in the absence of the titania coating approached a saturation value near 98%, the effect of the coating was less than 1% and was dwarfed by the overall reduction. To obtain a more accurate value for the rejection due to photocatalytic activity, it would be necessary to perform Dissolved Oxygen (DO) and Chemical Oxygen Demand (COD) measurements (Badawy et al, 2011). These may be the subject of future work.…”

Section: Discussionmentioning

confidence: 99%

“…The filter would be fabricated from clay and coated with titania using simple and lowcost processes. The titania coating was intended to induce photocatalytic activity to degrade pollutants (Badawy et al, 2011;Isnaeni et al, 2011). Both simple mixing and sol-gel methods were investigated.…”

Section: Introductionmentioning

confidence: 99%

Permeability, Strength and Filtration Performance for Uncoated and Titania-Coated Clay Wastewater Filters

Ismet¹

2012

American Journal of Environmental Sciences

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Problem statement: Wastewater problems continue to be a relevant issue, particularly in urban areas. One promising low-cost material for manufacturing porous ceramics as water filter is clay. Clays can be blended with other materials such as polymers to obtain functional ceramic materials. Approach: Ceramic wastewater filters were fabricated from clay using both sol-gel and simple mixing methods followed by hot-pressing and calcination. Polyethylene Glycol (PEG) was used as a poreforming agent. Results: Varying the clay:PEG ratio modified the membrane permeability between 1.65×10 −16 m 2 and 3.16×10 −15 m 2 for the sol-gel membranes and between 1.38×10 −16 and 8.72×10−13 m 2 for membranes prepared by simple mixing. The strength ranged from 0.28 MPa-1.71 MPa for the sol-gel membranes and from 0.05-0.90 MPa for samples prepared by simple mixing. The filtration performance was tested using aqueous solutions of Methylene Blue (MB). The concentrations of MB remaining in the solution varied from 0.98-1.44% for sol-gel filters and from 1.50-38.05% for filters prepared by simple mixing. Conclusion: We succeeded in making ceramic as filter from clay. The porous ceramic can be used to reducing concentration of pollutant simulated. The model introduced has succeeded to explain the experimental observations with percolation approximation.

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“…Therefore, the technology for generating hydrogen by the photosplitting of water using a photocatalyst has attracted considerable research attention. The photocatalytic formation of hydrogen and oxygen on semiconductors such as TiO 2 [1][2][3][4][5] and MTiO 3 [6][7][8][9][10] has been studied extensively due to the low bandgap and high corrosion resistance of these semiconductor materials. However, the photocatalytic decomposition of water on a TiO 2 photocatalyst is ineffective because the amount of hydrogen produced is limited by the rapid recombination of holes and electrons, resulting in the formation of water.…”

Section: Introductionmentioning

confidence: 99%

High-Efficiently Photoelectrochemical Hydrogen Production over Zn-Incorporated Nanotubes

Lee

Yeo

et al. 2012

International Journal of Photoenergy

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To investigate the Zn dopant and nanotube morphology effects of TiO 2 in electrochemical hydrogen production from the photosplitting of methanol/water solution, we have designed a Zn-incorporated TiO 2 nanotube (Zn-TNT) photocatalyst. The TNT and Zn-TNT materials had a width of 70∼100 nm. The hydrogen production over the Zn-TNT photocatalysts was higher than that over the TNT; specifically, 10.2 mL of H 2 gas was produced after 9 hours when 0.5 g of 0.01 mol% Zn-TNT was used. The zeta-potential values in aqueous solution determined by electrophoretic light scattering (ELS) had negative surface charges, which was related to the surface stability, and the absolute value was the largest in 0.01 mol% Zn-TNT. On the basis of UV-visible and photoluminescence (PL) spectra results, the high photoactivity of Zn-TNT was attributed to the shift toward the visible region and increase of PL intensity due to the increased number of excited electrons and holes.

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Photocatalytic hydrogen production over nanostructured mesoporous titania from olive mill wastewater

Cited by 59 publications

References 25 publications

Hydrogen Production by Photoreforming of Renewable Substrates

Hydrogen Production by Photoreforming of Renewable Substrates

Permeability, Strength and Filtration Performance for Uncoated and Titania-Coated Clay Wastewater Filters

High-Efficiently Photoelectrochemical Hydrogen Production over Zn-Incorporated Nanotubes

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