Unravelling the pH-dependence of a molecular photocatalytic system for hydrogen production

We describe a hybrid photocatalytic system for hydrogen production consisting of nanocrystalline CdSe/CdS dot-in-rod (DIR) structures coupled to [NiFe] soluble hydrogenase I (SHI) fromPyrococcus furiosus.

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Sunlight-driven photocatalytic hydrogen production from water using metal-doped strontium titanate perovskite

10.26434/chemrxiv.11466129.v2 ◽

2020 ◽

Author(s):

Pushkal Sharma ◽

Cheng-Ting Lee ◽

Jeffrey Chi-Sheng Wu

Keyword(s):

Hydrogen Production ◽

Water Splitting ◽

Strontium Titanate ◽

Experimental Studies ◽

Light Response ◽

Theoretical Studies ◽

Photocatalytic Water Splitting ◽

Visible Light Response ◽

Sacrificial Agent ◽

Metal Doped

<div>The effects of various metal dopants on the photocatalytic water splitting activity of SrTiO<sub>3</sub> -based photocatalysts were investigated using experimental studies. The SrTiO<sub>3</sub>:Rh (1%) has been found to give the best efficiency in water splitting out of the various metal-doped samples studied. However, the same host doped with other metal dopants such as Fe, V, Ga, and Sb leads to negligible hydrogen evolution even when at least Fe has a better visible light response. Our results accompanied by previously conducted theoretical studies by our group explain the high photocatalytic water splitting activity of Rh doped SrTiO<sub>3 </sub>. Furthermore, the effects of the amount of catalyst, the proportion of sacrificial agent and pH were studied for the SrTiO<sub>3</sub>:Rh (1 mol%) along with studying its activity with seawater.</div>

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pH Dependence on Biosorption of Pb (II) by P. amaryllifolius Roxb

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.625.757 ◽

2014 ◽

Vol 625 ◽

pp. 757-760

Author(s):

Mohd Zamri Abdullah ◽

Suriati Sufian ◽

Farah Hanim Abdul Hamid

Keyword(s):

Heavy Metal ◽

Wastewater Treatment ◽

Langmuir Isotherm ◽

Ph Dependence ◽

Important Criterion ◽

Sorption Activity ◽

Solution Ph ◽

Living Biomass ◽

Optimum Ph ◽

Alkaline Conditions

Solution pH plays an important criterion in the biosorption system in ensuring optimum uptake of heavy metal by a biomass is achieved at the highest performance. In this study, the biosorption of lead (II) ions by the non-living biomass of P. Amaryllifolius Roxb is performed at various pH from acidic to alkaline conditions. Results show that the optimum pH for the removal of lead (II) ions from wastewater occurs at pH 5, whereby the sorption activity occurs through monolayer process as it follows the Langmuir isotherm. High removal percentage of the metal ions at various concentrations further emphasize on the viability of P. amaryllifolius Roxbto be utilized as a green resources in the wastewater treatment.

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A Novel Photocatalytic System Constructed Using Eosin Y, Titanium Dioxide, and Keggin-Type Platinum(II)- and Aluminum(III)-Coordinated Polyoxotungstates for Hydrogen Production from Water Under Visible Light Irradiation

Catalysis Letters ◽

10.1007/s10562-015-1574-8 ◽

2015 ◽

Vol 145 (9) ◽

pp. 1703-1709 ◽

Cited By ~ 5

Author(s):

Shota Hattori ◽

Yuki Ihara ◽

Chika Nozaki Kato

Keyword(s):

Titanium Dioxide ◽

Hydrogen Production ◽

Visible Light ◽

Visible Light Irradiation ◽

Light Irradiation ◽

Eosin Y ◽

Keggin Type ◽

Photocatalytic System

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A Highly Efficient Photocatalytic System for Hydrogen Production by a Robust Hydrogenase Mimic in an Aqueous Solution

Angewandte Chemie ◽

10.1002/ange.201006352 ◽

2011 ◽

Vol 123 (14) ◽

pp. 3251-3255 ◽

Cited By ~ 62

Author(s):

Feng Wang ◽

Wen-Guang Wang ◽

Xiao-Jun Wang ◽

Hong-Yan Wang ◽

Chen-Ho Tung ◽

...

Keyword(s):

Aqueous Solution ◽

Hydrogen Production ◽

Highly Efficient ◽

Photocatalytic System

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Photoelectrocatalytic Hydrogen Production Using a TiO2/WO3 Bilayer Photocatalyst in the Presence of Ethanol as a Fuel

Catalysts ◽

10.3390/catal9120976 ◽

2019 ◽

Vol 9 (12) ◽

pp. 976 ◽

Cited By ~ 6

Author(s):

Panagiotis Marios Adamopoulos ◽

Ioannis Papagiannis ◽

Dimitrios Raptis ◽

Panagiotis Lianos

Keyword(s):

Hydrogen Production ◽

Surface Recombination ◽

Photoelectrochemical Cell ◽

Photon Absorption ◽

Bilayer Film ◽

Carbon Paper ◽

Faradaic Efficiency ◽

Charge Densities ◽

Titania Layer ◽

Sacrificial Agent

Photoelectrocatalytic hydrogen production was studied by using a photoelectrochemical cell where the photoanode was made by depositing on FTO electrodes either a nanoparticulate WO3 film alone or a bilayer film made of nanoparticulate WO3 at the bottom covered with a nanoparticulate TiO2 film on the top. Both the electric current and the hydrogen produced by the photoelectrocatalysis cell substantially increased by adding the top titania layer. The presence of this layer did not affect the current-voltage characteristics of the cell (besides the increase of the current density). This was an indication that the flow of electrons in the combined semiconductor photoanode was through the WO3 layer. The increase of the current was mainly attributed to the passivation of the surface recombination sites on WO3 contributing to the limitation of charge recombination mechanisms. In addition, the top titania layer may have contributed to photon absorption by back scattering of light and thus by enhancement of light absorption by WO3. Relatively high charge densities were recorded, owing both to the improvement of the photoanode by the combined photocatalyst and to the presence of ethanol as the sacrificial agent (fuel), which affected the recorded current by “current doubling” phenomena. Hydrogen was produced under electric bias using a simple cathode electrode made of carbon paper carrying carbon black as the electrocatalyst. This electrode gave a Faradaic efficiency of 58% for hydrogen production.

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