Photoelectrochemical conversion of hydrogen sulfide to hydrogen using artificial light and solar radiation

Grzyll, Lawrence R.; Thomas, John J.; Barile, Ronald G.

doi:10.1016/0360-3199(89)90040-2

Cited by 25 publications

(7 citation statements)

References 2 publications

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“…Beyond this optimum sulfide ion concentration, the photocatalytic H 2 generation decreased. The H 2 generation was reduced due to the increase in concentration of polysulfide ions which absorb a part of the visible light (400 nm) .…”

Section: Resultssupporting

confidence: 90%

“…The H 2 generation stopped at 90 min. Similar findings were reported for various catalytic systems .…”

Section: Resultsmentioning

confidence: 99%

“…Apparently, photogenerated hydrogen ions interacted with hydroxide ions producing water and thus, the hydrogen generation rate declined. The effect of pH on H 2 generation was also studied for different catalytic systems by various researchers .…”

Section: Resultsmentioning

confidence: 99%

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Concurrent Hydrogen Production and Hydrogen Sulfide Decomposition by Solar Photocatalysis

Priya

Kanmani

2016

CLEAN Soil Air Water

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Core-shell (CdS-ZnS)/TiO 2 nanoparticles (TiO 2 -core, CdS-ZnS À shell) were synthesized and their photocatalytic activity for hydrogen generation was compared with CdS, ZnS, and CdS-ZnS nanoparticles and TiO 2 nanorods. Physical characterization of the catalysts was carried out for particle size, molecular vibrations, band gap energy, specific surface area, and binding energy. Based on the results, core-shell formation between CdS-ZnS and TiO 2 was established. The CdS-ZnS/TiO 2 core-shell NPs exhibited high rates of hydrogen generation (29 mL/h) from water containing sulfide and sulfite ions. Photocatalytic generation of hydrogen with CdS-ZnS/TiO 2 core-shell nanoparticles was investigated by optimizing various operating variables as, e.g., the sulfide ion concentration, sulfite ion concentration, pH, catalyst concentration, light intensity and recycle flow rates in a 1 L laboratory scale tubular photoreactor. The maximum kinetic constant of 0.0038 min À1 was found at 0.05 M sulfide ion, 0.2 M sulfite ion, pH 11.3, and 500 mg/L photocatalyst. A final conversion of 30% was achieved under optimized conditions. This is a cleaner production method for generating H 2 and also an environmentally benign process.

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Section: Resultssupporting

confidence: 90%

“…The H 2 generation stopped at 90 min. Similar findings were reported for various catalytic systems .…”

Section: Resultsmentioning

confidence: 99%

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Concurrent Hydrogen Production and Hydrogen Sulfide Decomposition by Solar Photocatalysis

Priya

Kanmani

2016

CLEAN Soil Air Water

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“…The photocatalytic H 2 S cleavage is reported to proceed in water or alkaline solution [79,81,132,133]. The most used photocatalyst for this reaction is CdS (either by itself or as a mixture with other semiconductors).…”

Section: H 2 S Splittingmentioning

confidence: 99%

Solar Photocatalytic Hydrogen Production: Current Status and Future Challenges

Schneider

Kandiel

Bahnemann

2014

Materials and Processes for Solar Fuel Production

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Due to the increase of the worldwide demand for energy along with the global warming and the increasing level of atmospheric CO 2 , solar hydrogen has been proposed as an optimal fuel as it can be produced from water using solar energy which emerges as the most promising energy source in terms of abundance and sustainability. So far, the main commercial process for producing molecular hydrogen is steam reforming of hydrocarbons which is, however, connected with a CO 2 emission disadvantage. Carbon-free hydrogen production can be achieved by water splitting employing an electrolyzer powered by photovoltaics, but a potentially more cost-effective route is to perform direct photocatalytic water splitting using semiconductor photocatalysts. Herein, the authors present the principles of this process, the maximum solar-to-hydrogen conversion efficiency, the most active photocatalysts reported so far and the challenges for the development of the optimum photocatalyst for the efficient release of hydrogen from water. Since the efficiency of the overall photocatalytic water splitting is still very low and the photocatalytic reforming of biomass compounds can be considered as an intermediate step between the current fossil fuel consumption and the dream for an efficient direct photocatalytic water splitting utilizing solar energy, the photocatalytic hydrogen production employing different so-called sacrificial reagents, i.e., electron donors, is also presented and discussed herein. Commonly, the system employing TiO 2 as the photocatalyst and methanol as the sacrificial reagent is investigated, thus, details concerning the possibility of enhancing the photocatalytic activity of this system as well as the current knowledge of the underlying mechanism are presented at the end of this chapter.

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“…In addition, CdS loaded with RuO 2 (0.25 wt%) is also evaluated for its potential for commercial application. When the CdS-RuO 2 concentration is 2.0 mg mL -1 in 500 mL solution of 0.1 M Na 2 S and 0.1 M Na 2 SO 3 (with a surface area of 112 cm 2 ), a hydrogen generation rate of 28 mL h -1 could be achieved under solar light irradiation [35]. Adapted with permission from reference [10].…”

Section: H 2 S Decomposition Through S 2-/so 3 2-solutionmentioning

confidence: 99%

Photochemical Decomposition of Hydrogen Sulfide

Yu¹,

Zhou²

2016

Advanced Catalytic Materials - Photocatalysis and Other Current Trends

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Hydroμen sulλide is an extremely toxic μas which is μenerated λrom both nature λactors and human λactors. " proper method λor the eλλicient decomposition oλ hydroμen is oλ μreat importance. Usinμ traditional Claus process, hydroμen sulλide could be decomposed into hydroμen oxide and sulλur. One drawback oλ this process is that the enerμy stored in hydroμen sulλide is partially wasted by the λormation oλ hydroμen oxide. In λact, the enerμy could be utilized λor the μeneration oλ hydroμen, a potential enerμy source in λuture, or other chemical products. Various methods that could possibly make better use oλ hydroμen sulλide have been studied in recent years, like thermal decomposition, plasma method, electrochemical method, and photochemical method. In particular, there have been hiμh hopes in photochemical method due to the possible direct solar enerμy conversion into chemical enerμy. Unlike traditional photocatalytic water splittinμ, hydroμen sulλide decomposition is more accessible λrom the thermodynamic point oλ view. Photocatalytic hydroμen sulλide decomposition could occur in both μas phase and solution phase and various systems have been reported. "esides, the photoelectrochemical decomposition oλ hydroμen sulλide is also hiμhliμhted. In this chapter, we will simply introduce the current situation λor photochemical decomposition oλ hydroμen sulλide.

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Photoelectrochemical conversion of hydrogen sulfide to hydrogen using artificial light and solar radiation

Cited by 25 publications

References 2 publications

Concurrent Hydrogen Production and Hydrogen Sulfide Decomposition by Solar Photocatalysis

Concurrent Hydrogen Production and Hydrogen Sulfide Decomposition by Solar Photocatalysis

Solar Photocatalytic Hydrogen Production: Current Status and Future Challenges

Photochemical Decomposition of Hydrogen Sulfide

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