Hydrogen peroxide photoproduction by immobilized cells of the blue-green alga Anabaena variabilis: A way to solar energy conversion
A photosystem for hydrogen peroxide photoproduction formed by immobilized cells of the blue-green alga, Anabaena variabilis and the redox mediator methyl viologen is described. Hydrogen peroxide is produced in a redox catalyst cycle in which methyl viologen is reduced by electrons from water obtained by the photosynthetic apparatus of the algae using solar energy, and reoxidized by the introduction of oxygen into the solution. Hydrogen peroxide is produced during methyl viologen re-oxidation in two steps by means of the formation of superoxide. Experimental conditions for maximum photoproduction (catalyst charge, chlorophyll, and agar final concentration for cell immobilization) have been investigated using a continuous photosystem with immobilized A. variabilis as photocatalyst. Under the determined optimum conditions, the photosystem with immobilized A. variabilis is photocatalyst. Under the determined optimum conditions, the photosystem produces hydrogen peroxide at a rate of 100 {mu}moles/mg Chl{center dot}h, maintaining the production for several hours, and with an energy conversion efficiency of about 2%. Taking into account the use of hydrogen peroxide as fuel, this photosystem can be a useful tool in the storage of solar energy.
- OSTI ID:
- 7117364
- Journal Information:
- Solar Energy (Journal of Solar Energy Science and Engineering); (United States), Vol. 49:1; ISSN 0038-092X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
25 ENERGY STORAGE
ENERGY STORAGE SYSTEMS
DESIGN
HYDROGEN PEROXIDE
BIOSYNTHESIS
AGAR
ALGAE
BIPYRIDINES
CATALYSIS
CHLOROPHYLL
OXIDATION
PHOTOCHEMICAL ENERGY STORAGE
PHOTOSYNTHESIS
REDOX PROCESS
SOLAR ENERGY
AZINES
CARBOHYDRATES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COLLOIDS
DISPERSIONS
ENERGY
ENERGY SOURCES
ENERGY STORAGE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PEROXIDES
PHOTOCHEMICAL REACTIONS
PHYTOCHROMES
PIGMENTS
PLANTS
POLYSACCHARIDES
PORPHYRINS
PROTEINS
PYRIDINES
RENEWABLE ENERGY SOURCES
REPROCESSING
SACCHARIDES
SEPARATION PROCESSES
STORAGE
SYNTHESIS
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
250800 - Energy Storage- Chemical