Microalgae are photosynthetic microorganisms that convert solar energy into chemical energy, which can be redirected physiologically to produce hydrogen (H2). Photosynthetic H2 production by microalgae has many advantages, such as CO2 sequestration; bioremediation of wastewater when it is used as culture medium to grow algal biomass; microalgae growth is not seasonal; cultures can be installed in nonarable lands; and depending on the microalgae species, valuable byprod- ucts can be obtained [1].
H2 production by microalgae is classified into 2 categories: direct photolysis, when H2 is produced from electrons that arise from the water-splitting process of photosynthesis, and indirect photolysis, when H2 is produced from electrons that are derived from the carbohydrate catabolism [2]. In both processes, [Fe]-hydrogenase reduces the electrons to molec- ular H2 gas. However, hydrogenase expression and its activity are suppressed by oxygen (O2) that is produced by photosyn- thesis [3]. Thus, during direct photolysis, in addition to generating H2, microalgae produce O2 which in turn inhibits [Fe]-hydrogenase and thus, H2 production.
Microalgae are photosynthetic microorganisms that convert solar energy into chemical energy, which can be redirected physiologically to produce hydrogen (H2). Photosynthetic H2 production by microalgae has many advantages, such as CO2 sequestration; bioremediation of wastewater when it is used as culture medium to grow algal biomass; microalgae growth is not seasonal; cultures can be installed in nonarable lands; and depending on the microalgae species, valuable byprod- ucts can be obtained [1].H2 production by microalgae is classified into 2 categories: direct photolysis, when H2 is produced from electrons that arise from the water-splitting process of photosynthesis, and indirect photolysis, when H2 is produced from electrons that are derived from the carbohydrate catabolism [2]. In both processes, [Fe]-hydrogenase reduces the electrons to molec- ular H2 gas. However, hydrogenase expression and its activity are suppressed by oxygen (O2) that is produced by photosyn- thesis [3]. Thus, during direct photolysis, in addition to generating H2, microalgae produce O2 which in turn inhibits [Fe]-hydrogenase and thus, H2 production.
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