Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Light-driven nitrous oxide production via autotrophic denitrification by self-photosensitized Thiobacillus denitrificans
N2O (Nitrous oxide, a booster oxidant in rockets) has attracted increasing interest as a means of enhancing energy production, and it can be produced by nitrate (NO3−) reduction in NO3−-loading wastewater. However, conventional denitrification processes are often limited by the lack of bioavailable electron donors. In this study, we innovatively propose a self-photosensitized nonphototrophic Thiobacillus denitrificans (T. denitrificans-CdS) that is capable of NO3− reduction and N2O production driven by light. The system converted >72.1 ± 1.1% of the NO3−-N input to N2ON, and the ratio of N2O-N in gaseous products was >96.4 ± 0.4%. The relative transcript abundance of the genes encoding the denitrifying proteins in T. denitrificans-CdS after irradiation was significantly upregulated. The photoexcited electrons acted as the dominant electron sources for NO3− reduction by T. denitrificans-CdS. This study provides the first proof of concept for sustainable and low-cost autotrophic denitrification to generate N2O driven by light. The findings also have strong implications for sustainable environmental management because the sunlight-triggered denitrification reaction driven by nonphototrophic microorganisms may widely occur in nature, particularly in a semiconductive mineral-enriched aqueous environment. Keywords: Biohybrid system, Autotrophic denitrification, Semiconductors, Cadmium sulfide, Nitrous oxide
Light-driven nitrous oxide production via autotrophic denitrification by self-photosensitized Thiobacillus denitrificans
N2O (Nitrous oxide, a booster oxidant in rockets) has attracted increasing interest as a means of enhancing energy production, and it can be produced by nitrate (NO3−) reduction in NO3−-loading wastewater. However, conventional denitrification processes are often limited by the lack of bioavailable electron donors. In this study, we innovatively propose a self-photosensitized nonphototrophic Thiobacillus denitrificans (T. denitrificans-CdS) that is capable of NO3− reduction and N2O production driven by light. The system converted >72.1 ± 1.1% of the NO3−-N input to N2ON, and the ratio of N2O-N in gaseous products was >96.4 ± 0.4%. The relative transcript abundance of the genes encoding the denitrifying proteins in T. denitrificans-CdS after irradiation was significantly upregulated. The photoexcited electrons acted as the dominant electron sources for NO3− reduction by T. denitrificans-CdS. This study provides the first proof of concept for sustainable and low-cost autotrophic denitrification to generate N2O driven by light. The findings also have strong implications for sustainable environmental management because the sunlight-triggered denitrification reaction driven by nonphototrophic microorganisms may widely occur in nature, particularly in a semiconductive mineral-enriched aqueous environment. Keywords: Biohybrid system, Autotrophic denitrification, Semiconductors, Cadmium sulfide, Nitrous oxide
Light-driven nitrous oxide production via autotrophic denitrification by self-photosensitized Thiobacillus denitrificans
Man Chen (Autor:in) / Xiao-Fang Zhou (Autor:in) / Yu-Qing Yu (Autor:in) / Xing Liu (Autor:in) / Raymond Jian-Xiong Zeng (Autor:in) / Shun-Gui Zhou (Autor:in) / Zhen He (Autor:in)
2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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