Antioxidant CeO doped with carbon dots enhance ammonia production by an electroactive Azospirillum humicireducens SgZ-5.

Microbial nitrogen fixation is a fundamental process in the nitrogen cycle, providing a continuous supply of biologically available nitrogen essential for life. In this study, we combined cerium oxide-doped carbon dots (CeO/CDs) with electroactive nitrogen-fixing bacterium Azospirillum humicireducens SgZ-5 to enhance nitrogen fixation through ammonium production. Our research demonstrates that treatment of SgZ-5 cells with CeO/CDs (0.

[Assessment of Soil Fluorine Pollution in Jinhua Fluorite Ore Areas].

The contents of. soil total fluorine (TF) and water-soluble fluorine (WF) were measured in fluorite ore areas located in Jinhua City. The single factor index, geoaccumulation index and health risk assessment were used to evaluate fluorine pollution in soil in four fluorite ore areas and one non-ore area, respectively.

Hg(0) absorption in potassium persulfate solution.

The aqueous phase oxidation of gaseous elemental mercury (Hg(0)) by potassium persulfate (KPS) catalyzed by Ag(+) was investigated using a glass bubble column reactor. Concentration of gaseous mercury and potassium persulfate were measured by cold vapor atom absorption (CVAA) and ion chromatograph (IC), respectively. The effects of pH value, concentration of potassium persulfate and silver nitrate (SN), temperature, Hg(0) concentration in the reactor inlet and tertiary butanol (TBA), free radical scavenger, on the removal efficiency of Hg(0) were studied.