Notice of RetractionComparative Study of Ammonium, Nitrate and Nitrite Ions Adsorption onto Loose-Pore Geothermal Reservoir Medium

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The frequent exploitation of geothermal resources has induced the content of nitrogenous compounds increased in the geothermal water. Ammonium, nitrate and nitrite ions are commonly nitrogenous compounds present. In order to study their transport processes in loose-pore geothermal reservoir medium, the adsorption equilibrium studies of NH₄⁺, NO₃^- and NO₂^- ions from aqueous solutions onto loose-pore geothermal reservoir medium were carried out. The influence of initial studied ion concentration in solution and temperature were investigated. The results indicated that the adsorption of NO₃^- and NO₂^- onto loose-pore geothermal reservoir medium became weaken with the geothermal water temperature increasing and could be neglected at 60 °C. The equilibrium capacity of ammonium increases when initial ammonium concentration in solution increases from 5 to 200 mg/L at 20 and 60 °C. The ammonia adsorption data at 20 °C and 60 °C show good fit to the Freundlich adsorption isotherm, indicated by the regression coefficient (R²=0.977-0.981).