Abstract

The phosphate removal from eutrophic lake has caused wide concern in the world, while effective process still lacking. A novel synthetic magnesium carbonate with spherical flower-like structure (MCSF) was prepared. Its performance for phosphorus adsorption from eutrophic lake by in-situ magnesium phosphate formation was tested and characterized. The effect of initial phosphorus concentration, adsorption time, adsorption dose, temperature, ionic strength and pH on the phosphorus adsorption by MCSF was investigated. Results showed that higher initial phosphorus concentration and longer adsorbing time could improve the adsorption capacity. The maximum sorption capacity was 143.27 mg/g under initial pH value 7.0. The Phosphate adsorption process was fitted with the Langmuir isotherm model and pseudo second-order model. Thermodynamic parameters values revealed that the sorption process at 298–318 K was spontaneous and endothermic. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) characterization of MCSF revealed that electrostatic attraction and chemical conversion were the major contributor for phosphate adsorption. MCSF release magnesium ions from its surface and rapidly combine with phosphate to form insoluble magnesium phosphate precipitate. The prepared MCSF has the potential to be used for the restoration of eutrophic lake by remove the phosphate with higher adsorption capacity.

HIGHLIGHTS

  • A novel synthetic magnesium carbonate with spherical flower-like structure (MCSF) for phosphorus adsorption from eutrophic lake by in-situ magnesium phosphate formation was prepared.

  • The maximum sorption capacity was 143.27 mg/g under initial pH value 7.0.

  • The Phosphate adsorption process was fitted with the Langmuir isotherm model and pseudo second-order model.

Graphical Abstract

Graphical Abstract
Graphical Abstract
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Author notes

1

These authors contribute equally

Supplementary data