Abstract
BackgroundTo solve the problem of eutrophication caused by phosphate, a metal-loaded biocarbon composite material is considered to be an effective adsorbent for removing phosphate. MethodsIn this study, potassium humate was used to prepare modified potassium humate-based carbon material (MPHCM) through magnesium chloride modification and rapid pyrolysis. Significant findingsStudies have shown that MPHCM can effectively remove phosphate from water. At 318 K and with pH=3, the maximum adsorption capacity reached 181.96 mg P g−1, and the adsorption process conformed to the pseudo-first and pseudo-secondary adsorption kinetic models and the Langmuir adsorption model. This adsorption process involved physical and chemical adsorption, which indicated monolayer adsorption. The main adsorption mechanisms for MPHCM were protonation, electrostatic interactions, ligand exchange and inner sphere complex precipitation. Six desorption cycles verified the excellent reproducibility of MPHCM for phosphate removal. Therefore, this study provides a new adsorbent for phosphate removal and expands the application range of potassium humate-based carbon materials.
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