Adsorption and desorption properties of iron and manganese colloids to inorganic phosphorus in groundwater
Recent studies have shown that phosphorus enrichment in groundwater has become one of the important pollution sources of water eutrophication.However,the process of phosphorus pollution in groundwater is not clear.The differences of adsorption-desorption characteristics among four common iron and manganese colloids(ferrihydrite colloids,goethite colloids,manganese dioxide colloids and birnessite colloids)toward inorganic phosphoruswere compared.The results showed that phosphorus adsorption onto iron and manganese colloids was dominated by a monolayer and chemical process.The adsorption capacities and rates of manganese colloids were greater than those of iron colloids.The conditions of neutral pH and high ionic strength were favorable for the adsorption of phosphorus by iron and manganese colloids,while the presence of organic matter greatly decreased phosphorus adsorption capacity,especially the highest suppression effect occurred onto goethite colloids,and humic acid presented a stronger suppression than fulvic acid.Moreover,the phosphorus desorption were effected more seriously by Ca2+ions than that by Na+ones,and the desorption rate by iron colloids was higher than that by manganese ones.Therefore,above results can provide the data support for phosphorus pollution process in groundwater.
iron and manganese colloidphosphorusadsorptiondesorptionunderground water
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