Ammonium Sorption onto Polymeric Adsorbing Material from Corn Stalks Oxidized and Loaded with Magnesium

Le Liu, Meiting Ju, Ruite Lai, Shiqiu Zhang, Weizun Li


Corn stalks were modified by magnesium loading and an oxidation process and then characterized by a series of methods. The ammonium in wastewater showed high sorption efficiency onto the polymeric adsorbing material during the process, with a biochars dosage of 20 g/L for 8h. Mg2+ was the dominant cation exchanger on the modified corn stalk, and it played an important role in ammonium sorption. Large amounts of NH4+ were exchanged onto the corn stalk, and they formed strong complexes with oxygen-containing groups on the corn stalk surface through polar bonds, resulting in the removal of NH4+ from the solution. Na+ present in wastewater was the major influence on ammonium sorption onto the corn stalk.


Ammonium sorption; Polymeric adsorbing material; Modified corn stalk

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