Removal of Arsenic(III) and Arsenic(V) anions from Aqueous solution using engineered Mn3O4 Nanomaterials. Abstract

Nanophase Mn₃O₄ particles were synthesized through a titration/precipitation method and utilized for the removal of Arsenic(III) and Arsenic(V) ions from aqueous solution as a possible method for drinking water treatment Batch studies were performed to measure the effects of  reaction time, pH, and concentration and interfering ions on the removal of both As(III) and As(V) from aqueous solutions. The synthesized nano MnFe₂O₄ was characterized using powder X-ray diffraction analysis for both size and phase.  Batch pH experiments were performed to determine the optimum pH for the binding using 300 ppb of either As(III) or As(V) and 10mg of Mn₃O₄ particles with a 1hr contact time.  The binding was observed to be pH dependent from pH 2 thru pH 6 and  Using the optimal binding pH 4, further batch Isotherm studies were performed with 1hr and 24hr contact times, using Mn₃O₄particles with reaction concentrations of 2, 20, 50, 100, 200 ppm to determine the binding capacity of both As(III) and As(V) to the nanomaterial.  The isotherms were plotted and the Langmuir equation was used to calculate for capacity (mg/g), of As(III) and As(V) of the nanomaterial.