Adsorption of polyethyleneimine (PEI) on hematite. Influence of magnetic field on adsorption of PEI on hematite

• We studied an influence of magnetic field on adsorption of PEI on hematite.
• A mechanism of adsorption of PEI on hematite is proposed as well as its changes under the influence of magnetic field.
• A multilayer character of adsorption of PEI on hematite in geomagnetic field is revealed.
• A complex statistical analysis of obtained results is presented.

A research on influence of magnetic field of various inductions on adsorption of polyethyleneimine (PEI) onto hematite is presented. Properties of the adsorbent surface (Magnetic Force Microscopy images and nitrogen adsorption data) and its behaviour in a water solution (particle size distribution) are also studied. Moreover, new analytical approach is proposed to compare the shape of the isotherms (e.g. presence of plateaus) by calculating a reciprocal derivative.A proposal of adsorption mechanism that explains a multilayer character of the adsorption itself as well as shapes of adsorption isotherms is presented. Changes in the before-mentioned mechanism due to exposure to magnetic field are also explained. Study revealed that in most cases presence of magnetic field decreases an amount of PEI adsorbed and this decrease is not a linear function of magnetic field strength – the tendency is reversed for the strongest field investigated (what is consistent with literature data).

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