Figure 6

The adsorption amount of each asphaltene (a) As-1, (b) As-2, (c) As-3, (d) As-4, (e) As-5 onto the magnetite, hematite, calcite, and dolomite NPs at initial concentration of 1000 ppm.

The adsorption amount of each asphaltene (a) As-1, (b) As-2, (c) As-3, (d) As-4, (e) As-5 onto the magnetite, hematite, calcite, and dolomite NPs at initial concentration of 1000 ppm.