Adsorption behavior of three-dimensional magnetic hollow porous Ni-ferrites microsphere for dyes removal

ABSTRACT

In this study, the three-dimensional magnetic hollow porous Ni-ferrites (3D-MHP-NiFe₂O₄) microsphere has been synthesized. As-prepared 3D-MHP-NiFe₂O₄ exhibits superior adsorption capacities for brilliant green (BG) (147.93 mg g⁻¹) and acid carmoisine (AC) (44.07 mg g⁻¹). Compared with NiFe₂O₄ nanoparticles (NiFe₂O₄-NPs), the enhancement has been ascribed to relatively high specific surface area and unique hollow porous structure, which are favorable for transfer of adsorbates. The Langmuir isotherm model conforms well to the experimental data. The adsorption process obeys the pseudo-second-order kinetic model. The overall rate process has been mainly controlled by intraparticle diffusion. In addition, 3D-MHP-NiFe₂O₄ exhibits a high stability and good reusability.

GRAPHICAL ABSTRACT

KEYWORDS:

• Acid carmoisine
• adsorption
• brilliant green
• Ni-ferrites