Polyaniline modified magnetic nanoparticles coated with dicationic ionic liquid for effective removal of rhodamine B (RB) from aqueous solution by Shahriman, Mohamad Shariff, Mohamad Zain, Nur Nadhirah, Mohamad, Sharifah, Abdul Manan, Ninie Suhana, Mohd Yaman, Suhaila, Asman, Saliza, Muggundha, Raoov