A tri-functionality magnetic nanoparticles (MNPs) are crucial for environmental remediation. This research focused on the synthesis of pH-catalytic-magnetic polymer beads for dye removal by using phase inversion technique. In 15 wt% of polyethersulfone (PES) polymer possessed the highest porosity (80%) was used in the synthesis of MNPs-PES beads. The methylene blue (MB) removal efficiency of MNPs-PES beads and PES beads was 72.94% and 62.67%, respectively. Similarly, the removal efficiency of methyl orange (MO) dye is higher for MNPs-PES beads (38.56%) compared to PES beads (34.16%). Besides, the removal efficiency for MB dye by MNPs-PES beads increased from 77.59% to 96.90% when solution pH increased from 3 to 9 while removal of MO dye increased from 61.14% to 74.35% when solution pH decreased from 9 to 3. Moreover, the removal efficiency for MB dye increased from 72.94% to 93.43% when H2O2 is added. Additionally, MNPs-PES beads were recollected successfully using external magnet. These indirectly proved that the MNPs-PES beads were responsive towards the tri-functionalities of pH-catalytic-magnetic. Lastly, the adsorption of MB dye onto MNPs-PES beads were fitted well to Langmuir isotherm model and pseudo-second-order model with both correlations R2 of more than 0.98.
