Abstract
Magnetic hydroxyapatite entrapped agarose composite beads (M-HAP/Agar composite beads) have been successfully synthesized by emulsification of magnetic HAP nanoparticles with agarose suspension. In the process, the magnetic HAP nanoparticles served as the main resource for high adsorption performance, which were constructed by surface modification of Fe3O4 with N-(phosphonomethyl)iminodiacetic acid (PM-IDA) and followed by coating with HAP. This strategy integrates the distinct advantages of large-size beads and magnetic response for easy recovery as well as nanoparticles for high adsorption capacity. The resulting M-HAP/Agar composite beads display large specific surface area (90 m2 g–1) and uniform spherical shape (150 μm). These magnetic hydroxyapatite nanoparticles in beads can provide more adsorption sites due to their suitable porous structure. As a result, the adsorbent exhibits excellent performance in adsorption of Pb2+, Co2+, and Cu2+, showing maximum binding capacities as high as 842.6, 105.1, ...
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