An adsorbent called chitosan coated magnetic hydroxyapatite nanoparticles (CS-MHAP) was prepared with the purpose of\r\nimprovement for the removal of Ni2+ ions and textile dye by coprecipitation. Structure and properties of CS-MHAP were\r\ncharacterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR),\r\nand vibrating sample magnetometer (VSM). Weight percent of chitosan was investigated by thermal gravimetric analysis (TGA).\r\nTheprepared CS-MHAP presents a significant improvement on the removal efficiency ofNi2+ ions and reactive blue 19 dye (RB19) in\r\ncomparison with chitosan and magnetic hydroxyapatite nanoparticles.Moreover, the adsorption capacities were affected by several\r\nparameters such as contact time, initial concentration, adsorbent dosage, and initial pH. Interestingly, the prepared adsorbent could\r\nbe easily recycled from an aqueous solution by an external magnet and reused for adsorption with high removal efficiency.
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