Abstract
Hydroxyapatite/PAM was synthesized from Ca(NO3)2 · 4H2O and H3PO4 by an ultrasonic-assisted chemical precipitation method, and was used to remove Cu2+. The structure, morphology and size of the product were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM) and so on. The effects of pH, reaction time, temperature, initial concentration of Cu2+, and adsorbent dosage on the adsorption reaction were also investigated, the results showed that the maximum adsorption capacity was 105.05 mg/g with 2.0 g/L adsorbent under stirring at 35 °C for 60 min with an initial concentration of Cu2+ of 300 mg/L. In addition, the removal rate reached 90.39%. Desorption experiments also indicated that PAM-HA had strong adsorption capacity. Quasi-first-order and quasi-second-order kinetics models were established to explore the adsorption mechanism, founding that adsorption mechanism was ion exchange which conformed to pseudo-second-order kinetics. Therefore, the PAM-HA can be used as a high-efficiency adsorbent for Cu2+.
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