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In this study, NiFe 2 O 4 /hydroxyapatite/graphene quantum dots (NiFe 2 O 4 /HAP/GQDs) as nano-adsorbent to remove cadmium (Cd 2+ ) from aqueous solution were synthesized. This nano-adsorbent was depicted by some techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). Adsorption studies were conducted to investigate the effect of contact time, pH, adsorbent dosage and initialdoi:10.1007/s40097-018-0284-3 fatcat:cmznjvrwgjb4hfia3uqvfmtsoy