Article history: Stabilized nano-amorphous calcium phosphate (nACP) was prepared using polyethylene glycol as sta- Received 27 May 2017 bilizer to obtain a nanosized amorphous adsorbent. The produced nACP was evaluated by using XRD, Received in revised form 12 July 2017 FTIR, SEM and X-ray photoelectron spectroscopy (XPS). The sedimentation test demonstrated that nACP Accepted 15 August 2017 exhibited better stability than crystallized hydroxyapatite. The adsorption efﬁciency of the nACP mate- Available online 19 August 2017 rial for aqueous humic acid (HA) was evaluated from the point of view of medium pH, adsorption time, temperature, and ionic strength, as well as the presences of metal ions. The results of the study showed Keywords: very good adsorption performance towards aqueous HA. The Sips modeling results revealed that the Nano-amorphous calcium phosphate stabilized nACP adsorbent had a considerably high adsorption capacity (248.3 mg/g) for HA at 298 K. The Stabilized adsorbent adsorption data ﬁtted well into pseudo-second order and Elovich kinetic models. XPS analyses indicated Kinetics and isotherms that HA retention on nACP material might be due to the surface complexation reaction between oxygen- Surface complexation containing group and calcium of HA and nACP, respectively. Moreover, the HA adsorption capacity of nACP
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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