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Study the Adsorption of Humic Acid by Nano-amorphous Calcium Phosphate
WEI Wei *,JIANG Ling
School of Environment, Nanjing Normal University, Nanjing 210023
*Correspondence author
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Funding: Research Fund for the Doctoral Program of Higher Education （No.20133207120019）
Opened online:25 April 2017
Accepted by: none
Citation: WEI Wei,JIANG Ling.Study the Adsorption of Humic Acid by Nano-amorphous Calcium Phosphate[OL]. [25 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725688
 
 
In this work, stabilized nano-amorphous calcium phosphate (nACP) was prepared using polyethylene glycol as stabilizer to obtain a nanosized amorphous adsorbent. The produced nACP was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning Electron microscopy (SEM). The adsorption efficiency of the adsorbent for the removal of humic acid (HA) was evaluated under the effects of medium pH, contact time, temperature and ionic strength. The results of the study showed very good adsorption performance towards aqueous HA. The Sips modeling results revealed that the stabilized nACP adsorbent had a considerably high adsorption capacity (248.3 mg/g) for HA at 298 K. The adsorption data fitted well into pseudo-second order and Elovich kinetic models. By taking into account all results it was concluded that the nACP adsorbent leveraged its stability in combination with its high uptake capacity to offer a great promise for the removal of HA from aqueous solution.
Keywords:environmental engineering; nano-amorphous calcium phosphate; adsorbent; kinetics and isotherms; humic acid
 
 
 

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