Research articles
ScienceAsia 47 (2021):ID 506-513 |doi:
10.2306/scienceasia1513-1874.2021.061
Modified phoenix tree leaves and their adsorption
removal of Ca2+ from wastewater
Sen Wanga,b,*, TianLong Lia, Pei Yia, JiaoJiao Yuana
ABSTRACT: Too much Ca2+ in the water would have a bad effect on the papermaking process. Phoenix tree leaves
were modified by NaOH or H3PO4 treatment for Ca2+ adsorption and characterized by X-ray diffraction (XRD), scanning
electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR replica watches). The effects of adsorption time, particle
size, and adsorbent dosage on Ca2+ adsorption from wastewater were studied. Moreover, the adsorption kinetics and
thermodynamics of Ca2+ adsorption before and after modification were analyzed. Results showed that the surface of
natural phoenix tree leaves is relatively smooth without obvious porosities prior to modification. After modification,
the surface of the leaves became loose and rough; and concave pores were also found. After NaOH-modification,
functional groups on the surface of the phoenix tree leaves increased, which is conducive to adsorption. The removal
effect of Ca2+ by NaOH-modified leaf adsorbent was better than that by H3PO4. Under optimal conditions, the NaOHmodified phoenix tree leaves had a removal efficiency of 74.18% for Ca2+ in the wastewater. The adsorption process
was consistent with the pseudo-second-order kinetic reaction and Langmuir isotherm equations.
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| a |
School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi?an
710021 China |
| b |
National Demonstration Center for Experimental Light Chemistry Engineering Education
(Shaanxi University of Science & Technology), Xi?an 710021 China |
* Corresponding author, E-mail: wangsen@sust.edu.cn
Received 10 Dec 2020, Accepted 25 Apr 2021
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