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Research articles

ScienceAsia 47 (2021): 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