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- Title
Modified phoenix tree leaves and their adsorption removal of Ca<sup>2+</sup> from wastewater.
- Authors
Sen Wang; TianLong Li; Pei Yi; JiaoJiao Yuan
- 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). 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.
- Subjects
FOURIER transform infrared spectroscopy; ADSORPTION kinetics; LANGMUIR isotherms; SEWAGE; ADSORPTION (Chemistry)
- Publication
ScienceAsia, 2021, Vol 47, Issue 4, p506
- ISSN
1513-1874
- Publication type
Article
- DOI
10.2306/scienceasia1513-1874.2021.061