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Reinforced Adsorption Mechanism of Fluorine Ions by Calcium-depleted Hydroxyapatite and Application in the Raffinate from the Vanadium Industry by Jianying Huang; Tao Liu; Yimin Zhang; Pengcheng Hu is a Engineering article available to read on EtoBox.

What is Reinforced Adsorption Mechanism of Fluorine Ions by Calcium-depleted Hydroxyapatite and Application in the Raffinate from the Vanadium Industry about?

Calcium-deficient hydroxyapatite (Ca-d HAP), an adsorbent of high defluoridation capacity with lattice defect, was prepared from vanadium industrial waste neutralization slag (NS). The adsorption performance was compared to commercially available stoichiometric HAP (S-HAP) under different solution conditions, and Ca-d HAP was superior to S-HAP. The specific surface area of Ca-d HAP was considerable (118.32 m2/g), which was 3.176 times larger than that of S-HAP (37.25 m2/g), and this was the main reason for the strong adsorption performance of Ca-d HAP. Meanwhile, due to the presence of minor impurities, such as Al and Fe, in NS, the doping of Al and Fe reduced the crystallinity after Ca-d HAP synthesis, which provided additional active sites for binding to other ions. In addition, combined with characterization analysis, it was speculated that some Ca ions in Ca-d HAP were replaced by Na ions with stronger ion-exchange properties, enhancing its adsorption performance. The adsorption mechanism of Ca-d HAP on F- ions was further investigated by discussing the surface potential, initial pH, adsorbent dosage, initial fluorine concentration, adsorption thermodynamics, and kinetics. Resu

Who reads Reinforced Adsorption Mechanism of Fluorine Ions by Calcium-depleted Hydroxyapatite and Application in the Raffinate from the Vanadium Industry?

Author

Jianying Huang; Tao Liu; Yimin Zhang; Pengcheng Hu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)