Removal of Ni(II) from aqueous solutions by sulfide-modified nanoscale zero-valent iron supported by hydroxyapatite (HAP/S-nZVI)
Year: 2021
Type: article
Abstract: Sulfide-modified nanoscale zero-valent iron (S-nZVI) has been widely used to remove various contaminants due to its excellent reactivity and selectivity. In this study, hydroxyapatite-supported sulfide-modified nZVI (HAP/S-nZVI) was synthesized and applied for Ni(II) elimination. The excellent performances of HAP/S-nZVI in Ni(II) removal showed that 98.25% of Ni(II) were removed using HAP/S-nZVI (1:0.5) after 15 min, much higher than HAP, nZVI and other adsorbents, and maximum adsorption capacity reached 302.27 mg g -1 at pH = 7 and 298 K. The morphology and structure of HAP/S-nZVI (1:0.5) composites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy and other techniques, which verified the high disperse and activity of nZVI after sulfide-modified and supported by HAP. Furthermore, the stability study confirmed that the sulfide-modified nZVI can retain high Ni(II) removal efficiency than that of pristine nZVI after storage 60 d due to such powerfully protective layers of FeS x synthesized during the sulfide modification. The pseudo-second-order kinetic model and Freundlich isotherm model more conform to describe the removal of Ni(II). The dynamic adsorption experiments further illustrated its potential ability for real applications.
Source: Desalination and Water Treatment
Authors: Hui Xu, Minzhang Chen, Yajuan Zhang, Pengdong Chen, Yong Chen
Institution: Lanzhou University of Technology
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $1,000
OpenAlex ID: W4205324951