Journal
SEPARATION SCIENCE AND TECHNOLOGY
Volume 55, Issue 16, Pages 2919-2932Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01496395.2019.1659821
Keywords
Silica gel modification; novel green procedure; solid phase extractor; metal preconcentration; adsorption isotherm; kinetic modeling
Funding
- Ebonyi State University Abakaliki-Tertiary Education Trust Fund (TETFund) grant [EBSU/TETFund/IBR/2015/10]
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Aqueous solutions of 4,4 '-(1,2-ethanediyldinitrilo)bis-(2-pentanone) (EDDBP) have been used in a novel green procedure for the physical modification of silica gel (SG) for solid-phase extraction and preconcentration of Ni(II) ion. Optimization experiments were carried out at 301 +/- 1 K by batch technique. The EDDBP-modified SG was characterized using X-ray Diffraction Spectroscopy (XRD) and Brunaeur-Emmett-Teller (BET) determinations. The adsorption isotherm and kinetic models indicated a physisorption process. The modified SG showed moderate to high adsorption capacity values for Ni(II) ion (similar to 98% removal efficiency) at pH 8. A sorption mechanism for Ni(II) chelation with EDDBP-modified-SG was proposed. These results suggest the procedure has advantages.
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