Journal
MOLECULES
Volume 27, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/molecules27082392
Keywords
nickel-aluminum-zirconium complex hydroxide; colloidal silica; granulation; chromium(VI) ion; adsorption
Funding
- Kurita Water and Environmental Foundation [21K004]
- Hattori Hokokai Foundation in Japan
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A granulated agent for adsorbing heavy metals from aqueous media was prepared by combining a nickel-aluminum-zirconium complex hydroxide with colloidal silica as a binder. The granulated agent had a large specific surface area and a high number of hydroxyl groups, resulting in a strong adsorption capacity for Cr(VI) ions.
We combined a nickel-aluminum-zirconium complex hydroxide (NAZ) with colloidal silica as a binder to prepare a granulated agent for adsorbing heavy metals from aqueous media. Three samples with different particle diameters were prepared to evaluate the effects on the properties: small (NAZ-S), medium (NAZ-M), and large (NAZ-L). We confirmed the granulation of the prepared samples at a binder content of 25%. NAZ-S had the largest specific surface area and number of hydroxyl groups, followed by NAZ-M and then NAZ-L. Regarding the adsorption capacity, NAZ-S adsorbed the most chromium(VI) ions followed by NAZ-M and then NAZ-L. The binding energy of Cr(2p) at 575-577 eV was detected after adsorption, and the effects of the temperature, contact time, and pH on the adsorption of chromium(VI) ions were evaluated. We identified the following adsorption mechanism: ion exchange with sulfate ions in the interlayer region of the NAZ samples. Finally, the chromium(VI) ions adsorbed by the NAZ samples were easily desorbed using a desorption solution. The results showed that NAZ offers great potential for the removal of chromium(VI) ions from aqueous solutions.
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