Adsorption of heavy metal ions on crown ether adsorbents
- 1 January 1987
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 112 (10) , 1413-1416
- https://doi.org/10.1039/an9871201413
Abstract
Granular entrapped adsorbents of crown ether-phosphotungstic acid (PW) and crown ether-phosphomolybdic acid (PMo) in polyacrylamide were prepared by the sol-gel method and used for the adsorption of various heavy metals ions such as Ag+, Pb2+, Hg2+, Cd2+, Fe3+ and Zn2+. Dibenzo-18-crown-6-PW (or-PMo)/polyacrylamide adsorbent gave high adsorption and a high selectivity for large metal ions such as Ag+, Pb2+ and Hg2+, but not for smaller ions. In contrast, small heavy metal ions such as Cu2+, Fe3+ and Zn2+, but not larger ions, were strongly adsorbed by 12-crown-4-PW (or-PMo)/polyacrylamide adsorbent. The effects of pH and solvents on the adsorption were investigated. A dibenzo-18-crown-6-PMo adsorbent film was also prepared and successfully applied to the selective adsorption of Ag+ ions from an aqueous solution containing various metal ions, and the Ag+ ions on the film could be determined quantitatively by X-ray fluorescence analysis.Keywords
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