Synthetic inorganic ion-exchange materials. Part XLIX. Adsorption and desorption behaviour of heavy metal ions on hydrated titanium dioxide
- 1 January 1989
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 114 (4) , 435-438
- https://doi.org/10.1039/an9891400435
Abstract
The ion-exchange selectivity of a number of divalent metal ions was studied as a function of pH in nitrate and chloride media. The order of selectivity was Pb2+ > Hg2+ > Cd2+ > Mg2+ in nitrate solution and Pb2+ > Cd2+ > Ca2+ > Mg2+ > Hg2+ in chloride solution. A good linear relationship between the logarithm of the distribution coefficient of the heavy metal ions and their effective ionic radius was found. On the basis of the Kd values, the separation of a mixture of Cd2+, Hg2+ and Pb2+ and the group separation of Hg2+ and Pb2+ from several common metal ions were achieved on an ion-exchange column containing amorphous hydrated titanium dioxide.Keywords
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