metal ion adsorption
Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Abstract The interaction of hydrolysable lead ions with a thermosensitive, anionic microgel dispersion of N-isopropylacrylamide modified with acrylic acid comonomer has been investigated as a function of pH. The conformation of the anionic microgel was observed by dynamic light scattering to reversibly alter due to changes in either temperature or pH, or due to the presence of lead ions. The hydrodynamic diameter of the microgel particles increases with increasing pH. However, upon increasing the temperature or in the presence of Pb (II) at pH 5, the hydrodynamic diameter decreases. The adsorption behavior of hydrolysable metal ions at the microgel-solution interface as a function of pH were investigated using adsorption isotherms and electrophoretic mobility measurements. Adsorption, and desorption, of Pb (II) on to the microgel surface is dependent upon the lead hydrolysis products and, to a lesser extent, the surface properties of the microgel. Lead ion adsorption was also demonstrated to be completely reversible by pH adjustment but temperature manipulation had minimal effect.
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