The sorption of strontium on biotite and some influencing factors

Abstract

The effect of ionic strength, pH, temperature and co-existing ions on the sorption of Sr 2+ on biotite was investigated by batch technique. The results showed that the sorption of Sr 2+ on biotite was ignorable at pH range from 3.0 to 5.0, and then increased sharply with the increase of pH from 5.0 to 10.0. Besides, the sorption percentage of Sr 2+ on biotite significantly decreased with the increase of ionic strength. The sorption kinetics and isotherms of Sr 2+ on biotite can be well fitted by pseudo-second-order kinetic model and Freundlich model, respectively. The results of XPS analysis indicated that Sr 2+ was mainly complexed with the iron hydroxyl on the surface of the biotite.