Abstract
The influence of surface modification of hydrated titanium dioxide (HTD) by mixed nickel–potassium ferrocyanide (NPF) phase on its selectivity for strontium and mechanism of strontium sorption was studied. It was shown that NPF-HTD sorbent possesses the same selectivity for strontium as the HTD sorbent, but higher static exchange capacity (SEC). The Henry distribution coefficient of strontium from a tap water with pH 7.8 ± 0.1 was 10(3.0 ± 0.3) L kg−1; the SEC, calculated according to Langmuir’s isotherm, was 140 mg g−1. Kinetic studies have shown that strontium sorption is limited by both internal and external diffusion as well as by the rate of chemical transformation of the NPF-HTD sorbent.
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