Particle size distribution and composition analysis of ferrocyanide in wastewater containing cesium ions
Ferrocyanide is an important water treatment method for radioactive Cs+-containing wastewater.To ex-plore the replacement mechanism and the basic properties of ferrocyanide when treating Cs+ ions,ferricyanide was produced in different simulated solutions by the addition of a co-precipitant at a ratio of M2+/Fe(CN)4-6 = 1.33(where M2+ is Ni2+,Cu2+,Co2+,or Cd2+).The particle size distribution of the co-precipitates formed by M(NO3)2 and potassium ferrocyanide was examined using a laser particle size distribution instrument.The obtained ferrocyanides were dissolved in perchloric acid and a heating device to analyze their composition.The results showed that the particle size of the co-precipitate is almost in the range of 0.1～10 μm.Cs+ and Mg2+ ions primarily replaced K+ ions and partially replaced M2+ ions in the co-precipitate,and Na+ ions only replaced K+ ions.The re-moval rate of 1.00 mg/L Cs+ ions is higher than 99%,and the adsorption capacity is above 310 mg/g.In conclu-sion,the particle size of ferricyanide is small,and the existence of Na+ and Mg2+ does not influence the removal of Cs+ ions by ferricyanide.
ferrocyanideparticle size distributioncomposition analysisreplacement mechanismremoval ratedistribution coefficientadsorption capacitysimulated sea water
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