Synthesis of Adsorbent Fixed with Prussian Blue Based by Illite and Adsorption of Soluble Radioactive Cesium (137Cs)

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Prussian blue (PB) is a selective and highly adsorptive material for cesium.However, it is difficult to recover after adsorption and there is a possibility of secondary environmental pollution.In this study, the surface of illite powder was modified by using acrylic acid (AA) as a crosslinking agent for stable fixation of PB to illite powder.The aim of this study was development of adsorbent with stabilized PB at illite using AA (AA-illte-PB).In XRD analysis and FT-IR analysis results of AA-illte-PB, PB characteristic peak was founded.Those results show presence of PB in AA-illte-PB.TGA analysis was performed to confirm the polymer and PB content of the adsorbent.It was judged that AA was effectively synthesized on the surface of illite modified with AA (AA-illte) through the SEM (EDS) analysis.The PB adsorption performance of AA-illte-PB was evaluated after pretreatment of NaCl for immobilization of PB on AA-illte surface.In the case of AA-illte-PB pretreated with NaCl, the maximum adsorption amount of cesium was 5.09 mg/g and the maximum adsorption amount of cesium in AA-illte-PB without NaCl pretreatment was 2.01 mg/g.Also, results of cesium adsorption analysis using 137 Cs standard source solution showed 99% removal rate for AA-illte-PB pretreated with NaCl and 88% for AA-illte-PB un-pretreated with NaCl.The efficiency of AA-illte-PB pretreated with NaCl found to be effective for cesium adsorption.UV-vis analysis was performed to identify the desorbeed PB during washing.Illite attached with PB without AA (illite-PB) was detached from a large amount of PB through 5 washes.AA-illte-PB showed a small amount of PB desorbed by the first wash.As a result, an adsorbent with stable PB immobilization was developed.