Caesium Retention Characteristics of Knifc–pan Resin From River Water

Abstract

The caesium retention characteristics of a potassium-nickel hexacyanoferrate resin in a polyacrylnitrile (KNiFC–PAN) matrix were tested in fresh water over the range of 2.5–400 mL min−1. The experimental setup used 2 mL resin and 4-L aliquots of freshwater samples. The results showed nearly 100% retention at speeds below 10 mL min−1, above 80% up to 100 mL min−1, and approached 50% at 400 mL min−1. Using 100 mL min−1 flow rate and KNiFC–PAN resin in a well-type HPGe detector, the minimum detectable concentration was reduced to 3 mBq kg−1 for 4-L aliquots of water samples from the previous 15 mBq kg−1 achieved by Powdex ion-exchange resin and a planar type HPGe detector.

New Sorbents Based on Polyacrylonitrile Fiber and Transition Metal Ferrocyanides for 137Cs Recovery from Various Composition Solutions

“…Sci. 2024, 14 of which is liquid radioactive waste of low and medium levels of activity. They pose a great environmental hazard due to their significant volume and high total activity, as well as the possibility of uncontrolled spread in emergencies and, as a consequence, environmental pollution [1].…”

“…However, it should be noted that sorbents based on AMP are prone to adsorption of 40 K, which leads to an overestimation of the result of measuring 137 Cs activity; therefore, sorbents based on transition metal ferrocyanides are preferable [4]. Transition metal ferrocyanides can be used to extract 137 Cs in pure form [12] or deposited on a support: PAN fiber (KNiFC-PAN) [4,13,14], silica gel (SiO 2 -KMCHCF [15], FSS [16], FC-Cu-EDA-SAMMS [17]), aluminosilicates (Niket-k) [18,19], chitin-containing materials (FFCG-SO 4 -FC [20], Mikoton-Cs [21], CFC Zn-K, CFC Cu-K, CPC Ni-K [22]), hydrated zirconium dioxide (Thermoxide 35) [16,23,24], activated carbon (C/NiHCFe, C/InHCFe, C/CuHCFe) [25], cellulose support (Anfezh [16,19,26], Uniket [18], NKF-C [27,28], FN and FN-50 [19,29]), natural minerals (diatomite (FND) [19,24], tripolite [30], clinoptilolite (NPF-CL) and quartz-glauconite concentrate (NPF-GL) [23,31,32]) and others. Zeoliteimidazole frameworks [33], mesoporous silica gels [34], aerogels [35], and hydrogels [36], which showed high sorption characteristics in cesium recovery, should be mentioned as new promising supports.…”

“…Unfortunately, fibrous sorbents are currently not available for use due to the lack of established industrial production in Russia. However, it should be noted that in foreign studies, sorbents based on PAN fiber-KNiFC-PAN-have become widespread for 137 Cs sorption [4,14]. Therefore, this work is aimed at obtaining and comprehensively studying highly efficient fibrous sorbents based on transition metal ferrocyanides.…”