Supporting of Potassium Copper Hexacyanoferrate on Porous Activated Carbon Substrate for Cesium Separation

Abstract

Activated carbon (AC) was chosen for carrying potassium copper hexacyanoferrate (KCuCF) to prepare a new Cs-selective material. The adsorbent was prepared by repetitious batch precipitation reaction of Cu 2þ with [Fe(CN) 6 ] 4À . Characterization analyses identified the backbone formula of the activated carbon-supported KCuCF with K 2 Cu[Fe(CN) 6 ], and shown the successful loading of KCuCF microcrystals on the porous carbon substrate with a loading percentage of 12.5 wt%, and with BET specific surface area and a total pore volume of 527.8 m 2 =g and 0.38 cm 3 =g for AC and 160.8 m 2 =g and 0.16 cm 3 =g for KCuCF-loaded activated carbon (KCuCF-AC), respectively. The optimal Cs adsorption capacity of about 0.46 mmol Á g À1 was observed between the HNO 3 concentration of 0.5-1.5 M, and the capacity even reached to 0.38 mmol Á g À1 in the presence of a large amount of competing cations. The results indicate that activated carbon has no significant effect on the selectivity of the as-synthesized composite.

Organically modified clay with potassium copper hexacyanoferrate for enhanced Cs+ adsorption capacity and selective recovery by flotation

“…6, pristine montmorillonite exhibited a relatively low Cs + selectivity, Kd = 1.81 × 10 3 mL/g, whereas Mont-HCF(DT0.1) resulted in very high Cs + selectivity, Kd = 1.10 × 10 5 mL/g. Such data confirmed that even in complex ionic environments composed of many competing cations, the composite adsorbent performs well in regards to Cs + adsorption, unlike pristine montmorillonite, which has previously been reported to perform poorly in competing cationic environments 36,41 . The significant enhancement in Kd for Mont-HCF(DT0.1) compared to pristine montmorillonite relates to the high Cs + selectivity of the HCF cubic structure.…”

An isotope dilution–precipitation process for removing radioactive cesium from wastewater

“…When prepared, however, the solid ferrocyanides are so finely divided that they are unsuitable for use in ion-exchange columns. Attempts have been made to develop special processes that produce larger, granular solids intended for column use [7], while others have investigated a more suitable support structure [8][9][10][11]. Some researchers however, have forgone the column application and used the metal ferrocyanide as a direct precipitant/absorber of cesium.…”

Nanostructured potassium copper hexacyanoferrate-cellulose hydrogel for selective and rapid cesium adsorption

“…Since the former strategy immobilizes ion-exchangers onto the support surface, porous materials such as mesoporous silica [19,20] and carbon allotropes [21][22][23][24] are normally used. For the latter, ion-exchangers can be immobilized by encapsulation in polymer matrices such as chitin [3,18], alginate [21,25], and polyacrylic acid [26].…”