A Comparison of Crystalline Silicotitanate and Ammonium Molybdophosphate-Polyacrylonitrile Composite Sorbent for the Separation of Cesium from Acidic Waste

Abstract

Crystalline silicotitanate manufactured and marketed by UOP as IONSIV IE-911 and an ammonium molybdophosphate3polyacrylonitrile (AMP3PAN) composite sorbent have been evaluated for the removal of cesium from Idaho National Engineering and Environmental Laboratory (INEEL) concentrated acidic tank waste. Equilibrium isotherms were generated with simulated concentrated tank waste solutions and fit to the Langmuir equation. Nonequilibrium sorption was evaluated in column tests employing 1.5 cm 3 columns operating at 5, 10 and 20 bed volumes of flow per hour. Results of the equilibrium and nonequilibrium testing for both sorbents are compared.

Adsorption of cesium on copper hexacyanoferrate–PAN composite ion exchanger from aqueous solution

“…This equation for Cs concentration was then substituted into the following relationship for dynamic capacity (DC) [8,27]: where is volume at specified breakthrough, and M is mass of CHCF-PAN sorbent (g dry). Dynamic capacity estimates of the prepared adsorbent were then obtained by evaluating the integral numerically with upper-limit volume values corresponding to approximately 5% and 100% Cs breakthrough.…”

Evaluation of Polyethersulfone‐based Composite for Selective Separation of Cesium from Acidic Media

“…12,13 Examples include silicotitanates, zeolites, metal oxides, metal hexacyanoferrates, and ammonium molybdophosphate (AMP). 9,[12][13][14][15][16] In particular, microporous vanadosilicates exclusively captured Cs + , even in seawater, showing the highest sorption capacity ever reported. 9 Despite these advantages, the small granular size of inorganic ion exchangers generally leads to slow mass transfer rate, thus hampering their use in continuous processes such as column operations.…”

“…Especially, the performance of AMP-PAN in the sorption and recovery of cesium has been most widely studied for different purposes. 5,16,21,22 On the other hand, studies on newly-developed composites have mainly focused on their Cs + -sorption capacities. 18,[23][24][25] While the sorption properties are strongly correlated with effective treatment of a radionuclide-contaminated environment, it is also important to examine Cs + -recovery behaviors from the composites for the following reasons.…”

Sorptive Removal of Radionuclides (Cobalt, Strontium and Cesium) using AMP/IO-PAN Composites

“…이러한 기술 중에서 현재 이온교환이 가장 유효 한 기술로 여겨지고 있으며, 천연 제올라이트(zeoilte) [2], 실 리코타이타네이트(silicotitanate) [3], 헥사시아노페라이트 복 합체(hexacyanoferrate complex) [4], 암모늄몰리브도포스페 이트(ammonium molybdophosphate) [5][6][7][8][9] Freundlich 모델은 다음과 같이 표현 된다 [8].…”