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首页> 外文期刊>Advanced functional materials >pH-Controlled Switch over Coadsorption and Separation for Mixed Cs~+ and Sr~(2+) by an Acid-Resistant Potassium Thioantimonate
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pH-Controlled Switch over Coadsorption and Separation for Mixed Cs~+ and Sr~(2+) by an Acid-Resistant Potassium Thioantimonate

机译：pH-Controlled Switch over Coadsorption and Separation for Mixed Cs~+ and Sr~(2+) by an Acid-Resistant Potassium Thioantimonate

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摘要

Switchable coadsorption and separation for elimination/partitioning of Cs+ and Sr2+ is achieved by pH-controlled ion exchange using a potassium thioantimonate K2Sb4S7 center dot 2H(2)O (SbS-1K) with fantastic pH durability from diluted NaOH (pH 12) to concentrated HCl (3 m). At pH 6, SbS-1K exhibits ultrafast adsorption kinetics (R approximate to 90% in 2 min for Cs+ and 20 min for Sr2+) and high removal rates (R approximate to 98-99%) at equilibrium for both Cs+ and Sr2+. At pH 2, the Sr2+ adsorption is inhibited by H+ with a great loss in R-Sr to 11.18%, whereas the R-Cs remains at 96.99%, contributing to a top-ranked separation factor SFCs/Sr of 256. The SbS-1K-filled ion exchange column can be switched between the eliminating (R-Cs 99.91%; R-Sr 98.19%) and separating (R-Cs 98.99%; R-Sr approximate to 0 +/- 3%) modes for treating continuous flow with a variation from pH 6 to pH 2 or vice versa. The SbS-1K/PTFE membrane exhibits coadsorption and separation effects for filtration of low concentrated mixed Cs+ and Sr2+ solution (1 ppm for each), even at an ultrafast vacuum filtration speed (30 mL min(-1)). Combined with easy synthesis and high beta/gamma irradiation resistance, SbS-1K represents a new-concept bifunctional exchanger with discriminating intelligence for equipment innovation.

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