Abstract

The kinetics of cesium and strontium sorption by natural clinoptilolite and its ferrocyanide-modified analogs, NPF-Cl and NPF-Cl (Ca-form), from solutions of various compositions containing 100 mg L^–1 sorbate was studied, and the texture and porosity of the sorbent samples before and after the sorption of cesium and strontium were determined. The sorption process occurs in three-stages and is limited by a heterogeneous ion exchange reaction (HIOR) on the ferrocyanide phase located on the outer surface of clinoptilolite and in its macropores, internal diffusion of cesium and strontium into sorbent granule, and precipitation of ferrocyanide phases of complex composition in small mesopores and micropores of sorbents. The HIOR and precipitation occur with involvement of solution components (sodium, calcium, and iron). Sorption of cesium and strontium is accompanied by a significant change in the texture and porosity of the sorbents.

中文翻译：

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亚铁氰化物修饰的斜发沸石在溶液中高浓度吸附铯和锶的机理

摘要

天然斜发沸石及其亚铁氰化物修饰的类似物NPF-Cl和NPF-Cl（Ca形式）从含有100 mg L ^–1的各种成分的溶液中吸收铯和锶的动力学研究了吸附剂，并测定了铯和锶吸附前后吸附剂样品的质地和孔隙率。吸附过程分为三个阶段，并受到斜发沸石外表面及其大孔中亚铁氰化物相的异质离子交换反应（HIOR），铯和锶向吸附剂颗粒内部扩散以及亚铁氰化物沉淀的限制。吸附剂的小中孔和微孔中复杂组成的两相。HIOR和沉淀是在溶液成分（钠，钙和铁）的参与下发生的。铯和锶的吸附伴随着吸附剂质地和孔隙率的显着变化。