Abstract The present study aims at understanding the sorption performance of gamma irradiated bentonite clay (Bentoγ) for cesium (Cs) ions as compared to native bentonite (BentoN). BentoN was irradiated up to a dosage of 100 KGy using high intensity 60Co source. The uptake of Cs using both BentoN and Bentoγ clay sorbents was investigated from aqueous medium over a wide concentration range (50–1000 mg L-1) in batch mode and the distribution coefficients for Cs were determined. Batch studies revealed that maximum sorption of cesium occurred within 10 min of contact with the sorbent at a solution pH 6. The sorption data was analyzed using non-linear Langmuir and Freundlich adsorption isotherms. The characterization of bentonite using different physicochemical techniques like SEM, XRD and FTIR illustrated that there were minor structural changes after irradiation. The effect of gamma irradiation on the structural properties of constituent clay minerals of bentonite and the resultant reduction in the sorption capacity of the sorbent has been correlated in order to get an insight into the sorption mechanism.

中文翻译：

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天然和伽马辐照膨润土对铯离子吸收的比较研究

摘要 本研究旨在了解与天然膨润土 (BentoN) 相比，γ 辐照膨润土 (Bentoγ) 对铯 (Cs) 离子的吸附性能。使用高强度 60Co 源对 BentoN 进行高达 100 KGy 的辐照。使用 BentoN 和 Bentoγ 粘土吸附剂在较宽的浓度范围 (50–1000 mg L-1) 中以分批模式从水性介质中研究 Cs 的吸收，并确定 Cs 的分配系数。批量研究表明，铯的最大吸附发生在与溶液 pH 值为 6 的吸附剂接触后 10 分钟内。使用非线性 Langmuir 和 Freundlich 吸附等温线分析吸附数据。使用不同的物理化学技术（如扫描电镜）对膨润土进行表征，XRD 和 FTIR 表明辐照后有微小的结构变化。为了深入了解吸附机制，将伽马辐射对膨润土组成粘土矿物的结构特性的影响与吸附剂吸附能力的降低相关联。