Abstract In situ electrochemical synthesis of Zn-Al layered double hydroxides (LDHs) was adopted to remove strontium in the simulated liquid radioactive waste (LRW). In this paper, response surface methodology (RSM) was used to optimize the experimental conditions and assess the effect of the process variables and their interactions on Sr2+ removal. The experimental design was developed by Box-Behnken model. The optimal experimental conditions were determined as current density of Zn electrode 108 mA/cm2, Zn/Al current ratio 2, reaction temperature 60°C, and initial pH 9. Removal of Sr2+ reached 99.15 % at the initial concentration of 5 mg/L Sr2+ in the simulated LRW under the optimal experimental condition. The results of the adsorption kinetics experiments showed that the process was divided into two stages. The first stage with faster adsorption rate followed the pseudo-first-order model, while the second stage fitted the pseudo-second-order model better.

中文翻译：

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用于去除锶的 Zn-Al 层状双氢氧化物的原位电化学合成：优化和动力学研究

摘要 采用原位电化学合成锌铝层状双氢氧化物（LDHs）去除模拟液体放射性废物（LRW）中的锶。在本文中，响应面法 (RSM) 用于优化实验条件并评估过程变量及其相互作用对 Sr2+ 去除的影响。实验设计由 Box-Behnken 模型开发。最佳实验条件为Zn电极电流密度108 mA/cm2，Zn/Al电流比2，反应温度60°C，初始pH 9。初始浓度5 mg/L时Sr2+去除率达到99.15%最佳实验条件下模拟LRW中的Sr2+。吸附动力学实验结果表明，该过程分为两个阶段。