文献类型：期刊文献

英文题名：In situ electrochemical synthesis of Zn-Al layered double hydroxides for removal of strontium: Optimization and kinetics study

作者：Jiang, Li[1];Huang, Guangtuan[1];Shao, Lifeng[1];Huang, Jing[1];Peng, Shiming[1];Yang, Xing[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Natl Engn Lab Ind Wastewater Treatment, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2021

卷号：608

外文期刊名：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

收录：;EI(收录号：20203909251515);WOS:【SCI-EXPANDED(收录号:WOS:000596332000001)】；

语种：英文

外文关键词：Zn-Al LDHs; Strontium; In situ electrochemical synthesis; RSM; Adsorption kinetics

摘要：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/cm(2), Zn/Al current ratio 2, reaction temperature 60 degrees 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.