文献类型：期刊文献

英文题名：Response surface methodology approach for optimization of removal of strontium by in-situ electrochemical synthesis of monohydric phosphate intercalated layered double hydroxides

作者：Yu, Xian[1];Peng, Shiming[1];Cao, Wei[1];Huang, Guangtuan[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 Asses, Shanghai 200237, Peoples R China

年份：2023

卷号：332

期号：1

起止页码：129

外文期刊名：JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY

收录：;EI(收录号：20242816664037);WOS:【SCI-EXPANDED(收录号:WOS:000906582600003)】；

语种：英文

外文关键词：Layered double hydroxides; Strontium removal; HPO42- intercalation; RSM; Adsorption mechanism

摘要：In this study, in-situ electrochemical synthesis of monohydric phosphate intercalated layered double hydroxides (LDHs) was used to remove Sr2+ from the simulated liquid radioactive wastes. The optimum reaction conditions were obtained by response surface methodology (RSM). The removal of Sr2+ can reach up to 99.30% and the adsorption capacity of Zn-Al-LDHs-HPO4 toward Sr2+ was 6.01 mg/g under optimal conditions. With Sr2+ being removed mainly by multilayer chemisorption, the adsorption kinetics followed Lagergren pseudo-second-order kinetic model, and the adsorption isotherms followed Freundlich model. Thermodynamic studies of adsorption showed that the adsorption of Sr2+ to LDHs was a spontaneous and endothermic process. This method of LDHs synthesis simplifies the operational steps and is a promising treatment method because of its low energy consumption, high efficiency and small solid waste volume. This study provides an innovative idea for the treatment of strontium-containing liquid radioactive wastes from nuclear power plants. [GRAPHICS]