【摘要】 研究采用镁铝层状双（氢）氧化物（MgAl-LDH）及其焙烧产物（MgAl-LDO）去除水溶液中的亚铁氰离子([Fe（CN）₆]^4-)。采用共沉淀法制备了不同CO₃^2-、Cl^-插层浓度的MgAl-LDH，并通过焙烧法制备了不同的MgAl-LDO。探究了LDH及LDO对[Fe（CN）₆]^4-的吸附性能。结果表明：LDH具有较快的吸附速率，可在20 min内实现吸附平衡；LDO具有较高的吸附容量，最高为234.4 mg/g；在pH值为7～12时，吸附剂对[Fe（CN）₆]^4-均有较好的吸附效果；在含有高浓度SO₄^2-及SCN^-溶液中，吸附剂能实现[Fe（CN）₆]^4-的选择性吸附。对反应机理的分析表明：在LDH的插层阴离子中，只有Cl^-能与[Fe（CN）₆]^4-发生离子交换产生吸附效果，并生成Al[FeMg（CN）₆];LDO对[Fe（CN）₆]^4-的吸附作用源于其“记忆效应”，LDH层间CO₃^2-占比越高，相应LDO的吸附容量越大。更多还原

【Abstract】 This study investigates the removal of ferrocyanide ions ([Fe（CN）₆]^4-) from aqueous solutions using MgAl layered double （hydro） oxides（MgAl-LDH） and their roasting products （MgAl-LDO）.MgAl-LDH with different concentrations of CO₃^2-and Cl^-intercalates were synthesized by co-precipitation,and various MgAl-LDO were prepared by roasting.The adsorption performance of LDH and LDO for[Fe（CN）₆]^4-was explored.The results show that LDH exhibits a rapid adsorption rate,achieving equilibrium within 20 min.LDO has a higher adsorption capacity,reaching a maximum of 234.4 mg/g.The adsorption is effective at pH values between 7 and 12.The adsorbent also demonstrates selective adsorption of[Fe （CN）₆]^4-in solutions containing high concentrations of SO₄^2-and SCN^-.Mechanism analysis indicates that in LDH intercalated anions,only Cl^-can exchange with[Fe（CN）₆]^4-,leading to adsorption and forming Al[FeMg（CN）₆].The adsorption of[Fe（CN）₆]^4-by LDO is attributed to its"memory effect"with higher CO₃^2-content in LDH layers corresponding to greater adsorption capacity of LDO.更多还原