-86-第46卷第1期非金属矿Vol.46No.12023年1月Non-MetallicMinesJanuary,2023不同水滑石对水体中砷（As5+）的吸附去除麻梦梦周丹*王起晗黄艺(成都理工大学生态环境学院，四川成都610059)摘要采用共沉淀法制备了镁铝水滑石（Mg-AlLDHs）、镁铁水滑石（Mg-FeLDHs）和镁锰水滑石（Mg-MnLDHs）3种水滑石，利用X射线衍射（XRD）仪和傅里叶红外光谱（FTIR）仪表征了3种水滑石的基本性质，通过等温吸附试验和吸附动力学试验研究了不同水滑石材料对水体中砷（As5+）的去除性能。结果表明，3种水滑石对水中As5+的吸附过程均符合Langmuir吸附模型及准二级动力学模型，拟合结果显示，Mg-FeLDHs对As5+的吸附量最大，为202.429mg/g；Mg-MnLDHs对As5+的吸附速率最快，为0.007150mg/(g⋅min)。通过吸附前后FTIR表征试验，结合水滑石特殊的结构性质，推断水滑石对As5+的吸附机理为砷酸根扩散至水滑石层状孔隙后，水滑石层板阳离子与砷酸根发生表面络合。关键词水滑石；砷（As5+）；吸附；环境水体中图分类号：X52；O647.3文献标志码：A文章编号：1000-8098(2023)01-0086-05AdsorptionandRemovalofArsenic(As5+)inWaterbyDifferentHydrotalcitesMaMengmengZhouDan*WangQihanHuangYi(SchoolofEcologicalEnvironment,ChengduUniversityofTechnology,Chengdu,Sichuan610059)AbstractInthisstudy,threedifferenthydrotalcites(Mg-AlLDHs,Mg-FeLDHsandMg-MnLDHs)werepreparedbytheco-precipitationmethod.ThebasicpropertiesofthethreehydrotalciteswerecharacterizedbyXRDandFTIR.TheremovalperformanceofdifferenthydrotalcitematerialsforAs5+inwaterwasstudiedbytheisothermaladsorptiontestandadsorptionkineticstest.TheexperimentalresultsshowedthattheisothermaladsorptionmodelsofthethreehydrotalciteswereinlinewiththeLangmuiradsorptionmodel,andtheadsorptionkineticmodelwasmoreinlinewiththequasi-second-orderkineticmodel.ThemodelfittingresultsshowedthattheadsorptioncapacityofMg-FeLDHsforAs5+wasthelargest,upto202.429mg/g.TheadsorptionrateofAs5+onMg-MnLDHswasthefastest,upto0.007150mg/(g·min).ByFTIRspectrumcharacterizationtestbeforeandafteradsorption,combinedwiththespecialstructuralpropertiesofhydrotalcite,itisconcludedthattheadsorptionmechanismofhydrotalciteforAs5+wasthatafterthediffusionofarsenatetothelayeredpores...
