-80-第45卷第6期非金属矿Vol.45No.62022年11月Non-MetallicMinesNovember,2022剥离型膨润土对水中共存Pb2+、Zn2+、Cd2+的吸附研究何春彦莫伟*黄钰华苏秀娟封金鹏（广西大学资源环境与材料学院，广西南宁530004）摘要为提高膨润土对水中共存重金属阳离子的吸附效果，采用物理方法对膨润土进行剥离处理后用于水中共存Pb2+、Zn2+、Cd2+的吸附处理，考察了吸附时间、溶液初始质量浓度和溶液初始pH值对吸附效果的影响，并通过X射线衍射（XRD）、傅里叶红外光谱（FTIR）、X射线光电子能谱（XPS）等表征手段探究其对重金属离子的作用机制。结果表明，剥离处理有利于提高膨润土对水中Pb2+、Zn2+的吸附；在吸附剂为0.5g，时间为10min，溶液初始质量浓度为350mg/L，体系pH值为5.14的条件下，剥离型膨润土对Pb2+、Zn2+、Cd2+的最大吸附量可分别达到26.72mg/g、16.44mg/g、16.83mg/g；剥离型膨润土对上述离子的吸附形式主要有离子交换作用、静电作用和表面配位作用。本研究为利用剥离型膨润土高效去除水中共存阳离子型重金属离子提供了新思路。关键词剥离型膨润土；重金属离子；吸附；作用机制中图分类号：TQ424文献标志码：A文章编号：1000-8098(2022)06-0080-06AdsorptionofPb2+,Zn2+,Cd2+CoexistinginWaterbyExfoliatedBentoniteHeChunyanMoWei*HuangYuhuaSuXiujuanFengJinpeng(SchoolofResources,EnvironmentandMaterials,GuangxiUniversity,Nanning,Guangxi530004)AbstractInordertoimprovetheadsorptioneffectofbentoniteoncoexistingcationicheavymetalsinwater,thebentonitewasexfoliatedbyphysicalmethodandthenwasusedfortheadsorptiontreatmentofcoexistingPb2+,Zn2+andCd2+inwater.Inthispaper,theeffectsofadsorptiontime,initialsolutionconcentrationandinitialpHvalueontheadsorptioneffectwereinvestigated,andthemechanismofitsactiononheavymetalionswasexploredbyXRD,FTIRandXPS.TheresultsshowedthattheadsorptionofPb2+andZn2+bybentonitecouldbeimprovedthroughexfoliatingtreatment.Undertheconditionsofadsorbentdosageof0.5g,timeof10min,initialconcentrationof350mg/LandpHvalueof5.14,themaximumadsorptionamountofPb2+,Zn2+andCd2+byexfoliatedbentonitecouldreach26.72mg/g,16.44mg/g,16.83mg/g,respectively.Theadsorptionformsoftheaboveionsbyexfoliatedbentonitemainlyincludedionexchange,staticelectricityandsurfacecoor...
