水合氧化铈铝柱撑锂皂石对氟的吸附性能研究

Adsorption property of fluoride ion on laponite pillared by hydrous ceria and alumina

以锂皂石为层间黏土原料,通过微波插层反应,制备了水合氧化铈铝柱撑锂皂石新型层柱材料,采用FTIR、XRD、SEM等分析手段对材料的结构进行了表征,并研究了该材料对氟的吸附性能.结果表明,水合氧化铈铝进入锂皂石层间,形成具有层状微晶结构的柱撑锂皂石材料.随着铈铝柱化剂与锂皂石质量比(Xm)的增大,材料片层结构的层间距扩大、结晶度提高、表面结构更丰富.该材料对F-的吸附率随Xm、吸附剂用量的增大而提高,吸附过程符合Langmuir等温吸附方程;当Xm达到0.1、吸附剂用量为0.2g/L时,该材料在60min内对F-的吸附率可达到90%,吸附量达13.5mg/g,该吸附作用受温度、pH值的影响不大.

The laponite pillared by hydrous ceria and alumina was prepared using synthetic laponite as interlayer clay by microwave intercalation reaction method.The micro-structure of pillared laponite was characterized by FTIR,XRD,SEM,and its adsorption property of fluoride ion was investigated.Hydrous ceria and alumina could be intercalated into the structure of laponite and a layered microcrystalline structure could be formed.With the increase of mass ratio（Xm） of Ce-Al pillaring agent and laponite,the d001 value of interlayer distance of the structure was enlarged,the crystallinity was improved and the delaminated layer structures were more abundant.As the Xm and sorbent dose were increased,the adsorption rate of fluoride ion was also increased,and the adsorption isotherm of the pillared laponite to fluoride ion could be well fitted by the Langmuir equation.When the Xm was 0.1,with 0.2g/L of the sorbent,the adsorption rate reached to 90%,and the adsorption capacity reached to 13.5 mg/g within 60min,while temperature and pH value had little effects on the adsorption process.