以偏铝酸钠(NaAlO2)和氯化铝(AlCl3.6H2O)为铝源,葡萄糖(C6H12O6·H2O)为模板剂,采用水热及高温焙烧技术制备了不同晶型的氧化铝.用X射线衍射(XRD)、扫描电镜(SEM)、N2吸附脱附(BET)对制备产物的晶型、形貌及孔结构进行了表征.研究了不同晶型氧化铝对F-的吸附性能,结果表明550℃条件下的煅烧产物γ-Al2O3对F-的吸附效果最佳.吸附等温线结果表明介孔γ-Al2O3吸附F-为单层吸附,其Langmuir最大吸附容量为5.96 mg/g.吸附动力学试验表明,介孔γ-Al2 O3在5min内已吸附超过90％的F-,且吸附过程与准二级动力学模型相吻合.介孔γ-Al2O3吸附F-的机理涉及OH-与F-的离子交换.
A series of mesoporous alumina with different crystalline types were successfully synthesized by using hydrothermal and high temperature roasting technologies,which employed sodium aluminate and aluminium chloride as the aluminum source,and glucose as the template agent.Structures,morphologies and textural properties of the products were characterized by XRD,SEM and BET,and defluoridation effects of the synthesized mesoporous alumina with different crystalline types were investigated by batch adsorption experiments.The experimental results showed that γ-Al2O3 prepared at 550 ℃ calcination temperature exhibited the excellent performance for fluoride removal.The adsorption isotherm was better described by the linear Langmuir model with a maximum adsorption capacity of 5.96 mg/g.The adsorption kinetics experiments indicated a high fluoride adsorption rate,as more than 90％fluoride ions were adsorbed within 5 minute.In addition,the adsorption kinetics was well fitted with linear pseudo-second-order model,with a correlation coefficient value (R2) of 0.992 1.According to the results of the present study,the adsorption mechanism may involve ion exchange between F-and OH-.
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