以δ-Al2O3为前驱体,用浸渍及高温焙烧技术制备了结构新颖的CaO-Al2O3二元复合氧化物吸附剂.用XRD、SEM、FT-IR、TG及BET等手段对产物的晶型、形貌、热稳定性及孔结构等进行了表征.同时,研究了pH值及吸附时间对CaO-Al2O3除氟率的影响.结果表明,δ-Al2O3及CaO-Al2O3均为纳米颗粒形貌,具有介孔结构,比表面积分别为167.8 m2/g和72.3 m2/g;在pH=8.0时,CaO-Al2O3的除氟效果最佳,当吸附时间超过220 min时,CaO-Al2O3的除氟效率明显高于δ-Al2O3,且在480 min时F-的去除率达65.42％.%A novel binary oxide adsorbent of CaO-Al2O3 was successfully prepared via impregnation technology followed by calcination procedure with δ-Al2O3 as a precursor.The adsorbent was thoroughly characterized by XRD,SEM,FT-IR,TG and BET technics in order to investigate its crystalline,morphology,thermal stability and structural properties.At the same time,the effects of pH and adsorption time on the fluoride removal were thoroughly studied by a batch of adsorption experiments.The experimental results indicated that both δ-Al2O3 and CaO-Al2O3 present nano-sized particle morphology with mesoporous structure.The specific BET surface areas of δ-Al2O3 and CaO-Al2O3 were 167.8 m2/g and 72.3 m2/g,respectively.The optimal pH value for fluoride removal by CaO-Al2O3 was about 8.0.Adsorption capacity of CaO-Al2O3 was higher than Al2O3 when the adsorption time exceeded 220 min,and the fluoride removal rate reached 65.42％when the adsorption time was 480 min.
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