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铁镧复合氧化物纳米吸附剂的制备、表征及 As(Ⅲ)吸附性能研究
Authors
张伟
张高生
陈静
Publication date
1 January 2014
Publisher
Abstract
本研究采用共沉淀法制备了一种新型铁镧复合氧化物吸附剂(Fe-La),并对其表面特性及As(Ⅲ)吸附行为进行了系统研究.扫描电镜(SEM)和透射电镜(TEM)结果表明,铁镧复合氧化物具有纳米结构,初级粒子粒径范围为20~200 nm.X-射线衍射仪(XRD)表征结果表明,铁镧复合氧化物具有类似氢氧化镧的晶型结构.N_2吸附BET法结果表明,铁镧复合氧化物的比表面积为99.3 m~2·g~(-1).盐加入法测得吸附剂的等电点为7.8.As(Ⅲ)吸附实验结果分析表明,铁镧复合氧化物对As(Ⅲ)具有良好的吸附效果,最大吸附量(pH 7.0)为58.2 mg·g~(-1),Langmuir吸附等温线可较好地拟合铁镧复合氧化物对溶液中As(Ⅲ)的吸附(R~2=0.95);吸附速率较快,240 min内可完成吸附容量的80%,Elovich模型能较好地描述吸附过程(R~2=0.97);溶液pH对铁镧复合氧化物吸附As(Ⅲ)的影响较为明显;共存阴离子对吸附影响的大小顺序为SO_4~(2-)<CO_3~(2-)<SiO_3~(2-)<PO_4~(3-)
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Last time updated on 24/06/2021