Synthesis and properties of a magnetic core-shell composite nano-adsorbent for fluoride removal from drinking water
Synthesis and properties of a magnetic core-shell composite nano-adsorbent for fluoride removal from drinking water
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DOI：
10.1016/j.apsusc.2014.08.143
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发表时间：
2014-10
影响因子：
6.7
通讯作者：
Chang Zhang;Lin Chen;Ting-Jie Wang;C. Su;Yong Jin
中科院分区：
文献类型：
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作者：
Chang Zhang;Lin Chen;Ting-Jie Wang;C. Su;Yong Jin
采用共沉淀法在磁性Fe3O4颗粒表面包覆Fe-Ti双金属氧化物，制备了一种饮用水除氟吸附剂。该吸附剂是一种具有核壳结构的纳米复合材料，由直径10-20 nm的磁性Fe3O4核和几纳米厚的非晶态吸附剂壳组成。对合成工艺参数进行了优化，使其具有较高的吸附容量和磁化强度。Fe-Ti双金属氧化物壳层与Fe3O4核的最佳质量比为2.72。吸附等温线符合Langmuir等温式，饱和吸附容量为57.22 mg/g。吸附速度快，在2min内达到平衡。该纳米吸附剂是超顺磁性的，饱和磁化强度为18.4×emu/g，这使得吸附剂可以通过外部磁体从水溶液中快速分离。
An adsorbent for fluoride removal from drinking water was prepared by coating Fe–Ti bimetallic oxide on magnetic Fe3O4particles by co-precipitation. The adsorbent was a nanosized composite with a core–shell structure comprising a magnetic Fe3O4core of 10–20 nm in diameter and an amorphous adsorbent shell of several nanometer thickness. The synthesis parameters were optimized to give high adsorption capacity and high magnetization. The optimized mass ratio of the Fe–Ti bimetallic oxide shell to Fe3O4core was 2.72. The adsorption isotherm was well fitted with the Langmuir isotherm and the saturation adsorption capacity 57.22 mg/g adsorbent. Adsorption was fast and reached equilibrium within 2 min. The nano-adsorbent was superparamagnetic with a saturation magnetization of 18.4 emu/g, which allowed rapid separation of the adsorbent from the water solution by an external magnet.