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Adsorption mechanism for removing different species of fluoride by designing of core-shell boehmite.
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2020-03-19 , DOI: 10.1016/j.jhazmat.2020.122555
Lei Huang 1 , Zhihui Yang 2 , Yingjie He 3 , Liyuan Chai 2 , Weichun Yang 2 , Haoyu Deng 3 , Haiying Wang 2 , Yongsheng Chen 4 , John Crittenden 4
Affiliation  

Many kinds of adsorbents have been developed for removing fluoride from water. However, the unclear actual mechanism of fluoride adsorption greatly restricts the structural design and application of novel adsorbents. Based on the understanding of the interaction between hydroxyl and fluoride, a novel core-shell nanostructure of boehmite was synthesized via an in-situ-induced assembly for removing fluoride. The formed polycrystalline boehmite (γ-AlOOH) nanostructure significantly enhances adsorption performance. The transformation of fluoride forms (including F-, HF, HF2-) is closely related to the solution property. The acidic solution is more favorable, mainly because of the conversion of HF (pyrazine) and HF2- (the bifluoride ion) with a strong hydrogen bond effect from fluoride (F-) with pH < 3.18. The lattice plane of (0 0 2) belongs to the dominant face for removing fluoride in this structure. According to the experimental and theoretical calculation, strong bonding of Al, O and H sites with fluoride species (F-, HF, HF2-) in acidic solution are demonstrated, but not in alkaline solution due to OH- interference. The possible mechanism of fluoride adsorption on boehmite (AlOOH) structures is proposed. Our findings show a new potential prospect of structural designing for novel fluoride adsorbent.

中文翻译:

通过核壳勃姆石的设计去除不同种类氟化物的吸附机理。

已经开发出许多种用于从水中除去氟化物的吸附剂。然而,目前尚不清楚的氟化物吸附机理,极大地限制了新型吸附剂的结构设计和应用。基于对羟基与氟化物之间相互作用的理解,通过原位诱导去除氟化物的组装合成了勃姆石的新型核壳纳米结构。形成的多晶勃姆石(γ-AlOOH)纳米结构显着提高了吸附性能。氟化物形式(包括F-,HF,HF2-)的转化与溶液性质密切相关。酸性溶液更有利,主要是因为HF(吡嗪)和HF2-(二氟离子)的转化具有较强的氢键作用,而氟化物(F-)的pH <3.18。(0 0 2)的晶面属于该结构中用于除去氟化物的主面。根据实验和理论计算,证明了Al,O和H位点与酸性溶液中的氟化物(F-,HF,HF2-)牢固结合,但由于OH-干扰而在碱性溶液中未牢固结合。提出了氟吸附在勃姆石(AlOOH)结构上的可能机理。我们的发现显示了新型氟化物吸附剂结构设计的新潜在前景。提出了氟吸附在勃姆石(AlOOH)结构上的可能机理。我们的发现显示了新型氟化物吸附剂结构设计的新潜在前景。提出了氟吸附在勃姆石(AlOOH)结构上的可能机理。我们的发现显示了新型氟化物吸附剂结构设计的新潜在前景。
更新日期:2020-03-19
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