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Capacitive Removal of Fluoride Ions via Creating Multiple Capture Sites in a Modulatory Heterostructure
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-08-24 , DOI: 10.1021/acs.est.1c03228
Guizhi Wang 1 , Tingting Yan 1 , Junjie Shen 2 , Jianping Zhang 1 , Dengsong Zhang 1
Affiliation  

Fluoride pollution has become a major concern because of its adverse effects on human health. However, the removal capacity of defluorination agents in traditional methods is far from satisfactory. Herein, capacitive removal of F ions via creating multiple capture sites in a modulatory heterostructure has been originally demonstrated. The heterostructure of uniformly dispersed Al2O3 coating on hollow porous nitrogen-doped carbon frameworks was precisely synthesized by atomic layer deposition. An exceptional F ion removal efficiency at 1.2 V (95.8 and 92.9% in 5 and 10 mg/L F solutions, respectively) could be finally achieved, with a good regeneration ability after 20 consecutive defluorination cycles. Furthermore, we investigated the removal mechanisms of F ions by in situ Raman, in situ X-ray diffraction, and ex situ X-ray photoelectron spectroscopy measurements. The promotional removal capacity was realized by the multiple capture sites of the reversible conversion of Al–F species and the insertion of F ions into the carbon skeleton. This work offers an important new pathway and deep understanding for efficient removal of F ions from wastewater.

中文翻译:

通过在调制异质结构中创建多个捕获位点来电容去除氟离子

氟化物污染已成为一个主要问题,因为它对人类健康有不利影响。然而,传统方法对脱氟剂的去除能力差强人意。在此,最初证明了通过在调制异质结构中创建多个捕获位点来电容去除 F -离子。通过原子层沉积精确合成了在空心多孔氮掺杂碳骨架上均匀分散的Al 2 O 3涂层的异质结构。在 1.2 V 时具有出色的 F 离子去除效率(5 和 10 mg/LF – 为95.8% 和 92.9% 溶液)最终可以实现,在连续 20 次脱氟循环后具有良好的再生能力。此外,我们通过原位拉曼、原位 X 射线衍射和异位 X 射线光电子能谱测量研究了 F -离子的去除机制。促进去除能力是通过 Al-F 物种的可逆转化和 F -离子插入碳骨架的多个捕获位点实现的。这项工作为有效去除废水中的 F -离子提供了重要的新途径和深刻理解。
更新日期:2021-09-07
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