Potential‐Dependent, Switchable Ion Selectivity in Aqueous Media Using Titanium Disulfide,ChemSusChem

当前位置： X-MOL 学术 › ChemSusChem › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Potential‐Dependent, Switchable Ion Selectivity in Aqueous Media Using Titanium Disulfide
ChemSusChem ( IF 7.5 ) Pub Date : 2018-06-19 , DOI: 10.1002/cssc.201800452
Pattarachai Srimuk _{1,

2} , Juhan Lee _{1,

2} , Simon Fleischmann _{1,

2} , Mesut Aslan ₁ , Choonsoo Kim ₁ , Volker Presser _{1,

2}

Affiliation

The selective removal of ions by an electrochemical process is a promising approach to enable various water‐treatment applications such as water softening or heavy‐metal removal. Ion intercalation materials have been investigated for their intrinsic ability to prefer one specific ion over others, showing a preference for (small) monovalent ions over multivalent species. In this work, we present a fundamentally different approach: tunable ion selectivity not by modifying the electrode material, but by changing the operational voltage. We used titanium disulfide, which shows distinctly different potentials for the intercalation of different cations and formed binder‐free composite electrodes with carbon nanotubes. Capitalizing on this potential difference, we demonstrated controllable cation selectivity by online monitoring the effluent stream during electrochemical operation by inductively coupled plasma optical emission spectrometry of aqueous 50 mm CsCl and MgCl₂. We obtained a molar selectivity of Mg²⁺ over Cs⁺ of 31 (strong Mg preference) in the potential range between −396 mV and −220 mV versus Ag/AgCl. By adjusting the operational potential window from −219 mV to +26 mV versus Ag/AgCl, Cs⁺ was preferred over Mg²⁺ by 1.7 times (Cs preference).

中文翻译：

使用二硫化钛在水介质中依赖于电位的可切换离子选择性

通过电化学方法选择性去除离子是实现各种水处理应用（如水软化或重金属去除）的一种有前途的方法。已经研究了离子插层材料的内在能力，他们倾向于一种特定的离子而不是其他特定的离子，这表明其对（小）单价离子的偏好高于多价物质。在这项工作中，我们提出了一种根本不同的方法：不是通过修改电极材料而是通过更改工作电压来实现可调节的离子选择性。我们使用了二硫化钛，该二硫化钛显示出嵌入不同阳离子的明显不同的电势，并与碳纳米管形成了无粘合剂的复合电极。利用这一潜在差异，m CsCl和MgCl ₂。我们在相对于Ag / AgCl的-396 mV和-220 mV的电位范围内获得了Mg ²⁺在Cs ⁺上的摩尔选择性为31（强烈的Mg偏爱）。通过将相对于Ag / AgCl的工作电势窗口从-219 mV调整到+26 mV，Cs ⁺比Mg ²⁺优选1.7倍（Cs偏爱）。

更新日期：2018-06-19

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11