One-dimensional zirconium-doped titanate nanostructures for rapid and capacitive removal of multiple heavy metal ions from water†,Dalton Transactions

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One-dimensional zirconium-doped titanate nanostructures for rapid and capacitive removal of multiple heavy metal ions from water†
Dalton Transactions ( IF 3.5 ) Pub Date : 2018-02-27 00:00:00 , DOI: 10.1039/c8dt00405f
Chen Zou _{1,

2,

3,

4} , Xiaojuan Zhao _{1,

2,

3,

4} , Yan Xu _{1,

2,

3,

4}

Affiliation

We report a novel, one-dimensional zirconium-doped layered trititanate with a porous core and a textured surface of ultrafine nanofibers (∼5 nm) by the hydrothermal alkaline treatment of electrospun fibers. It demonstrates superior efficiency for rapid, capacitive and simultaneous removal of multiple heavy metal ions such as Pb²⁺, Cd²⁺, Cu²⁺ and Zn²⁺. The adsorption is exceptionally rapid, showing 100% removal of Cu²⁺ in 10 min, and 100% removal of Pb²⁺ and Cd²⁺ in 20 min in water with a wide range of concentrations from 0.1 to 5 mmol L⁻¹. It displays an extraordinary adsorption capacity for highly toxic Pb²⁺ (2.91 mmol g⁻¹). The sorption isotherms for Pb²⁺, Cd²⁺, Cu²⁺ and Sr²⁺ agree with the Langmuir model, indicating a monolayer adsorption. Corresponding sorption kinetics follow a pseudo-second-order model, suggesting a chemisorption-controlled adsorption process operating under the soft–hard Lewis acid–base principle. The crystal structure of the layered structure is retained after the ion-exchange process, endowing it with promising potential for the remediation of heavy metal contaminated water.

中文翻译：

一维锆掺杂钛酸酯纳米结构，可从水中快速电容去除多种重金属离子†

我们报告了一种新型的一维锆掺杂层状三钛酸酯，其具有多孔芯和超细纳米纤维（〜5 nm）的织纹表面，通过电纺纤维的水热碱处理。它显示出卓越的效率，可快速，电容式和同时去除多种重金属离子，例如Pb 2 ⁺，Cd 2 ⁺，Cu ²⁺和Zn ²⁺。吸附异常迅速，在浓度范围从0.1到5 mmol L ^-1的水中，在10分钟内100％除去Cu ^2+，在20分钟内100％除去Pb ²⁺和Cd ²⁺。对高毒性的Pb ²⁺具有非凡的吸附能力（2.91mmol g ^-1）。Pb 2 ⁺，Cd 2 ⁺，Cu ²⁺和Sr ²⁺的吸附等温线与Langmuir模型一致，表明是单层吸附。相应的吸附动力学遵循伪二级模型，表明化学吸附控制的吸附过程在软硬路易斯酸碱原理下进行。在离子交换过程之后，层状结构的晶体结构得以保留，赋予了其有望修复重金属污染水的潜力。

更新日期：2018-02-27

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