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High Electrochemical Sensitivity of TiO2–x Nanosheets and an Electron-Induced Mutual Interference Effect toward Heavy Metal Ions Demonstrated Using X-ray Absorption Fine Structure Spectra
Analytical Chemistry ( IF 7.4 ) Pub Date : 2018-03-15 00:00:00 , DOI: 10.1021/acs.analchem.7b02315
Wen-Yi Zhou 1, 2 , Shan-Shan Li 1, 2 , Jie-Yao Song 2 , Min Jiang 1, 2 , Tian-Jia Jiang 1, 2 , Jin-Yun Liu 1, 2 , Jin-Huai Liu 1, 2 , Xing-Jiu Huang 1, 2
Affiliation  

Mutual interference is a severe issue that occurs during the electrochemical detection of heavy metal ions. This limitation presents a notable drawback for its high sensitivity to specific targets. Here, we present a high electrochemical sensitivity of ∼237.1 μA cm–2 μM–1 toward copper(II) [Cu(II)] based on oxygen-deficient titanium dioxide (TiO2–x) nanosheets. We fully demonstrated an atomic-level relationship between electrochemical behaviors and the key factors, including the high-energy (001) facet percentage, oxygen vacancy concentration, surface −OH content, and charge carrier density, is fully demonstrated. These four factors were quantified using Raman, electron spin resonance, X-ray photoelectron spectroscopy spectra, and Mott–Schottky plots. In the mutual interference investigation, we selected cadmium(II) [Cd(II)] as the target ion because of the significant difference in its stripping potential (∼700 mV). The results show that the Cd(II) can enhance the sensitivity of TiO2–x nanosheets toward Cu(II), exhibiting an electron-induced mutual interference effect, as demonstrated by X-ray absorption fine structure spectra.

中文翻译:

TiO 2– x纳米片材的高电化学敏感性和电子诱导的对重金属离子的相互干扰效应(通过X射线吸收精细结构光谱证明)

相互干扰是在重金属离子的电化学检测过程中发生的严重问题。该限制因其对特定目标的高灵敏度而存在明显的缺陷。这里,我们提出~237.1μAcm的高电化学灵敏度-2 μM -1朝向铜(II)[铜(II)]基于氧不足型的二氧化钛(TiO 2- X)纳米片。我们充分证明了电化学行为与关键因素之间的原子级关系,包括高能(001)晶面百分比,氧空位浓度,表面-OH含量和电荷载流子密度,这些都得到了充分证明。使用拉曼光谱,电子自旋共振,X射线光电子能谱和莫特-肖特基图对这四个因素进行了量化。在相互干扰研究中,我们选择镉(II)[Cd(II)]作为目标离子,因为其剥离电位(〜700 mV)存在显着差异。结果表明,Cd(II)可以增强TiO 2– x纳米片对Cu(II)的敏感性,表现出电子诱导的互干扰效应,这由X射线吸收精细结构光谱证明。
更新日期:2018-03-15
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