Iron Oxide with Different Crystal Phases (α- and γ-Fe2O3) in Electroanalysis and Ultrasensitive and Selective Detection of Lead(II): An Advancing Approach Using XPS and EXAFS,Analytical Chemistry

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Iron Oxide with Different Crystal Phases (α- and γ-Fe2O3) in Electroanalysis and Ultrasensitive and Selective Detection of Lead(II): An Advancing Approach Using XPS and EXAFS
Analytical Chemistry ( IF 6.7 ) Pub Date : 2015-12-18 00:00:00 , DOI: 10.1021/acs.analchem.5b03570
Shan-Shan Li _{1,

2} , Wen-Juan Li _{1,

2} , Tian-Jia Jiang _{1,

2} , Zhong-Gang Liu _{1,

2} , Xing Chen ₁ , Huai-Ping Cong ₂ , Jin-Huai Liu ₁ , Yu-Ying Huang ₃ , Li-Na Li ₃ , Xing-Jiu Huang _{1,

2}

Affiliation

Iron oxide with different crystal phases (α- and γ-Fe₂O₃) has been applied to electrode coatings and been demonstrated to ultrasensitive and selective electrochemical sensing toward heavy metal ions (e.g., Pb(II)). A range of Pb(II) contents in micromoles (0.1 to 1.0 μM) at α-Fe₂O₃ nanoflowers with a sensitivity of 137.23 μA μM^–1 cm^–2 and nanomoles (from 0.1 to 1.0 nM) at γ-Fe₂O₃ nanoflowers with a sensitivity of 197.82 μA nM^–1 cm^–2 have been investigated. Furthermore, an extended X-ray absorption fine structure (EXAFS) technique was applied to characterize the difference of local structural environment of the adsorbed Pb(II) on the surface of α- and γ-Fe₂O₃. The results first showed that α- and γ-Fe₂O₃ had diverse interaction between Pb(II) and iron (hydro)oxides, which were consistent with the difference of electrochemical performance. Determining the responses of Cu(II) and Hg(II) as the most appropriate choice for comparison, the stripping voltammetric quantification of Pb(II) with high sensitivity and selectivity at γ-Fe₂O₃ nanoflower has been demonstrated. This work reveals that the stripping performances of a nanomodifier have to be directly connected with its intrinsic surface atom arrangement.

中文翻译：

氧化铁不同晶相（α-和γ-的Fe ₂ ö ₃）在电分析和超灵敏和铅的选择性测定（II）：的前进方法使用XPS和EXAFS

氧化铁具有不同晶相（α-和γ-的Fe ₂ ö ₃）已被施加到电极的涂层和被证明朝向重金属离子超灵敏的和选择性的电化学感测（例如，铅（II））。铅的范围（II）在微摩尔（0.1至1.0μM）在内容的α-Fe ₂ ö ₃纳米花与137.23μAμM的灵敏度^-1厘米^-2在和纳摩尔（0.1至1.0 nM）的γ -铁₂ O ₃纳米花，灵敏度为197.82μAnM ^–1 cm ^–2已被调查。此外，一个扩展X射线吸收精细结构（EXAFS）技术应用于α-和γ-Fe的表面上表征的吸附的Pb（II）的局部结构环境的差异₂ Ó ₃。结果首先表明，α-和γ-的Fe ₂ ö ₃有铅（II）和铁（氢）氧化物，其用的电化学性能差异一致之间多样交互作用。确定的Cu（II）和Hg（II），作为最合适的选择的响应进行比较，具有高的灵敏度和选择性的Pb的溶出伏安量化（II）在γ-的Fe ₂ ö ₃纳米花已被证明。这项工作表明，纳米改性剂的剥离性能必须与其固有的表面原子排列直接相关。

更新日期：2015-12-18

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