Three-dimensional tree-like branched TiO2 nanorods for the highly selective enrichment and determination of lead
Three-dimensional tree-like branched TiO2 nanorods for the highly selective enrichment and determination of lead
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DOI：
10.1007/s00604-022-05315-4
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发表时间：
2022-05
影响因子：
5.7
通讯作者：
Yu-Zhu Ding;Jing-yan Kang;Yi-Da Zhang;Wei Ha;Yan-Ping Shi
中科院分区：
文献类型：
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作者：
Yu-Zhu Ding;Jing-yan Kang;Yi-Da Zhang;Wei Ha;Yan-Ping Shi
以掺氟氧化锡玻璃（FTO）为载体，制备了枝状二氧化钛纳米棒（B-TiO 2 NRs），并将其作为固相萃取剂用于铅（II）的预富集和电感耦合等离子体发射光谱（ICP-OES）测定。B-TiO 2 NR基玻璃基板对Pb（II）表现出优异的吸附选择性和容量;在pH = 5.0时，最大吸附容量为168.4 mg·g-1 PB（II）。结果表明，萃取机理主要是通过软酸碱相互作用形成络合物进行化学吸附。吸附动力学和吸附等温线的研究表明，Pb（II）在B-TiO 2 NR上的吸附符合准二级动力学模型和Langmuir模型。在最佳条件下，Pb（II）的线性范围为0.01 ~ 5 mg·L-1，相关系数（R2）为0.9989，检出限（LOD）为2.2 μg·L-1。方法用于食品中Pb（II）的测定，回收率为93.18 ~ 108.1%，精密度RSD小于12.2%。本工作为复杂基体样品中Pb（II）的选择性萃取和测定提供了一种新的方法。
Branched titanium dioxide nanorods (B-TiO2NRs) grown on fluorine-doped tin oxide glass (FTO) were developed, which can be used as a solid-phase extractant for preconcentration and determination of trace Pb(II) combined with inductively coupled plasma optical emission spectrometry (ICP-OES). The B-TiO2NR-based glass substrate displayed excellent adsorptive selectivity and capacity for Pb(II); the maximum adsorption capacity was found to be 168.4 mg⋅g−1PB(II) at pH = 5.0. It proved that the primary extraction mechanism was attributed to soft acid/soft base interactions to form complexes for chemisorption. Investigating the adsorption kinetics and isotherms indicated that the pseudo-second-order and Langmuir models can better describe Pb(II) adsorption on the B-TiO2NRs. The proposed method presented good linearity from 0.01 to 5 mg⋅L−1with a correlation coefficient (R2) of 0.9989 and a low limit of detection (LOD) of 2.2 μg⋅L−1for Pb(II) under optimal conditions. The method was successfully applied to Pb(II) determination in foodstuffs with desirable recoveries from 93.18 to 108.1% and good precision with an RSD of less than 12.2%. This work provides a new strategy for selective extraction and determination of Pb(II) in complicated matrix samples.Graphical abstract