Thiol–ene chemistry guided preparation of thiolated polymeric nanocomposite for anodic stripping voltammetric analysis of Cd2+ and Pb2+

Zhaohong Su; Ying Liu; Yi Zhang; Qingji Xie; Li Chen; Yi Huang; Yingchun Fu; Yue Meng; Xuejiao Li; Ming Ma; Shouzhuo Yao

doi:10.1039/C2AN36114K

Thiol–ene chemistry guided preparation of thiolated polymeric nanocomposite for anodic stripping voltammetric analysis of Cd²⁺ and Pb²⁺†

Zhaohong Su,^ab Ying Liu,^a Yi Zhang,^a Qingji Xie,*^a Li Chen,^a Yi Huang,^a Yingchun Fu,^a Yue Meng,^a Xuejiao Li,^a Ming Ma^a and Shouzhuo Yao^a

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^a Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, PR China
E-mail: xieqj@hunnu.edu.cn
Fax: +86 731 88865515
Tel: +86 731 88865515

^b College of Science, Hunan Agricultural University, Changsha 410128, PR China

Abstract

We report on the thiol–ene chemistry guided preparation of a novel thiolated polymeric nanocomposite involving polyaniline (PANI), a functionalized thiol, e.g., sulfur-rich 2,5-dimercapto-1,3,4-thiadiazole (DMcT), and multiwalled carbon nanotubes (MWCNTs) for the sensitive differential pulse anodic stripping voltammetric determination of Cd²⁺ and Pb²⁺ on a glassy carbon electrode (GCE). Briefly, the thiol–ene reaction of a thiol with oxidized PANI that was chemically synthesized in the presence of solution-dispersed acidified MWCNTs yielded a thiolated polymeric nanocomposite of thiol-PANI/MWCNTs. The thiols examined include DMcT, 1,6-hexanedithiol and β-mercaptoethanol. Quartz crystal microbalance, cyclic voltammetry, scanning electron microscopy, Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy were used for film characterization and process monitoring. Under the optimized conditions, the obtained Bi/Nafion/DMcT–PANI/MWCNTs/GCE can sensitively sense Cd²⁺ and Pb²⁺ with limits of detection of 0.01 and 0.04 μg L⁻¹, respectively.

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Thiol–ene chemistry guided preparation of thiolated polymeric nanocomposite for anodic stripping voltammetric analysis of Cd²⁺ and Pb²⁺†

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Thiol–ene chemistry guided preparation of thiolated polymeric nanocomposite for anodic stripping voltammetric analysis of Cd²⁺ and Pb²⁺

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