Citation: Xin Zhou, Jing Zou, Sheng Zhang, Ming Pan, Wanyun Gong. Preparation and application of g-C₃N₄-ZnS-DNA nanocomposite with enhanced electrocatalytic activity[J]. Chinese Journal of Catalysis, ;2017, 38(2): 287-295. doi: 10.1016/S1872-2067(16)62582-2 shu

Preparation and application of g-C₃N₄-ZnS-DNA nanocomposite with enhanced electrocatalytic activity

School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430205, Hubei, China

Received Date: 29 September 2016
Revised Date: 24 October 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21471122) and Graduate Student Education Innovation Fundation and President Foundation of Wuhan Institute of Technology (CX2015147, 2016062).

We successfully designed and prepared a g-C₃N₄-ZnS-DNA nanocomposite by a simple method and systematically investigated its morphology, microstructure, and electrocatalytic properties. The as-prepared g-C₃N₄-ZnS-DNA nanocomposite possessed the electrocatalytic activity of g-C₃N₄-ZnS and the conductivity of DNA. The presence of DNA was found to enhance the electrocatalytic response of the nanocomposite towards environmental hormones, e.g. pentachlorophenol and nonylphenol, owing to the interaction between g-C₃N₄-ZnS and DNA, indicating that a stable nanocomposite was formed. The three components showed synergistic effects during electrocatalysis. Electrochemical impedance spectra indicated that the g-C₃N₄-ZnS-DNA nanocomposite dramatically facilitated the electron transfer of a modified electrode. The co-doping of g-C₃N₄ film with ZnS and DNA doubled the electrochemical response of the modified electrode in comparison with that of unmodified g-C₃N₄ film. The detection limits (3 S/N) of pentachlorophenol and nonylphenol were 3.3×10^-9 mol L^-1. Meanwhile, we propose a possible Z-scheme mechanism for electron transfer in the g-C₃N₄-ZnS-DNA nanocomposite and the possible pentachlorophenol and nonylphenol electrocatalytic oxidation mechanism. The g-C₃N₄-ZnS-DNA nanocomposite-modified electrode was demonstrated to be effective for electrochemical sensing of trace environmental hormones in water samples.
- Graphitic carbon nitride,
- Zinc sulfide,
- DNA,
- Nanocomposite,
- Electrocatalytic activity,
- Environmental hormones
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Preparation and application of g-C₃N₄-ZnS-DNA nanocomposite with enhanced electrocatalytic activity