Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (2): 287-295.DOI: 10.1016/S1872-2067(16)62582-2

• Article • Previous Articles     Next Articles

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

Xin Zhou, Jing Zou, Sheng Zhang, Ming Pan, Wanyun Gong   

  1. 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:2016-09-29 Revised:2016-10-24 Online:2017-02-18 Published:2017-03-14
  • Contact: 10.1016/S1872-2067(16)62582-2
  • Supported by:

    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).

Abstract:

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.

Key words: Graphitic carbon nitride, Zinc sulfide, DNA, Nanocomposite, Electrocatalytic activity, Environmental hormones