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
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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.
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