Rational design of high visible light-harvesting photoelectrode for simultaneous detection of enrofloxacin residue markers with a dual-channel cathodic photoelectrochemical aptasensing approach
It is imperative to develop convenient methodology to enable the simultaneous detection of enrofloxacin (ENR) residue markers coexisted in the aquatic environment. To this end, an efficient dual-channel photoelectrochemical (PEC) aptasensing approach is presented for the detection of trace ENR residue markers simultaneously through a single signal acquisition. Primarily, cathodic PEC aptasensing platform with superior anti-interference capability and high sensitivity was designed and constructed on the basis of the high visible light-harvesting CuInS 2 photocathode and Bi 2 S 3 /C 3 N 4 photoanode; and the simultaneous detection of ENR residue markers was then realized by the spatial resolution of aptasensing interfaces. Additionally, systematic verification was performed to investigate the signal modulation mechanism and thermodynamic feasibility of the constructed PEC system, as well as the sensing signals acquired simultaneously endowed by the dual-channel mode. Under the optimal conditions, the developing aptasensing method had a wide linear range for the detection of ENR (0.1 nM–1 μM) and ciprofloxacin (CIP) (50 pM–0.5 μM) with detection limits of 24 pM and 15.5 pM, respectively. High degree of accuracy in the simultaneous detection of ENR residue markers in real water sample was also achieved, which presents a streamlined idea for the simultaneous detection of multiple contaminants in complex samples with a simple approach. Graphical abstract
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