Abstract
Au nanoparticles decorated mesoporous MnFe2O4 nanocrystal clusters (MnFe2O4/Au hybrid nanospheres) were used for the electrochemical sensing of As(III) by square wave anodic stripping voltammetry (SWASV). Modified on a cheap glass carbon electrode, these MnFe2O4/Au hybrid nanospheres show favorable sensitivity (0.315 μA/ppb) and limit of detection (LOD) (3.37 ppb) toward As(III) under the optimized conditions in 0.1 M NaAc-HAc (pH 5.0) by depositing for 150 s at the deposition potential of −0.9 V. No obvious interference from Cd(II) and Hg(II) was recognized during the detection of As(III). Additionally, the developed electrode displayed good reproducibility, stability, and repeatability, and offered potential practical applicability for electrochemical detection of As(III) in real water samples. The present work provides a potential method for the design of new and cheap sensors in the application of electrochemical determination toward trace As(III) and other toxic metal ions.
Highlights
Inorganic arsenic contamination in drinking water has become a serious worldwide threat to human health due to arsenic’s high toxicity [1]
In this work, considering the high electrochemical response of Mn doped iron oxide and the excellent electrocatalytical ability of Au nanoparticles towards As(III), we have explored Au nanoparticle decorated mesoporous MnFe2 O4 nanocrystal clusters (MnFe2 O4 /Au hybrid nanospheres) for electrochemical sensing of As(III) by square wave anodic stripping voltammetry (SWASV) [26,27]
The HRTEM image indicates that the individual microsphere contains lots of loose clusters, which are composed of primary nanocrystals with the size of about 8–12 nm (Figure 1b)
Summary
Inorganic arsenic contamination in drinking water has become a serious worldwide threat to human health due to arsenic’s high toxicity [1]. Such pollutants in drinking water may lead to many health problems, such as skin lesions, keratosis, lung cancer, and bladder cancer [2]. It is rather important to have an accurate, rapid, and sensitive method to detect and monitor the environmental pollution of drinking water. Electrochemical methods, stripping voltammetry analysis, have provided promising techniques that are available for the sensitive detection and quantification of arsenic due to their low cost, portability, and suitability for on-site analysis [7,8,9]
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