A sensitive and environmentally friendly method for determination of chemical oxygen demand using NiCu alloy electrode

Zhou, Yusun; Ji, Tao; Hao, Qiaolin; Zhou, Yikai; Mei, Surong

doi:10.1016/j.electacta.2012.04.048

Cited by 39 publications

(28 citation statements)

References 25 publications

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“…The participation of Cu(III) species as an electron transfer mediator has been suggested to explain the performance of Cu particles in anodic process related to several organic compounds. 16 Cu(III) is central in the electrocatalytic oxidation of organic compounds in alkaline media.…”

Section: Electrochemical Behavior Of Copper Electrodementioning

confidence: 99%

“…A number of novel electrode materials have been reported for the electrochemical detection of COD, such as copper electrode modified with copper nanoparticles, Cu-cable and Cu-disk electrode modified with Cu nanoparticle, an activated copper electrode, CuO/Cu nanowire and NiCu alloy electrode. [15][16][17][18] The deposition process of metallic nanoparticles on foreign substrates has attracted great attention due to the different properties of nanoparticles compared to those materials. [19][20][21] Nanoparticles were reported to improve the surface roughness, provide an increase of conductive area, which corresponds to an improvement in sensitivity, and also enhance electrocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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Nano-Cu Modified Cu and Nano-Cu Modified Graphite Electrodes for Chemical Oxygen Demand Sensors

et al. 2020

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Nano-Cu modified Cu (nano-Cu/Cu) and nano-Cu modified graphite (nano-Cu/C) electrodes were prepared by depositing a thin layer of copper nanoparticles on a Cu wire or graphite electrode. Chronoamperometric and cyclic voltammetry techniques were applied to deposit the nanoparticles. The effects of Cu 2+ concentration, deposition time, number of scan cycles, and scan rate were studied to determine the optimum conditions of the experiment. The applications of both electrodes in the COD analysis were performed using glucose and glycine as the models. The voltammetry of a mixture solution of glucose (mg/L) and glycine (mg/L) in 0.075 M NaOH solution showed an oxidation peak at +0.68 V vs. Ag/AgCl. Good stability of this peak current was shown with relative standard deviations lower than 3% for 10 measurements. Amperometric determination of COD at this potential showed excellent linearities at both nano-Cu/Cu and nano-Cu/C electrodes (R 2 = 0.997) as well as good precision and accuracy with estimated detection limits of around ∼9 mgO/L for both the developed electrodes. Validation using the conventional COD measurements showed that the measurements achieved the average values of 92.58 and 87.86%, respectively, for nano-Cu/Cu and nano-Cu/C electrodes. Furthermore, comparison with the theoretical COD value achieved 94.90 and 89.87%, respectively, for nano-Cu/Cu and nano-Cu/C electrodes. The results indicated that both electrodes are suitable for practical application in COD determination.

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Section: Electrochemical Behavior Of Copper Electrodementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nano-Cu Modified Cu and Nano-Cu Modified Graphite Electrodes for Chemical Oxygen Demand Sensors

et al. 2020

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“…29 The NiCu alloy film was applied to modify the surface of a glassy carbon electrode which led to a very stable detecting element. The surface morphology of NiCu alloy was investigated by atomic force microscopy which confirmed its continuity and uniform thickness over the entire electrode.…”

Section: Nickel-copper Alloy Electrodementioning

confidence: 99%

Chemical Oxygen Demand

Latif

Dickert

2014

Nanostructure Science and Technology

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“…So far, number of novel electrode materials have been utilized to oxidize organic compounds. For instance, the following electrodes were reported for the electrochemical detection of COD: copper electrode modified with copper nanoparticles ; activated copper electrode ; glassy carbon electrode (GCE) coated with Ni nanoparticles , (NiCu) alloy , or cobalt oxide film ; boron‐doped diamond electrode (BDD) ; Pt electrodes modified with PbO 2 , or F‐PbO 2 ; Ti electrodes coated with nano‐TiO 2 , Rh 2 O 3 , or TiO 2 /PbO 2 ; carbon nanotube‐polystyrene composite electrode containing CuO/AgO ; gold electrode coated with micro‐nano structured Cu−Co film .…”

Section: Introductionmentioning

confidence: 99%

Sensitive and Green Method for Determination of Chemical Oxygen Demand Using a Nano‐copper Based Electrochemical Sensor

et al. 2017

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Copper nanoparticles (nano‐Cu) were electrodeposited on the surface of glassy carbon electrode (GCE) potentiostatically at −0.6 V vs. Ag/AgCl for 60 s. The developed nano‐copper modified glassy carbon electrode (nano‐Cu/GCE) was optimized and utilized for electrochemical assay of chemical oxygen demand (COD) using glycine as a standard. The surface morphology and chemical composition of nano‐Cu/GCE were investigated using scanning electron microscope (SEM) and energy dispersive X‐ray spectrometer (EDX), respectively. The electrochemical behavior was investigated using linear sweep voltammetry (LSV) which is characterized by a remarkable anodic peak at ∼0.6 V, compared to bare GCE. This indicates that nano‐Cu enhances significantly the electrochemical oxidation of glycine. The effect of different deposition parameters, such as Cu2+ concentration, deposition potential, deposition time, pH, and scan rate on the response of the developed sensor were investigated. The optimized nano‐Cu/GCE based COD sensor exhibited a linear range of 15 to 629.3 ppm, and a lower limit of detection (LOD) of 1.7 ppm (S/N=3). This developed method exhibited high tolerance level to chloride ion (0.35 M chloride ion has minimal influence). The analytical utility of the prepared COD sensor was demonstrated by investigating the COD recovery (99.8±4.3) and the assay of COD in different water samples. The results obtained were verified using the standard dichromate method.

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A sensitive and environmentally friendly method for determination of chemical oxygen demand using NiCu alloy electrode

Cited by 39 publications

References 25 publications

Nano-Cu Modified Cu and Nano-Cu Modified Graphite Electrodes for Chemical Oxygen Demand Sensors

Nano-Cu Modified Cu and Nano-Cu Modified Graphite Electrodes for Chemical Oxygen Demand Sensors

Chemical Oxygen Demand

Sensitive and Green Method for Determination of Chemical Oxygen Demand Using a Nano‐copper Based Electrochemical Sensor

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