Metal Replacement Causing Interference in Stripping Analysis of Multiple Heavy Metal Analytes: Kinetic Study on Cd(II) and Cu(II) Electroanalysis via Experiment and Simulation

Lin, Chin E.; Li, Pei‐Hua; Yang, Meng; Ye, Jia-Jia; Huang, Xing‐Jiu

doi:10.1021/acs.analchem.9b01724

Cited by 54 publications

(17 citation statements)

References 23 publications

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“…A slight shift of the stripping peak potential is observed when the concentration of As(III) changes, which is attributed to the interaction between adjacent deposited arsenic atoms. 26 The sensitivity of Co SAC for As(III) was 11.44 μA ppb −1 and the theoretical limit of detection (LOD) was 0.02 ppb (3σ method). For comparison, Co NPs, N−C, and bare SPCE were adopted for the electroanalysis of As(III).…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…The current signals of As(III) were present at approximately 0.05 V and the current peak increased with As(III) concentration. A slight shift of the stripping peak potential is observed when the concentration of As(III) changes, which is attributed to the interaction between adjacent deposited arsenic atoms . The sensitivity of Co SAC for As(III) was 11.44 μA ppb –1 and the theoretical limit of detection (LOD) was 0.02 ppb (3σ method).…”

Section: Resultsmentioning

confidence: 99%

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Ultra-Sensitive and Selective Detection of Arsenic(III) via Electroanalysis over Cobalt Single-Atom Catalysts

Yang

et al. 2020

Anal. Chem.

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Achieving highly sensitive and selective detection of trace-level As(III) and clarifying the underlying mechanism is still a intractable problem. The electroanalysis of As(III) relies on the electrocatalytic ability of the sensing interface. Herein, we first adopt single-atom catalysts as the electrocatalyst in As(III) detection. Cobalt single-atoms anchored on nitrogen-doped carbon material (Co SAC) were found to have an extraordinary sensitivity of 11.44 μA ppb–1 with excellent stability and repeatability, which so far is the highest among non-noble metal nanomaterials. Co SAC also exhibited a superior selectivity toward As(III) compared with some bivalent heavy metal ions (HMIs). Combining X-ray absorption spectroscopy (XAFS), density functional theory (DFT) calculation, and reaction kinetics simulation, we demonstrated that Co single atoms stabilized in N2C2 support serve as active sites to catalyze H3AsO3 reduction via the formation of Co–O hybridization bond, leading to a lower energy barrier, promoting the breakage of As–O bonds. Importantly, the first electron transfer is the rate-limiting step of arsenic reduction and is found to be more favorable on Co-SAC both thermodynamically and kinetically. This work not only expands the potential applicaiton of single-atom catalysts in the detection and treatment of As(III), but also provides atomic-level catalytic insights into HMIs sensing interfaces.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Ultra-Sensitive and Selective Detection of Arsenic(III) via Electroanalysis over Cobalt Single-Atom Catalysts

Yang

et al. 2020

Anal. Chem.

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“…Managing these risks requires the construction of multifunctional adsorptive/sensing platforms for the simultaneous assessment of the exposure to and remediation of heavy metals . Various adsorbents have been reported for the efficient removal of heavy metals from water, , and their affinities further benefit the sensitive electroanalysis of heavy metals. , However, the adsorptive selectivity of these adsorbents for contaminant removal − and quantified analysis , is yet to be realized. Layered materials have great potential to capture metal ions and show much structural superiority over their bulk counterparts, owing to their open accessible sites. − The unique cation exchange capacities, based on the soft Lewis acid–base interactions, , offer an efficient way to separate heavy metals from the coexisting hard ions (such as H(I), Na(I), and Ca(II)).…”

Section: Introductionmentioning

confidence: 99%

“…1 Various adsorbents have been reported for the efficient removal of heavy metals from water, 2,3 and their affinities further benefit the sensitive electroanalysis of heavy metals. 4,5 However, the adsorptive selectivity of these adsorbents for contaminant removal 6−9 and quantified analysis 5,10 is yet to be realized. Layered materials have great potential to capture metal ions and show much structural superiority over their bulk counterparts, owing to their open accessible sites.…”

Section: ■ Introductionmentioning

confidence: 99%

Fe–Mn Oxides Based Multifunctional Adsorptive/Electrosensing Nanoplatforms: Dynamic Site Rearrangement for Metal Ion Selectivity

Ruan

2021

Environ. Sci. Technol.

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Achieving structural requirements for the exclusive selectivity of adsorbent to a specific metal remains challenging, as certain metal ions show similar adsorptive behaviors and preference toward a given site. We reported the morphology and oxidation state-dependent selectivity manipulating of layered oxides by controlling the dynamic evolution of different adsorptive sites. The computational investigation predicted the site-specific partitioning trends of metal ions at two sites of manganese oxide (MnO2) layers: the lateral edge sites (LESs) and octahedral vacancy sites (OVSs). In contrast to the predominant occupation of the OVSs for other metal ions, the binding of lead (Pb) ions was energetically favored at both the sites. We assembled ultrathin MnO2 nanosheets on the magnetic iron oxides to first enhance the accessibility of the LESs. A sequential ligand-promoted partial reduction of the atomic MnO2 layers induced the edge-to-interlayer migration of Mn atoms to block the nonspecific OVSs and activate the LESs, enabling a superior selectivity to Pb. In addition, the iron oxides helped construct a multifunctional adsorptive/electrosensing platform for Pb regarding their facile magnetic separation and electrochemical activity. Simultaneous selective adsorption and on-site monitoring of Pb(II) were achieved on this nanoplatform, owing to its satisfactory stability and sensitivity without an obvious matrix effect.

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“…At present, some analytical methods based on portable detectors, e.g., anodic stripping voltammetry (ASV), and colorimetry, can be used to detect trace heavy metals in the field, but they are not inherently suitable for the detection of heavy metals in complex real water samples due to the interference of unknown coexisting metal ions . X-ray fluorescence (XRF) and laser-induced breakdown spectroscopy (LIBS) present elemental characteristics in direct sampling analysis.…”

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confidence: 99%

“Insert-and-Go” Activated Carbon Electrode Tip for Heavy Metal Capture and In Situ Analysis by Microplasma Optical Emission Spectrometry

Liu

Xue

2021

Anal. Chem.

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The miniaturized optical emission spectrometry (OES) devices based on various microplasma excitation sources provide reliable tools for on-site analysis of heavy metal pollution, while the development of convenient and efficient sample introduction approaches is essential to improve their performances for field analysis. Herein, a small activated carbon electrode tip is employed as solid support to preconcentrate heavy metals in water and subsequently served as an inner electrode of the coaxial dielectric barrier discharge (DBD) to generate microplasma. In this case, heavy metal analytes in water are first adsorbed on the surface of the activated carbon electrode tip via a simple liquid–solid phase transformation during the sample loading process, and then, fast released to produce OES during the DBD microplasma excitation process. The corresponding OES signals are synchronously recorded by a charge-coupled device (CCD) spectrometer for quantitative analysis. This activated carbon electrode tip provides a new tool for sample introduction into the DBD microplasma and facilitates “insert-and-go” in subsequent DBD-OES analysis. With a multiplexed activated carbon electrode tip array, a batch of water samples (50 mL) can be loaded in parallel within 5 min. After drying the activated carbon electrode tips for 5 min, the DBD-OES analysis is maintained at a rate of 6 s per sample. Under the optimized conditions, the detection limits of 0.03 and 0.6 μg L–1 are obtained for Cd and Pb, respectively. The accuracy and practicability of the present DBD-OES system have been verified by measuring several certified reference materials and real water samples. This analytical strategy not only simplifies the sample pretreatment steps but also significantly improves the sensitivity of the DBD-OES system for heavy metal detection. By virtue of the advantages of high sensitivity, fast analysis speed, simple operation, low cost, and favorable portability, the upgraded DBD-OES system provides a more powerful tool for on-site analysis of heavy metal pollution.

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Metal Replacement Causing Interference in Stripping Analysis of Multiple Heavy Metal Analytes: Kinetic Study on Cd(II) and Cu(II) Electroanalysis via Experiment and Simulation

Cited by 54 publications

References 23 publications

Ultra-Sensitive and Selective Detection of Arsenic(III) via Electroanalysis over Cobalt Single-Atom Catalysts

Ultra-Sensitive and Selective Detection of Arsenic(III) via Electroanalysis over Cobalt Single-Atom Catalysts

Fe–Mn Oxides Based Multifunctional Adsorptive/Electrosensing Nanoplatforms: Dynamic Site Rearrangement for Metal Ion Selectivity

“Insert-and-Go” Activated Carbon Electrode Tip for Heavy Metal Capture and In Situ Analysis by Microplasma Optical Emission Spectrometry

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