A new sensor based on graphite carbon paste modified by an organic molecule for efficient determination of heavy metals in drinking water

Laghlimi, Charaf; Ziat, Younes; Moutcine, Abdelaziz; Hammi, Maryama; Zarhri, Zakaryaa; Ifguis, Ousama; Chtaini, Abdelilah

doi:10.1016/j.cdc.2020.100595

Cited by 17 publications

(9 citation statements)

References 97 publications

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“…(see Figure 5 e,f). Whereas, the linear relation reflects the adsorption of nitrite on electrode surfaces [ 68 , 69 ]. Additionally, reaction is considered to be controlled by mixed adsorption/desorption process.…”

Section: Resultsmentioning

confidence: 99%

Zinc Nanocomposite Supported Chitosan for Nitrite Sensing and Hydrogen Evolution Applications

et al. 2023

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Nanoparticles of ZnO-Chitosan (Zn-Chit) composite were prepared using precipitation methods. Several analytical techniques, such as scanning electron microscope (SEM), transmitted electron microscope (TEM), powder X-ray diffraction (XRD), infrared spectroscopy (IR), and thermal analysis, were used to characterize the prepared composite. The activity of the modified composite was investigated for nitrite sensing and hydrogen production applications using various electrochemical techniques. A comparative study was performed for pristine ZnO and ZnO loaded on chitosan. The modified Zn-Chit has a linear range of detection 1–150 µM and a limit of detection (LOD) = 0.402 µM (response time ~3 s). The activity of the modified electrode was investigated in a real sample (milk). Furthermore, the anti-interference capability of the surface was utilized in the presence of several inorganic salts and organic additives. Additionally, Zn-Chit composite was employed as an efficient catalyst for hydrogen production in an acidic medium. Thus, the electrode showed long-term stability toward fuel production and enhanced energy security. The electrode reached a current density of 50 mA cm−2 at an overpotential equal to −0.31 and −0.2 V (vs. RHE) for GC/ZnO and GC/Zn-Chit, respectively. Electrode durability was studied for long-time constant potential chronoamperometry for 5 h. The electrodes lost 8% and 9% of the initial current for GC/ZnO and GC/Zn-Chit, respectively.

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Section: Resultsmentioning

confidence: 99%

Zinc Nanocomposite Supported Chitosan for Nitrite Sensing and Hydrogen Evolution Applications

et al. 2023

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“…The proposed mechanism is represented as follows [ 31 ]: Organic matrix of the electrode Pb 2+ + 2e − ⟶ organic matrix of the electrode Pb Organic matrix of the electrode Pb ⟶ organic matrix of the electrode Pb 2+ + 2e − …”

Section: Resultsmentioning

confidence: 99%

“…The decrease in the intensity of the anodic peak in an electrolyte medium of pH 10 (basic medium) can be explained by the formation of lead hydroxide (Pb (OH) 2 ), which leads to a decrease in Pb (II) ions on the surface of the modified electrode. On the other hand, the increase in peak current at pH = 2 (acidic environment) can be explained by the presence of the ionic form of Pb(II) which is dominant compared to lead hydroxide (Pb (OH) 2 ) [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

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Biopolymer-Modified Carbon Paste Electrode for the Electrochemical Detection of Pb(II) in Water

Ifguis

Moutcine

Laghlimi

et al. 2022

Journal of Analytical Methods in Chemistry

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During the present study, biopolymer lignin was extracted, in particular, from sugar beet pulp (molasses) from the Tadla region (224 km from Marrakech, Morocco). The lignin was characterized by infrared spectroscopy (FTIR) and thermogravimetric TG/DTA analysis and then used as a modifier to enhance the electroanalytical detection of heavy metal ion traces. The performance of the lignin/CPE sensor to detect lead (II) was studied by cyclic voltammetry (CV) and square-wave voltammetry in 0.3 mol L−1 NaCl. With optimized experimental parameters, the lignin/CPE sensor developed has a minimum detection limit of 2.252.10−11 M for Pb (II). The proposed working electrode has been successfully applied for the coanalysis of Pb (II) in tap water with good results.

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“…The technique is simple, fast and inexpensive. The electrode was shown to be linear in the concentration range from 0.302 mmol/L to 1.812 mmol/L for Pb under optimal chemical and electrochemical conditions and the LOQ and LOD limits for Pb are 7.77 × 10 -9 mol/L and 2.33 × 10 -9 mol/L respectively [77].…”

Section: Simultaneous Determination Of Pb and Other Heavy Metalsmentioning

confidence: 98%

Novel Aspects in the Voltametric Determination of Heavy Metals: A Minireview

Chatziathanasiou,

Girousi

2024

Preprint

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Heavy metals represent a class of chemical elements that includes metalloids, bases and transition metals, lanthanides and actinides. They are distinguished for their toxicity in small concentrations and for their negative effects on the environment and human health. They are present in various samples, mainly in water, industrial waste and food. The determination of heavy metals is carried out mainly by analytical methods, using spectroscopy, spectrometry and electroanalysis, while studies are being carried out for the development of new and faster methodologies and techniques for their analysis, with particular emphasis on voltammetry. This review deals with the determination of heavy metals mainly in environmental samples (water) using voltammetry. In particular, the methods of their determination are evaluated in terms of sensitivity, selectivity and applicability.

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A new sensor based on graphite carbon paste modified by an organic molecule for efficient determination of heavy metals in drinking water

Cited by 17 publications

References 97 publications

Zinc Nanocomposite Supported Chitosan for Nitrite Sensing and Hydrogen Evolution Applications

Zinc Nanocomposite Supported Chitosan for Nitrite Sensing and Hydrogen Evolution Applications

Biopolymer-Modified Carbon Paste Electrode for the Electrochemical Detection of Pb(II) in Water

Novel Aspects in the Voltametric Determination of Heavy Metals: A Minireview

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