Use of carbon paste electrodes as a novel strategy to study adsorption mechanism of silver ions onto functionalized grapefruit peel

Romero-Cano, Luis A.; García-Rosero, Helena; Olmo‐Iruela, Monsalud del; Carrasco-Marín, Francisco; González-Gutiérrez, Linda V.

doi:10.1016/j.jelechem.2018.10.019

Cited by 8 publications

(10 citation statements)

References 24 publications

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“…Deconvolution of the high-resolution XPS profile of Ag3 d ( figure 7 g ) reveals two new strong peaks at 367.82 and 368.42 eV for Ag-SH-PANF, indicating that Ag was successfully chelated. These are attributed to silver ions bound to amino, sulfhydryl and disulfide groups, respectively [ 50 , 51 ]. Consequently, we could confirm that the adsorption of Ag was achieved by its chelation with the amino, sulfhydryl and disulfide groups of SH-PANF.…”

Section: Resultsmentioning

confidence: 99%

Preparation of polyacrylonitrile-based fibres with chelated Ag ions for antibacterial applications

Duan

Chen

et al. 2020

R. Soc. open sci.

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The need for an excellent antibacterial material that is sufficiently powerful to never develop bacterial resistance is urgent. In this study, a series of novel polyacrylonitrile-based fibres with chelated Ag ions (referred to as Ag-SH-PANF) were prepared by a two-step chemical modification process: grafting and chelating. The properties of the as-prepared Ag-SH-PANF were characterized by Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The antibacterial activities of Ag-SH-PANF were examined against pathogenic bacteria, and an antibacterial mechanism was explicated based on the release of Ag ions from the fibres' surfaces. The results showed that, although chelation occurred between the Ag ions and the grafted amino, sulfhydryl and disulfide groups, Ag-SH-PANF retained its fine microstructure and thermal stability. Moreover, Ag-SH-PANF displayed excellent antibacterial ability against pathogenic bacteria as well as good washing durability. In terms of the antibacterial mechanism, Ag ions are the main bactericidal agents in the role of catalysts and are not consumed in the antibacterial process. Nonetheless, a relatively higher concentration of Ag ions can accelerate the bactericidal process.

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Section: Resultsmentioning

confidence: 99%

Preparation of polyacrylonitrile-based fibres with chelated Ag ions for antibacterial applications

Duan

Chen

et al. 2020

R. Soc. open sci.

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“…The results obtained are shown in Table 1. Taking into consideration the electroactive area values for CPE-GP1 (0.054 cm 2 ), CPE-GPU1 (0.175 cm 2 ) and, CPE-GPM1 (0.019 cm 2 ) it can be concluded that the following: i) the electroactive area is higher than the geometric area (0.0452 cm 2 ) due to the incorporation of the active material (functionalized grapefruit peels) which are a porous material, a special case occurs for CPE-GPM1 in which this condition is not appreciated, because the incorporation of melamine to grapefruit peels collapses the intricate porosity of the material due to the formation of agglomerates, as previously discussed by Romero-Cano et al, [16,25]; ii)…”

Section: Research Articlementioning

confidence: 87%

“…For the CPE-GP1 (Figure 4a), two signals can be seen. Peak 1 at 0.13 V (vs. MSE) can be attributed to the reduction of Ag + to Ag 0 , which has been anchored in À COOH and À NH 2 groups [16]. Simultaneously, the signal P2, with a peak current of 12.48 � 0.72 mA (0.52 V vs. MSE), is attributed to the oxidation of Ag 0 .…”

Section: Cyclic Voltammetry Studiesmentioning

confidence: 94%

“…Based on the information gathered, it is proposed that the silver detection mechanism is carried out in three stages (Figure 6c). Firstly, the diffusion and adsorption of the metal on the nitrogenated groups of the biomaterial is carried out by the formation of the R-NH 2 Ag + complex as discussed in previous works [15,16]. In a second stage when applying a potential of 0.13 V (vs. MSE) the reduction of the preconcentrated Ag + on the electrode surface is performed.…”

Section: Differential Pulse Voltammetry (Dpv)mentioning

confidence: 99%

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Development of Bio‐inspired Composite Materials for the Detection of Traces of Silver Present in Water: Use of Taguchi Methodology to Design Low‐cost Carbon Paste Electrodes

et al. 2021

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Carbon Paste Electrodes (CPE) modified with Grapefruit‐Peels (GP) functionalized with Urea (GPU) and, Melamine (GPM) were designed for the detection of Ag+ in water. Taguchi L9 methodology was used to determine the optimal graphite‐Active material ratio. The best electrochemical response was for CPE‐GPU with an 80 : 20 ratio. The results obtained showed a linear detection range between 0.5 to 28 μg L−1, with a detection limit of 0.73 μg L−1 and a limit of quantification of 1.04 μg L−1. Attributable to CPE‐GPU characteristics: electroactive surface area 0.175 cm2, roughness factor 3.87, resistance 0.09 Ω and, mostly −NH2 groups on its surface. The composite material offers a viable option to be used for the determination of silver traces in situ in industrial processes.

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“…11 A variety of adsorbents have been developed and found to be effective in removing silver ions, such as activated carbon, 12 graphene oxide, 13 bentonite, 14 L-cysteine functionalized cellulose microsphere, 1 thiol-modified magnetic polypyrrole nanocomposite, 15 and other forestry and agricultural residues, and so on. [16][17][18][19] Among these adsorbents, cellulose and its derivatives adsorbents are regarded as promising adsorbents and have attracted extensive attention due to their renewability, biodegradability, and biocompatibility. 20 However, there are few studies on the removal of silver ions by cellulose adsorbents; ( 1,2122,23 ), and due to the low concentration of silver in water (<20 mg L À1 ), most of the cellulose adsorbents exhibited low removal efficiency, which greatly limited their practical applications.…”

Section: Introductionmentioning

confidence: 99%

Removal behavior and mechanism of silver from low concentration wastewater using cellulose aerogel modified by thiosemicarbazide

Liu

Pei

et al. 2021

J of Applied Polymer Sci

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Due to the low concentration of silver in water, most of the cellulose adsorbents exhibited low removal efficiency, which greatly limited their practical applications. Herein, a cellulose aerogel modified by thiosemicarbamide (CAT) was fabricated for reducing and adsorbing silver ions from low concentration wastewater. The characterization results concluded that CAT owned a threedimensional spongy structure with many circular microspheres and a better specific surface area (19.37 m 2 g À1 ), as well as the functional groups of ─C═N + ─H and ─(C═S)─N. The static batch adsorption experiments demonstrated that CAT could reached the maximum removal percentage of 94.94% and adsorption capacity of 42.12 mg g À1 under the initial concentration of Ag(I) was 15 mg L À1 and the pH value was 7. Meanwhile, the adsorption of Ag(I) on CAT was second-order reaction, and the Langmuir model could better fit the adsorption process. In addition, CAT exhibited wide pH values (1-9) adaptability and excellent adsorption performance for silver through electrostatic interaction, chelation, and reduction. This study probably provides a new method as well as important experimental data and theoretical reference for the removal of silver ions and other metals.

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Use of carbon paste electrodes as a novel strategy to study adsorption mechanism of silver ions onto functionalized grapefruit peel

Cited by 8 publications

References 24 publications

Preparation of polyacrylonitrile-based fibres with chelated Ag ions for antibacterial applications

Preparation of polyacrylonitrile-based fibres with chelated Ag ions for antibacterial applications

Development of Bio‐inspired Composite Materials for the Detection of Traces of Silver Present in Water: Use of Taguchi Methodology to Design Low‐cost Carbon Paste Electrodes

Removal behavior and mechanism of silver from low concentration wastewater using cellulose aerogel modified by thiosemicarbazide

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