Triazole containing magnetic core-silica shell nanoparticles for Pb 2+ , Cu 2+ and Zn 2+ removal

Mokadem, Zakaria; Mekki, Sofiane; Saïdi-Besbes, Salima; Agusti, Géraldine; Elaı̈ssari, Abdelhamid; Derdour, Aïcha

doi:10.1016/j.arabjc.2016.12.008

Cited by 47 publications

(27 citation statements)

References 47 publications

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“…The film thickness is 110 nm, a constant value over the whole film area. FTIR spectra (Figure C) confirm the expected composition of the hybrid film, with typical signatures for silica and the the iron‐triazole complex, Fe(Htrz) 3 (from the typical vibration bands of ≡C−H, −N−H, −C=N and −N=N groups ). Again, no noticeable difference can be observed before and after HCl/ethanol treatment, confirming that the iron‐triazole coordination polymer acting as template is strongly embedded in the mesostructure and can be thus used as a durably‐immobilized redox catalyst, as shown hereafter for the amperometric detection of H 2 O 2 .…”

Section: Resultssupporting

confidence: 94%

Non‐covalent Immobilization of Iron‐triazole (Fe(Htrz)₃) Molecular Mediator in Mesoporous Silica Films for the Electrochemical Detection of Hydrogen Peroxide

et al. 2019

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Mesoporous silica thin films encapsulating a molecular iron‐triazole complex, Fe(Htrz)3 (Htrz=1,2,4,‐1H‐triazole), have been generated by electrochemically assisted self‐assembly (EASA) on indium‐tin oxide (ITO) electrode. The obtained modified electrodes are characterized by well‐defined voltammetric signals corresponding to the FeII/III centers of the Fe(Htrz)3 species immobilized into the films, indicating fast electron transfer processes and stable operational stability. This is due to the presence of a high density of redox probes in the material (1.6×10−4 mol g−1 Fe(Htrz)3 in the mesoporous silica film) enabling efficient charge transport by electron hopping. The mesoporous films are uniformly deposited over the whole electrode surface and they are characterized by a thickness of 110 nm and a wormlike mesostructure directed by the template role played by Fe(Htrz)3 species in the EASA process. These species are durably immobilized in the material (they are not removed by solvent extraction). The composite mesoporous material (denoted Fe(Htrz)3@SiO2) is then used for the electrocatalytic detection of hydrogen peroxide, which can be performed by amperometry at an applied potential of −0.4 V versus Ag/AgCl and by flow injection analysis. The organic‐inorganic hybrid film electrode displays good sensitivity for H2O2 sensing over a dynamic range from 5 to 300 μM, with a detection limit estimated at 2 μM.

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Section: Resultssupporting

confidence: 94%

Non‐covalent Immobilization of Iron‐triazole (Fe(Htrz)₃) Molecular Mediator in Mesoporous Silica Films for the Electrochemical Detection of Hydrogen Peroxide

et al. 2019

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“…This finding indicated that the red mud and the prepared adsorbents have an energetically homogeneous surface [34] for the adsorption of Zn 2+ . P-200 showed the desirable adsorption capacity for Zn 2+ (89.6 mg/g), higher than that of red mud, P-120, P-270, and other reported magnetic adsorbents, such as graphene oxide (73 mg/g) [35], magnetic nano-silicon materials (51.2 mg/g) [36], and dry algae (60 mg/g) [37]. Therefore, P-200 has great potential for Zn 2+ adsorption.…”

Section: Adsorptionmentioning

confidence: 81%

“…However, at a low initial concentration of Zn 2+ , P-200 showed a high value of Kd in comparison with P-120, P-270 and commercial adsorbents (Table 2), such as graphene oxide [36] and Tunisian smectite [41], demonstrating that P-200 had desirable performance for sorption of Zn 2+ . Other adsorbents, such as magnetic core-silica shell particles [36], dry algae [37], and magnetic modified chitosan [42], showed very low Kd ( Table 2), indicating that they were fairly ineffective for Zn 2+ adsorption. The plots of adsorption capacity versus equilibrium concentration in solution did not yield a straight line ( Figure 8A).…”

Section: Adsorptionmentioning

confidence: 92%

“…Generally, at a high initial concentration of Zn 2+ , the surface sites of P-200 became saturated with Zn 2+ [39,40], which caused large number of unabsorbed Zn 2+ remaining in the liquid fraction and apparently exhibited low K d ( Figure 8A and Table 2). However, at a low initial concentration of Zn 2+ , P-200 showed a high value of K d in comparison with P-120, P-270 and commercial adsorbents (Table 2), such as graphene oxide [36] and Tunisian smectite [41], demonstrating that P-200 had desirable performance for sorption of Zn 2+ . Other adsorbents, such as magnetic core-silica shell particles [36], dry algae [37], and magnetic modified chitosan [42], showed very low K d ( Table 2), indicating that they were fairly ineffective for Zn 2+ adsorption.…”

Section: Adsorptionmentioning

confidence: 92%

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Hydrothermal Conversion of Red Mud into Magnetic Adsorbent for Effective Adsorption of Zn(II) in Water

et al. 2019

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Red mud, a Fe-rich waste generated from the aluminum industry, was recovered as an adsorbent for wastewater treatment. The separation process of red mud from water after adsorption, including centrifugation and filtration, was complicated. This study demonstrated an alternative option to recycle red mud for preparing magnetic adsorbent via a facile hydrothermal route using ascorbic acid as reductant. Red mud is weakly magnetized and consists of andradite, muscovite, hematite, and cancrinite. After hydrothermal treatment, andradite in red mud was reductively dissolved by ascorbic acid, and transformed into magnetite and morimotoite. With increasing hydrothermal temperature, the dissolution of andradite accelerated, and the crystallite size of magnetite increased. When the hydrothermal temperature reached 200 °C, the prepared adsorbent P-200 showed a desirable saturation magnetization of 4.1 Am2/kg, and could be easily magnetically separated from water after adsorption. The maximum adsorption capacity of P-200 for Zn2+ was 89.6 mg/g, which is eight-fold higher than that of the raw red mud. The adsorption of Zn2+ by P-200 fitted the Langmuir model, where cation exchange was the main adsorption mechanism. The average distribution coefficient of Zn2+ at low ppm level was 16.81 L/g for P-200, higher than those of the red mud (0.3 L/g) and the prepared P-120 (1.48 L/g) and P-270 (5.48 L/g), demonstrating that P-200 had the best adsorption capacity for Zn2+ and can be served as a practical adsorbent for real-world applications. To our knowledge, this is the first study to report the conversion of red mud into a magnetic adsorbent under mild conditions.

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“…In addition to detection, it is also important to remove heavy metal ions from the contaminated environment. One of the cleaning methods is sorption using various mesoporous materials, for example, Ca-based materials [ 32 ]. Calcium carbonate (CaCO 3 ) crystals are widely used for the manufacturing of carriers containing various embedded nanoparticles or biologically active compounds [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Magneto-Fluorescent Hybrid Sensor CaCO3-Fe3O4-AgInS2/ZnS for the Detection of Heavy Metal Ions in Aqueous Media

et al. 2020

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Heavy metal ions are not subject to biodegradation and could cause the environmental pollution of natural resources and water. Many of the heavy metals are highly toxic and dangerous to human health, even at a minimum amount. This work considered an optical method for detecting heavy metal ions using colloidal luminescent semiconductor quantum dots (QDs). Over the past decade, QDs have been used in the development of sensitive fluorescence sensors for ions of heavy metal. In this work, we combined the fluorescent properties of AgInS2/ZnS ternary QDs and the magnetism of superparamagnetic Fe3O4 nanoparticles embedded in a matrix of porous calcium carbonate microspheres for the detection of toxic ions of heavy metal: Co2+, Ni2+, and Pb2+. We demonstrate a relationship between the level of quenching of the photoluminescence of sensors under exposure to the heavy metal ions and the concentration of these ions, allowing their detection in aqueous solutions at concentrations of Co2+, Ni2+, and Pb2+ as low as ≈0.01 ppm, ≈0.1 ppm, and ≈0.01 ppm, respectively. It also has importance for application of the ability to concentrate and extract the sensor with analytes from the solution using a magnetic field.

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Triazole containing magnetic core-silica shell nanoparticles for Pb 2+ , Cu 2+ and Zn 2+ removal

Cited by 47 publications

References 47 publications

Non‐covalent Immobilization of Iron‐triazole (Fe(Htrz)₃) Molecular Mediator in Mesoporous Silica Films for the Electrochemical Detection of Hydrogen Peroxide

Non‐covalent Immobilization of Iron‐triazole (Fe(Htrz)₃) Molecular Mediator in Mesoporous Silica Films for the Electrochemical Detection of Hydrogen Peroxide

Hydrothermal Conversion of Red Mud into Magnetic Adsorbent for Effective Adsorption of Zn(II) in Water

Magneto-Fluorescent Hybrid Sensor CaCO3-Fe3O4-AgInS2/ZnS for the Detection of Heavy Metal Ions in Aqueous Media

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Triazole containing magnetic core-silica shell nanoparticles for Pb 2+ , Cu 2+ and Zn 2+ removal

Cited by 47 publications

References 47 publications

Non‐covalent Immobilization of Iron‐triazole (Fe(Htrz)3) Molecular Mediator in Mesoporous Silica Films for the Electrochemical Detection of Hydrogen Peroxide

Non‐covalent Immobilization of Iron‐triazole (Fe(Htrz)3) Molecular Mediator in Mesoporous Silica Films for the Electrochemical Detection of Hydrogen Peroxide

Hydrothermal Conversion of Red Mud into Magnetic Adsorbent for Effective Adsorption of Zn(II) in Water

Magneto-Fluorescent Hybrid Sensor CaCO3-Fe3O4-AgInS2/ZnS for the Detection of Heavy Metal Ions in Aqueous Media

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Non‐covalent Immobilization of Iron‐triazole (Fe(Htrz)₃) Molecular Mediator in Mesoporous Silica Films for the Electrochemical Detection of Hydrogen Peroxide

Non‐covalent Immobilization of Iron‐triazole (Fe(Htrz)₃) Molecular Mediator in Mesoporous Silica Films for the Electrochemical Detection of Hydrogen Peroxide