Kinetics and thermodynamics of mercury adsorption onto thiolated graphene oxide nanoparticles

Mohammadnia, Esmail; Hadavifar, Mojtaba; Veisi, Hojat

doi:10.1016/j.poly.2019.114139

Cited by 32 publications

(9 citation statements)

References 68 publications

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“…Indeed, more negative values of ΔH were obtained by increasing the temperature in the unsaturated model, indicating that the exothermic nature of the Hg 2+ adsorption process is favored with the rise of the temperature. On the other hand, the negative entropy change values (ΔS < 0) showed a decrease in the level of disorder and randomness at the solid‐solution interface during the Hg 2+ adsorption process, leading to a decrease in the degree of freedom of the adsorbed species [ 30,68 ] ; this behavior relates to the chemisorption process, and it is indicative of more feasible Hg 2+ adsorption onto active sites of the adsorbent. [ 34 ] The signs of the ΔH and ΔS values are also negative with the saturated model, but these properties showed a contrary tendency through the increase of the temperature; however, the complete balance between both these values led to negative ΔG values.…”

Section: Resultsmentioning

confidence: 99%

Toward the design of efficient adsorbents for Hg²⁺ removal: Molecular and thermodynamic insights

Forgionny

Acelas

Jimenez-Orozco

et al. 2020

Int J of Quantum Chemistry

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A systematic DFT study was performed to evaluate the effect of oxygenated functional groups for Hg2+ adsorption in aqueous systems. This work includes several aspects usually neglected in many current works, namely, ground‐state multiplicity, solvation effects, establishment of thermodynamic parameters, atomic charge transfer, and modeling of infrared spectra. In addition, two carbonaceous models were studied to account for both the effect of the carbonaceous matrix and the oxygenated functional groups on the Hg2+ binding. Adsorption energies indicated that Hg2+ adsorption on the unsaturated model is favored in the following order: phenol > lactone > semiquinone > carboxyl, whereas for the saturated model, the Hg2+ adsorption energy decrease order is: carboxyl > semiquinone > lactone. Thermodynamic parameters confirmed that the adsorption process is spontaneous (unsaturated model), while the infrared spectra provided an insight at the atomic level about the experimentally reported bands. Our results contributed to a deeper understanding of the current experimental information on the effect of the surface functional groups on the Hg2+ adsorption over carbonaceous materials as different active sites can be present on oxygenated carbonaceous materials for metal adsorption. The results also create new ways to improve the performance of adsorption capability of mercury and other pollutants.

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Section: Resultsmentioning

confidence: 99%

Toward the design of efficient adsorbents for Hg²⁺ removal: Molecular and thermodynamic insights

Forgionny

Acelas

Jimenez-Orozco

et al. 2020

Int J of Quantum Chemistry

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“…Graphene oxide nanoparticles were thiol-functionalized, magnetized and used to remove Hg(II) [79]. The maximum adsorbing capacity of thiol-functionalized graphene oxide was estimated to be 0.65 mmol/g by Langmuir model in a spontaneous process.…”

Section: 6-diaminopyridine (Pd) and Polyamine Compoundsmentioning

confidence: 99%

Adsorption Processing for the Removal of Toxic Hg(II) from Liquid Effluents: Advances in the 2019 Year

López

2020

Metals

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Mercury is a toxic metal, thus, it is an element which has more and more restrictions in its uses, but despite the above, the removal of this metal, from whatever the form in which it is encountered (zero valent metal, inorganic, or organic compounds), and from different sources, is of a widespread interest. In the case of Hg(II), or Hg2+, the investigations about the treatment of Hg(II)-bearing liquid effluents (real or in most cases synthetic solutions) appear not to end, and from the various separation technologies, adsorption is the most popular among researchers. In this topic, and in the 2019 year, more than 100 publications had been devoted to this field: Hg(II)-removal-adsorption. This work examined all of them.

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“…The presence of Hg (II) in low concentrations (ppb level) is difficult to remove. Most of the adsorbents reported are based on the removal of Hg (II) present at higher concentrations, such as thiolated graphene oxide nanoparticles [27], chitosan nano composite embedded with Brassica Gongylodes [28], and cellulose nanofibers@ZrO 2 [29].…”

Section: Introductionmentioning

confidence: 99%

Highly stable functionalized PAN/Zr nanofibrous mats for removal of ultralow concentrations of Hg (II)

Sharma,

Tiwari,

Singh

et al. 2023

Funct. Compos. Struct.

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Nanofibrous mats of polyacrylonitrile loaded with zirconia (PAN/Zr) have been fabricated and reported for the first time for effective removal of Hg (II) from water. The formation, morphology and adsorption characteristics of the composite nanofibrous mats were determined using scanning electron microscopy, Fourier transform infrared spectroscopy, x-ray diffraction and x-ray photoelectron spectroscopy. The thermal behavior of the prepared nanofibrous mat was studied using thermogravimetric analysis (TGA) and differential scanning calorimetry. The adsorption behavior of the nanofibers was studied as a function of time, pH, dose and concentration of the Hg solution. The Langmuir isotherm of the developed material indicates that it is very effective at removing low concentrations of Hg (even <50 ppb) in water. Kinetic data were fitted to first- and second-order kinetics, and the material was successfully regenerated by an acid solution and reused three times while retaining 80% removal efficiency for Hg. As the PAN/Zr/composite nanofibers are chemically and thermally stable, they can be easily regenerated and reused for effective removal of Hg(II), as per WHO/Environmental Protection Agency requirements.

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Kinetics and thermodynamics of mercury adsorption onto thiolated graphene oxide nanoparticles

Cited by 32 publications

References 68 publications

Toward the design of efficient adsorbents for Hg²⁺ removal: Molecular and thermodynamic insights

Toward the design of efficient adsorbents for Hg²⁺ removal: Molecular and thermodynamic insights

Adsorption Processing for the Removal of Toxic Hg(II) from Liquid Effluents: Advances in the 2019 Year

Highly stable functionalized PAN/Zr nanofibrous mats for removal of ultralow concentrations of Hg (II)

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Kinetics and thermodynamics of mercury adsorption onto thiolated graphene oxide nanoparticles

Cited by 32 publications

References 68 publications

Toward the design of efficient adsorbents for Hg2+ removal: Molecular and thermodynamic insights

Toward the design of efficient adsorbents for Hg2+ removal: Molecular and thermodynamic insights

Adsorption Processing for the Removal of Toxic Hg(II) from Liquid Effluents: Advances in the 2019 Year

Highly stable functionalized PAN/Zr nanofibrous mats for removal of ultralow concentrations of Hg (II)

Contact Info

Product

Resources

About

Toward the design of efficient adsorbents for Hg²⁺ removal: Molecular and thermodynamic insights

Toward the design of efficient adsorbents for Hg²⁺ removal: Molecular and thermodynamic insights