Adsorptive removal of cadmium(II) ions from liquid phase using acid modified carbon-based adsorbents

Ihsanullah, Fahad Abdulaziz Al-Khaldi, Basil Abusharkh, Mazen Khaled, Muataz Atieh, M. S. Nasser, Tahar Laoui, Tawfik A. Saleh, Shilpi Agarwal, Inderjeet Tyagi, Vinod Kumar Gupta

Research output: Contribution to journalArticle

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Abstract

This work reports a comprehensive study of the adsorption characteristics of cadmium(II) on modified structures of carbon nanotubes (CNTs), carbon nanofibres (CNFs), activated carbon (AC), and fly ash (FA). The characterization was performed using field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET) surface analysis. Several experimental parameters; adsorbent dosage, pH, and agitation speed and contact time, were investigated for their effects on the adsorption of cadmium(II) from water. The optimum conditions of 2 h of contact time, pH 7, 50 mg adsorbent dosage and 150 rpm rotational speed were observed. Models of first-order, second-order and pseudo-second-order were fitted to the experimental data, and pseudo-second-order kinetics were observed to describe the adsorption of cadmium(II) on these adsorbents. The adsorption behaviours of cadmium(II) were evaluated using the Freundlich and Langmuir isotherm models. The maximum adsorption capacities of the modified adsorbents were observed to be 2.02 mg/g, 1.98 mg/g, 1.22 mg/g and 1.58 mg/g, for CNTs, AC, CNFs and FA, as obtained from Langmuir isotherm models. It was determined that surface modification of the CNTs, CNFs, and AC enhanced their adsorption efficiency. The results obtained are promising for the use of these modified materials with respect to water purification applications.

Original languageEnglish
Pages (from-to)255-263
Number of pages9
JournalJournal of Molecular Liquids
Volume204
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

adsorbents
Cadmium
Adsorbents
cadmium
liquid phases
Carbon
Ions
Adsorption
carbon nanotubes
acids
Carbon Nanotubes
adsorption
Acids
Carbon nanofibers
carbon
Liquids
activated carbon
Activated carbon
Coal Ash
Carbon nanotubes

Keywords

  • Adsorption
  • Cadmium
  • Carbon-based adsorbents
  • Water treatment

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

Adsorptive removal of cadmium(II) ions from liquid phase using acid modified carbon-based adsorbents. / Ihsanullah; Al-Khaldi, Fahad Abdulaziz; Abusharkh, Basil; Khaled, Mazen; Atieh, Muataz; Nasser, M. S.; Laoui, Tahar; Saleh, Tawfik A.; Agarwal, Shilpi; Tyagi, Inderjeet; Gupta, Vinod Kumar.

In: Journal of Molecular Liquids, Vol. 204, 2014, p. 255-263.

Research output: Contribution to journalArticle

Ihsanullah, Al-Khaldi, FA, Abusharkh, B, Khaled, M, Atieh, M, Nasser, MS, Laoui, T, Saleh, TA, Agarwal, S, Tyagi, I & Gupta, VK 2014, 'Adsorptive removal of cadmium(II) ions from liquid phase using acid modified carbon-based adsorbents', Journal of Molecular Liquids, vol. 204, pp. 255-263. https://doi.org/10.1016/j.molliq.2015.01.033
Ihsanullah ; Al-Khaldi, Fahad Abdulaziz ; Abusharkh, Basil ; Khaled, Mazen ; Atieh, Muataz ; Nasser, M. S. ; Laoui, Tahar ; Saleh, Tawfik A. ; Agarwal, Shilpi ; Tyagi, Inderjeet ; Gupta, Vinod Kumar. / Adsorptive removal of cadmium(II) ions from liquid phase using acid modified carbon-based adsorbents. In: Journal of Molecular Liquids. 2014 ; Vol. 204. pp. 255-263.
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AU - Ihsanullah,

AU - Al-Khaldi, Fahad Abdulaziz

AU - Abusharkh, Basil

AU - Khaled, Mazen

AU - Atieh, Muataz

AU - Nasser, M. S.

AU - Laoui, Tahar

AU - Saleh, Tawfik A.

AU - Agarwal, Shilpi

AU - Tyagi, Inderjeet

AU - Gupta, Vinod Kumar

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N2 - This work reports a comprehensive study of the adsorption characteristics of cadmium(II) on modified structures of carbon nanotubes (CNTs), carbon nanofibres (CNFs), activated carbon (AC), and fly ash (FA). The characterization was performed using field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET) surface analysis. Several experimental parameters; adsorbent dosage, pH, and agitation speed and contact time, were investigated for their effects on the adsorption of cadmium(II) from water. The optimum conditions of 2 h of contact time, pH 7, 50 mg adsorbent dosage and 150 rpm rotational speed were observed. Models of first-order, second-order and pseudo-second-order were fitted to the experimental data, and pseudo-second-order kinetics were observed to describe the adsorption of cadmium(II) on these adsorbents. The adsorption behaviours of cadmium(II) were evaluated using the Freundlich and Langmuir isotherm models. The maximum adsorption capacities of the modified adsorbents were observed to be 2.02 mg/g, 1.98 mg/g, 1.22 mg/g and 1.58 mg/g, for CNTs, AC, CNFs and FA, as obtained from Langmuir isotherm models. It was determined that surface modification of the CNTs, CNFs, and AC enhanced their adsorption efficiency. The results obtained are promising for the use of these modified materials with respect to water purification applications.

AB - This work reports a comprehensive study of the adsorption characteristics of cadmium(II) on modified structures of carbon nanotubes (CNTs), carbon nanofibres (CNFs), activated carbon (AC), and fly ash (FA). The characterization was performed using field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET) surface analysis. Several experimental parameters; adsorbent dosage, pH, and agitation speed and contact time, were investigated for their effects on the adsorption of cadmium(II) from water. The optimum conditions of 2 h of contact time, pH 7, 50 mg adsorbent dosage and 150 rpm rotational speed were observed. Models of first-order, second-order and pseudo-second-order were fitted to the experimental data, and pseudo-second-order kinetics were observed to describe the adsorption of cadmium(II) on these adsorbents. The adsorption behaviours of cadmium(II) were evaluated using the Freundlich and Langmuir isotherm models. The maximum adsorption capacities of the modified adsorbents were observed to be 2.02 mg/g, 1.98 mg/g, 1.22 mg/g and 1.58 mg/g, for CNTs, AC, CNFs and FA, as obtained from Langmuir isotherm models. It was determined that surface modification of the CNTs, CNFs, and AC enhanced their adsorption efficiency. The results obtained are promising for the use of these modified materials with respect to water purification applications.

KW - Adsorption

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KW - Carbon-based adsorbents

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