Details
| Original language | English |
|---|---|
| Pages (from-to) | 6234-6247 |
| Number of pages | 14 |
| Journal | Materials Advances |
| Volume | 5 |
| Early online date | 8 Jul 2024 |
| Publication status | Published - 2024 |
Abstract
In this study, the geopolymer composites GP0, GP7.5-CP, and GP10-CP were synthesized using mixtures of pozzolan (Pz) and waste charcoal powders (CP) as precursors with CP mass contents of 0, 7.5 and 10%, respectively. The geocomposites obtained were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET) surface analysis and scanning electron microscopy analysis (SEM). The sequestration performance for crystal violet (CV) and chromium VI (Cr VI) was evaluated in mono- and bi-component systems. The incorporation of 7.5% CP (GP7.5-CP) resulted in a ∼19% increase in the specific surface area and densification of the functional groups. Incorporation of CP increased the adsorption capacity due to (1) increased surface areas (2) increased active functional group density and distribution, and (3) shielding effect of CP on acidic sites improving CV adsorption. The adsorption capacities in binary systems were 45 and 59% higher than in single solute systems for CV and Cr(vi), respectively. The Rq > 1 and 1/n > 1 implied synergistic and cooperative adsorption, denoting adsorption of Cr(vi) creates new binding sites for CV adsorption. Ultrahigh adsorption density of 2803 and 3659 mg g−1 in single solute systems was achieved for CV and Cr(vi), respectively. The adsorption mechanism is multi-mechanistic involving the reduction of HCrO4− to Cr3+ by the donor groups of geocomposites, ion exchange, electrostatic and hydrogen bonding interactions. Modification of geopolymers with coal ash stupendously ameliorates their adsorption capacity for simultaneous adsorption of dyes and heavy metals in water.
ASJC Scopus subject areas
- Chemistry(all)
- Chemistry (miscellaneous)
- Materials Science(all)
- General Materials Science
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In: Materials Advances, Vol. 5, 2024, p. 6234-6247.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Synergistic co-adsorptive removal of crystal violet and chromium(vi) from water by pozzolan-charcoal based geopolymer composites
AU - Mboka, Jacques Madiba
AU - Tamaguelon, Hermann Dzoujo
AU - Shikuku, Victor Odhiambo
AU - Tome, Sylvain
AU - Pokeya, Romain
AU - Njouond, Donald Kamdem
AU - Titini, Fidele Gallo
AU - Limon, Aysenur
AU - Janiak, Christoph
AU - Dika, Marchand Manga
AU - Etoh, Marie Annie
AU - Dina, David Joh Daniel
N1 - Publisher Copyright: © 2024 RSC.
PY - 2024
Y1 - 2024
N2 - In this study, the geopolymer composites GP0, GP7.5-CP, and GP10-CP were synthesized using mixtures of pozzolan (Pz) and waste charcoal powders (CP) as precursors with CP mass contents of 0, 7.5 and 10%, respectively. The geocomposites obtained were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET) surface analysis and scanning electron microscopy analysis (SEM). The sequestration performance for crystal violet (CV) and chromium VI (Cr VI) was evaluated in mono- and bi-component systems. The incorporation of 7.5% CP (GP7.5-CP) resulted in a ∼19% increase in the specific surface area and densification of the functional groups. Incorporation of CP increased the adsorption capacity due to (1) increased surface areas (2) increased active functional group density and distribution, and (3) shielding effect of CP on acidic sites improving CV adsorption. The adsorption capacities in binary systems were 45 and 59% higher than in single solute systems for CV and Cr(vi), respectively. The Rq > 1 and 1/n > 1 implied synergistic and cooperative adsorption, denoting adsorption of Cr(vi) creates new binding sites for CV adsorption. Ultrahigh adsorption density of 2803 and 3659 mg g−1 in single solute systems was achieved for CV and Cr(vi), respectively. The adsorption mechanism is multi-mechanistic involving the reduction of HCrO4− to Cr3+ by the donor groups of geocomposites, ion exchange, electrostatic and hydrogen bonding interactions. Modification of geopolymers with coal ash stupendously ameliorates their adsorption capacity for simultaneous adsorption of dyes and heavy metals in water.
AB - In this study, the geopolymer composites GP0, GP7.5-CP, and GP10-CP were synthesized using mixtures of pozzolan (Pz) and waste charcoal powders (CP) as precursors with CP mass contents of 0, 7.5 and 10%, respectively. The geocomposites obtained were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET) surface analysis and scanning electron microscopy analysis (SEM). The sequestration performance for crystal violet (CV) and chromium VI (Cr VI) was evaluated in mono- and bi-component systems. The incorporation of 7.5% CP (GP7.5-CP) resulted in a ∼19% increase in the specific surface area and densification of the functional groups. Incorporation of CP increased the adsorption capacity due to (1) increased surface areas (2) increased active functional group density and distribution, and (3) shielding effect of CP on acidic sites improving CV adsorption. The adsorption capacities in binary systems were 45 and 59% higher than in single solute systems for CV and Cr(vi), respectively. The Rq > 1 and 1/n > 1 implied synergistic and cooperative adsorption, denoting adsorption of Cr(vi) creates new binding sites for CV adsorption. Ultrahigh adsorption density of 2803 and 3659 mg g−1 in single solute systems was achieved for CV and Cr(vi), respectively. The adsorption mechanism is multi-mechanistic involving the reduction of HCrO4− to Cr3+ by the donor groups of geocomposites, ion exchange, electrostatic and hydrogen bonding interactions. Modification of geopolymers with coal ash stupendously ameliorates their adsorption capacity for simultaneous adsorption of dyes and heavy metals in water.
UR - http://www.scopus.com/inward/record.url?scp=85198100321&partnerID=8YFLogxK
U2 - 10.1039/d4ma00408f
DO - 10.1039/d4ma00408f
M3 - Article
AN - SCOPUS:85198100321
VL - 5
SP - 6234
EP - 6247
JO - Materials Advances
JF - Materials Advances
ER -