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- Title
Comparative study on adsorptive efficiency assessment of Congo red dye from aqueous solutions using nanoporous zirconia oxides and anionic clays nanosheet.
- Authors
Saïah, Fatiha Boukraa Djellal; Bettahar, Noureddine
- Abstract
The approach of this study was the assessment of the dye sorption performance on hierarchical porous zirconium oxide ZrO2 as compared to the performance as decontaminant of various uncalcined anionic clays layered double hydroxide (LDH) and calcined clay. The aim of the work was also to propose probable adsorption mechanisms and interactions between the pollutant and surface of these materials. The LDHs materials, with molar ratios of 3:1 (M2+/M3+ = 3), were obtained by co-precipitation method. The ZrO2 nanoparticles were synthesized by a sol-gel process with the aid of a structure-directing surfactant. The obtained materials were characterized by X-ray diffraction, Fourier-transform infrared spectra, Brunauer-Emmett-Teller, transmission electron microscopy, scanning electron microscopy, thermogravimetric/Differential Scanning Calorimetry and pH of zero point charge (pHpzc) measurements. Elimination of acidic dye as a function of contacting time was studied. The adsorption was evaluated in the removal of Congo red (CR) from simulated wastewater. These results were compared with tests performed with Ni-X and Co-X (X = Fe and Al) LDHs, the calcined product of Ni-Fe (denoted CNiFe) and the zirconia oxide. All materials seems to have an affinity toward CR dye molecules in aqueous solution. Furthermore, the adsorption was more effective on calcined LDH clays than original precursors. The as-prepared zirconium oxides would be regarded as more effective adsorbents for the removal of acidic dye in wastewater treatment. The enhanced adsorption capacity of the zirconium oxide revealed that high specific surface area and hierarchical pore structure increases the active adsorption sites and promotes the interactions between the adsorbent and CR dye via electrostatic interactions, hydrogen bonding and may be trapped inside the pores.
- Subjects
CONGO red (Staining dye); POINTS of zero charge; AQUEOUS solutions; POROSITY; DIFFERENTIAL scanning calorimetry
- Publication
Desalination & Water Treatment, 2022, Vol 254, p260
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2022.28329