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- Title
Ni-Fe and Zn-Fe LDHs synthesized by co-precipitation method at variable pH: application to the removal of Cochineal Red A dye from aqueous solution.
- Authors
Mendil, Rachida; Nasrallah, Noureddine
- Abstract
Co-precipitation at constant pH is a common method for the preparation of layered double hydroxides (LDHs) and related materials. In this work, Ni-Fe and Zn-Fe materials were co-precipitated at variable pH and characterized by X-ray diffraction and infrared spectroscopy. The batch method for evaluating the adsorption of Cochineal Red A dye into prepared materials was investigated. It has found that the sorbed amount depends on the nature and content of bi- and trivalent metal ions in LDH. The removal of Cochineal Red A dye reaches its maximum of 98.44% and 96.86% after 60 and 80 min for Ni-Fe and Zn-Fe respectively with the use of the optimum masses of 40 and 100 mg for these respective materials. Freundlich and Temkin isotherm models were applied to describe the equilibrium sorption experimental data. The Cochineal Red A dye sorption follows the Temkin model with high coefficient correlation for the two materials. This indicates that the adsorption is characterized by a uniform distribution of binding energies between the molecules adsorbed and adsorbents. The sorption kinetics data fitted the pseudo-second-order model. Adsorption experiments were carried out as a function of pH, temperature and sorbent dose. The sorption was found to be a pH independent for Ni-Fe material, whereas, higher pH potentially causes dissolution of Zn-Fe material. Thermodynamic study indicates that the sorption process is spontaneous and endothermic in nature.
- Subjects
COLOR removal in water purification; AQUEOUS solutions; LAYERED double hydroxides; COPRECIPITATION (Chemistry); INFRARED spectroscopy; SORPTION
- Publication
Desalination & Water Treatment, 2022, Vol 264, p205
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2022.28448