| Autor: |
Atout, Hicham, Manaa, Zoubir, Chebli, Derradji, Bouguettoucha, Abdellah, Meziani, Badreddine |
| Zdroj: |
Desalination & Water Treatment; August 2023, Vol. 304 Issue: 1 p247-256, 10p |
| Abstrakt: |
Layered double hydroxides MgAl-CO3synthesized by co-precipitation have been used to adsorb and degrade Congo red in aqueous solution. Prepared sample was characterized by scanning electron microscope, Fourier-transform infrared spectra, Brunauer–Emmett–Teller and point of zero charge. The adsorption system provided a value of 22.5 mg/g at natural pH (6.8). The kinetics analysis and isotherms outcomes showed that the adsorption achieve equilibrium adsorption/desorption after 90 min. Which validates that pseudo-second-order is the most accurate fit model. Freundlich isotherm model describes the adsorption isotherms system with R2= 0.98. While the photocatalytic degradation proved that the optimal elimination of Congo red was observed by adding H2O2under UV light. The H2O2added under UV light acts as the generator of OH•. The dissolved Fe3+reacts with H2O2to form a homogeneous Fenton like by producing OH•. The observed degradation decrease after adding Fe3+is explained by the appearance of sludge during the reaction. The Influencing factors of the removal of Congo red have been tested by varying initial pH and H2O2concentrations. The highest degradation was at natural pH (6.8) with C/C0= 0.329. While the H2O2concentration exhibits strong degradation with an amount of 3.3 mmol. |
| Databáze: |
Supplemental Index |
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