Enhanced Degradation of an Azo dye by Catalytic Ozonation over Ni-Containing Layered Double Hydroxide Nanocatalyst
Separation and Purification Technology 2019
Kaoutar El Hassani, Daina Kalniņa, Māris Turks, Buscotin Horax Beakou, Abdellah Anouar

The catalytic activity of Ni-based layered double hydroxides (Ni-LDHs) nanomaterials was studied for the first time in ozonation of simulated dyeing wastewater for dye degradation (methyl orange (MO)). For the purpose of comparison, degradation of MO by non-catalyzed ozonation was also considered. The degradation experiments were performed in a laboratory scale cylindrical batch reactor. The effect of catalyst was studied using UV–Vis, chemical oxygen demand (COD) and ion chromatography (IC) analyses. The influence of various operating factors such as reaction temperature, dye concentration, catalyst dosage and hydroxyl radical scavengers (bicarbonate-carbonate) on the MO dye degradation rate were investigated. The catalytic ozonation exhibits total discoloration with faster reaction rate and clearly enhances the COD removal. In optimized conditions, after 60 min reaction, COD removal has reached 72% in the catalytic ozonation process, while it reached only 30% in non-catalytic ozonation. Additionally, the characterization results of Ni-LDH catalyst before and after ozonation experiments were discussed. A possible mechanism of degradation was suggested.


Atslēgas vārdi
Ni-based layered double hydroxide, Catalytic ozonation, Methyl orange, Mineralization, COD removal
DOI
10.1016/j.seppur.2018.08.074
Hipersaite
https://www.sciencedirect.com/science/article/pii/S1383586618319294#s0125

El Hassani, K., Kalniņa, D., Turks, M., Horax Beakou, B., Anouar, A. Enhanced Degradation of an Azo dye by Catalytic Ozonation over Ni-Containing Layered Double Hydroxide Nanocatalyst. Separation and Purification Technology, 2019, Vol. 210, 764.-774.lpp. ISSN 1383-5866. Pieejams: doi:10.1016/j.seppur.2018.08.074

Publikācijas valoda
English (en)
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