期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 679, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2023.132630
关键词
Raw clays; Pollutants; Water treatment; Fenton oxidation; Electro-Fenton; Degradation
Three raw clays from Morocco were used as heterogeneous catalysts for Fenton-like oxidation of organic pollutants in water. The results showed that the clays were effective in the degradation of dyes and caffeine, and the clay-modified electrodes also showed good performance in the degradation of dyes.
Three raw clays from Morocco were used as heterogeneous catalysts for Fenton-like oxidation of organic pol-lutants in water. The selected pollutants were two dyes used in the textile industry, Congo Red (CR) and Tar-trazine (Tar, known also as a food coloring compound, E102) and Caffeine (Caf), a stimulant drug present in popular beverages such as coffee and tea, commonly used in Morocco. Two different processes were used for their degradation: (i) Fenton-like reaction; and (ii) electro-Fenton-like reaction. Process (i) was used for Tar and Caf degradation in the presence of clays from different region of Morocco (Middle Atlas -ClayMA, Fez -ClayF, and Ourika -ClayO), the best results being obtained with ClayO and ClayMA, on which 60.0% and 23.4% of conversion and 41.0% and 20.5% of mineralization were achieved for Tar and Caf, respectively. Process (ii) was used for degrading CR by clay-modified electrodes (CME) using the rawclays from Fez and Ourika regions (ClayF and ClayO). The stability of the CME was assessed by cyclic voltammetry studies, which proved that they are stable in the experimental conditions used. The electrodegradation of CR dye, performed without hydrogen peroxide in the reaction medium, achieve 67.0% of mineralization at the end of electrolysis (2 h).
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