Dégradation d’un colorant cationique par la photocatalyse-solaire à travers une argile Algérienne imprégnée avec TiO2

A. Behilil, D. Lahcene, B. Zahraoui, H. Benmehdi, M. Belhachemi, A. Choukchou-Braham


Abstract: Water pollution remains a major problem to be solved by improving not only conventional industries, but also new eco-designed technologies for the treatment of polluted water. Several clay-based materials have been used in photo catalysis, in particular clays modified by impregnation, grafting, ion exchange, etc. This work aims to degrade the dye, Methylene Blue (BM) by photocatalysis-solar using clay from southwest of Algeria. This material was modified by the impregnation method with two different percentages of 05 and 15 wt% TiO2. Samples are characterized by several analytical techniques such as DRX, ATG-ATD, BET and FT-IR. The results show that the raw clay contains three phases, quartz, clinochlore, sericite 2M1 and the existence of a new phase for TiO2-modified clay (Anatase). The cation exchange capacity (CEC) is of the order of 9 meq / 100 g. the adsorption capacity of impregnated clay is important compared to the raw clay and the catalytic reactivity of the solar energy reaches a rate of 37% and 91% without and in the presence of oxygenated water (H2O2, 10 v), respectively.

Résumé: La pollution de l'eau reste un problème majeur à résoudre en améliorant non seulement les industries conventionnelles, mais également les nouvelles technologies éco-conçues, pour le traitement des eaux polluées. Plusieurs matériaux à base d'argile ont été utilisés dans la photo-catalyse, notamment des argiles modifiées par imprégnation, greffage, échange ion, etc… . Ce travail vise à dégrader le colorant, Bleu de Méthylène (BM) par la photocatalyse-solaire en utilisant la capacité de d'argile d’Ain Ouarka du sud-ouest Algérien de l'Algérie. Ce matériau a été modifié par la méthode d’imprégnation avec deux pourcentages différents 05 et 15wt% de TiO2. Les échantillons sont  caractérisés par plusieurs techniques d’analyse telles que la DRX, l’ATG-ATD la BET et FT-IR. Les résultats montrent que l'argile brute contient trois phases, le quartz, clinochlore, le séricite 2M1 et l'existence d'une nouvelle phase pour l'argile modifiée par TiO2 (Anatase). La capacité d'échange cationique (CEC) est de l’ordre de 9 méq/100 g, ainsi que les résultats montrent que la capacité d'adsorption de l’argile imprégnée est importante par rapport à l’argile brute et que la réactivité catalytique solaire atteint  un taux d’ordre 37 % et 91 % sans et en

présence de l’eau oxygénée (H2O2, 10 v), respectivement.

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