Synthesis and characterization of a novel support based on hydrophobic clays and a Photosensitizer. Application to photodegradation of dyes

Z. Zeffouni, B. Cheknane, F. Zermane, S. Hanini


Abstract: The aim of this present study is to synthesise a series of new hydrophobic- modified organo montmorillonites (Hc) using two photosensitizers both methylene blue (MB) and Hematoporphyrin (HP). First, we modified a series of natural bentonite (NB) and sodium montmorillonite (Na-Mt) with a surfactant cetyltrimethyl ammonium bromide (CTAB). The incorporation of methylene blue and Hematoporphyrinas photosensitizers into Hc was carried out at various hydrophobic clay/ photosensitizers (2, 5, 10, 15 and 20% of HP and 0.5, 1, 5, 10, 15, 20, 25, 30 and 35% of MB) at room temperature. A kinetic study was carried out by varying the contact time, the pH of suspension and the adsorbate/ adsorbent ratio.

In the second step, we studied the efficiency of prepared support in the photodegradation of Tartrazine (TR), Methyl Orange (MO) and Rhodamine B (RB) by irradiation with visible light irradiation under oxygen atmosphere l>450 nm. The obtained results indicated that the increase of dyes concentration, decrease the adsorption yield photodegradation. The photosensitizers properties of MB were better than those of HP onto Mt-CTAB-MB with efficiencies of about 67.29 to 88.27% at different concentration of MO. 

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