The photocatalytic degradation of the synthetic textile dye Reactive Yellow 145 (RY 145) in aqueous solution, using TiO2 coated non-woven fibers as photocatalyst, under UV-lamp irradiation, was studied. The effects of the operational parameters such as initial dye concentration, pH, addition of oxidant hydrogen peroxide and addition of ethanol on the reaction rate were investigated. The effect of some inorganic ions such as
This study was conducted to assess the removal efficiency of pesticide (Carbaryl) used in Souss Massa region (Agadir city), on a clay originated from barrage situated in Agadir. The adsorption of Carbaryl from aqueous solution by local clay as a low-cost, natural and eco-friendly adsorbent was investigated. Different physicochemical parameters were analyzed: adsorbent mass, ionic strength (NaNO 3 ), initial concentration of pollutant, temperature, and pH. The empirical results showed that all these parameters have an impact on the retention of pesticide on the clay. The equilibrium uptake was increased with an increase in the initial pesticide concentration in solution. The results of adsorption were fitted to the Langmuir and Freundlich isotherms. The Freundlich model represented the adsorption process better than Langmuir model, with correlation coefficients (R 2 ) values ranged from 0.97 to 0.99. This study has shown that the natural clay is a solid that has got an important adsorption capacity, which may be used in treatment and depollution of water.
Experimental design methodology was applied for the optimization of indigo carmine dye photocatalytic degradation by supported TiO 2 and UV light in a flow reactor. The variables considered were the initial concentration, pH, volume of solution and recirculation flow rate. The effects of individual variables and their interaction effects for the photocatalytic degradation efficiency (%) were determined. From statistical analysis, the most effective parameters were pH and initial concentration. The optimized condition of the photocatalytic degradation of indigo carmine were; initial concentration, 4 mg L -1 ; pH, 3; volume of solution, 2540 mL; recirculation flow rate, 400 mL min -1 .
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