An-Najah Staff

Disposal of industrial wastewater containing pyridazine compound by electrochemical methods has been studied in this paper. It was found that only a small fraction of the organics was xidised by direct electrolyses, while complete mineralisation of the organics was obtained with the indirect process, electrogenerating hypochlorite from chloride oxidation. The effects of perating factors, such as concentration of pyridazine, current density and chloride oncentration, were also investigated. The experimental data suggested that the Boron-Doped Diamond Anode (BDD) had the highest electrocatalytic activity and increasing the chloride concentration in the lectrolyte resulted in an increasing of COD and electro- oxidation removal.

The effect of temperature on the corrosion behavior of copper in 2M nitric acid solution in the presence and absence of 5-(2,6-dichlorobenzyl)-6-methylpyridazin-3(2H)-one (P3) has been investigated by weight loss method. The inhibitory effect increases with increasing inhibitors concentration and decreases with rise of temperature from 303 to 343K. Adsorption follows the Langmuir isotherm with negative values of free enthalpy suggesting a spontaneous adsorption process. Other thermodynamic parameters such as, equilibrium constant, adsorption heat and adsorption entropy were obtained. The various parameters of activation determining the kinetic data such as energy, enthalpy and entropy at different concentrations of the inhibitor were evaluated and discussed.