The kinetics of particle deposition onto the surface of spherical collector particles suspended in a stirred batch vessel was investigated. The study considered monodisperse particle and monodisperse spherical collector particles. The Langmuir model for the deposition process was presented with model parametric study as well as model limiting cases of Smoluchowski analysis and equilibrium state. A method for obtaining the model parameters from model limiting cases was demonstrated. The model was experimentally tested by studying the deposition of small carbon particles onto plastic spheres. This is useful in the de-inking process of waste paper using plastic spheres. The obtained deposition curves are fitted to the model. The estimated parameters from model limiting cases are in agreement with those, obtained from the full deposition curves fitted to Langmuir kinetics. The maximum 431 ORDER REPRINTS number of carbon particles that can deposit on plastic particles is estimated theoretically from geometrical analysis. The estimated value is very close to that determined from the model.

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This investigation is dealing with adsorption of benzene compound from aqueous solution using a new carbon nanotube (CNT) synthesized from a fuel oil waste of power plants which identify by FE-SEM and TEM. It was found that a CNT has a very significant adsorption for benzene compared to that of non-activated carbon. The equilibrium adsorption data were analyzed using adsorption models of Langmuir, Freundlich and Temkin. The results showed that the model isotherms are fitting very well with the experimental data. Kinetic study was conducted and the results pointed out that a pseudo-first order model was represented the data. Values of the activation thermodynamic functions were calculated through equilibrium constants at different temperature. All values of Gibbs functions were negative with values of-1.6 and-13.0 kJmol-1 for non-active and CNT respectively, while values of enthalpy and entropy were about-33kJmol-1 and-65JK-1 mol-1 for CNT respectively. These results indicated that the adsorption process was feasible, spontaneous and exothermic.

The photo transitions of Erythromycin 2-propionate dodecyl sulphate (C40H71NO14, C12H26O4S) using Nitrogen Laser beam have been studied at different periods of time. Different techniques have been used to analyze and identify final products.The results showed that photo transitions of Erythromycin -Estolate which measured by conductivity initially increased and then decreased with time especially at high pulse rate. While pH showed a different behavior and initially there was reduction in pH values by increasing the pulse rate. The kinetic study indicated that the rate of reaction is of the second-order type . The qualitative identification showed that the final products were; First: 6-(4-Dimethylamino-3-O-propionyl -6-methyltetrahydro-pyran-2yloxy)-14-ethyl-4-(5-hydroxy-4-methoxy-4,6-dimethy-tetrahydro-pyran-2yloxy)-3,5,7,9,11,13-hexamethyl-oxacyclotetradeca-2,10-dione-7,12,13propaniol dodecyl sulphate.  Second: 6-(4-Dimethylamino-3-O-propionyl -6-methyltetrahydro-pyran-2yloxy)-14-ethyl-4-(5-hydroxy-4-methoxy-4,6-dimethy-tetrahydro-pyran-2yloxy)-3,5,7,9,11,13-hexamethyl-oxacyclotetradeca-2,9-diene-2,7,10,12,13pentaol dodecyl sulphate. The final products showed an existaence of enol group through a tautomerism reaction of keto enol.

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