Bøger af Hency Thacker

In the present study, activated carbon is fabricated from male and female date palm leaves by chemical activation with phosphoric acid and is further examined for ferric ion removal from waste water. The study revealed that the uptake of ferric ions from aqueous media was found to be dependent on pH, adsorbent dosage, initial concentration, agitation time and temperature. The maximum adsorption capacity for male and female activated carbon was found to 17.2 mg/g and 22.2 mg/g respectively. The optimum conditions for ferric ions uptake from aqueous media by male activated carbon was found to pH=2.5, temperature=298K, initial concentration= 50 mg/L, adsorbent dosage=0.2 gm and agitation time=30 minutes. Similarly for female activated carbon optimum conditions were found to be pH=2.5, temperature=298K, initial concentration= 50 mg/L, adsorbent dosage=0.25 gm and agitation time=30 minutes.

In the present study, Phoenix Dactylifera L. extract is analyzed for its potential to prevent corrosion of aluminum under 1N HCl acidic media by weight loss measurement. Phoenix Dactylifera L. acetonitrile extract comprised of variety of phytochemicals like proteins, amino acids, carbohydrates, phenols, flavanoids, Phlobatannins, quinines, resins, steroids and triterpenoid. These phytochemicals are adsorbed on the surface of metals plates by means of hetero atom present in them. The adsorption behavior of these phytochemicals on the surface of Al plates is in accordance with langmuir adsorption isotherm. The value of Gibb¿s free energy of adsorption was found to be -7.37 KJ mol-1 indicating spontaneous physisorption of extract molecules on the surface of Al plates.

This book describes adsorption of cupric ions on Phoenix Dactylifera L. leaves is described. The adsorption phenomena is found to be dependent on pH, adsorbent dose, initial concentration, temperature and agitation time. Further this process was evaluated by adsorption isotherms namely langmuir, Fruendlich, Temkin, Hasley, Jonovaic and so. Kinetic models pseudo first order, pseudo second order, Elovich, Intra-particle diffusion are also evaluated. The optimum conditions for cupric ion uptake were found to pH=1.5, adsorbent dose =0.2 gm, initial concentration= 10ppm, agitation time =30 minutes . The adsorption is best described by Temkin adsorption isotherm model and pseudo second order kinetic model. The maximum adsorption capacity was evaluated to be 2.48 mg/g.