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دراسة حركية وثرموديناميكية لامتزاز بعض الاصباغ باستخدام اوراق الكالبتوز العراقية جطيواث الفضة النانوية المحضره منها == Kinetic, and the Thermodynamic Studies of Adsorption of Some Dyes by Using Iraqi Eucalyptus Leaves and Silver nanoparticl prepared from it
Author name:
حنين فاضل عباس
Supervisor name:
احلام محمد فرحان
General topic:
Chemistry
Specific topic:
Physical Chemistry
Degree:
Master
University:
University of Baghdad - College Of Science For Girls
Language:
Arabic
University location:
Baghdad
First pages:
25T1743 - p.pdf
Abstract:
This study is involved on the preparation of Eucalyptus leaves powder and silver nano particl from Eucalyptus leaves powder and analysis the prepared compound using different techniques, and then study the efficiency of adsorption of the Eucalyptus leaves powder and silver nano particl of Gentain Violet and Fuchsin acid LRThe study includes two parts : - The First part : - Astudy of adsorption aqueous of Gentain Violet and Fuchsin acid LR dyes on Eucalyptus leaves powder , the determine the active group of Eucalyptus leaves powder using FTIR, and after that were followed decdorization removal for dyes(GV, AFD) on surface of Eucalyptus leaves powder through the study spectro and when the different conditions of concentration, acidic function adsorbent dose, temperature equilibrium condition . the result that the higher removal for GV is (88.5) and (90.67)for AFD. The equilibrium data were fitted to the Langmuir, Freundlich and Temkin isotherm, and the result show that the Freundlich isotherm exhibited the most appropriate to predict the experimental results of GVand AFD dyes. For studying the effect of temperature on the adsorption, the thermodynamic parameters such as standard Gibbs free energy change (ΔG ̊), standard enthalpy (ΔH ̊), and standard entropy change (ΔS ̊), have been studied using thermodynamics equation. The thermodynamic analysis of the dyes adsorption GV dye on Eucalyptus leaves powder indicate that the system is non spontaneous and exothermic in nature, while the AFD dye adsorption is spontaneous and exothermic in nature. The effect of ionic strength on adsorption is also studied dy using different concentration (NaCl), it is found that the adsorption of GV is increased with increasing the ionic strength more than the AFD dye with increasing the ionic strength . In order to examine the kinetics of adsorption process two models have been studied, pseudo - first order, pseudo - second order kinetic, it is found the result that the adsorption can fellow more appropriately the pseudo - second order.The Second part : - this part involves preparation of nano silver particles from AgNO3 at different concentration (0.01 and 0.001 M) and three ratio of ELE : AgNO3 (1 : 5, 1 : 6, 1 : 10 ). by using "green synthesis", and analysis the prepared AgNPs from Eucalyptus leaves powder using different techniques, such as X - Ray diffraction study, Atomic Force Microscope, Scanning Electron Microscopy, UV - visible spectrophotometry. The results show that the average particles size rang (80 - 95nm), after that the application for prepared compounds were performed, the aqueous solution of GV and AFD were used as model of waste water to study the adsorption capacity of AgNPs from Eucalyptus leaves powder . The results show that the adsorption capacity of GV and AFD dyes on Eucalyptus leaves powder with AgNPs increased then adsorption of GV and AFD on Eucalyptus leaves powder at equilibrium condition .
