Part I: Removing of Zn(II) from Polluted Water: Determination of Precipitation Limit Of Zn(II) Ion With 2-Hydroxy-1,2,3-Propanetricarboxylic Acid

Abstract

<b>Problem statement:</b> The goal of this research was to investigate the condition for removing of Zn cation from water, through precipitation method with 2-hydroxy-1,2,3-propanetricarboxylic acid as ligand. <b>Approach:</b> In this study we examined the precipitation of Zn(II) ion in water solutions of ZnSO₄ × 7H₂O (1×10^-2 and 5×10^-3 mol L^-1) with 2-hydroxy-1,2,3-propanetricarboxylic acid (1×10^-1-1×10^-3 mol L^-1) in constant ionic strength of 0.6 mol L^-1 NaCl. We have determined the concentration region at which Zn(II) start to precipitate. <b>Results:</b> From precipitation diagrams of zinc with 2-hydroxy-1,2,3-propanetricarboxylic acid, in ionic force 0.6 mol L^-1 NaCl, we have found that during decreasing the concentration of 2-hydroxy-1,2,3-propanetricarboxylic acid, in case of constant concentration of Zn(II), the limit of precipitation is shifted to lower values of pH. The solid phase is analyzed by IR spectroscopy. <b>Conclusion:</b> From the IR spectroscopic analysis we can conclude that Zn(II) ion can precipitate with 2-hydroxy-1,2,3-propanetricarboxylic acid

Thermodynamic Characteristics of Camel's Urine as an Inhibitor for Mild Steel in 1.5 M H₂SO₄ Acid Solution

“…8) and transition state equation (Eq. 9) (Faiku et al, 2010): ∆ are the apparent activation energy, the enthalpy of activation and the entropy of activation. A is the frequency factor which has the same unit as that of the corrosion rate.…”