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This work describes the investigation of applicability of Sulfonated Glycidylmethacrylate (GMA) grafted non-woven polyethylene (PE) adsorbent for the efficient removal of uranium from aqueous solutions. The adsorbent film was prepared by the gamma radiation (pre-radiation) technique of GMA grafting onto non-woven PE and the epoxide group of GMA converted to sulfonic acid by sulfonation. The uranium loading capacity of the sorbent was investigated with different parameters contact time, initial uranium concentration, pH and temperature. The kinetics of the monolayer sorption was evaluated by pseudo-first-order and pseudo-second-order equations. The uranium loading capacity depends on temperature. At 25 °C the value of ∆G is − 0.74 kJ mol−1 and at higher temperature it is also negative, indicates that the sorption process is spontaneous and thermodynamically favorable. The experimental data fitted best with the Langmuir isotherm model and the deliberate sorption capacity were 181.82 mg g−1. [ABSTRACT FROM AUTHOR]

Voltammetric behaviors of copper (II) complex with nitrogen bearing nucleobase, thymine (C5H6N2O2), was studied using cyclic voltammetry (CV) on a glassy carbon electrode. Assessment of the chemical and physical conditions that may favor optimum current enhancement was done by studying the effect of variation of concentration of metal and ligand ions, scan rate, step height, pH values and supporting electrolyte as (NH4)2SO4, KCl and NaCl. It was observed that copper and thymine forms a 1:1 ratio complex and increasing the concentration of either metal ion or ligand ion increases the corresponding current. Increasing the scan rate increases the corresponding current linearly with the square root of the scan rate. As the step height decreases the peaks become sharper. Anodic and cathodic current increases linearly with decreasing step height. The highest degree of complexation was observed at pH ranging from 2.3 to 7.0. However, poor complexation was observed in slightly alkaline medium. The complexing order trend of supporting electrolytes was observed as (NH4)2SO4>NaCl>KCl. [ABSTRACT FROM AUTHOR]

Voltammetric behaviors of Copper (II) nitrogen bearing nucleobases, such as Guanine (C5H4N5O2) was studied in electro analyzer using cyclic voltammetry (CV) on a Glassy Carbon Electrode. Assessment of the chemical and physical conditions that may favor optimum current enhancement was done by studying the effect of variation of concentration of metal and ligand ions, variation of scan rate, variation of step height, variation of pH values, and variation of supporting electrolyte as (NH4)2SO4, KCl, and NaCl. It was observed that Copper and Guanine forms a 1 : 2 ratio complex. The work reflects that increasing the concentration of either metal ion or ligand ion increases the corresponding current. Increasing the scan rate increases the corresponding current linearly with the square root of the scan rate. As the step height decreases the peaks become sharp. Anodic and cathodic current increases linearly with decreasing step height. For the complex mixture the complexation occurs maximum at a pH of 2.3-7.0 and is badly restricted in the slightly alkaline medium and the complexing order of the supporting electrolyte showed a trend as (NH4)2SO4 > NaCl > KCl. [ABSTRACT FROM AUTHOR]