PRECONCENTRATION OF Ni (II) ION FROMAQUEOUS SOLUTIONS BY MODIFIED SYNTHETICCOPOLYMER WITH ADSORPTION ISOTHERMSTUDIES

This work is dedicated to adsorption study of Ni (II) ions by synthetic adsorbent based on maleic anhydride styrene copolymer and 1,4-bis[2-(prop-1-enil) fenoksi]butan modified with N, N'-diisopropyl thiourea.During work different parameters affecting adsorption process were investigated: influence of pH, contact time, ionic strength and initial metal ion concentration.It was found that maximum adsorption capacity is observed at pH=3 and is equal to 19.5 mg/g.In order to describe adsorption process different adsorption isotherm models were studied and the results were found to be consistent with the Langmuir model.Dubinin-Raduskhevic model was investigated to show that physical adsorption takes place in the system adsorbent-adsorbate.The present work also includes desorption studies.