Adsorption of selenium using poly(1,8-diaminonaphtalene synthesızed by chemical oxidation

In the present work, poly(1,8-diaminonapthalene) ((poli(1,8-DAN)) was synthesized by the reaction of 1,8-diaminonapthalene monomer with ammonium persulfate in acetonitrile and it was used in the adsorption of selenite ions in aqueous phase. The polimer samples were synthesized at different mole ratios of 1,8-diaminonaphthalene (monomer) to ammonium persulfate (oxidant) which were 1/0.25; 1/0.5; 1/1; 1/2 ve 1/4.The effects of acidity and initial concentration on the adsorption of Se(IV) ions were examined for the polymer samples prepared at the different molar ratios. The optimum acidity was found to be 6 M HCl and the optimum molar ratios were found to be 1/0.5 and 1/2 for the adsorption. The data obtained from the adsorption studies at different initial concentrations were applied to the Langmuir and Freundlich isotherms. The maximum adsorption capacities of poli(1,8-DAN) samples at the 1/0.5 and 1/2 molar ratios were found to be 75.19 and 45.05 mg Se/g, respectively. It was concluded that the adsorption mechanisms were governed by ionic interaction (>NH2+SeOCl3-) and piazoselenol type binding (-N=Se=N-).