Preparation And Application Of An Amine Carboxylase-typ Chelating Fiber

In this paper,amine carboxylase-type chelating fiber was prepared by a new method,that the chloromethylated styrene-grafted of polypropylene fiber substrate was aminated with N,N-dimethyl-aniline firstly,and then was reacted with iminodiacetic sodium.The factors affected the synthesis of amine carboxylase-type chelating fiber was discussed to win the best conditions for the synthesis of the chelating fiber.The styrene-grafted polypropylene fiber substrate,chloromethylated styrene-grafted polypropylene fiber substrate,amine carboxylase-type chelating fiber and the chelating fiber after adsorption of the heavy metal ions were characterized by SEM,FT-IR spectroscopy,and thermogravimetric analysis.The results of the experiment were as follows:the total exchange capacity of amine carboxylase-type chelating fiber was 4.49mmol/g,the acid exchange capacity was 2.93mmol/g,and the alkali exchange capacity 1.49mmol/g.And the amine carboxylase-type chelating fiber had great capacity of exchange and excellent performance.The amine carboxylase-type chelating fiber was used to adsorption of Cu²⁺,Ni²⁺,Pb²⁺,Cd²⁺.The influence of pH,the initial concentration,and change of time on the adsorption process was investigated.The results were as follows:the amount of saturation adsorption of Cu2+,Ni2+,Pb2+Cd2+ were 16.91mg/g,9.79mg/g,22.21mg/g,11.99mg/g.Therefore,the amine carboxylase-type chelating fiber had a good selection of adsorption toward divalent metal ions,an extremely fast adsorption rate,and a very high adsorption capacity,the adsorption isotherm was well described by Freundlich,and the adsorption kinetic was matched with the Lagergren model.Also,the amine carboxylase-type chelating fiber with good regenerative capacity could be used repeatedly after regeneration.