a chitosan–polyaniline magnetic nanocomposite for removing of nitrate from aqueous water

A removing medium based on chitosan– polyaniline (cs–pani) magnetic nanocomposite was synthesized by chemical polymerization of aniline at the presence of chitosan magnetic nanoparticles (cs-mnps). in this work, magnetic nanoparticles, the modified cs-mnps and different types of cs– pani magnetic nanocomposites were synthesized. the efficiency of the cs– pani magnetic nanocomposite was compared with the cs-mnps and fer3ror4r nanoparticles for the remove of nitrate from aqueous samples. the scanning electron microscopy images obtained from all the prepared nanocomposites revealed that the cs–pani magnetic nanocomposite possess more porous structure. among different synthesized magnetic nanocomposites, cs–pani magnetic nanocomposite showed a prominent efficiency. influencing parameters on the morphology of cs–pani magnetic nanocomposite such as weight ratio of components was also assayed.in addition, effects of different parameters influencing the removing efficiency of nitrate including desorption time, amount of sorbent, ionic strength, sample ph were investigated and optimized. under the optimum condition, the removing of nitrate ions at concentration level of 100 ppm was performed using 25 mg of cs– pani magnetic nanocomposite in the ultrasonic system. ionic chromatography analyses of the final aqueous samples indicated that all nitrate was removing from aqueous samples. the whole procedure proved to be conveniently rapid, efficient and economical to removing nitrate from environmental and biological samples.