Adsorption of Chromium from Aqueous Solution Using Polyaniline

Document Type : Research Paper


1 Assist. Prof. of Civil Eng., Faculty of Mechanic and Civil Eng., Islamic Azad University, Khomeinishahr Branch, Isfahan, Iran

2 prof., Faculty of Chemical Eng., Sharif University of Tech., Tehran, Iran

3 Assist. Prof., Faculty of Chemistry, Tabriz University, Tabriz, Iran

4 Assist. Prof., Faculty of Chemistry, Mazandaran University, Babolsar, Iran


 New group of polymers have been synthesized that are conductive of electricity so they are called conducting polymers. One of the most conducting polymers is "polyaniline". In the present study, polyaniline was synthesized by oxidizing aniline monomer under strongly acidic conditions using potassium iodate as an initiator of oxidative polymerization. Synthesized polyaniline as a powder used as an adsorbent to remove chromium from aqueous solution. Experiments were conducted in batch mode with variables such as amount of polyaniline, chromium solution pH and adsorbtion isotherms. Due to presence of Cr (III) in solution after using polyaniline, removal mechanism is the combination of surface adsorption and reduction. It seems that polyaniline reduces the Cr(VI) to Cr(III) and adsorbs the Cr(III) and a part of remaining  Cr(VI). It is well known that nitrogen atom in compounds of amine derivative makes co-ordinate bond with positive charge of metals due to the presence of electron in sp3 orbital of nitrogen. The majority of total chromium removal  occurred at 30minute for polyaniline  and the optimum  time for  hexavalent chromium  removal was about 5 min. Polyaniline has the maximum total cheomiume removal at pH, 3-9. The maximum hexavalent chromium removal occurred at acidic pH for polyanilines. The equilibrium adsorption data for polyaniline fitted both Freundlich’s and Langmuir’s isotherms. This research shows that polyaniline can be used as an adsorbent  for removal chromium from aqueous solution.


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