Synthesis and Characterization of Polyaniline/Chitin (Squid Pens) for the Removal of Chromium (VI) from Aqueous Solution

  • Siti Nor Atika Baharin Universiti Teknologi MARA
  • Hafiz Istamam Universiti Teknologi MARA
  • Nur Farahin Suhaimi Universiti Teknologi MARA
  • Nurul’ Ain Jamion Universiti Teknologi MARA
  • Muggundha Raaov Universiti Teknologi MARA
  • Kavirajaa Pandian Sambasevam Universiti Teknologi MARA
Keywords: Heavy metal; polyaniline; squid pens; removal; chitosan; chromium


The rapid growth of the industrial sector has contributed to the increasing amount of heavy metal waste in  environmental water bodies. It has become a critical  situation in many developing countries. Among the heavy metals, chromium (Cr) (VI) has been studied extensively due to its toxic nature in  aqueous solution. Recently, bio-conducting polymers have been reported to be successful in removing heavy metals from aqueous solutions. In this study, chitin was extracted from squid pens and integrated with polyaniline (PANI) via a chemical oxidative method. The integration of chitin with PANI was confirmed by Fourier Transform Infrared (FTIR) spectroscopy, which indicated that the essential peaks of both chitin and PANI were present in the PANI/chitin composites. The removal of Cr (VI) was evaluated by Atomic Absorption Spectroscopy (AAS). Several removal optimizations were made by evaluating the effects of pH, contact time, and mass of adsorbent. The results revealed that PANI/chitin removed the highest percentage of Cr (VI) at pH 3, with 12 minutes of contact time and 20 mg of the adsorbent in a  solution with an initial concentration of 10 ppm Cr (VI) at 298.15 K.