P S Jassal
University of Delhi, India
Title: Nanochitosan for toxic metals adsorption from waste water
Biography
Biography: P S Jassal
Abstract
Chitosan nanoparticles synthesized by the ionic gelation technique by crosslinking the crab shell chitosans with polyanion, sodium tripolyphosphate (TPP) in the ratio of 1:3 (CS/TPP). 0.5 g chitosan dissolved in 20 ml acetic acid was stirred with cross-linking agent for 24 hours. The settled precipitate is crushed and stored in glass tubes for further use. Adsorption was carried out with 50 ml of metal solution added with 0.013 g chitosan nanoparticles and estimation was done by using hanging mercury drop electrode (HMDE) with 797 VA Computrace. The thermogravimetric analysis (TGA) for pure crab shell chitosan shows three weight losses one before 202, second after 250 and another after 380 in polymer mass. Chitosan nanoparticles indicate that first thermal event occur at temperature range 50-150, the second degradation stage occur in range of 200-530. The crystalline behaviour and size of particles is determined using XRD studies. The XRD spectrum of nanochitosans shows a broad peak around 2 theta 20.13°. The pure chitosan shows a peak at around 2 theta 19.7 degrees. In Fourier transform infrared spectroscopy (FTIR) for crab shell chitosan spectrum, a band appears at 3430.58 cm-1 was attributing to the -OH and -NH2 groups attributing to stretching vibrations. In nano chitosan a shift from 3430.58 cm-1 to 3436.06 cm-1 was recorded. The SEM images of nano chitosan reveal a spherical shape and chitosan has relatively a rough and uneven structure which exhibited amorphous feature. Studies result show remarkable lowering of toxic metals ion concentration i.e. Cr (VI), Co (II), Ni (II) etc., from the industrial waste.