Abstract
Chitosan a natural linear bio-poly amino saccharide is extensively used for the removal of heavy metals. Brassica Gongylodes a native of Northern Europe is reported to be rich in polyphenols and flavonoids. In present study a novel green nanocomposite has been developed by combining chitosan and Brassica Gongylodes leaf extract. Freshly prepared chitosan nanoparticles embedded with Brassica Gongylodes leaf extract. Developed green nanocomposite was investigated as bio adsorbent for the removal of mercury metal from simulated waste water. Physico-chemical, morphological and elemental characterization of prepared green nanocomposite prior to adsorption was commenced using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscope coupled with Energy dispersive x-ray (SEM-EDX) techniques. SEM studies confirm the formation of nanoparticles of chitosan. EDX analysis indicated the presence of new and change in concentration of many compositional elements. In diffractrogram of chitosan nanoparticles impregnated with Brassica Gongylodes leaf extract several diffraction peaks of high angle were observed which were missing in the nanoparticles of chitosan diffractrogram. Batch adsorption results revealed that maximum adsorption of mercury was found with 50 mg of adsorbent when contact time was 45 min at 10 pH. In thermodynamic studies it has been found that process is spontaneous and feasible. For kinetic studies different kinetic parameters, equilibrium sorption capacities, rate constants, and related correlation coefficients were calculated. Result shows that adsorption process could be best defined by the pseudo second order kinetic equation which suggests that adsorption process is carried out probably by chemisorption. Thus study shows that chitosan nano composite embedded with Brassica Gongylodes leaf extract is a promising adsorbent for mercury adsorption from simulated wastewater.
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