Removal of hexavalent chromium in water samples by using magnetic nanoparticles modified with chitosan by experimental design optimization approach

Due to rapid industrialisation, the presence of heavy metals in water and wastewater is a matter of environmental concern. Though some of the metals are essential for our system but if present beyond their threshold limit value, they are harmful and their treatment prior to disposal becomes inevitable. Now days nanoparticles and nano absorbents are turned out to have variety of application in extraction of heavy metals. In this research, magnetic solid phase extraction using iron oxide nanoparticles, coated with chitosan for extraction and removal of hexavalent chromium in water samples was used. Unique feature of Fe3O4 magnetic nanoparticles resubbing high surface area, and high magnetic power has been used efficiently in magnetic solid phase extraction. Chitosan particles were obtained from shrimp shells wastes and physicochemically characterized. Nanoparticles to investigate morphology and nature of nanoparticles, X -ray diffraction, scanning electron microscope, thermal gravimetric analysis, X-ray photoelectron spectroscopy and other techniques to characterization, were used. Different parameters of extraction and removal of chromate for magnetic solid phase extraction using iron oxide nanoparticles coated with chitosan were investigated and refined by using central composite design method. Analytical application and functions of proposed method in optimum condition for extraction and removal of hexavalent chromium from water and industrial wastewater samples were investigated.

Keywords:

Hexavalent Chromium , Removal , Magnetic Nanoparticles , Chitosan