Integrated Approach on Synthesis and Characterization Of Industrial Agro Waste Nanocomposite for Water Treatment

Abstract

Toxic heavy metals when discharged into water resources are serious threat to environment and human health due to which it is important to remove them from industrial waste water. Adsorption mechanism serves as a good option for the removal of heavy metals. In the present study various nanocomposites are synthesized by using different agriculture waste (wheat straw, coconut husk) and industrial waste materials (biomass ash) and utilized for the removal of selected heavy metals [Cu(II) and Cr(VI)] from waste water. newline In the present work, Chitosan grafted Biomass ash on Graphene oxide base nanocomposite adsorbent (Cs-g-BA/GO) is synthesized. The results showed that Cs-g-BA/GO nanocomposite is an efficient adsorbent with maximum removal efficiency of 80.0 % for Cu(II) and 82.6 % for Cr (VI) at pH 4.5 and 5 with adsorbent dose of 0.12g/l in 90 mins respectively. newline A new sorbent material namely Guar Gum-g-Coconut husk (SnO2-SiO2) [GG-g-CH(SnO2-SiO2)] nanocomposite was synthesized by preparation of coconut husk metal oxide nanoparticles and grafted into acrylamide modified Guar gum (GG) base with the help of crosslinking agent Glutaraldehyde. Its adsorption capacity was evaluated for the adsorption of Cu (II) and Cr (VI) metal ions from waste water and the maximum percent removal achieved was 99% for Cu (II) and 92.74 % Cr (VI) at a pH of 8.3 and 7.2 respectively with adsorbent dose of 250 mg/l in 120 mins. newline In this study, Wheat straw were used as a source of cellulose which were separated and polymerized with PVA/AM by redox initiator system. The maximum percent removal obtained are 99.06 % for Cu(II) and 94.74 % Cr(VI) at pH of 5.7 and 3.7 with optimum adsorbent dose of 300 mg/l at 90 mins and 60 mins for Cu(II) and Cr(VI) respectively. At the end PVA/AM-g-WSC hydrogel nanocomposite is found to be efficient adsorbent for the removal of Cu(II) and Cr(VI) metal ions present in waste water.