Removal Of Cadmium From Aqueous Solutions Using Β-Cyclodextrin Graphene Oxide Adsorbent

Nowadays water pollution with heavy metal is one of the main concerns in the pollutionmanagement.In the modern world, with the intensive growing industrialization, toxic heavy metalsare used extensively and it seems very unlikely that can be avoided. These materials have greatlyaffected people’s health.One of the most toxic heavy metals is Cadmium which even at very lowdosages may cause oxidative DNA damage leading to mutations and cancer initiation. Adsorption isthe most common method for trapping heavy metal cautions since it is easily available and benefitsfrom low energy consumption. One of the novel compounds which is highly explored as adsorbentplatform is graphene oxide (GO). The surface area of GO contains many polar groups such ashydroxyl, epoxy, carbonyl and carboxyl, making GO a good chemical reactant and superb platformsorbent for organic dyes or heavy metal ions. Besides, on the basis of the previous study, weassumed that grafting β-cyclodextrin (β-CD) onto GO may produce a conjugate with excellentabsorption capacity. In this research , first we functionalized graphene oxide with β-cyclodextrinand confirmed the successful synthesis of β-CD-GO by series of analysis such as Fourier transforminfrared spectroscopy (FTIR), TEM and thermo gravimetric analysis(TGA), then the modifiedgraphene oxide was used to investigate adsorption of Cd+2 ion in aqueous solutions. The effects ofvarious experimental parameters such as initial pH, initial metal ion concentration, adsorbentdosage and contact time on the sorption process were also study. The absorption data showed theoptimum pH for β-CD-GO was considered at PH=11. Kinetics of adsorption, isotherm studies andthermodynamics analysis were studied. The adsorption experimental data is well fitted with thepseudo-second-order model and Freundlich isotherm models. The importance of these results isdue to developing an efficient material for the removal of metals and pollutants from water. Theresults of this work confirmed that β-CD-GO is a powerful and promising candidate for adsorption ofheavy metal from wastewater.