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Alginate–graphene oxide hybrid gel beads: An efficient copper adsorbent material

Algothmi, Wafa M., Bandaru, Narasimha Murthy, Yu, Yang, Shapter, Joseph G., Ellis, Amanda V.
Journal of colloid and interface science 2013 v.397 pp. 32-38
Fourier transform infrared spectroscopy, adsorbents, adsorption, aqueous solutions, calcium alginate, copper, encapsulation, equations, gels, graphene oxide, ions, scanning electron microscopy, sorption isotherms, thermogravimetry
Here we report on the adsorption performance of calcium alginate (Ca-Alg₂) and Ca-Alg₂ with encapsulated graphene oxide (Ca-Alg₂/GO) gel bead adsorbents for the successful removal of Cu²⁺ ions from aqueous solution. Different adsorbent doses, Cu²⁺ concentrations and contact times were investigated using equilibrium and kinetic studies. The adsorbents were characterized using Fourier transform-infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and focussed ion beam scanning electron microscopy (FIB/SEM). The equilibrium adsorption data were fitted to Langmuir isotherms and the maximum adsorption capacities of the Ca-Alg₂ and Ca-Alg₂/GO gel beads were found to be 42.7mgg⁻¹ and 60.2mgg⁻¹, respectively. The equilibrium adsorption data were fitted to a pseudo-second-order kinetic equation showing that the Ca-Alg₂ gel beads had a higher kinetic adsorption rate at 0.0425gmg⁻¹min⁻¹ compared to Ca-Alg₂/GO at 0.0179gmg⁻¹min⁻¹.