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

Author:
Algothmi, Wafa M., Bandaru, Narasimha Murthy, Yu, Yang, Shapter, Joseph G., Ellis, Amanda V.
Source:
Journal of colloid and interface science 2013 v.397 pp. 32-38
ISSN:
0021-9797
Subject:
Fourier transform infrared spectroscopy, adsorbents, adsorption, aqueous solutions, calcium alginate, copper, encapsulation, equations, gels, graphene oxide, ions, scanning electron microscopy, sorption isotherms, thermogravimetry
Abstract:
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.
Agid:
1009071