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Removal of cobalt ion from aqueous solution using magnetic graphene oxide/chitosan composite
Author(s) -
Zhuang Shuting,
Wang Jianlong
Publication year - 2019
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12912
Subject(s) - adsorption , aqueous solution , coprecipitation , freundlich equation , cobalt , chitosan , graphene , langmuir , materials science , oxide , endothermic process , langmuir adsorption model , composite number , cobalt oxide , chemical engineering , nuclear chemistry , inorganic chemistry , chemistry , composite material , nanotechnology , metallurgy , organic chemistry , engineering
The magnetic graphene oxide (GO)/chitosan composite was prepared, characterized, and applied for the removal of cobalt ions from aqueous solutions. One‐step coprecipitation method was used to synthesize magnetic GO/chitosan beads, which were characterized by VMS, FTIR, SEM, and EDX. The composites show a good porous structure and magnetic separation ability. The adsorption process is endothermic (ΔH 0 = 12.08 kJ mol −1 ) and pH in the range of 5–9 has a slight effect on Co 2+ adsorption. The adsorption kinetic data could be fitted with the pseudo‐second‐order model (R 2 = 0.995) best, followed by the intraparticle diffusion (R 2 = 0.950) and pseudo‐first‐order (R 2 = 0.943) models. In addition, the Langmuir model (R 2 = 0.995) was better at fitting the adsorption equilibrium data than that of the Freundlich (R 2 = 0.814) and the Temkin (R 2 = 0.806) models. The maximum adsorption capacity (q m ) was calculated to be 15.24 mg·g −1 based on the weight of chitosan and GO by the Langmuir model. The magnetic GO/chitosan composite beads can be used for the removal of cobalt ions from aqueous solutions. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S32–S41, 2019