A composite polymer, hydroxyapatite/poly(acrylamide-acrylic acid), was synthesized by gamma-induced polymerization. The factors affecting the sorption process were evaluated. The removal increased with time and achieved equilibrium after 1 h for all initial concentration ranges (10–50 mg/L). The highest removal of Sr(II) was achieved using 50 mg/L at pH 6. The sorption process was found to follow a pseudo-first-order mechanism. The equilibrium data are best described by the Langmuir model, with a monolayer capacity of 53.59 mg/g. The values of thermodynamic parameters indicate that the sorption process is endothermic (ΔH > 0), increases randomness (ΔS > 0) and is spontaneous (ΔG < 0). The results imply that the composite could be used as a promising low-cost material for the removal of radionuclides from radioactive waste.
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• A polymeric composite material, hydroxyapatite/poly (acrylamide-acrylic acid) was synthesized by gamma-induced polymerization.
• Feasibility of using the prepared polymeric material for the removal of hazardous materials such as Sr(II) was evaluated.
• The monolayer capacity of the prepared composite is 53.59 mg/g.
• Ion exchange was proved to be the dominant mechanism and thermodynamic parameters indicated that the sorption is an endothermic and spontaneous process.
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Hassan, H.S., El-Kamash, A.M. & Ibrahim, H.A. Evaluation of hydroxyapatite/poly(acrylamide-acrylic acid) for sorptive removal of strontium ions from aqueous solution. Environ Sci Pollut Res 26, 25641–25655 (2019). https://doi.org/10.1007/s11356-019-05755-1
- Radiation-induced polymerization
- Hydroxyapatite/poly(acrylamide-acrylic acid) composite
- Sr(II) removal