2-Acrylamide-2-Methyl Propane Sulfonic Acid Hydrogels; Preparation, Characterization, and Removal of Heavy Metals Pb2+ and Cu2+from Wastewater

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Document Type : Research Article

Authors

1 Department of Chemical Engineering, Islamic Azad University, Ahar Branch, Ahar, Iran

2 Department of Chemistry, Ahar Branch, Islamic Azad University, Ahar, Iran

Abstract

The study's aim was the preparation and characterization of 2-acrylamide-2-methylpropanesulfonic acid (AMPS) hydrogels for the removal of the heavy metals lead (Pb2+) and copper (Cu2+) from wastewater. AMPS hydrogels were prepared by the method of free radical polymerization at 70℃ for six hours. Potassium persulfate (KPS) was used as the initiator and N, N'-methylene-bis-acrylamide as crosslinking agent. The swelling properties of the hydrogels were investigated under different conditions, such as temperature, ionic strength, and pH. NaOH neutralized AMPS in 50%, 65%, and 75% w/w. The AMPS monomer showed absorbance at 229 nm in the U-Vis spectrophotometer. After neutralization, absorbance was found at 203, 213, and 200 nm for 50%, 65%, and 75% w/w solution, respectively. This study showed robust, complex formation between SO3- and Na+. The maximum swelling of AMPS hydrogels was determined to be 16000% in 65% w/w NaOH and pH=7. The swelling behavior of hydrogels was investigated at 25°C, 50°C, and 75°C. The maximum swelling was 220%, which was observed at 75°C. To investigate the effect of ionic strength on the swelling of the hydrogel, NaCl and KCl were used in different molar concentrations. In this study, the swelling properties were higher at 0.00001M than at 0.001 M. Fourier transform infrared (FT-IR) and thermal gravimetric analysis (TGA) were used to characterize the structural and thermal properties. Atomic absorption spectroscopy was performed to evaluate the removal of heavy metals (Cu2+ and Pb2+) in wastewater. Morphological analysis was performed using scanning electron microscopy (SEM).

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Iranian Journal of Chemistry and Chemical Engineering

Articles in Press, Accepted Manuscript
Available Online from 01 January 2024

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