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<p>In the present work, about their effect on the removal of nickel (Ni) and cobalt (Co) from water using anionic polyacrylamide (APAM), we assessed the chemical behavior of the polymer in terms of swelling. The swelling phenomenon is related to the initial concentration of the heavy metals. The time-dependent swelling process followed second-order kinetics and was influenced by non-Fickian mechanisms. Under optimized conditions (pH 6, 50°C, 250 mg/L initial concentration, and 180 min of contact time), the maximum adsorptive capacities for Ni and Co of APAM were 230 mg/g and 210 mg/g, respectively. Moreover, it was revealed that the adsorption process was highly sensitive to several factors, such as temperature, pH, and initial concentration. The adsorption of metals onto APAM was well described using the Langmuir isotherm model, implying a homogenous propagation of the adsorptive sites, while our experimental data were most accurately represented by the pseudo-first-order kinetic model. The present study unfolds an excellent opportunity for APAM to serve as a reliable sorbent for the removal of heavy metals from water and brings invaluable information on the nature of the underlying mechanisms and influencing factors.</p>

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Investigation of polyacrylamide as potential adsorbent for efficient heavy metal removal: insights into the swelling mechanism, adsorption isotherms, and kinetics

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Imane lebkiri,
  • Brahim Abbou,
  • Abdelhay El Amri,
  • Abdelkarim Ouass,
  • Jaouad Bensalah,
  • Otmane Mqadmi,
  • Lamya Kadiri

摘要

In the present work, about their effect on the removal of nickel (Ni) and cobalt (Co) from water using anionic polyacrylamide (APAM), we assessed the chemical behavior of the polymer in terms of swelling. The swelling phenomenon is related to the initial concentration of the heavy metals. The time-dependent swelling process followed second-order kinetics and was influenced by non-Fickian mechanisms. Under optimized conditions (pH 6, 50°C, 250 mg/L initial concentration, and 180 min of contact time), the maximum adsorptive capacities for Ni and Co of APAM were 230 mg/g and 210 mg/g, respectively. Moreover, it was revealed that the adsorption process was highly sensitive to several factors, such as temperature, pH, and initial concentration. The adsorption of metals onto APAM was well described using the Langmuir isotherm model, implying a homogenous propagation of the adsorptive sites, while our experimental data were most accurately represented by the pseudo-first-order kinetic model. The present study unfolds an excellent opportunity for APAM to serve as a reliable sorbent for the removal of heavy metals from water and brings invaluable information on the nature of the underlying mechanisms and influencing factors.