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<p>In this study, an amphoteric hydrogel composed of sodium Polyacrylate and cetyltrimethylammonium bromide (CTAB) was synthesized and evaluated for the adsorption of both cationic and anionic dyes from aqueous solutions. Three different CTAB concentrations (5%, 12.5%, and 25% w/w) were used to investigate the effect of CTAB on adsorption performance of the resulting hydrogel. Instrumental analysis confirmed the successful incorporation of CTAB into the polymer matrix, with porous and rough morphology. Modified hydrogel with 12.5% CTAB was the optimum one for further investigation. The optimized hydrogel exhibited high adsorption capacities for Methylene Blue (MB; 197.8&#xa0;mg·g⁻¹) and Congo Red (CR; 170&#xa0;mg·g⁻¹). Adsorption was rapid within the first hour, reaching equilibrium after ~ 2&#xa0;h for MB and ~ 4&#xa0;h for CR. Maximum uptake occurred at an adsorbent dose of 1.25&#xa0;g/L for both dyes and the process followed the Freundlich isotherm and pseudo-second-order kinetics models. In the binary dye system, the hydrogel effectively removed both MB and CR simultaneously. The material also demonstrated excellent reusability, maintaining over 90% of its initial adsorption capacity after five successive adsorption–desorption cycles. Furthermore, it exhibited pronounced antimicrobial activity against <i>Staphylococcus aureus</i>, <i>Salmonella typhimurium</i>, and <i>Candida albicans</i>, with inhibition zones of 16, 29, and 30&#xa0;mm, respectively. Based on these findings, the prepared hydrogel is expected to be a promising material for removing both cationic and anionic dyes from dyeing effluents, as well as inhibiting the growth of pathogenic bacteria.</p>

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Amphoteric hydrogel based on sodium polyacrylate and cetyltrimethylammonium bromide for efficient adsorption of cationic and anionic dyes with antimicrobial properties

  • 期刊论文

  • 发表日期：

    2026年1月17日

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  • Heba Kandil,
  • Shaimaa A. Nour,
  • Ahmed E. Abdelhamid

摘要

In this study, an amphoteric hydrogel composed of sodium Polyacrylate and cetyltrimethylammonium bromide (CTAB) was synthesized and evaluated for the adsorption of both cationic and anionic dyes from aqueous solutions. Three different CTAB concentrations (5%, 12.5%, and 25% w/w) were used to investigate the effect of CTAB on adsorption performance of the resulting hydrogel. Instrumental analysis confirmed the successful incorporation of CTAB into the polymer matrix, with porous and rough morphology. Modified hydrogel with 12.5% CTAB was the optimum one for further investigation. The optimized hydrogel exhibited high adsorption capacities for Methylene Blue (MB; 197.8 mg·g⁻¹) and Congo Red (CR; 170 mg·g⁻¹). Adsorption was rapid within the first hour, reaching equilibrium after ~ 2 h for MB and ~ 4 h for CR. Maximum uptake occurred at an adsorbent dose of 1.25 g/L for both dyes and the process followed the Freundlich isotherm and pseudo-second-order kinetics models. In the binary dye system, the hydrogel effectively removed both MB and CR simultaneously. The material also demonstrated excellent reusability, maintaining over 90% of its initial adsorption capacity after five successive adsorption–desorption cycles. Furthermore, it exhibited pronounced antimicrobial activity against Staphylococcus aureus, Salmonella typhimurium, and Candida albicans, with inhibition zones of 16, 29, and 30 mm, respectively. Based on these findings, the prepared hydrogel is expected to be a promising material for removing both cationic and anionic dyes from dyeing effluents, as well as inhibiting the growth of pathogenic bacteria.