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<p>In response to the critical need for selective and efficient bromate (BrO₃⁻) remediation, this study reports the design and synthesis of a novel hybrid polymer adsorbent, PVP-g-MPS@HEMA, fabricated by grafting 4-vinylpyridine (4-VP) onto methacrylate propyltrimethoxysilane (MPS)-modified hydroxyethyl methacrylate (HEMA). The innovation lies in the integration of nitrogen-rich pyridine moieties and silane-modified backbones, offering enhanced affinity, stability, and reusability. Structural and compositional features were verified via FTIR, XRD, TGA, and XPS, confirming successful grafting and functionalization. Under optimized conditions (C₀ = 0.05&#xa0;mg/L, adsorbent dose = 0.01&#xa0;g, pH = 3, T = 318&#xa0;K, contact time = 10&#xa0;min), the polymer achieved a maximum BrO₃⁻ removal efficiency of 98.75%. The kinetic data best fit a pseudo-second-order model (R² = 0.9807), indicating that chemisorption is the rate-limiting step. Isotherm studies showed superior fit with the Freundlich (R² = 0.9948) and Redlich–Peterson (R² = 0.9931) models, indicating multilayer adsorption on a heterogeneous surface, with an estimated qₘ = 0.593&#xa0;mg/g from a Langmuir fit. Thermodynamic parameters (ΔG° &lt; 0, ΔH° = +47.61&#xa0;kJ/mol, ΔS° &gt; 0) indicate a spontaneous, endothermic adsorption process that is enhanced at higher temperatures. Furthermore, the adsorbent exhibited strong reusability, maintaining 94.4% efficiency after five adsorption–desorption cycles using 1&#xa0;M NaOH as eluent. The polymer’s BET surface area (45.6&#xa0;m²/g) and pore volume (0.1341&#xa0;cc/g) further support its high adsorption capacity. This work introduces PVP-g-MPS@HEMA as a scientifically innovative and practically viable material for rapid, selective, and regenerable bromate removal, contributing to the development of advanced functional materials for next-generation water purification systems.</p>

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Enhanced Removal of Toxic Bromate from Water Using a Novel 4-Vinylpyridine-Grafted Methacrylate-Modified HEMA Polymer

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Abdullah M. Aldawsari,
  • Ibrahim Hotan Alsohaimi,
  • Mosaed S. Alhumaimess,
  • Mohammad S. Algamdi,
  • Ayoub Abdullah Alqadami,
  • Yasser A. El-Ossaily,
  • Mohamed Y. El-Sayed,
  • Fan Zhang,
  • Hassan M. A. Hassan

摘要

In response to the critical need for selective and efficient bromate (BrO₃⁻) remediation, this study reports the design and synthesis of a novel hybrid polymer adsorbent, PVP-g-MPS@HEMA, fabricated by grafting 4-vinylpyridine (4-VP) onto methacrylate propyltrimethoxysilane (MPS)-modified hydroxyethyl methacrylate (HEMA). The innovation lies in the integration of nitrogen-rich pyridine moieties and silane-modified backbones, offering enhanced affinity, stability, and reusability. Structural and compositional features were verified via FTIR, XRD, TGA, and XPS, confirming successful grafting and functionalization. Under optimized conditions (C₀ = 0.05 mg/L, adsorbent dose = 0.01 g, pH = 3, T = 318 K, contact time = 10 min), the polymer achieved a maximum BrO₃⁻ removal efficiency of 98.75%. The kinetic data best fit a pseudo-second-order model (R² = 0.9807), indicating that chemisorption is the rate-limiting step. Isotherm studies showed superior fit with the Freundlich (R² = 0.9948) and Redlich–Peterson (R² = 0.9931) models, indicating multilayer adsorption on a heterogeneous surface, with an estimated qₘ = 0.593 mg/g from a Langmuir fit. Thermodynamic parameters (ΔG° < 0, ΔH° = +47.61 kJ/mol, ΔS° > 0) indicate a spontaneous, endothermic adsorption process that is enhanced at higher temperatures. Furthermore, the adsorbent exhibited strong reusability, maintaining 94.4% efficiency after five adsorption–desorption cycles using 1 M NaOH as eluent. The polymer’s BET surface area (45.6 m²/g) and pore volume (0.1341 cc/g) further support its high adsorption capacity. This work introduces PVP-g-MPS@HEMA as a scientifically innovative and practically viable material for rapid, selective, and regenerable bromate removal, contributing to the development of advanced functional materials for next-generation water purification systems.