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<p>Adsorption using polymeric membranes is an efficient method for removing heavy metals from wastewater. Poly(vinyl alcohol) (PVA) is a promising polymer for this application. However, the virgin PVA has two main limitations: low water stability and poor adsorption capacity. Various approaches were employed to enhance the adsorption capacity of PVA membranes, including blending with other polymers that possess superior adsorption capacity or fabricating composites incorporating fillers with adsorption capabilities. This research introduces a new approach: performing simultaneous amino functionalization and crosslinking in a single and simple reaction to improve its adsorption capacity and water stability. Novel PVA-based membranes were prepared with crosslinking by L-glutamic acid (Glu) and increasing porosity by poly(ethylene glycol) (PEG). The morphology of the obtained membranes was investigated through SEM. The structure of the membranes was characterized by FTIR. The XRD analysis was used to determine the crystallinity index, and its changes were further confirmed by DSC analysis and the Swelling degree. The improvement of water stability was verified through Swelling degree and Gel content measurement. The membrane’s adsorption performance was evaluated in copper (II) sulfate solutions. The optimal adsorption conditions for the obtained membranes were determined as a function of pH, temperature, adsorbent dose, initial concentration, and contact time. Under the optimum conditions, the adsorption capacity (Qe) reached the maximum value of 51.96&#xa0;mg/g, approximately 10 times higher than that of the parent PVA membrane.</p>

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Optimization of copper removal capacity and stability in aqueous media for poly(vinyl alcohol) membranes by directly modifying the structure

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Le Hanh Trang Ho,
  • Nam Truong Hoai,
  • Nam Trung Vu,
  • Quynh Le Thi Thuy,
  • Trong Huy Tran,
  • Huyen Doan Thi Hoa,
  • Tung Huy Nguyen,
  • Sarawut Rimdusit,
  • Panuwat Luengrojanakul,
  • Thuy Tran Thi

摘要

Adsorption using polymeric membranes is an efficient method for removing heavy metals from wastewater. Poly(vinyl alcohol) (PVA) is a promising polymer for this application. However, the virgin PVA has two main limitations: low water stability and poor adsorption capacity. Various approaches were employed to enhance the adsorption capacity of PVA membranes, including blending with other polymers that possess superior adsorption capacity or fabricating composites incorporating fillers with adsorption capabilities. This research introduces a new approach: performing simultaneous amino functionalization and crosslinking in a single and simple reaction to improve its adsorption capacity and water stability. Novel PVA-based membranes were prepared with crosslinking by L-glutamic acid (Glu) and increasing porosity by poly(ethylene glycol) (PEG). The morphology of the obtained membranes was investigated through SEM. The structure of the membranes was characterized by FTIR. The XRD analysis was used to determine the crystallinity index, and its changes were further confirmed by DSC analysis and the Swelling degree. The improvement of water stability was verified through Swelling degree and Gel content measurement. The membrane’s adsorption performance was evaluated in copper (II) sulfate solutions. The optimal adsorption conditions for the obtained membranes were determined as a function of pH, temperature, adsorbent dose, initial concentration, and contact time. Under the optimum conditions, the adsorption capacity (Qe) reached the maximum value of 51.96 mg/g, approximately 10 times higher than that of the parent PVA membrane.