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<p>Membrane technologies face a persistent trade off between water permeability and selective ion removal, which limits their efficiency in heavy metal remediation. This work presents the development of dendritic mesoporous silica nanoparticles (DMSNs) functionalized with a zwitterionic polymer for water purification. Cysteine methacrylate monomer was synthesized via thiol-Michael addition and subsequently polymerized onto the surface of DMSNs using atom transfer radical polymerization (ATRP), yielding particles with an average diameter of ~ 162&#xa0;nm. The materials were characterized using SEM, TEM, FT-IR, TGA, and DLS. Adsorption studies for Pb²⁺ and Cd²⁺ ions were conducted under varying pH levels and concentrations, demonstrating enhanced uptake capacity at higher concentrations. Composite membranes were fabricated by incorporating chitosan-modified DMSNs and DMSNs-PCysMA into a polysulfone matrix. These membranes were characterized and evaluated for water flux and salt rejection, with the DMSNs-PCysMA@CHIT membrane exhibiting superior water permeability. Heavy metal removal performance (Cr³⁺, Cu²⁺, Cd²⁺, and Pb²⁺) was assessed using a cross-flow filtration system under varying pressures. All membranes demonstrated high removal efficiencies ranging from 85% to 99%.</p>

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Zwitterionic poly (amino acid methacrylate) brushes functionalized dendritic mesoporous silica nanoparticles in layer-by-layer assembled membranes for selective Ion separation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月1日

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  • Hadeel Albarrak,
  • Ahmed A. Alshahrani,
  • Hessa H. Al-Rasheed,
  • Khalid M. Alotaibi,
  • Abdullah Alswieleh

摘要

Membrane technologies face a persistent trade off between water permeability and selective ion removal, which limits their efficiency in heavy metal remediation. This work presents the development of dendritic mesoporous silica nanoparticles (DMSNs) functionalized with a zwitterionic polymer for water purification. Cysteine methacrylate monomer was synthesized via thiol-Michael addition and subsequently polymerized onto the surface of DMSNs using atom transfer radical polymerization (ATRP), yielding particles with an average diameter of ~ 162 nm. The materials were characterized using SEM, TEM, FT-IR, TGA, and DLS. Adsorption studies for Pb²⁺ and Cd²⁺ ions were conducted under varying pH levels and concentrations, demonstrating enhanced uptake capacity at higher concentrations. Composite membranes were fabricated by incorporating chitosan-modified DMSNs and DMSNs-PCysMA into a polysulfone matrix. These membranes were characterized and evaluated for water flux and salt rejection, with the DMSNs-PCysMA@CHIT membrane exhibiting superior water permeability. Heavy metal removal performance (Cr³⁺, Cu²⁺, Cd²⁺, and Pb²⁺) was assessed using a cross-flow filtration system under varying pressures. All membranes demonstrated high removal efficiencies ranging from 85% to 99%.