Hyperbranched Polyethylenimine-Tethered Multiple Emulsion-Templated Hierarchically Macroporous Poly(acrylic acid)–Al2O3 Nanocomposite Beads for Water Purification
Autor: | Haifei Zhang, Irshad Hussain, Muhammad Ahmad Mudassir, Tariq Mahmood Ansari, Shazia Kousar, Syed Zajif Hussain |
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Rok vydání: | 2021 |
Předmět: |
chemistry.chemical_classification
Polyethylenimine Nanocomposite Materials science technology industry and agriculture Nanoparticle Portable water purification 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Emulsion Surface modification General Materials Science 0210 nano-technology Acrylic acid |
Zdroj: | ACS Applied Materials & Interfaces. 13:27400-27410 |
ISSN: | 1944-8252 1944-8244 |
Popis: | Emulsion template-guided strategy has been used to produce porous architectures with exquisite structure, tailored morphology, and exclusive features for ubiquitous applications. Notwithstanding, the practical water remediation is often marred by their transport-limited behavior and fragility. To circumvent these conundrums, we prepared hierarchically porous poly(acrylic acid)-alumina nanocomposite beads by solidifying the droplets of emulsions jointly stabilized by the organic surfactants and alumina nanoparticles. By virtue of their positive charge, the alumina nanoparticles got entrapped within the poly(acrylic acid) scaffolds that excluded the risk of secondary contamination typically observed with conventional nanocomposites. Being amenable to surface modification, the carboxyl moieties of the beaded polymer were further exploited to covalently tether branched polyethylenimine throughout the exterior and interior surface of the porous matrix via a grafting-to approach. The macropores expedite an active fluid flow and easier adsorbate transport throughout the functionalized nanocomposites whose overall higher density of positive charge over a certain pH range electrostatically attracts and effectively adsorbs the negatively charged Cr(VI) complexes and anionic congo red ions/molecules from water. This proof-of-concept synthetic approach and postsynthetic modification offer an improved mechanical robustness to these macrosized multifunctional nanocomposite beads for their easier processing, thereby paving the way for the point-of-use water purification technology development. |
Databáze: | OpenAIRE |
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