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<p>This work investigates the potential of a metakaolin-based geopolymer paste supplemented with PVA fibers, TiO<sub>2</sub> and ZnO nanocomposites, to stabilize hazardous Cr (VI) waste. The study examines the effects of varying concentrations of these additives on the mechanical, chemical, and physical characteristics of the geopolymer, focusing on its microstructure, compressive strength, and ability to bind Cr (VI). Tests such as XRD, FTIR, TGA, and SEM demonstrate that the proper concentration of nano-ZnO significantly increases compressive strength and the degree of geopolymerization. It also facilitates the immobilization of Cr (VI), achieving up to 99% efficiency. This improvement is attributed to the synergistic actions of PVA and nano-ZnO, which lower porosity and form a barrier that is impermeable to water in the geopolymer matrix. On the other hand, nano-TiO<sub>2</sub> has a less noticeable effect on Cr (VI) immobilization even if it also improves geopolymerization. According to this study, removing Cr (VI) waste from metakaolin geopolymer composites including certain nano-ZnO and PVA mixes may be a durable and efficient solution that improves environmental quality and safeguards public health.</p>

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Evaluation of TiO2 and ZnO nanocomposites based Metakaolin geopolymer composites on immobilization of cr (IV) complexes for progressing towards sustainability

  • 期刊论文

  • 发表日期：

    2025年12月21日

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  • Ramadan Abbas,
  • M. A. Abdelzaher,
  • Nabila Shehata,
  • M. A. Tantawy

摘要

This work investigates the potential of a metakaolin-based geopolymer paste supplemented with PVA fibers, TiO2 and ZnO nanocomposites, to stabilize hazardous Cr (VI) waste. The study examines the effects of varying concentrations of these additives on the mechanical, chemical, and physical characteristics of the geopolymer, focusing on its microstructure, compressive strength, and ability to bind Cr (VI). Tests such as XRD, FTIR, TGA, and SEM demonstrate that the proper concentration of nano-ZnO significantly increases compressive strength and the degree of geopolymerization. It also facilitates the immobilization of Cr (VI), achieving up to 99% efficiency. This improvement is attributed to the synergistic actions of PVA and nano-ZnO, which lower porosity and form a barrier that is impermeable to water in the geopolymer matrix. On the other hand, nano-TiO2 has a less noticeable effect on Cr (VI) immobilization even if it also improves geopolymerization. According to this study, removing Cr (VI) waste from metakaolin geopolymer composites including certain nano-ZnO and PVA mixes may be a durable and efficient solution that improves environmental quality and safeguards public health.