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<p>Diatomaceous earth is widely used due to its porous structure, cost-effectiveness, abundant supply, and eco-friendly properties. While current applications require high-temperature treatment, geopolymerization can produce diatomite-based geopolymers at low temperatures, encouraging net zero emissions and sustainable growth. In this study, the method of fabricating geopolymer materials from diatomite with high SiO<sub>2</sub> content with active alkaline solution from 10M NaOH mixed with sodium silicate hydrothermally treated at 180&#xa0;°C for 10 h is presented. The synthesized diatomite-based geopolymers show the volumetric density spanning from 0.54 to 0.60 g cm<sup>−3</sup> and the thermal conductivity of 0.141 W/mK. Structural properties were studied by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM) methods that showed the formation of geopolymer material. The use of hydrothermal conditions in the production of diatomite-based geopolymer presents a promising method for fabricating porous, lightweight materials. Furthermore, diatomite-based geopolymers show potential as lightweight and thermal insulation materials for building applications.</p>

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Synthesis and characterization of lightweight geopolymer materials from rich-silica diatomaceous earth curing under hydrothermal conditions

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • Do Quang Minh,
  • Phan Nu Ngoc Yen,
  • Nguyen Vu Uyen Nhi,
  • Le Nguyen Gia Hieu,
  • Thach Khac Bui

摘要

Diatomaceous earth is widely used due to its porous structure, cost-effectiveness, abundant supply, and eco-friendly properties. While current applications require high-temperature treatment, geopolymerization can produce diatomite-based geopolymers at low temperatures, encouraging net zero emissions and sustainable growth. In this study, the method of fabricating geopolymer materials from diatomite with high SiO2 content with active alkaline solution from 10M NaOH mixed with sodium silicate hydrothermally treated at 180 °C for 10 h is presented. The synthesized diatomite-based geopolymers show the volumetric density spanning from 0.54 to 0.60 g cm−3 and the thermal conductivity of 0.141 W/mK. Structural properties were studied by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM) methods that showed the formation of geopolymer material. The use of hydrothermal conditions in the production of diatomite-based geopolymer presents a promising method for fabricating porous, lightweight materials. Furthermore, diatomite-based geopolymers show potential as lightweight and thermal insulation materials for building applications.