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Abstract <p>For the purpose of developing a potential process to remove Fe ions in steel industry wastewater, Fe–tobermorite has been prepared from coal fly ash and steel industrial wastewater by convenient hydrothermal method. The morphological changes and phase evolution during fabrication indicate that more crystallized Fe–tobermorite can be achieved during 10-h treatment at 220&#xa0;°C in this system. The effect of the sodium hydroxide concentration and Fe/Si ratio on phase constituents, microstructure and solidification effectiveness was characterized in detail. With the introduction of 20-g/L NaOH, mutually interwoven tobermorite/ Fe–tobermorite fibers can be synthesized successfully. The X-ray diffraction results revealed that the molecular ratio of ferrous to silicon of 1:2 could contribute to improving the safety of the solidification. The formation mechanism of layered Fe–tobermorite has been revealed by high-resolution transmission electron microscopy and differential thermal analysis. Environmental benign utilization of&#xa0;coal fly&#xa0;ash&#xa0;for solidifying heavy metal ions in steel industry wastewater treatment can alleviate environmental problems.</p> Graphical Abstract <p></p>

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Efficient Removal of Fe from Iron-Containing Wastewater by Fe–Tobermorite Prepared with Coal Fly Ash

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Kaixin Zhang,
  • Wei Wang,
  • Guoling Zhang

摘要

Abstract

For the purpose of developing a potential process to remove Fe ions in steel industry wastewater, Fe–tobermorite has been prepared from coal fly ash and steel industrial wastewater by convenient hydrothermal method. The morphological changes and phase evolution during fabrication indicate that more crystallized Fe–tobermorite can be achieved during 10-h treatment at 220 °C in this system. The effect of the sodium hydroxide concentration and Fe/Si ratio on phase constituents, microstructure and solidification effectiveness was characterized in detail. With the introduction of 20-g/L NaOH, mutually interwoven tobermorite/ Fe–tobermorite fibers can be synthesized successfully. The X-ray diffraction results revealed that the molecular ratio of ferrous to silicon of 1:2 could contribute to improving the safety of the solidification. The formation mechanism of layered Fe–tobermorite has been revealed by high-resolution transmission electron microscopy and differential thermal analysis. Environmental benign utilization of coal fly ash for solidifying heavy metal ions in steel industry wastewater treatment can alleviate environmental problems.

Graphical Abstract