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<p>Water pollution is a growing concern, particularly hexavalent chromium, a toxic pollutant that poses serious environmental and health risks due to its persistence and bioaccumulation. In this study, zeolite A–X was synthesized using an ultrasonic-alkali fusion hydrothermal method, with coal fly ash serving as the source of silica and aluminum, to treat chromium-containing wastewater. The zeolite A–X was successfully synthesized at an alkali-to-ash ratio of 1.5, a hydrothermal temperature of 90&#xa0;°C, and a hydrothermal time of 12&#xa0;h. Batch adsorption experiments showed that zeolite A–X achieved optimal adsorption of Cr (VI) at 13.73&#xa0;mg&#xa0;g<sup>−1</sup> under a pH of 3.</p>

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Synthesis of Zeolite A–X from Coal Fly Ash via Ultrasonic-Alkali Fusion Hydrothermal Method for the Efficient Removal of Cr (VI) From Wastewater

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Xiaohui Xu,
  • Kaige Chen,
  • Yong Dai,
  • Xiaoping Xing,
  • Lin Sun

摘要

Water pollution is a growing concern, particularly hexavalent chromium, a toxic pollutant that poses serious environmental and health risks due to its persistence and bioaccumulation. In this study, zeolite A–X was synthesized using an ultrasonic-alkali fusion hydrothermal method, with coal fly ash serving as the source of silica and aluminum, to treat chromium-containing wastewater. The zeolite A–X was successfully synthesized at an alkali-to-ash ratio of 1.5, a hydrothermal temperature of 90 °C, and a hydrothermal time of 12 h. Batch adsorption experiments showed that zeolite A–X achieved optimal adsorption of Cr (VI) at 13.73 mg g−1 under a pH of 3.