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<p>Volatile organic compounds (VOCs), such as benzene, toluene, ethylbenzene, and xylene (BTEX), are significant contributors to air pollution, smog formation, and health risks, including respiratory ailments and cancer. This study introduces an innovative ultrasonic-assisted dealumination method to enhance the VOCs adsorption capacity and moisture resistance of Y zeolites. Dealuminated Y (DAY) zeolites were prepared via steaming and acid treatment, with ultrasonic irradiation applied during acid leaching at 25&#xa0;°C to optimize aluminum removal. The resulting zeolites were characterized for their Si/Al ratio, crystal structure, pore properties, and adsorption performance under varying humidity levels. Compared to conventional acid treatment at 95&#xa0;°C, the ultrasonic-assisted approach significantly improved dealumination efficiency, yielding adsorption capacities of 60.39, 113.12, 129.68, and 98.98&#xa0;mg/g for benzene, toluene, ethylbenzene, and xylene, respectively. At 50% relative humidity, the DAY zeolite achieved a toluene adsorption capacity of 63&#xa0;mg/g, with a breakthrough time extended to 845&#xa0;s, highlighting its superior hydrophobicity and adsorption efficiency. This low-temperature technique offers a promising, energy-efficient strategy for developing high-performance hydrophobic zeolites for industrial VOCs abatement.</p> Graphical Abstract <p></p>

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Ultrasonic-Assisted Dealumination of Y Zeolite for Improving VOCs Adsorption and Moisture Resistance

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Younghee Jang,
  • Sung Su Kim,
  • D. Duc Nguyen

摘要

Volatile organic compounds (VOCs), such as benzene, toluene, ethylbenzene, and xylene (BTEX), are significant contributors to air pollution, smog formation, and health risks, including respiratory ailments and cancer. This study introduces an innovative ultrasonic-assisted dealumination method to enhance the VOCs adsorption capacity and moisture resistance of Y zeolites. Dealuminated Y (DAY) zeolites were prepared via steaming and acid treatment, with ultrasonic irradiation applied during acid leaching at 25 °C to optimize aluminum removal. The resulting zeolites were characterized for their Si/Al ratio, crystal structure, pore properties, and adsorption performance under varying humidity levels. Compared to conventional acid treatment at 95 °C, the ultrasonic-assisted approach significantly improved dealumination efficiency, yielding adsorption capacities of 60.39, 113.12, 129.68, and 98.98 mg/g for benzene, toluene, ethylbenzene, and xylene, respectively. At 50% relative humidity, the DAY zeolite achieved a toluene adsorption capacity of 63 mg/g, with a breakthrough time extended to 845 s, highlighting its superior hydrophobicity and adsorption efficiency. This low-temperature technique offers a promising, energy-efficient strategy for developing high-performance hydrophobic zeolites for industrial VOCs abatement.

Graphical Abstract