zeolites with a low Si/Al ratio hav

zeolites with a low Si/Al ratio have a higher ion exchange capacity andmainly been used as a reservoir and release system of ions. Zeoliteswith a high Si/Al ratio have stronger solid acidity, are more hydrophobic in their adsorption properties and more stable in acidic conditions. From the point of view of providing support for Fenton catalyst, ion exchange capacity, stability and adsorption properties for organic compounds are both important requirements.
The NaY zeolite (Si/Al ratio 2.8) used herein has a threedimensional micropore structure, the large supercage of 1.2 nm and relatively small open window of 0.7 nm. This particular zeolite not only has favorable properties for ion exchange and immobility but also is highly resistant to change in properties when exposed to an acidic environment [21,22]. Consequently, considering the overall performance, it is an appropriate support for Fenton catalysts.