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.