Ultrasound effects on zeolite synthesis from fly ash. A mini review

In this short review, effects of ultrasound treatment on the synthesis of zeolite from fly ash are analyzed. Zeolites can be synthesized using various processes and among these, because of reducing incubation time, the application of ultrasound treatment has been received great attention in the last few years. Moreover, literature data indicate that sonication also improves crystallinity of the synthesized zeolites. The most important mechanism enhancing crystallization is the ultrasonic cavitation, i.e., the growth and explosive collapse of microscopic bubbles.