Actually this is really old effect and really favorite of beginners coz it looks really cool. You can create many different variation of this photo effect and i chose to use brushes that allowed to create feeling of dust particles.
Most important thing in this photoshop effect is the selection of the correct brush set. you can spend hours trying to re create proper disintegration but it will not work, no matter how hard you try.
so i hope you learn something from this tutorial, have a good day 🙂