Password Protect AirPrint

I was recently hired as an IT supporter on a school for kids with autism and other development issues. They utilize iPads and I have no experience with Apple products. Now, today a teacher came to me asking if I could block access to the printers from the kids iPads. They are printing some rather unfortunate things, and from a brief googling, I couldn't seem to find any option to do so, apart from setting up a seperate network (not a possibility (the teachers use iPads as well, and they need to be able to print. All tablets are connected to the same network.)) Is there a way to do it from the iPad, or do I have to setup passwords on the printers?