Airwatch provides a handy way for teachers to send out websites to iOS devices. What is especially nice, is that it automatically appears on a student's device appearing to be an app. You also have the ability to upload your own icon. You may want to have your own image ready to go to match the website you want your students to use. Lastly, you can set a time limit to your webclip. If you want it to disappear after a few days, you simply do that through the use of a calendar on Airwatch.
I created some directions on how to make a webclip.