Quote from allinsider on , 9:44 am

Below are the steps to delete Facebook business profile from iOS device:-

1. Launch Facebook, then tap the Menu icon in the bottom right corner. 
2. Select your business page through the drop-down list. 
3. Select the page that you want to delete, tap the Settings icon in the top right corner, and then locate Page Settings > Access and Control > Deactivate and Delete. 
4. Select Delete Page and hit Continue. Choose your reason for deletion and continue. 
5. Download or transfer your page data if necessary. 
6. Enter your password, confirm your choice, and click Delete Page to finish.

Read More:- https://allinsider.net/how-to-delete-facebook-business-page/