Can you still use the Canoscan 9000F from Canon with macOS Mojave?
Yes, the scanner can still be accessed via the on-board resources of macOS. Unfortunately the scan software from Canon is no longer compatible with the operating system. This software takes over among other things the conversion of negatives and can directly remove dust from the images.
But the Canoscan 9000F can be used with third party software, as Vuescan.