iPad will not charge
There are 3 kind of USB hubs.


Unpowered


Non-powered, or passive, USB hubs do not have an external power source and only pull power from the computer's USB port, limiting the maximum power to single USB (splitting).


Powered 


Powered, or active, USB hubs use an external power source to bring each hub port to the same energy level as an on-system port, but not to charge them.


Powered with Charge capability


mostly have one (or more) of the USB ports capable of charging devices