Difference between single and dual rail op-amp
It is convenient in many applications to have a voltage reference point somewhere between the most positive rail and the most negative rail. This is usually called 0V. 

0V can come from the power supply and feed to the op-amp circuit or, 0V can be "constructed" by using a potential divider and maybe another op-amp to produce a "mid-rail" signal. You can also generate a negative supply from a positive supply.

All op-amps that operate in linear circuits have to be "biased" somewhere in between the two power rails and this means either the input itself contains that bias naturally OR you have dual supplies OR you manufacture a mid-rail or negative rail. By "bias" I mean they have a dc operating point that is not end-stopped against the rails.

The upshot of what I'm trying to say is that op-amps don't care how you do this and if the data sheet specifies dual rail then a single rail of twice the voltage will be fine. I'm not saying this rule applies 100% because that would be stupid BUT I can't think of one so-called dual-rail op-amp that cannot work with a manufactured mid-rail.