Opamp driving a capacitive filter load
It's a bit unclear, but you want a signal that is the rectified voltage into the IC, you're not trying to power the IC from the opamp, right?  If the latter, there are much better ways to do that, like with a voltage regulator chip.

Instead of putting the filter after the opamp, put it before the opamp.  At least put most of it there.  You can put a little filtering after the opmap if you're worried about slight noise introduced by the voltage follower opamp.

Of course "filtering" is with respect to some other signal, usually ground.  You don't show what you consider ground, and what the ground or reference voltage for the IC is.  You may also have to attenuate the rectified signal.  Unless the IC is running from 15 V or can specifically handle the large input voltage, you can't just feed that directly into it.  Mostly likely you have to attenuate the signal into the voltage range of the IC power.