I’ve seen the word “purge” used in conjunction with “of” and “from” or being used on its own. However, would it be appropriate to say something like “I purged the information out from my brain?"
Here is a definition of this meaning of purge from the Oxford dictionary.
Rid (someone) of an unwanted feeling, memory, or condition
Here are two examples of the usage of purge from the Cambridge dictionary:
Party leaders have undertaken to purge the party of extremists.
Hard-liners are expected to be purged from the administration.
of denotes what you are getting rid of, and from denotes where you are taking it from. You could therefore express yourself as follows:
I purged the information from my brain.
I purged my brain of the information.
Note that the word out is not required in either sentence and its usage would sound uneducated.
I purged the information out from my brain
Yup this is correct.
You can also say:
A) I purged my brain of information
B) I purged the information from my brain
They all mean the same thing.
A emphasises purging your brain. B emphasises purging the information.
Your original sentence, 'out' is not necessary but it is not incorrect. It just emphasises that the information came out.
Purge verb (used with object):
to remove by cleansing or purifying (often followed by away, off, or out
Dictionary.com (Taken from Random House Dictionary)
Purge means "to remove all unneeded/unwanted items" or "to make empty."
Purge is weird because it takes an object, but that object can be the thing X needing items Y removed, or it can be the items Y that need to be removed from X.
Of and from allow us to tell which is which.
I purged the file of old data. (We're removing old data from the file.)
I purged old data from the file. (We're still removing old data from the file.)
However, would it be appropriate to say something like “I purged the information out from my brain?"
Out isn't technically needed since purge already means "to remove", which means the unwanted items will be outside of what they are removed from already, but it can be there for emphasis if desired. By emphasizing, you are creating the impression that it took much effort to purge the information from your brain, for example.