[Terrapreta] Char sorption of water.

[Gerald Van Koeverden]

Brian

I'll try it to-night with some of pyrolytic char for a comparison.

I'd like you to try this second experiment:  Fill a bottle half full  
of char, add lots of water, cap it air-tight, and shake.  Listen when  
you take the cap off, you'll hear a "whoosh," and the container is  
slightly warmer.  There must be an oxidizing reaction which happened,  
right?

Now take this wet char and dry it.  Now wet it again and observe  
where originally the fresh char wouldn't suck up water, this water- 
conditioned char will suck it up readily.  Somehow the first mixing  
(oxidation?) has neutralized enough of the charges (some of those  
free carbon ions from which all the hyrdrogen and oxygen had been  
driven off by heat?) on fresh char.

Of course, since your charcoal (HTP?) is made very differently, you  
probably won't get a "whoosh."

(Please forgive me.  As is obvious, I didn't study more than first  
year chemistry, but I can't resist guessing.)

Gerrit

On 6-Mar-08, at 5:23 PM, Brian Hans wrote:

> Im looking for a bit of help.
>
> Some of you with access to char, could you run a simple experiment  
> and offer some results?
>
> Putting a fixed amount of charcoal in a vessel, add water until it  
> doesnt pour out of the vessel anymore and record that sorption #.
>
> An example is that I put in 10g of material into a glass and  
> started adding water until it couldnt uptake it anymore. I then  
> poured out the excess water from the glass and recorded the amount  
> of uptake. In this case, I got ~225% weight uptake.
> Im looking for some others results to compare my material with...
>
> FYI perlite = 200-600%
>
> Thanks for the inputs!
> Brian
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