The Boehm titration of ZnCl2 activated carbon indicated basic sites of 0.525 mmol/g and 0.85 mmol/g phenolic groups with -0.19 mmol/g and -0.26 mmol/g lactonic and carboxylic groups. The total acid groups present is 0.4 mmol/g. The ZPC of this carbon was found to be 6.71. So, what does the negative value of functional group signifies? What is the relation between zero point charge and boehm titration?
The Boehm titration results would be meaningful, if and only if, the carbonaceous material is thoroughly clean. I know there are lot of papers for the sake of publication on ZnCl2 activation, I don't think zinc does anything to carbon or it creates more activation sites. One has to ensure that zinc has been cleaned, and it leaves no traces. Make sure your material does not leach anything, and after treatment it has been washed well with acids, bases followed by deionized water.
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